HEAT EXCHANGE SYSTEM, DEFROSTING DEVICE, FAN, HEAT EXCHANGER, HOUSING, AND USE OF A HEATING VARNISH

Abstract

A heat exchange system includes a heat exchanger configured to exchange heat between a transport fluid and a heat transfer fluid, a fan configured and arranged such that the transport fluid is capable of being transported through the heat exchanger, a defrosting device configured to defrost a layer of frost, and a housing at which at least the heat exchanger and the fan are arranged, a heating lacquer layer arranged on at least one of the heat exchanger, the fan, the defrosting device, and the housing, the heating lacquer layer being electrically connected to a contact device for electrical contact with the heating lacquer layer, and when the layer of frost is on at least one of the heat exchanger, the fan, the defrosting device, and the housing, the layer of frost is able to be defrosted in an operating state of the heating lacquer layer.

Claims

1. A heat exchange system comprising: a heat exchanger configured to exchange heat between a transport fluid and a heat transfer fluid flowing through the heat exchanger; a fan configured and arranged such that the transport fluid is capable of being transported through the heat exchanger; a defrosting device configured to defrost a layer of frost; and a housing at which at least the heat exchanger and the fan are arranged, a heating lacquer layer arranged on at least one of the heat exchanger, the fan, the defrosting device, and the housing, the heating lacquer layer being electrically connected to a contact device for electrical contact with the heating lacquer layer, and when the layer of frost is on at least one of the heat exchanger, the fan, the defrosting device, and the housing, the layer of frost is able to be defrosted in an operating state of the heating lacquer layer.

2. The heat exchange system in accordance with claim 1, wherein the heating lacquer layer is electrically conductive, is free of carbon nanotubes and comprises a polymer and a semiconductor material.

3. The heat exchange system in accordance with claim 1, wherein the polymer is acrylic, acrylic resin, epoxy resin, silicone or polyurethane.

4. The heat exchange system in accordance with claim 2, wherein the heating lacquer layer comprises acrylic resin as the polymer and tetrasodium diphosphate, calcium carbonate and graphite having a weight percentage of graphite of less than or equal to 20%.

5. The heat exchange system in accordance with claim 1, wherein the contact device comprises two electric conductors arranged adjacent one another, with the heating lacquer layer being arranged at least partly between the electric conductors.

6. The heat exchange system in accordance with claim 5, wherein the electric conductors comprise a wire, a braid, a metal mesh, a metal band, a metal film or a metal sheet.

7. The heat exchange system in accordance with claim 1, further comprising a protective layer arranged on the heating lacquer layer.

8. The heat exchange system in accordance with claim 1, further comprising at least one of a reflector layer configured to reflect infrared radiation and an insulating layer configured for thermal insulation is formed between the basic component and the heating lacquer layer.

9. The heat exchange system in accordance with claim 1, wherein a conductive layer for transferring the heat by means of thermal conduction and/or for electrical insulation is formed between the at least one of the heat exchanger, the fan, the defrosting device, and the housing and the heating lacquer layer.

10. The heat exchange system in accordance with claim 1, further comprising a defrosting flap and when a layer of frost is on the defrosting flap, the layer of frost is able to be defrosted in the operating state of the heating lacquer layer.

11. A defrosting device for the heat exchange system in accordance with claim 1, the defrosting device comprising the heating lacquer layer arranged on the defrosting device and the heating lacquer layer being electrically connected to the contact device for electrical contact with the heating lacquer layer, and when the layer of frost is disposed on the defrosting device, the layer of frost is capable of being defrosted in the operating state of the heating lacquer layer.

12. A fan for a heat exchange system in accordance with claim 1, the fan comprising: the heating lacquer layer arranged on the fan and the heating lacquer layer being electrically connected to the contact device for electrical contact with the heating lacquer layer, and when the layer of frost is disposed on the fan, the layer of frost is capable of being defrosted in the operating state of the heating lacquer layer.

13. A heat exchanger for a heat exchange system in accordance with claim 1, the heat exchanger comprising: the heating lacquer layer arranged on the heat exchanger and the heating lacquer layer being electrically connected to the contact device for electrical contact with the heating lacquer layer, and when the layer of frost is disposed on the heat exchanger, the layer of frost is capable of being defrosted in the operating state of the heating lacquer layer.

14. A housing for a heat exchange system in accordance with claim 1, the housing comprising: the heating lacquer layer arranged on the housing and the heating lacquer layer being electrically connected to the contact device for electrical contact with the heating lacquer layer, and when the layer of frost is disposed on the housing, the layer of frost is capable of being defrosted in the operating state of the heating lacquer layer.

15. A method comprising: operating a heating lacquer for manufacturing the heating lacquer layer on the heat exchange system in accordance with claim 1.

16. A method comprising: operating a heating lacquer for manufacturing the heating lacquer layer on the defrosting device in accordance with claim 11.

17. A method comprising: operating a heating lacquer for manufacturing the heating lacquer layer on the fan in accordance with claim 12.

18. A method comprising: operating a heating lacquer for manufacturing the heating lacquer layer on the heat exchanger in accordance with claim 13.

19. A method comprising: operating a heating lacquer for manufacturing the heating lacquer layer on the housing in accordance with claim 14.

20. The heat exchange system in accordance with claim 7, wherein the protective layer is at least one of an insulating lacquer, a glass fiber reinforced plastic and a protective film.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Referring now to the attached drawings which form a part of this original disclosure.

[0047] FIG. 1 is a heat exchange system known from the prior art;

[0048] FIG. 2 is a first embodiment of a heat exchange system in accordance with the invention;

[0049] FIG. 3 is a first embodiment of a defrosting device in accordance with the invention; and

[0050] FIG. 4 is a second embodiment of a defrosting device in accordance with the invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0051] A schematic representation of a first embodiment of a heat exchange system 1 in accordance with the invention is shown in FIG. 2. FIG. 2 substantially corresponds to FIG. 1 so that only the differences will be looked at. A heating lacquer layer 6 is arranged at the defrosting device 4, more exactly at the first pan 45, wherein the heating lacquer layer 6 is electrically connected to a contact device (not shown, see FIG. 3) for the electrical contacting of the heating lacquer layer 6 and a layer of frost can be defrosted in the operating state of the heating lacquer layer 6. In this respect, an electric voltage is applied to the heating lacquer layer 6 so that an electric current flows in the heating lacquer layer. In this respect, the heating lacquer layer 6 acts as an ohmic resistor since the heating lacquer layer 6 is configured as an electrical resistance heater. The electric current that flows through the heating lacquer layer 6 can advantageously be set via the degree of electric voltage, and thus via it an electric heating power. The defrosting device 4 or the inner pan 46 is thereby advantageously heated a lot more evenly over the total surface coated with the heating lacquer layer than by the known measures. Due to the high radiation portion of the heating lacquer layer 6, not only the first pan 46 is heated, but rather adjacent basic components are also simultaneously heated, for example the second pan 44, by heat radiation.

[0052] A first embodiment of a defrosting device 4 in accordance with the invention is shown in FIG. 3. The heating lacquer layer 6 is arranged at the first pan 46. The heating lacquer layer 6 can be an electrically conductive carbon nanotube-free heating lacquer layer 6. The heating lacquer layer 6 can comprise a polymer and a semiconductor material. A contact device 7 is furthermore shown that is electrically connected to the heating lacquer layer 6 to electrically contact it. It is thus advantageously made possible, for example, to apply an electric voltage to the heating lacquer layer 6 by the contact device 7 so that an electric current flows through the heating lacquer layer 6. This electric current is then converted into heat that is transferred by thermal conduction to a basic component and/or is led off to an environment in the form of thermal radiation, whereby a layer of frost on the first pan 46 can be defrosted. Advantageously, a very uniform thermal transfer can be achieved and an even infrared spectrum can be steered by varying the electric voltage or the power consumption respectively. Temperatures from 0° C. to 400° C. are thereby in particular advantageously achievable, wherein, for example, different voltages or voltage levels can be applied in the form of DC voltage or AC voltage. A target temperature can in this respect advantageously be reached within a few seconds as a rule.

[0053] The heating lacquer layer 6 in particular advantageously has a positive temperature coefficient (PTC). This means that with an increasing temperature, an internal conductive resistance also increases, whereby an upper limit is set for the achievable temperature. This advantageously results in a particularly safe operation of the heating lacquer layer 6. A further additional safety limit can in particular advantageously be set via the chemical composition of a heating lacquer that is used for the heating lacquer layer 6, for example via a suitable selection of the polymer and/or of the semiconductor material. Furthermore, the effect of the positive temperature coefficient can be used as an indirect temperature sensor since the resistance value as a rule depends on the instantaneous temperature of the heating lacquer layer 6, whereby there is advantageously no need for further temperature sensors.

[0054] A schematic representation of a second embodiment of a defrosting device 4 in accordance with the invention is shown in FIG. 4. FIG. 4 substantially corresponds to FIG. 3 so that only the differences will be looked at. The contact device 7 comprises two electric conductors 8 arranged next to one another, with the heating lacquer layer 6 being at least partly arranged between the electric conductors 8. The electric conductors 8 are arranged at the second pan 46 and extend substantially in parallel with one another. The heating lacquer layer 6 that touches or contacts the electric conductors 8 is formed between the two electric conductors 8 so that an electric contacting of the heating lacquer layer 6 is achieved via them. Provision can be made in an embodiment, not shown, that at least one of the electric conductors 8, preferably all the electrical conductors, is/are replaced by a wire, by a braid by a metal film, by a metal band, or by a metal sheet.