System and method for generating heating and cooling power in a treatment plant for workpieces

Abstract

The present invention relates to a system (100) for generating heating and cooling power in a treatment plant (102) for workpieces, in particular a vehicle body paint shop (103), wherein the system (100) comprises the following: at least one cold water network (104) for supplying consumer processes (146) with cold water, which has at least one cold water storage device (110) for compensating process load peaks and/or at least one cold water network heat transfer device (112, 154, 158) for recovering heat from consumer processes (146); at least one warm water network (106) for supplying consumer processes (146) with warm water, which has at least one warm water storage device (120) for compensating process load peaks and/or at least one warm water network heat transfer device (122, 166) for recovering heat from consumer processes (146); and at least one heat pump device, in particular at least one first heat pump device (132),
wherein the cold water network (104) is connected to the at least one warm water network (106) by means of the heat pump device (132), and wherein the networks (104, 106) have different temperature levels.

The present invention furthermore relates to a method for generating heating and cooling power in a treatment plant (102) for workpieces, in particular a vehicle body paint shop (103).

Claims

1. A system for generating heating and cooling power in a treatment plant for workpieces, optionally a vehicle body paint shop, wherein the system comprises: at least one cold water network for supplying consumer processes with cold water, which has at least one cold water storage device for compensating process load peaks and/or at least one cold water network heat transfer device for recovering heat from consumer processes; at least one warm water network for supplying consumer processes with warm water, which has at least one warm water storage device for compensating process load peaks and/or at least one warm water network heat transfer device for recovering heat from consumer processes; and at least one heat pump device, optionally at least one first heat pump device, wherein the at least one cold water network is connected to the at least one warm water network by the at least one heat pump device, and wherein the networks have different temperature levels.

2. The system as claimed in claim 1, wherein the system includes at least one hot water network for supplying consumer processes with hot water, wherein the at least one hot water network has at least one hot water storage device for compensating process load peaks.

3. The system as claimed in claim 1, wherein the system includes at least one hot water network for supplying consumer processes with hot water, wherein the at least one hot water network has at least one hot water network heat transfer device for recovering heat from consumer processes.

4. The system as claimed in claim 2, wherein the system includes at least one second heat pump device, wherein a) the at least one warm water network is connected to the at least one hot water network by the at least one second heat pump device, or b) the at least one hot water network is connected to the at least one cold water network by the at least one second heat pump device.

5. The system as claimed in claim 2, wherein the at least one cold water storage device and/or the at least one warm water storage device and/or the at least one hot water storage device are/is connected to a feed and a return of the respective network.

6. The system as claimed in claim 1, wherein each of the networks includes at least one consumer process circuit and/or at least one heat pump circuit, wherein the at least one storage device of the respective network is incorporated directly or indirectly into each of the circuits.

7. The system as claimed in claim 1, wherein at least one of the networks includes at least one heat recovery circuit into which the respective storage device is directly or indirectly incorporated.

8. The system as claimed in claim 1, wherein the at least one first heat pump device can be controlled according to at least one variable from the group including refrigerating power, heat requirement, temperature, accumulator energy charge and accumulator capacity.

9. The system as claimed in claim 4, wherein the at least one second heat pump device is a high-temperature heat pump.

10. The system as claimed in claim 1, wherein the system has at least one latent heat storage device, which is arranged in the at least one cooling water network and/or in the at least one warm water network.

11. The system as claimed in claim 1, wherein the system has at least one thermal wheel for moisture and heat transfer in the warm water network.

12. The system as claimed in claim 1, wherein the at least one warm water network has at least one free cooling device, preferably a free cooling device for summer operation of the treatment plant.

13. The system as claimed in claim 2, wherein the at least one cold water network has a temperature level of 0 C. to 30 C., preferably 0 C. to 25 C., wherein the at least one warm water network has a temperature level of 20 C. to 65 C., preferably 25 C. to 60 C., and wherein the at least one hot water network has a temperature level of 55 C. to 100 C., preferably 60 C. to 100 C.

14. The system as claimed in claim 13, wherein the temperature level of the at least one cold water network and/or of the at least one warm water network can be adapted to the air humidity and/or the temperature of an environment of the treatment plant.

15. The system as claimed in claim 1, wherein a storage capacity of the cold water storage device is greater by 25% to 400%, optionally by 50% to 300%, than a storage capacity of the warm water storage device.

16. The system as claimed in claims 2, wherein a storage capacity of the hot water storage device is smaller than a storage capacity of the cold water storage device and/or of the warm water storage device, preferably 10% to 75% smaller, as a further preference 25% to 50% smaller.

17. The system as claimed in claim 2, wherein the at least one hot water network is connected indirectly and/or directly to the at least one cold water network.

18. A method for generating heating and cooling power in a treatment plant for workpieces, preferably in a vehicle body paint shop, wherein the method is carried out with a system as claimed in claim 1 and comprises: providing cold and/or warm water to the consumer processes of the treatment plant; temporarily storing heat energy in the cold water storage device and/or the warm water storage device; recovering heat energy from the exhaust air of one or more consumer processes; and generating refrigerating power and/or heating power by the heat pump device, optionally the first heat pump device.

19. The method as claimed in claim 18, wherein the method further includes: providing hot water to the consumer processes of the treatment plant; and temporarily storing heat energy in the hot water storage device.

20. The method as claimed in claim 18, wherein the method further includes: generating heating power by a further heat pump device, optionally a second heat pump device.

21. The method as claimed in claim 18, wherein heat is pumped indirectly and/or directly from the cold water network into the hot water network.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0089] FIG. 1 shows a schematic illustration of a first embodiment of a system according to examples disclosed herein;

[0090] FIG. 2 shows a schematic illustration of a second embodiment of a system according to examples disclosed herein;

[0091] FIG. 3 shows a schematic illustration of a third embodiment of a system according to examples disclosed herein;

[0092] FIG. 4 shows another schematic illustration of the third embodiment from FIG. 3;

[0093] FIG. 5 shows a schematic illustration of a fourth embodiment of a system according to examples disclosed herein;

[0094] FIG. 6 shows another schematic illustration of the fourth embodiment from FIG. 5;

[0095] FIG. 7 shows a schematic illustration of a fifth embodiment of a system according to examples disclosed herein; and

[0096] FIG. 8 shows a schematic illustration of a sixth embodiment of a system according to examples disclosed herein.

[0097] Elements which are identical or have the same effect functionally are provided with the same reference signs in all the figures.

DETAILED DESCRIPTION OF THE DRAWINGS

[0098] A first embodiment of a system 100 designated 100 as a whole, which is illustrated in FIG. 1, serves to generate heating and cooling power in a treatment plant 102 for workpieces.

[0099] The treatment plant 102 is, in particular, a vehicle body paint shop 103.

[0100] The system 100 according to examples disclosed herein comprises at least one cold water network 104, at least one warm water network 106 and at least one hot water network 108.

[0101] The networks 104, 106, 108 preferably have different temperature levels or different temperatures, that is to say, in particular, the temperature of the water conveyed in the respective network differs from the temperature of the water conveyed in the two other networks.

[0102] The cold water network 104 preferably has a temperature level of 0 C. to 25 C., the warm water network 106 preferably has a temperature level of 25 C. to 60 C., and the hot water network 108 preferably has a temperature level of 60 C. to 100 C.

[0103] The cold water network 104 has at least one cold water storage device 110 and at least one cold water network heat transfer device 112.

[0104] Furthermore, the cold water network 104 comprises at least one consumer process circuit 114, at least one heat pump circuit 116 and at least one heat recovery circuit 118, in which the cold water network heat transfer device 112 is arranged.

[0105] The warm water network 106 has at least one warm water storage device 120 and at least one warm water network heat transfer device 122.

[0106] Furthermore, the warm water network 106 comprises at least one consumer process circuit 124, at least one first heat pump circuit 126, at least one second heat pump circuit 128, and at least one heat recovery circuit 130, in which the warm water network heat transfer device 122 is arranged.

[0107] The cold water network 104 and the warm water network 106 are connected to one another by means of a first heat pump device 132, in particular the heat pump circuit 116 of the cold water network 104 and the first heat pump circuit 126 of the warm water network 106 are connected to the first heat pump device 132.

[0108] The first heat pump storage device 132 is preferably a conventional industrial heat pump.

[0109] The hot water network 108 has at least one hot water storage device 134 and at least one hot water network heat transfer device 136.

[0110] Furthermore, the hot water network 108 also comprises at least one consumer process circuit 138, at least one heat pump circuit 140 and at least one heat recovery circuit 142, in which the hot water network heat transfer device 136 is arranged.

[0111] The warm water network 106 and the hot water network 108 are connected to one another by means of a second heat pump device 144, in particular the second heat pump circuit 128 of the warm water network 106 and the heat pump circuit 140 of the hot water network 108 are connected to the second heat pump device 144.

[0112] The second heat pump device 144 is preferably a high-temperature heat pump.

[0113] The first and the second heat pump device 132, 144 are electrically operated pump devices with a defined installed power, wherein the defined power is preferably matched to the maximum power to be produced for the required cold or heat in the system 100 in time periods of climatic peak values.

[0114] The consumer process circuits 114, 124, 138 of the networks 104, 106, 108 provide cold, warm and/or hot water to one or more consumer processes 146.

[0115] In a paint shop 103, consumer processes 146, the exhaust air 148 of which is fed substantially to the one or more cold water network heat transfer devices 112, are, for example, cooling zones or pre-treatment stations. In a paint shop 103, consumer processes 146, the exhaust air 148 of which is fed substantially to the one or more warm water network heat transfer devices 122, are, for example, driers.

[0116] Exhaust air 148 discharged from the one or more consumer processes 146 is discharged from the treatment plant 102 via an exhaust air line 150 leading to an exhaust air outlet over the roof 152.

[0117] The exhaust air line leads through the heat transfer devices 112, 122, 136 of the networks 104, 106, 108, as a result of which the exhaust air or discharged process media 148 flow through these networks and, in the process, transfer some of the heat energy contained in the exhaust air back to the heat recovery circuits 118, 130, 142.

[0118] The exhaust air 148 from the consumer processes 146 is cooled with cold water in the cold water network heat transfer device 112 before it reaches the exhaust air outlet over the roof 152, thereby reducing the exhaust air temperature over the roof to a minimum.

[0119] The storage devices 110, 120, 134 are connected to the feed and return of the respective network 104, 106, 108 and damp the fluctuations in the respective network 104, 106, 108 during the provision of water for the consumer processes 146, wherein the capacity of the storage devices 110, 120, 134 is preferably designed to smooth the load curve of the consumer processes 146 within a day. Consequently, the heat pump device 132, 144 can inter alia be designed for a minimum.

[0120] Particularly in a paint shop 103, all the consumer processes 146 which are dependent on external conditions, i.e. climatic conditions outside the paint shop, are supplied almost exclusively by the cold water network 104 and the warm water network 106, for which reason the storage capacity of the cold water storage device 110 and of the warm water storage device 120 should be dimensioned so as to be greater than the capacity of the hot water storage device 134.

[0121] By virtue of the coupling of the cold water network 104 to the warm water network 106 via the first heat pump device 132, the heat energy fed into the cold water network 104 can be raised by means of the first heat pump device 132 to a temperature level that is useful for the consumer processes 146 supplied by the warm water network 106.

[0122] By virtue of the connection of the first heat pump device 132 to the cold water network 104 and to the warm water network 106, this device generates cold, on the one hand, and heat, on the other hand, thereby making it possible to achieve a maximum efficiency and utilization. Moreover, simultaneous generation of refrigerating and heating power is possible outside the extreme months in the winter and summer. The installed electric power is preferably matched to the maximum refrigerating power to be provided.

[0123] By means of the second heat pump device 144, consumer processes 146 of the hot water network 108 which have a requirement for a higher temperature level, that is to say, in particular, a water temperature level of over 60 C., can be supplied with the necessary heat energy.

[0124] If there is or remains sufficient heat energy in the cold water network 104 and/or in the warm water network 106, this can be raised to the temperature level of the hot water network 108 by means of the second heat pump device 144 or by means of the first and the second heat pump device 132, 144.

[0125] Thus, advantageously, no additional equipment for generating the heating and cooling power during normal operation of a treatment plant 102 such as a paint shop 103 is necessary apart from the heat pump devices 132, 144. Apart from this, there are, corresponding to the abovementioned temperature levels of the networks 104, 106, 108, consumer processes 146 which require temperatures over 100 C., e.g. drying processes. Furthermore thermal wheels (not illustrated) for reducing the temperature level of the warm water network 106 can be integrated between the inlet and exhaust air of all consumer processes 146 which require humidified inlet air. Because of the moisture transfer of a thermal wheel, preconditioning of supplied fresh air is possible, and the temperature level of the fresh air ahead of the humidifier inlet can be correspondingly lowered. Conditioning of fresh air to a relative humidity of 65% is thus also possible in winter under dry and cold external conditions.

[0126] In summer, the temperature level of the warm water network 106 is preferably lowered, boosting the efficiency of the first heat pump device for cold water generation. However if feeding of excess heat energy from the warm water network 106 to the external air outside the treatment plant 102 or to the exhaust air 148 of the consumer processes 146 is envisaged, raising the temperature level of the warm water network should be considered.

[0127] In winter, the temperature level of the cold water network 104 is lowered, thereby making it possible to achieve efficient heat recovery. By virtue of the resulting reduction in the COP, the first heat pump device 132 can provide a larger quantity of heat to the warm water network 106 from the same heat energy from the cold water network 104.

[0128] Further details of the differences between the additional embodiments of the system 100 according to examples disclosed herein which are illustrated in FIGS. 2 to 7 will be explored below, wherein it should be understood that all the advantages and technical effects which have been described above in connection with the first embodiment can also be achieved with the embodiments below.

[0129] FIG. 2 illustrates a second embodiment of the system 100 according to examples disclosed herein, in which a plurality of parallel heat transfer devices is incorporated into the heat recovery circuit 118 of the cold water network 104. Thus, for example, the heat energy contained in exhaust air 156 coming from a separate consumer process 146 is transferred to the cold water in the heat recovery circuit 118 in a separate heat transfer device 154, and the heat energy contained in exhaust air 160 coming from another separate consumer process 146 is transferred in another separate heat transfer device 158. In addition, the heat energy contained in the exhaust air 148 carried in the exhaust air line 150 is transferred in the heat transfer device 112 to the cold water.

[0130] The system 100 furthermore comprises an air compressor device 162, the waste heat from which in a first circuit 164 is transferred to the warm water by means of another heat transfer device 166 in the heat recovery circuit 130 of the warm water network 106, and is transferred in a second circuit 168, by means of a hot water network heat transfer device 136 in the heat recovery circuit 142 of the hot water network 108, to the hot water.

[0131] In the second embodiment of the system which is shown in FIG. 2, the exhaust air line 150 preferably does not lead through the hot water network heat transfer device 136.

[0132] In the third embodiment of the system 100, which is illustrated in FIGS. 3 and 4, a latent heat storage device 170 is provided in addition, said device being connected via a latent heat storage circuit 172 to the cold water network 104 and the warm water network 106. In summer, the excess heat energy of the warm water network 106 is stored in the latent heat storage device 170, as shown in FIG. 3. This heat energy stored in the latent heat storage device 170 can then be made available in the cold water network 104 in winter, as shown in FIG. 4, and can then be raised from the cold water network 104 to the temperature level of the warm water network 106 by means of the first heat pump device 132.

[0133] FIGS. 5 and 6 illustrate a fourth embodiment of the system 100 according to examples disclosed herein, wherein the summer mode of the system 100 in the treatment plant 102 can be seen.

[0134] In the summer mode, the first heat pump device is determined by the required refrigerating power of the consumer processes 146. The heating power generated is discharged to the warm water storage device 120. If the consumption values, including the second heat pump device 144, are greater than what is generated, any heat recovery taking place via the heat recovery circuit 130 is first of all discontinued, as illustrated in FIG. 6.

[0135] If there continues to be an excess, e.g. owing to the increasing of the feed temperature of the warm water network 106, the heat generated must first of all be discharged from the treatment plant 102 over the roof 152 via the exhaust air outlet by means of an exhaust air heat transfer device 174.

[0136] If this is not sufficient, a free cooling device 176 should be provided, which is incorporated into the warm water network 106 via a free cooling circuit 178. The excess heat energy can be removed from the warm water network 106 by means of the free cooling device 176.

[0137] It can furthermore be seen in the fourth embodiment illustrated in FIGS. 5 and 6 that the cold exhaust air 148 of one or more consumer processes 146 downstream of the hot water network heat transfer device 136 can be fed back to one or even more consumer processes 146, which can use the reduced-temperature exhaust air as inlet air, thereby ensuring that the heat recovery circuit 130 is not additionally subjected to the heat energy from the heat recovery of the hot water network 108.

[0138] A winter mode is illustrated in FIG. 7 in a fifth embodiment of the system 100. In this fifth embodiment, as in the case of the second embodiment in FIG. 2, the three heat transfer devices 112, 154, 158 are provided in the heat recovery circuit 118 of the cold water network 104, said heat transfer devices recovering heat energy in parallel from the consumer processes 156, 160 and the exhaust air line 150 into the cold water network 104.

[0139] In addition, the heat transfer circuit 130 of the warm water network 166 likewise has the further heat transfer device 166, via whichafter transfer of the heat energy or at least some of the heat energy from the exhaust air 148 of one or more consumer processes 146the reduced-temperature exhaust air 148 is fed to one or more consumer processes 146 and thus in the first instance remains in the treatment plant 102.

[0140] The same applies to the hot water network 108, in the heat recovery circuit 142 of which the reduced-temperature exhaust air 148 is likewise fed back to one or more consumer processes 146 downstream of the hot water network heat transfer device.

[0141] FIG. 8 illustrates, in a sixth embodiment of the system 100, that, in comparison with the first embodiment from FIG. 1, the available power from the hot water network 108 can be used directly as an alternative to the generation of refrigerating power in the cold water network 104. As a consequence, the warm water network 106 and the first heat pump device 132 are bypassed.

[0142] For this purpose, on the one hand, the second heat pump device 144 is connected via the second heat pump circuit 128 of the cold water network 104 to the cold water storage device 110 and, on the other hand, via the heat pump circuit 140 of the hot water network 108 to the hot water storage device 134, thereby enabling heat to be pumped directly from the cold water network 104 into the hot water network 108. In this way, the consumer processes in the hot water network 146 can be supplied by means of waste heat from the cold water network 104.

List of Reference Signs

[0143] 100 system [0144] 102 treatment plant [0145] 103 paint shop [0146] 104 cold water network [0147] 106 warm water network [0148] 108 hot water network [0149] 110 cold water storage device [0150] 112 cold water network heat transfer device [0151] 114 consumer process circuit [0152] 116 heat pump circuit [0153] 118 heat recovery circuit [0154] 120 warm water storage device [0155] 122 warm water network heat transfer device [0156] 124 consumer process circuit [0157] 126 first heat pump circuit [0158] 128 second heat pump circuit [0159] 130 heat recovery circuit [0160] 132 first heat pump device [0161] 134 hot water storage device [0162] 136 hot water network heat transfer device [0163] 138 consumer process circuit [0164] 140 heat pump circuit [0165] 142 heat recovery circuit [0166] 144 second heat pump device [0167] 146 consumer process [0168] 148 exhaust air [0169] 150 exhaust air line [0170] 152 exhaust air outlet over the roof [0171] 154 heat transfer device [0172] 156 exhaust air [0173] 158 heat transfer device [0174] 160 exhaust air [0175] 162 air compressor device [0176] 164 first circuit [0177] 166 heat transfer device [0178] 168 second circuit [0179] 170 latent heat storage device [0180] 172 latent heat storage circuit [0181] 174 exhaust air heat transfer device [0182] 176 free cooling device [0183] 178 free cooling circuit