RADIATION HEAT EXCHANGE DEVICE WITH SUB-NEAR FIELD GAP

Abstract

A radiation heat exchange device serving as a modular unit includes a first metal radiant plate, and a second metal radiant plate spaced apart from the first metal radiant plate to define a sub-near field gap between the first metal radiant plate and the second metal radiant. The first metal radiant plate is heat-exchanged with the second metal radiant plate through the gap to regulate a temperature of the first metal radiant plate for regulating a temperature of an environment to be temperature-regulated.

Claims

1. A radiation heat exchange device for a heat exchanging system, comprising: a first metal radiant plate defining a first radiation heat exchange zone, and having a first plate surface for communicating with an environment to be temperature-regulated, and an opposed plate surface; and a second metal radiant plate having a first plate surface facing toward said second plate surface of said first metal radiant plate and an opposed second plate surface facing away of said first metal radiant plate, wherein said second metal radiant plate is spaced apart from said first metal radiant plate to define a sub-near field gap between said second plate surface of said first metal radiant plate and said first plate surface of said second metal radiant and within said first radiation heat exchange zone of said first metal radiant plate, such that said first metal radiant plate is heat-exchanged with said second metal radiant plate through said sub-near field gap to regulate a temperature of said first plate surface of said first metal radiant plate for regulating a temperature of the environment to be temperature-regulated.

2. The radiation heat exchange device, as recited in claim 1, wherein a minimum width of said sub-near field gap, which is a minimum distance between said first metal radiant plate and said second metal radiant, is 2 mm.

3. The radiation heat exchange device, as recited in claim 1, wherein a minimum width of said sub-near field gap, which is a minimum distance between said first metal radiant plate and said second metal radiant, is set between 1 mm and 3 mm.

4. The radiation heat exchange device, as recited in claim 1, further comprising an isolation element mounted on said second plate surface of said first metal radiant plate at said first radiation heat exchange zone of said first metal radiant plate, wherein said sub-near field gap is formed by a thickness of said isolation element.

5. The radiation heat exchange device, as recited in claim 4, wherein said isolation element is made of low thermal conductive material and has a mesh structure for providing spaces to heat exchange between said first metal radiant plate and said second metal radiant plate.

6. The radiation heat exchange device, as recited in claim 4, wherein said isolation element is an isolation net defining said mesh structure thereat.

7. The radiation heat exchange device, as recited in claim 1, further comprising a heat exchanging channel for guiding a heat exchange medium being flow therealong, wherein said second metal radiant plate is thermally contacted with said heat exchanging channel to form a heat exchange core plate assembly being heat exchanged with said first metal radiant plate through said sub-near field gap when the heat exchange medium flows along said heat exchanging channel.

8. The radiation heat exchange device, as recited in claim 5, further comprising a heat exchanging channel for guiding a heat exchange medium being flow therealong, wherein said second metal radiant plate is thermally contacted with said heat exchanging channel to form a heat exchange core plate assembly being heat exchanged with said first metal radiant plate through said sub-near field gap when the heat exchange medium flows along said heat exchanging channel.

9. The radiation heat exchange device, as recited in claim 8, wherein said second metal radiant plate has a first indentation groove formed thereon, wherein said heat exchanging channel is disposed at said first indentation groove to closely contact and thermally conduct said heat exchanging channel with said first indentation groove, wherein said first indentation groove is indented on said second metal radiant plate to tangentially contact with said isolation element so as to thermally conduct the second metal radiant plate with said first metal radiant plate through said mesh structure of said isolation element.

10. The radiation heat exchange device, as recited in claim 9, further comprising at least one coil bracket having a second indention groove, wherein said coil bracket is coupled on said second plate surface of said second metal radiant plate at a position that said second indention groove is aligned with and extended along with said first indention groove to form an accommodating channel to receive and retain said heat exchanging channel.

11. The radiation heat exchange device, as recited in claim 10, wherein said coil bracket is an elongated arc-shaped strip made of high thermal conductive material, such that said coil bracket not only retains said heat exchanging channel on said second metal radiant plate but also thermal conducts with both said heat exchanging channel and said second metal radiant plate.

12. The radiation heat exchange device, as recited in claim 11, wherein said heat exchanging channel is configured as a heat exchanging coil having a plurality of straight pipe portions parallel with each other and a plurality U-shaped curved pipe portions, wherein two ends of each of said curved pipe portions are communicatively connected to two ends of two of said straight pipe portions respectively, wherein said coil bracket is coupled on each of said straight pipe portions of said heat exchanging channel respectively.

13. The radiation heat exchange device, as recited in claim 12, wherein said straight pipe portions of said heat exchanging channel are thermally contacted with said second metal radiant plate and are disposed at said first indention grooves of said second metal radiant plate respectively, wherein said curved pipe portions of said heat exchanging channel are extended out of two opposed edges of said second metal radiant plate.

14. The radiation heat exchange device, as recited in claim 8, further comprising a first radiation enhancing coating coated on said second plate surface of said first metal radiant plate at a position that said heat radiation enhancing coating said is sandwiched between said second plate surface of said first metal radiant plate and said isolation element.

15. The radiation heat exchange device, as recited in claim 14, further comprising a second radiation enhancing coating coated on said first plate surface of said second metal radiant plate.

16. The radiation heat exchange device, as recited in claim 8, further comprising a thermal insulation element on said second plate surface of said first metal radiant plate, wherein said second metal radiant plate and said first radiation heat exchange zone of said first metal radiant plate are enclosed by said thermal insulation element.

17. The radiation heat exchange device, as recited in claim 16, further comprising an outer casing, having an outer reflective surface, mounted on said second plate surface of said first metal radiant plate to enclose said thermal insulation element, wherein said outer casing is configured for protecting said thermal insulation element from being damaged by an external force and for reflecting an external thermal radiation energy by said outer reflective surface of said outer casing.

18. The radiation heat exchange device, as recited in claim 17, wherein said outer casing has two through slots formed thereat for two opening ends of said heat exchanging channel being extended out of said outer casing through the through slots respectively, wherein said outer casing further comprises two sealing rings mounted at said through slots and sleeved on said heat exchanging channel where said heat exchanging channel is extended out of said outer casing.

19. The radiation heat exchange device, as recited in claim 1, wherein said first radiant metal plate and said second radiant metal plate are parallel with each other.

20. The radiation heat exchange device, as recited in claim 1, wherein said first radiant metal plate and said second radiant metal plate are two aluminum plates.

21. A radiation heat-exchanging ceiling plate arranged to install on a false ceiling for an air conditioning system, comprising: a metal ceiling plate having a bottom side and a peripheral side defining a receiving cavity and an opening; a heat-exchanging coil mounted onto said bottom side of said metal ceiling plate inside said receiving cavity by a plurality of coil brackets and has two ends extending outward at said peripheral side of said metal ceiling plate, wherein said heat-exchanging coil is directly supported by said metal ceiling plate and not directly contacting said metal ceiling plate to prevent direct heat conduction between said heat-exchanging coil and said metal ceiling plate, said coil brackets has a heat transfer coefficient around 0.2-0.3 W/(mK) serving as insulating spacer to prevent substantive heat conduction between said coil brackets and said heat-exchanging coil, said heat-exchanging coil is maintained at a preset distance from said metal ceiling plate and a gap is formed between said heat-exchanging coil and said metal ceiling plate to allow effective radiation between said heat-exchanging coil and said metal ceiling plate; a layer of thermal insulation material on a top of said heat-exchanging coil serving as a thermal barrier; a layer of metal foil placed between said heat-exchanging coil and said layer of thermal insulation material for promoting heat transfer by radiation, and a sealing layer being installed on a top of said layer of thermal insulation material to seal said opening of said metal ceiling plate and blocking air movement between said heat-exchanging coil and outside, wherein said heat-exchanging coil is sealed inside said receiving cavity through said sealing layer and said metal ceiling plate against water moisture, thereby hot and cold spots caused by heat conduction between said heat-exchanging coil and other parts of said radiation heat-exchanging ceiling plate are effectively eliminated, thereby dewing can be avoid as uneven hot and cold spots are eliminated while water moisture is blocked from reaching said heat-exchanging coil.

22. The radiation heat-exchanging ceiling plate according to claim 21, comprising: a plurality of sealing strips sealing between edges of said sealing layer and edges of said metal ceiling plate to shield said heat-exchanging coil against water moisture, wherein said metal ceiling plate, said coil brackets, said heat-exchanging coil, said layer of metal foil, said layer of thermal insulation material, said sealing layer and said sealing strip form a one-piece modular structure with said two ends of said heat-exchanging coil extending outside said one-piece modular structure.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0054] FIG. 1 is an explosive view of the radiation heat-exchanging ceiling according to one embodiment of the present invention;

[0055] FIG. 2 is a diagrammatic sketch showing the structure of the radiation heat-exchanging ceiling according to one embodiment of the present invention;

[0056] FIG. 3 is a schematic flowchart of the direct-cooling air conditioning system according to one embodiment of the present invention.

[0057] FIG. 4 is a schematic diagram showing the radiation heat-exchanging ceiling plate of the present invention being applied on a false ceiling.

[0058] FIG. 5 is a perspective view of a radiation heat exchange device with a sub-near field gap according to a second embodiment of the present invention.

[0059] FIG. 6 is an exploded perspective view of the radiation heat exchange device with the sub-near field gap according to the second embodiment of the present invention.

[0060] FIG. 7 is a partially sectional view of the radiation heat exchange device with the sub-near field gap according to the second embodiment of the present invention.

[0061] FIG. 8 is a sectional view of the radiation heat exchange device with the sub-near field gap according to the second embodiment of the present invention, illustrating the assembly of a first radiant metal plate and a heat exchange core plate.

[0062] The numerals in the drawing represent respectively: 1 metal ceiling plate, 2 heat-exchanging coil, 3 glass wool layer, 4 coil brackets, 5 aluminum foil, 6 sealing layer, 7 heat pump system, 8 water-circulation system, 9 pump, 10 air heat-exchanging device, 11 water heat-exchanging device, 12 fresh flue, 13 fan, 14 inlet, 15 outlet, 16 heat-exchanging coil for fresh air, 17 heat pump, 18 throttling elements (such as capillary or expansion valve), 19 sealing strips, and 20 a plurality of radiation heat-exchanging ceiling plates in each room.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0063] One of embodiments of the radiation heat-exchanging ceiling plate of the present invention is shown in FIG. 1 and FIG. 2, including a metal ceiling plate 1 and a radiation heat-exchanging coil 2 in which the heat-exchanging coil 2 is placed on the top of the metal ceiling plate 1. The heat-exchanging coil 2 is adjacent to but do not contact with the metal ceiling plate 1. A layer of glass wool 3 covers on the top of the heat-exchanging coil 2. The upper surface of the metal ceiling plate 1 is equipped with coil brackets 4. The coil brackets 4 are made from poor thermal conducting material which serve as an insulating spacer, and the heat-exchanging coil 2 is installed on the coil brackets 4.

[0064] Preferably, the coil bracket 4 connects the heat-exchanging coil 2 to the metal ceiling plate 1 without directly contact with the metal ceiling plate 1. The coil bracket 4 has a low thermal conductivity so that the heat-exchanging coil 2 is maintained at a preset distance from the metal ceiling plate 1 and a gap is formed between the heat-exchanging coil 2 and the metal ceiling plate 1. In particular, the coil bracket 4 has a high strength and small heat transfer coefficient, generally around 0.2-0.3 W/(m.Math.K). A layer of aluminum foil 5 locates under the layer of glass wool 3. The aluminum foil 5 is positioned between the heat-exchanging coil 2 and the layer of glass wool 3. There is also a sealing layer 6 on the top of the layer of glass wool 3. The sealing layer 6 covers on the layer of glass wool 3 so as to isolate it from the outside air. The aluminum foil 5 can also be replaced by a copper foil, and the layer of glass wool 3 can be replaced by another insulation material. In other words, the glass wool 3 serves as a thermal insulation material for heat insulation. The heat-exchanging coil 2 is heat conduction insulated from the top to the bottom between the coil brackets 4 and the thermal insulation material 3. Then, the sealing layer 6 and the metal ceiling plate 1 forms an isolated sealing cavity, and any water or moisture exposure to the heat exchanging coil 2 can be shield by the sealing layer 6 and the metal ceiling plate 1. On the one hand, the direct heat transfer between the heat-exchanging coil and the metal ceiling plate through direct contact is eliminated, and the hot and cold spots in the metal ceiling plate is eliminated. On the other hand, the air or moisture is blocked by the metal ceiling plate 1 and the sealing layer 6. In the absence of hot and cold spots and in the absence of air or moisture, dew cannot be formed. Therefore, the problem of dewing, even in humid environment, can be effectively solved.

[0065] It is worth mentioning that since any direct contact or direct heat conduction between the heat-exchanging coil 2 and the metal ceiling plate 1 is eliminated, the gap between the bottom of the heat-exchanging coil 2 and the top of the ceiling plate 1 can allow effective heat exchange by radiation without creating any hot or cold spots. Preferably, the gap between the heat-exchanging coil 2 and the metal ceiling plate 1 is 1.8 mm to 2 mm.

[0066] Preferably, two layers of additional radiation-enhancing coating are provided for the metal ceiling plate 1 and the heat-exchanging coil 2 respectively to enhance radiation heat exchange.

[0067] As shown in FIG. 1 and FIG. 2 of the drawings, the radiation heat-exchanging ceiling plate has a main body 101 formed by the metal ceiling plate 1, the sealing layer 6 and the plurality of sealing strips 19. In particular, the metal ceiling plate 1 has a bottom side 1011 and a peripheral side 1012 transversely extended upward from the bottom side 1011 defining a receiving cavity 1013 and an opening 1014. The sealing layer 6 close the opening 1014 of the metal ceiling plate 1 and the sealing strips 19 seal the connecting portions between the sealing layer 6 and the metal ceiling plate 1. The heat-exchanging coil 2 is sealed inside the receiving cavity 1013 and has two ends 21, 22 extending outside from the main body 101 at two opposite ends of the peripheral side 1012 of the metal ceiling plate 1 for connecting to an inlet and an outlet of a heat exchanging medium respectively.

[0068] As shown in FIG. 2 of the drawings, the main body 101 has a rectangular structure. The bottom side 1011 of the metal ceiling plate 1 is rectangular shape with two long sides and two short sides, and the peripheral side is upwardly extended from the two long sides and two short sides of the bottom side 1011 of the metal ceiling plate 1. The sealing layer 6 matches the size of the opening 1014 to fittingly close the opening 1014. Four sealing strips 19 seal the connecting portions between the sealing layer 6 and the metal ceiling plate 1 at the edges of the peripheral side 1012 of the metal ceiling plate 1 and the edges of the sealing layer 6. The two ends 21, 22 of the heat-exchanging coil 2 extend outside from the main body 101 at two opposite ends of the peripheral side 1012 of the metal ceiling plate 1 for connecting to an inlet and an outlet of a heat exchanging medium respectively.

[0069] The radiation heat-exchanging ceiling plate as a whole is an integral unit and is arranged to install to a building structure.

[0070] For example, the radiation heat-exchanging ceiling plate can be installed on a false ceiling F of a building structure X. The radiation heat-exchanging ceiling plate can simply position onto the rectangular frame of the false ceiling through fitting the bottom side to the false ceiling.

[0071] In particular, as shown in FIG. 4 of the drawings, the false ceiling comprises a plurality of first frame members F2, a plurality of second frame members F4 perpendicularly aligned with the plurality of first frame members F2 to form a plurality of rectangular windows, a plurality of mounting members F6 mounting the false ceiling to the building structure X; and a plurality of metallic plate members F8 fittingly filled in the rectangular windows and supported by the first and second frame members. The radiation heat-exchanging ceiling plate of the present invention is arranged on top of the metallic plate member F8 of the false ceiling F.

[0072] It is worth mentioning that the radiation heat-exchanging ceiling plate is an enclosed structure with two ends of the heat-exchanging coil 2 extending outward. The radiation heat-exchanging ceiling plate can be installed to the false ceiling of the building structure easily through mounting means for the whole radiation heat-exchanging ceiling plate and is not a fixture of the building structure.

[0073] It is worth mentioning that the water temperature used in the heat-exchanging coil 4 can achieve 7/12° C., which cannot be reached by other conventional radiant panels which used water with water temperature of 16/19° C.

[0074] One of embodiments of the direct-cooling air conditioning system of the present invention is shown in FIG. 3, in which a radiation heat-exchanging ceiling is used. The direct-cooling air conditioning system includes a heat pump system 7 and a water circulation system 8 in which the water circulation system 8 further includes a water circulation loop comprising a circulation pump 9, an air heat-exchanging device 10, and a water heat-exchanging device 11. The air heat-exchanging device 10 exchanges heat with the outside air, and the water heat-exchanging device 11 exchanges heat with the heat pump system. The water circulation system 8 comprises a plurality of radiation heat-exchanging ceiling plates as shown in FIG. 1 with their heat-exchanging coils 2 being connected into the circulation loop of the water circulation system 8.

[0075] The above direct-cooling air conditioning system can further comprise a fresh flue 12 which is equipped with a fan 13. The inlet 14 of the fresh flue 12 is in communication with the outdoor air, and its outlet 15 is in communication with the indoor air. A heat-exchanging coil 16 for fresh air is placed within the fresh flue 12, and it is connected between the pump 9 and the heat-exchanging coils 2 of the radiation heat-exchanging ceiling plates. The water heat-exchanging device 11 can be a water tank for thermal buffering which is positioned between the pump 9 and the heat-exchanging coil 16 for fresh air. The evaporator coils of the heat pump system 7 are installed in the water tank for thermal buffering.

[0076] A solenoid valve can be equipped in the fresh flue 12, and a solenoid valve can also be placed between the pump 9 of the water circulation loop and the heat-exchanging coils 2 of the radiation heat-exchanging ceiling plates (not shown in the figures).

[0077] As another embodiment of the direct-cooling air conditioning system of the present invention the water circulation loop can have an additional water tank for thermal buffering.

[0078] Referring to FIGS. 4 to 8 of the drawings, a radiation heat exchange device according to a second embodiment of the present invention is illustrated, wherein the radiation heat exchange device can be used as the radiation heat exchanging ceiling plate of the first embodiment and is adapted for being for a heat exchanging system such as an air conditioning system. The radiation heat exchange device, according to the second embodiment, comprises a first metal radiant plate 100 and a second metal radiant plate 400 spaced apart from each other. The first metal radiant plate 100 is modified from the metal ceiling plate of the first embodiment while the second metal radiant plate 400 is modified from the aluminum foil of the first embodiment. The first metal radiant plate 100 has a first radiant heat exchange zone defined at a plate surface thereof that faces toward the second material radiant plate 400. The second metal radiant plate 400 is set corresponding to the first radiant heat exchange zone of the first metal radiant plate 100, wherein a sub-near field gap 102 is defined between the first metal radiant plate 100 and the second metal radiant plate 400 and is defined with the first radiant heat exchange zone of the first metal radiant plate 100. Accordingly, the dimensional size of the first radiant heat exchange zone of the first metal radiant plate 100 must be equal or larger than the dimensional size of the second radiant plate 400. The minimum distance between the second metal radiant plate 400 and the first radiant heat exchange zone is 2 mm. Accordingly, the first radiant heat exchange zone of the first metal radiant plate 100 and the second metal radiant plate 400 are configured for radiant heat exchange. Particularly, the first metal radiant plate 100 is arranged for exchanging heat with the environment to be temperature-regulated on an opposed plate surface thereof which is far from the second metal radiant plate 400. The second metal radiant plate 400 is arranged for exchanging heat with cooling and/or heating system on a plate surface of the second metal radiant plate 400 which is away from the first metal radiant plate 100.

[0079] Particularly, the first metal radiant plate 100 has a first plate surface for communicating with the environment to be temperature-regulated and an opposed second plate surface facing toward the second metal radiant plate 400, wherein the first radiant heat exchange zone is defined at the second plate surface of the first metal radiant plate 100. Likewise, the second metal radiant plate 400 has a first plate surface facing toward the second plate surface of the first metal radiant plate 100 and an opposed second plate surface facing opposite to the first metal radiant plate 100. The sub-near field gap 102 is defined between the second plate surface of the first metal radiant plate 100 and the first plate surface of the second metal radiant plate 400.

[0080] According to the second embodiment, the second metal radiant plate 400 is parallel to the first metal radiant plate 100, wherein the first radiant heat exchange zone is located between the first metal radiant plate 100 and the second metal radiant plate 400 and is far away from the second metal radiant plate 400. The radiation heat exchange device according to the second embodiment further comprises an isolation element 300 disposed between the first metal radiant plate 100 and the second metal radiant plate 400, wherein the isolation element 300 is disposed at the first radiation heat exchange zone of the first metal radiant plate 100. In other words, the sub-near field gap 102 is defined as an interval between the first metal radiant plate 100 and the second metal radiant plate 400. It is worth mentioning that the dimensional size of the isolation element 300 must be equal or larger than the dimensional size of the second radiant plate 400. Preferably, the sub-near field gap 102 is formed by the isolation element 300 disposed between the second metal radiant plate 400 and the first metal radiant plate 100 at the first radiation heat exchange zone. Preferably, the isolation element 300 is an isolation net having a mesh structure according to the second embodiment. The isolation element 300 is made of low thermal conductive material. The isolation element 300 is arranged for providing a supporting function, wherein the mesh structure of the isolation element 300 is arranged to provide spaces for radiation heat exchange. Depending on the thickness of the isolation element 300, the width of the sub-near field gap 102 is selectively adjusted. The thickness of the isolation element 300 is 2 mm, such that the minimum distance between the second metal radiant plate 400 and the first metal radiant plate 100 at the first radiation heat exchange zone is 2 mm.

[0081] According to the second embodiment, the isolation element 300, which is embodied as a layer of isolation net, is mounted and overlapped on the second plate surface of the first metal radiant plate 100 at the first radiant heat exchange zone thereof. The first plate surface of the second radiant plate 400 is spaced apart from the isolation element 300.

[0082] According to the second embodiment, the radiation heat exchange device further comprises a heat exchanging channel 500 and a heat exchange medium 502 disposed in the heat exchanging channel 500. The second metal radiant plate 400 is thermally contacted with the heat exchanging channel 500 to form a heat exchange core plate assembly. Accordingly, the second metal radiant plate 400 and the heat exchanging channel 500 are arranged for heat conduction and heat exchange in order to heat exchange with the cooling and/or heating system via the heat exchange medium 502.

[0083] According to the second embodiment, the radiation heat exchange device further comprises at least one heat radiation enhancing coating 200. In the second embodiment, two heat radiation enhancing coatings 200 are respectively provided on the plate surface of the first metal radiant plate 100 and the plate surface of the second metal radiant plate 400 which are facing toward each other. Particularly, one of the heat radiation enhancing coatings 200 is coated on a plate surface of the heat exchange core plate assembly while another heat radiation enhancing coating 200 is coated at the first radiation heat exchange zone of the first metal radiant plate 100. The heat radiation enhancing coatings 200 are arranged to further increase the efficiency of radiant heat exchange between the heat exchange core plate assembly and the first radiation heat exchange zone.

[0084] Particularly, one of the heat radiation enhancing coatings 200, as the first radiation enhancing coating, is coated on the second plate surface of the first metal radiant plate 100 at a position that the heat radiation enhancing coating 200 is sandwiched between the second plate surface of the first metal radiant plate 100 and the isolation element 300. The second radiation enhancing coating 200 is coated on the first plate surface of the second metal radiant plate 400.

[0085] According to the radiation heat exchange device of the second embodiment, the heat exchanging channel 500 is configured as a heat exchanging coil in the first embodiment. The second metal radiant plate 400 has a first indentation groove formed thereon by pressing a portion of second metal radiant plate 400 at the plate surface thereof, wherein the heat exchanging channel 500 is disposed at the first indentation groove in order to closely contact an outer wall of the heat exchanging channel 500 with an inner wall of the first indentation groove. The radiation heat exchange device further comprises at least one coil bracket 800 having a second indention groove, wherein the coil bracket 800 is coupled on the second plate surface of the second metal radiant plate 400 at a position that the second indention groove is aligned with and extended along with the first indention groove to form an accommodating channel to receive and retain the heat exchanging channel 500. Accordingly, a portion of the outer wall of the heat exchanging channel 500 is closely contacted with an inner wall of the second indention groove of the coil bracket 800 while an opposed portion of the outer wall of the heat exchanging channel 500 is closely contacted with the inner wall of the first indentation groove of the second metal radiant plate 400. The coil bracket 800 is arranged to ensure the close contact between the heat exchanging channel 500 and the second metal radiant plate 400 so as to ensure the heat exchanging channel 500 and the second metal radiant plate 400 being thermally conducted with each other. Preferably, the coil bracket 800 is an elongated arc-shaped strip made of high thermal conductive material. Therefore, the coil bracket 800 not only retains the heat exchanging channel 500 on the second metal radiant plate 400 but also thermal conducts with both the heat exchanging channel 500 and the second metal radiant plate 400. The difference between the coil bracket in the first embodiment and the coil bracket 800 in the second embodiment is that the coil bracket 800 in the second embodiment is made of high thermal conductive material. It is worth mentioning that the first indentation groove of the second metal radiant plate 400 is tangentially contacted with the isolation element 300 to thermally conduct the second metal radiant plate 400 with the first metal radiant plate 100 through the mesh structure of the isolation element 300.

[0086] In other words, the minimum distance between the second metal radiant plate 400 and the first metal radiant plate 100 is defined at a distance between the tangential point of the first indentation groove of the second metal radiant plate 400 and the first metal radiant plate 100. The tangential point of the first indentation groove of the second metal radiant plate 400 is the point being tangentially contacted with the isolation element 300. Therefore, when the thickness of the isolation element 300 is 2 mm, the minimum distance between the second metal radiant plate 400 and the first metal radiant plate 100 is 2 mm.

[0087] According to the second embodiment, the radiation heat exchange device further comprises a thermal insulation element 600, wherein the second metal radiant plate 400 and the first radiation heat exchange zone of the first metal radiant plate 100 are enclosed by the thermal insulation element 600 for preventing any heat loss therefrom. Particularly, the thermal insulation element 600 is mounted on the second plate surface of the first metal radiant plate 100 to enclose the heat exchange core plate assembly, and is sealed and mounted on the second plate surface of the second metal radiant plate 400 to form a thermal-insulated sealing cavity therebetween for preventing water vapor from entering into a space between the second metal radiant plate 400 and the first metal radiant plate 100 to form internal dew condensation. The radiation heat exchange device further comprises an outer casing 700 mounted on the second plate surface of the first metal radiant plate 100 to enclose the thermal insulation element 600 for forming the thermal-insulated sealing cavity. The outer casing 700 is configured to protect the thermal insulation element 600 from being damaged by any external force, and to reflect any external thermal radiation energy by an outer reflective surface of the outer casing 700. The outer reflective surface of the outer casing 700 can be a mirror surface. The thermal insulation element 600 is configured to isolate the heat transfer between the outer casing 700 and the second metal radiant plate 400.

[0088] According to the radiation heat exchange device of the second embodiment, two opening ends of the heat exchanging channel 500 are configured to pass through the thermal insulation element 600 and to extend out of the outer casing 700. The outer casing 700 has two through slots 702 formed thereat for the two opening ends of the heat exchanging channel 500 being extended out of the outer casing 700 through the through slots 701 respectively. The outer casing 700 further comprises two sealing rings 701 mounted at the through slots 702 and sleeved on the heat exchanging channel 500 for sealing the heat exchanging channel 500 around the through slots 702 where the heat exchanging channel 500 is extended out of the outer casing 700 so as to prevent any heat exchange through the through slots 702 of the outer casing 700.

[0089] According to the radiation heat exchange device of the second embodiment, the first metal radiant plate 100 and the second metal radiant plate 400 are preferably two aluminum plates, wherein the aluminum plates have the advantages of light weight, easy processing and low cost. It is appreciated that the first metal radiant plate 100 and the second metal radiant plate 400 can be two metal plates made of other thermal conductive material adapted for processing.

[0090] According to the radiation heat exchange device of the second embodiment, the heat exchanging channel 500 is embodied as a copper pipe. It is appreciated that the heat exchanging channel 500 can be made of other thermal conductive material. The heat exchange medium 502 can be any cold medium or heat medium for heat exchanging with the heat exchange core plate assembly. Preferably, the heat exchange medium 502 is in fluid form to flow along the heat exchanging channel 500 to remove the heat from the heat exchange core plate assembly.

[0091] According to the radiation heat exchange device of the second embodiment, the sub-near field gap 102 is formed between the second metal radiant plate 400 and the first radiation heat exchange zone of the first metal radiant plate 100, wherein the sub-near field gap 102 has a gap width defined as a distance between the second metal radiant plate 400 and the first radiation heat exchange zone of the first metal radiant plate 100. The minimum of the gap width is defined as 1-3 mm. Preferably, the gap width is configured to have 2 mm. It is worth mentioning that the first metal radiant plate 100 and the second metal radiant plate 400 will generate infrared radiation at their plate surfaces respectively. When the first metal radiant plate 100 and the second metal radiant plate 400 are located very close to each other, strong thermal radiation will occur, which is also known as near-field radiation. Specifically in the radiation heat exchange device, when the distance between the second metal radiant plate 400 and the first radiation heat exchange zone of the first radiant metal plate 100 is too close, through near-field radiation, the low temperature line of the heat exchanging coil during cooling will be projected onto the first radiant metal plate 100 to form an obvious cold temperature line. At this time, the plate surface of the first radiant metal plate 100 is easy for condensation at the corresponding position thereof, wherein when the distance between the heat exchange core plate assembly and the first radiant metal plate 100 is controlled at 1-3 mm, especially at 2 mm, the heat exchange core plate assembly and the first radiant metal plate 100 will have the strongest heat radiation heat exchange ability. Furthermore, during cooling, the first radiant metal plate 100 has no obvious low-temperature cold lines, which is defined as the sub-near field gap 102, to maximize the radiant heat exchange efficiency of the radiation heat exchange device of the present invention.

[0092] According to the radiation heat exchange device of the second embodiment, in order to ensure the sub-near field gap 102 being formed between the second metal radiant plate 400 and the first radiation heat exchange zone of the first metal radiant plate 100, the isolation element 300 is provided to ensure the first metal radiant plate 100 and the second metal radiant plate 400 being spaced apart from each other to form the sub-near field gap 102. Furthermore, the gap width of the sub-near field gap 102 can be selectively adjusted by the thickness of the isolation element 300. For example, the gap width of the sub-near field gap 102 can be enlarged by increasing the thickness of the isolation element 300. The isolation element 300 has the mesh structure and is made of low thermal conductive material. The isolation element 300 is configured to provide isolation and support functions, wherein the meshes of the isolation element 300 create spaces for radiation heat exchange. For optimizing the radiation heat exchange, the size of each of the meshes of the isolation element 300 can be enlarged. In other words, the larger the meshes of the isolation element 300 are, the better the radiation heat exchange is.

[0093] According to the radiation heat exchange device of the second embodiment, the second metal radiant plate 400 is in contact with the heat exchanging channel 500, such that the second metal radiant plate 400 is thermally conducted with the heat exchanging channel 500. It is appreciated that the larger contacting area between the second metal radiant plate 400 and the heat exchanging channel 500 is preferably provided to improve the efficiency of heat conduction. According to the second embodiment, the heat exchanging channel 500 has a circular cross section and is configured to have a S-shaped coil pipe to contact with the second metal radiant plate 400. Particularly, the heat exchanging channel 500 has a plurality of straight pipe portions parallel with each other and a plurality U-shaped curved pipe portions, wherein two ends of each of the curved pipe portions are communicatively connected to two ends of two of the straight pipe portions respectively, such that the heat exchange medium 502 is able to flow from one end of the heat exchanging channel 500 to an opposed end thereof through the straight pipe portions and the curved pipe portions. Accordingly, the straight pipe portions of the heat exchanging channel 500 are thermally contacted with the second metal radiant plate 400 and are disposed at the first indention grooves of the second metal radiant plate 400 respectively. It is appreciated that a length of each of the straight pipe portions of the heat exchanging channel 500 matches with a width of the second metal radiant plate 400. In other words, the curved pipe portions of the heat exchanging channel 500 are extended out of two opposed edges of the second metal radiant plate 400. The straight pipe portions of the heat exchanging channel 500 are covered by the coil bracket 800 to thermally contact the straight pipe portions of the heat exchanging channel 500 with the coil bracket 800. Accordingly, the straight pipe portions of the heat exchanging channel 500 are disposed at the second indention grooves of the coil brackets 800 respectively. In other words, bottom portions of the straight pipe portions of the heat exchanging channel 500 are disposed at the first indention grooves of the second metal radiant plate 400 respectively while upper portions of the straight pipe portions of the heat exchanging channel 500 are disposed at the second indention grooves of the coil brackets 800 respectively, such that the straight pipe portions of the heat exchanging channel 500 are enclosed between the second metal radiant plate 400 and the coil brackets 800. Preferably, each of the first and second indentions grooves has a semi-circular shape, wherein when the coil bracket 800 is coupled on the second metal radiant plate 400 at a position that the second indention groove is aligned with and extended along with the first indention groove, the accommodating channel is formed with a circular cross section to receive and retain the heat exchanging channel 500. The coil bracket 800 can be mounted on the second metal radiant plate 400 by crimping, bonding, welding or other mounting methods. Through this configuration, the coil bracket 800 and the second metal radiant plate 400 can be in close contact to form the heat exchange core plate assembly, so as to reduce the heat conduction gap with the heat exchange core plate assembly and to maximize the heat conduction efficiency with the heat exchange core plate assembly. Furthermore, the overall heat transfer of the heat exchange core plate is more uniform to reduce the effect of the heat transfer uniformity of the straight pipe portions of the heat exchanging channel 500. On the other hand, it also solves the problem of low temperature line that during cooling process, the temperature of the heat exchange medium 502 in the heat exchange coil plate assembly is further reduced to prevent any condensation. In addition, due to the uniformity of heat exchange, the temperature uniformity of the first radiant metal plate 100 can be further improved, wherein the entire first radiant metal plate 100 can be used for the temperature adjustment to the environment, which can greatly improve the heat exchange capacity of the radiation heat exchange device of the present invention.

[0094] According to the radiation heat exchange device of the second embodiment, the thermal insulation element 600 is mounted on the first metal radiant plate 100 to enclose the second metal radiant plate 400 and the first radiation heat exchange zone of the first metal radiant plate 100. Then, the outer casing 700 mounted on the first metal radiant plate 100 to enclose the thermal insulation element 600. Via the configuration of the thermal insulation element 600 and the outer casing 700, this configuration is able not only to effectively prevent the heat exchange between the heat exchange core plate assembly and the external environment to affect the heat exchange efficiency, but also to prevent the water vapor from the external environment entering into the outer casing 700, in result of forming internal condensation to affect the heat exchange efficiency. Since the outer casing 700 is sealed on the first metal radiant plate 100 to enclose the thermal insulation element 600, the thermal insulation element 600 is protected by the outer casing 700 from being damaged by any external force, and is formed with a second sealing cavity for preventing water vapor from entering into a space between the second metal radiant plate 400 and the first metal radiant plate 100. It is worth mentioning that the first sealing cavity is the thermal-insulated sealing cavity formed by sealing the thermal insulation element 600 on the first metal radiant plate 100. In other words, two different sealing cavities are formed for the heat exchange core plate assembly. Furthermore, the outer reflective surface of the outer casing 700, such as a mirror surface is able to reflect any external thermal radiation energy. Via the configuration of the thermal insulation element 600 and the outer casing 700, the heat exchange core plate assembly can be securely fixed and at the same time, the distance between the heat exchange core plate assembly and the first metal radiant plate 100 can be further retained.

[0095] According to the radiation heat exchange device of the second embodiment, two opening ends of the heat exchanging channel 500 are configured to pass through the thermal insulation element 600 and to extend out of the outer casing 700. The two sealing rings 701 are mounted on the outer casing 700 at the through slots 702 respectively and sleeved on the heat exchanging channel 500 for sealing the heat exchanging channel 500 around the through slots 702 so as to prevent any heat exchange through the through slots 702 of the outer casing 700. The radiation heat exchange device further comprises a connector head 501 coupled at each opening end of the heat exchanging channel 500. Via the connector head 501, two or more radiation heat exchange devices can be operatively connected with each other in a series or in parallel. Thus, the connector head 501 can also be connected to a pipeline of a heat exchange medium source to supply and receive the heat exchange medium 502 to and from the radiation heat exchange device.

[0096] According to of the second embodiment, the first metal radiant plate 100 is heat-exchanged with the second metal radiant plate 400 through the sub-near field gap 102 to regulate the temperature of the first plate surface of the first metal radiant plate 100 for regulating a temperature of the environment to be temperature-regulated. The temperature of the environment can be regulated via the cooling process or heating process of the radiation heat exchange device of the present invention.

[0097] According to of the second embodiment, the cooling process of the radiation heat exchange device comprises the steps of:

[0098] (a) absorbing an external radiant heat by the first metal radiant plate 100 and emitting the heat from the first metal radiant plate 100 to the second metal radiant plate 400;

[0099] (b) transferring the heat from the second radiant metal plate 400 to the heat exchanging channel 500; and

[0100] (c) removing the heat from the heat exchanging channel 500 by the heat exchange medium 502 as cold medium flowing in the heat exchanging channel 500, wherein the temperature of the heat exchange medium 502 is lower than the heat before heat exchange.

[0101] According to of the second embodiment, the heating process of the radiation heat exchange device comprises the steps of:

[0102] (1) supplying the heat exchange medium 502 as hot medium to flow in the heat exchanging channel 500 to transfer heat from the heat exchange medium 502 to the heat exchanging channel 500;

[0103] (2) transferring the heat from the heat exchanging channel 500 to the second radiant metal plate 400;

[0104] (3) emitting the heat from the second radiant metal plate 400 to the first radiant metal plate 100, wherein a temperature of the first radiant metal plate 100 is lower than that of the second radiant metal plate 100 before heat exchange; and

[0105] (4) emitting radiant heat by the first radiant metal plate 100 to an indoor environment. It is worth mentioning that the temperature at the plate surface of the first radiant metal plate 100 is increased to supply heat to the indoor environment.

[0106] The following tests are setup to verify the results of the examples.

[0107] An experimental room is set up to simulate the indoor environment, wherein the experimental room has a cube shape. The inner wall of a ceiling wall is a cold water radiant plate while the inner walls of the other five walls are hot water radiant plates respectively, such that the four surrounding walls and the floor are the hot water radiant plates to simulate the indoor environment.

[0108] The experimental method is that: The relative humidity of the simulated indoor environment inside the experimental room is controlled and maintained at 60%. Then, the cold water radiant plate as the ceiling wall is activated to adjust and maintain the cold water radiant plate at the preset temperature of 20° C. The five hot water radiant plates are then activated to activated to adjust and maintain the hot water radiant plates at the preset temperature of 26° C. so as to simulate the average radiant temperature of a real room indoor environment. At the same time, relevant parameters are detected and collected as follows: cold water inlet/outlet temperature, cold water flow rate, hot water inlet/outlet temperature, hot water flow rate, heat absorbed by the cold water radiant plate, and heat released by the hot water radiant plates.

[0109] The tests are divided into three groups:

[0110] Test A: For each of the cold water radiant plate and the hot water radiant plates, no heat radiation enhancing coating 200 is coated on neither the heat exchange core plate assembly nor the first radiant heat exchange zone of the first metal radiant plate 100. The minimum distance between the heat exchange core plate assembly and the first metal radiant plate 100 is set at 10 mm.

[0111] Test B: For each of the cold water radiant plate and the hot water radiant plates, the heat radiation enhancing coating 200 is coated on each of the heat exchange core plate assembly and the first radiant heat exchange zone of the first metal radiant plate 100. The minimum distance between the heat exchange core plate assembly and the first metal radiant plate 100 is set at 10 mm.

[0112] Test C: For each of the cold water radiant plate and the hot water radiant plates, the heat radiation enhancing coating 200 is coated on each of the heat exchange core plate assembly and the first radiant heat exchange zone of the first metal radiant plate 100. The minimum distance between the heat exchange core plate assembly and the first metal radiant plate 100 is set at 2 mm.

[0113] The results of the three test groups are shown in Table 1.

TABLE-US-00001 TABLE 1 Test data and results of Test A, B and C Test A Test B Test C cold water inlet/outlet  7/8  7/11  7/13 temperature (° C.) cold water flow 0.35 0.22 0.17 rate (L/s) hot water inlet/outlet 45/42 45/41 45/39 temperature (° C.) hot water flow 0.15 0.26 0.21 rate (L/s) heat absorbed by the cold 1.46 3.69 4.3  water radiant plate (kW) heat released by the hot 1.83 4.42 5.4  water radiant plates (kW)

[0114] From the data and results shown in Table 1, by comparing test C and test B, it can be clearly concluded that the sub-near field gap 102 being set at 2 mm can significantly improve the radiative heat exchange efficiency. Comparing test C with test A, it is obvious that the heat radiation enhancing coating 200 and the sub-near field gap 102 can greatly improve the radiative heat exchange efficiency. Meanwhile, there was no condensation on the bottom surface of the first metal radiant plate 100 of the cold water radiant plate in Test C.

[0115] The radiation heat exchange device of the present invention can be used as a heat exchange unit for indoor or outdoor temperature regulation in residential buildings and public buildings. Specifically, the radiation heat exchange device can be configured as wall panels, ceilings, floor panels and the like. The radiation heat exchange device can also be configured as a heat sink for electronic systems, such as communication base stations, server equipment, computer and the like. It is appreciated that the radiation heat exchange device of the present invention can also be used in other relatively low temperature heat exchange conditions.

[0116] When the radiation heat exchange device 101 is used for ceiling, the size of the radiation heat exchange device 101 is sized to fit and mount on one unit of the metallic plate members F8, thereby the radiation heat exchange device 101 can be install onto the false ceiling conveniently to provide the air conditioning effect

[0117] It will thus be seen that the objects of the present invention have been fully and effectively accomplished. The embodiments have been shown and described for the purposes of illustrating the functional and structural principles of the present invention and is subject to change without departure from such principles. Therefore, this invention includes all modifications encompassed within the spirit and scope of the following claims.