A heat pump system, a swimming pool comprising the heat pump system and a method of operating the heat pump system

Abstract

A heat pump system, a swimming pool comprising the heat pump system and a method of operating the heat pump system A heat pump system (1), comprising a first and a second heat exchanger 5 (11, 12), an expansion valve (13), a compressor (14) and a fan (19), wherein the second heat exchanger (12) is in the form of a U-shaped surface (21) with two opposing legs (23, 24), a first leg (23) of the two opposing legs and a second leg (24) of the two opposing legs, and a base (22) interconnecting the first (23) and the second (24) leg, wherein the U-shaped surface (21) 10 forms fan chamber walls (10) delimiting a fan chamber (25) enveloping the fan (19), the fan chamber (25) being adapted such that in operation the fan (19) creates an airflow (35, 36) between and through the base (22) and at least part of the opposing legs (23, 24).

Description

[0001] A heat pump system, a swimming pool comprising the heat pump system and a method of operating the heat pump system Technical field

[0002] The present invention relates to a heat pump system, a swimming pool comprising such heat pump system and a method of operating the heat pump system.

[0003] Background art

[0004] Heat pump systems are well known in the state of the art. Usually a heat pump system comprises a first and a second heat exchanger, an expansion valve and a compressor. The expansion valve interconnects the outlet of the first heat exchanger, then called the condenser, and the inlet of the second heat exchanger, then called the evaporator, and mutatis mutandis the compressor interconnects the inlet of the condenser, in this case the first heat exchanger, and the outlet of the evaporator, the second heat exchanger. A fan of the heat pump system is for example provided to, in operation, create an airflow through the second heat exchanger.

[0005] However, it has been found that the performance of such heat pump systems is too low.

[0006] Disclosure of the invention

[0007] The heat pump system according to the present invention comprises a first and a second heat exchanger, an expansion valve, a compressor and a fan.

[0008] It is an object of the present invention to provide heat pump system with a higher performance.

[0009] This object is achieved according to the invention with a heat pump system showing the technical characteristics of the first independent claim.

[0010] Thereto, the second heat exchanger is in the form of a U-shaped surface with two opposing legs, a first leg of the two opposing legs and a second leg of the two opposing legs, and a base interconnecting the first and the second leg. The U-shaped surface forms fan chamber walls delimiting a fan chamber enveloping the fan. The fan chamber is adapted such that in operation the fan creates an airflow between and through the base and at least part of the opposing legs.

[0011] It has been found that with a heat pump system according to the present invention, as the airflow flows between and through the base and at least part of the opposing legs, both the base and the opposing legs forming part of the second heat exchanger, the airflow passes the second heat exchanger two times. Indeed, the airflow passes through the second heat exchanger a first time when if flows through the base and a second time when it passes though at least part of the opposing legs. It has been found that such configuration has a positive impact on the performance of the heat pump, more specifically it has been found that such configuration had a positive impact on the coefficient of performance, also known as and abbreviated as COP. For example, a coefficient of performance of between 24 and 28 is possible, more specifically of between 25 and 27, even more specifically between 26,0 and 26,5, for example 26,4. The COP of 26,4 was for example obtained with an air temperature of 27°C, a water temperature of 26°C, a relative humidity of 80% where a heating power of 10,59kW was reached.

[0012] Further, it has been found that the U-shaped surface of the second heat exchanger better conformed with the round shape of the fan also having a positive impact on the performance of the heat pump, more specifically it has been found that such configuration had a positive impact on the coefficient of performance.

[0013] According to preferred embodiments of the present invention, the opposing legs are connected to the base by curved sections of the U- shaped surface, the curved sections being part of the respective legs, the curved section preferably having a radius of curvature substantially corresponding to the radius of the fan. Such configuration has been found to have a positive impact on the performance of the heat pump, more specifically it has been found that such configuration had a positive impact on the coefficient of performance.

[0014] According to preferred embodiments of the present invention, the U- shaped surface is made up of adjacently positioned conduits, preferably provided with heat fins, going back and forth over the U-shaped surface in at least one layer, as is well known by the person skilled in the art for the construction of heat exchangers, especially heat exchangers designed for exchanging heat between a liquid guided inside and through the conduits and air surrounding the conduits. The conduits can for example extend substantially along the direction of the U-shape of the U-shaped surface, i.e. substantially along the extending direction of the opposing legs with respect to the base and along the direction along which the base interconnects the opposing legs, but can also extend along a direction substantially perpendicular to that, i.e. the height direction of the U-shaped surface or a combination of these two directions, for example when applying multiple layers of conduits building up the U-shaped surface, for example with each layer having a different direction along which the conduits extend. Preferably, the conduits are made up from substantially a single piece of tubing which has been bent into the desired shape, with, for example, U- shaped bends at the end of the opposing legs and further running along the entire U-shaped surface. For example a single piece of tubing is bent along the first of the opposing legs subsequently along the base, after being bent into a curved section, than along the second opposing leg, again after having being bent into a curved section, and then, after having been bent in a U-shaped fashion, back along the second leg, along the base and back to the end of the first leg along the first leg, etc. The tubing preferably is made of a material that is relatively heat conductive, such as for example copper.

[0015] According to preferred embodiments of the present invention, the fan is positioned between the opposing legs, more preferably, the fan is positioned within a volume defined by the U-shaped surface. Such configuration has been found to further improve the performance of the heat pump, more specifically it has been found that such configuration had a positive impact on the coefficient of performance.

[0016] According to preferred embodiments of the present invention, the fan is symmetrically positioned between the opposing legs, more preferably with its axis of rotation at the middle between the opposing legs and or with its axis of rotation at the middle of the height of the opposing legs and the base. Such symmetrical configuration has been found to further improve the performance of the heat pump, more specifically it has been found that such configuration had a positive impact on the coefficient of performance.

[0017] According to preferred embodiments of the invention, the fan chamber is further delimited by a separation plate opposing the base and interconnecting the first and the second leg. Preferably, the fan is positioned in between the base and the separation plate.

[0018] According to preferred embodiments of the present invention, the heat pump system comprises at least one electronic component at a side of the separation plate facing away from the fan with cooling fins of the electronic component extending through the separation plate. According to such a configuration the separation plate protects the electronic components from the airflow whereas improving cooling of the electronic components by allowing the airflow in operation to cool the cooling fins as they face the fan.

[0019] According to preferred embodiments of the present invention, the separator plate separates the fan chamber from the first heat exchanger, which preferably is the condenser, the expansion valve, the compressor and / or at least one electronic component, more preferably the separator plate separates the fan chamber from the first heat exchanger, which preferably is the condenser, the expansion valve, the compressor and at least one electronic component. By shielding these component from the second heat exchanger and the at least one airflow through it, the performance of the heat pump can be further improved, more specifically it has been found that such configuration had a positive impact on the coefficient of performance. Such effect can be further improved by properly thermally insulating the separator plate.

[0020] According to preferred embodiments of the present invention, the heat pump system is enclosed by a housing to further protect the different components of the heat pump system.. By properly thermally insulating the housing, the performance of the heat pump system can also be increased.

[0021] According to further preferred embodiments of the present invention, the separation plate is formed such as to, in operation, direct the airflow towards the part of the opposing legs.

[0022] According to preferred embodiments of the present invention, the fan chamber comprises two adjacent fan chamber parts. A first fan chamber part is delimited by the first leg and a second fan chamber part is delimited by the second leg.

[0023] According to further preferred embodiments of the present invention, the heat pump system comprises a middle plate delimiting the first fan chamber part from the second fan chamber part. By delimiting the first fan chamber part from the second fan chamber part with the middle plate, different airflows between the base and the opposing legs can be better separated from each other such as to avoid interference between them and hence a loss of performance of the heat pump.

[0024] According to preferred embodiments of the present invention, the heat pump system comprises an airflow inlet and an airflow outlet and the fan is provided to, in operation, suck air through the airflow inlet and blow air through the airflow outlet. If present, preferably, the separation plate is provided to redirect the airflow to the airflow outlet.

[0025] According to further preferred embodiments of the present invention, the base is part of the airflow inlet and at least part of the two opposing legs is part of the airflow outlet.

[0026] According to further preferred embodiments of the present invention, the airflow outlet comprises a first leg outlet part of the first leg and / or a second leg outlet part of the second leg. According to a further preferred embodiment, the airflow outlet comprises the first leg outlet part and the second leg outlet part. In such an embodiment, in operation, the fan creates two airflows a first airflow flowing from the base to the first leg outlet part and a second airflow flowing from the base to the second leg outlet part. More preferably, the separate airflows are created by the separation plate, for example by its shape, and redirected by the separation plate towards the respective first and second leg outlet part such as to further increase performance.

[0027] According to further preferred embodiments, the airflow outlet is formed by the first leg outlet part and the second leg outlet part. More preferably, the fan chamber is provided such as to, in operation, direct substantially the entire airflow through the airflow outlet. By limiting the airflow outlet to the first and the second leg outlet parts, it has been found that the performance of the heat pump can be further improved. More preferably, the surface of the outlet is smaller than the surface of the inlet, as this has been found to have a positive impact on the performance of the heat pump system. When the surface of the outlet is smaller than the surface of the inlet, the speed of the air leaving the outlet will be greater than the speed of the air entering the inlet, having a positive impact on the performance of the heat transfer pump.

[0028] According to further preferred embodiments of the present invention, the first leg comprises a first leg inlet part and the second leg comprises a second leg inlet part. The first leg inlet part and the second leg inlet part are part of the airflow inlet. In such configuration, in operation, the fan also creates airflows flowing from the first leg inlet part to the first leg outlet part and flowing from the second leg inlet part to the second leg outlet part. The airflows preferably are redirected with the preferred separation plate such as to further increase performance.

[0029] According to preferred embodiments of the present invention, the first leg inlet part and the second leg inlet part are adjacent to the base. Preferably, the first leg inlet part, the second leg inlet part and the base together form the airflow inlet.

[0030] According to further preferred embodiments, the first leg inlet part and the second leg inlet part are a curved section of the respective leg interconnecting a substantially straight section of the respective leg with the base, with, more preferably, the substantially straight sections forming the respective first leg outlet part and the second leg outlet part. Hence, the first leg is formed by a substantially first straight section and a first curved section, the substantially first straight section forming the first leg outlet part and the first curved section forming the first leg inlet part and the second leg is formed by a substantially second straight section and a second curved section, the substantially second straight section forming the second leg outlet part and the second curved section forming the second leg inlet part.

[0031] According to preferred embodiments of the present invention, the first and the second heat exchanger form a pair of a condenser and an evaporator. More preferably, the first heat exchanger is a condenser and the second heat exchanger is an evaporator. However, the first heat exchanger can also be the evaporator and the second heat exchanger the condenser. According, to further embodiments the heat pump system can even comprise a switch valve to switch the first heat exchanger between evaporator to condenser and, correspondingly, the second heat exchanger between condenser to evaporator.

[0032] According to preferred embodiments of the present invention, the heat pump system is enclosed by a housing, the housing comprising at least one opening to the fan chamber, the opening being part of the airflow outlet and / or the airflow inlet. The housing can comprise a top and / or a bottom plate. The opening can be provided in the top and / or the bottom of the housing. The opening, if part of the outlet, for example allows to reduce an undesired built up of pressure in the fan housing. By providing the opening in the bottom plate, preferably after the fan along direction of the airflow, undesired entering of water or filth can be prevented. According to preferred embodiments of the present invention, the invention relates to a swimming pool with the heat pump system according to the invention, wherein the swimming pool is provided for creating a water flow across the first heat exchanger, preferably such as to heat the water of the water flow.

[0033] The invention also relates to a method for operating the heat pump system according to the invention, wherein preferably the first heat exchanger is the condenser and the second heat exchanger is the evaporator, and wherein the heat pump system is used for heating water, preferably of a pool, across the first heat exchanger.

[0034] Brief description of the

[0035] The invention will be further explained by means of the following description and the appended figures.

[0036] Figure 1 shows a main view in perspective of an embodiment of a heat pump system according to the present invention.

[0037] Figure 2 shows the heat pump system according to figure 1 with its top removed.

[0038] Figure 3 shows a top view of the heat pump system according to figure 2.

[0039] Figure 4 indicates some airflows in the heat pump system according to figure 3 while in operation.

[0040] Description of the invention

[0041] The present invention will be described with respect to particular embodiments and with reference to certain drawings but the invention is not limited thereto but only by the claims. The drawings described are only schematic and are non-limiting. In the drawings, the size of some of the elements may be exaggerated and not drawn on scale for illustrative purposes. The dimensions and the relative dimensions do not necessarily correspond to actual reductions to practice of the invention.

[0042] Furthermore, the terms first, second, third and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. The terms are interchangeable under appropriate circumstances and the embodiments of the invention can operate in other sequences than described or illustrated herein.

[0043] Moreover, the terms top, bottom, over, under and the like in the description and the claims are used for descriptive purposes and not necessarily for describing relative positions. The terms so used are interchangeable under appropriate circumstances and the embodiments of the invention described herein can operate in other orientations than described or illustrated herein.

[0044] Furthermore, the various embodiments, although referred to as “preferred” are to be construed as exemplary manners in which the invention may be implemented rather than as limiting the scope of the invention.

[0045] Figure 1 shows a main view in perspective of an embodiment of a heat pump system 1 according to the present invention.

[0046] The heat pump system 1 shown in figure 1 comprises a housing 30 which comprises a top 2 in the form of a lid which can be removed so as to access several components of the heat pump system 1 . Further, the heat pump system 1 comprises a guard 3 for protecting an airflow inlet 4 and an airflow outlet 5. Further, the heat pump system 1 comprises a water flow inlet 6 and a water flow outlet 7. The water flow inlet 6 is provided to be connected to an inlet flow of water which can then, for example, be heated by the heat pump system 1 . The water flow inlet 6 can for example come from a pool which is not shown in the figures. The water flow outlet 7 is provided to provide an outlet flow of water, for example heated water, for example back to the pool such as to create a water flow provided to heat the water of the pool.

[0047] The heat pump system 1 is further enclosed by a back plate 9 of the housing 30 and a bottom plate 8 (better shown in figure 3) of the housing 30.

[0048] Usually the housing 30, more in particular the top 2, the bottom plate 8, the back plate 9 and the guard 3 are made from for example plastic and / or metal. Other materials deemed appropriate by the person skilled in the art are of course possible such as wood, etc. depending on the desired application and use of the heat pump system 1 .

[0049] Figure 2 shows the heat pump system 1 according to figure 1 with its top 2 removed. Figure 2 hence shows the inside of the heat pump system 1.

[0050] Figure 2 shows that the heat pump system 1 comprises a first heat exchanger 1 1 (better shown in figure 3), in this case a condenser, and a second heat exchanger 12, in this case an evaporator. Further, the heat pump system 1 comprises an expansion valve 13 and a compressor 14. The expansion valve 13 interconnects the outlet 16 of the first heat exchanger 11 and the inlet 17 of the second heat exchanger 12. The compressor 14 interconnects the inlet 15 of the first heat exchanger 1 1 and the outlet 18 of the second heat exchanger 12. As usual, a refrigerant, such as for example R32 is provided to be circulated along the first heat exchanger 1 1 , the second heat exchanger 12, the expansion valve 13 and the compressor 14.

[0051] A fan 19 of the heat pump system 1 is provided to, in operation, create an airflow through the second heat exchanger 12 and, in operation, suck air through the airflow inlet 4 and blow air through the airflow outlet 5, as shown in more detail in figure 4. A fan duct 20 is provided to avoid air from bypassing the fan.

[0052] Figure 2 further shows that the second heat exchanger 12 is in the form of a U-shaped surface 21 with two opposing legs 23, 24, a first leg 23 of the two opposing legs 23, 24 and a second leg 24 of the two opposing legs 23, 24. A base 22 interconnects the first 23 and the second leg 24.

[0053] Figure 2 further shows a fan chamber 25 which comprises the fan 19 and which is delimited by the first leg 23, the second leg 24 and the base 22 forming chamber walls 10.

[0054] Figure 2 further shows that the fan chamber 25 is further delimited by a separation plate 26. The separation plate 26 opposes the base 22 and the fan 19 is interposed between the base 22 and separation plate 26. The separation plate 26 interconnects the two opposing first and second legs 23, 24. As can be seen in figure 2, the separation plate 2 can thus further separate the airflows created by the fan 19 from further components of the heat pump system 1. For example, the separation plate 26 shields the condenser 1 1 , the expansion valve 13 and the compressor 14 from the airflows created by the fan 19, hence further improving the performance of the heat pump system 1 . The separation plate 26, also can shield at least one or more electronic components 28 from the airflows created by the fan 19. Preferably however, the electronic components 28 are provided with cooling fins 27 extending through the separation plate 26, the cooling fins 27, in operation, being cooled by airflows created by the fan 19.

[0055] Figure 2 further shows that the fan chamber 25 is further delimited by the top 2 and the bottom plate 8.

[0056] Figure 3 shows a top view of the heat pump system according to figure 2. Figure 3 thus shows an improved view of, for example, the location of the fan 19 with respect to the first and the second leg 23, 24 and the location of the airflow inlet 4 and the airflow outlet 5. Not all reference signs of the previous figures have been taken over.

[0057] Figure 3 further shows that the shown heat pump system 1 is provided with electronic connectors 29 for controlling the heat pump system 1.

[0058] Figure 3 shows more particularly that the U-shaped surface 21 conforms with the round shape of the fan 19. Further, it can be seen that the opposing legs 23, 24 are connected to the base 22 by curved sections 37, 38 of the opposing legs 23, 24 forming the U-shaped surface 21 . The curved sections 37, 38 have a radius of curvature substantially corresponding to the radius of the fan 19.

[0059] The fan 19 is positioned between the opposing legs 23, 24, more specifically, the fan 19 is positioned within a volume defined by the U- shaped surface 21. The fan 19 is symmetrically positioned between the opposing legs 23, 24, more specifically with its axis of rotation at the middle between the opposing legs 23, 24 and or with its axis of rotation at the middle of the height of the opposing legs 23, 24 and the base 22.

[0060] Figure 3 shows that first leg 23 and the second leg 24 both comprise an inlet part (the first leg 23 a first leg inlet part 31 and the second leg 24 a second leg inlet part 33) and an outlet part (the first leg 23 a first leg outlet part 32 and the second leg 24 a second leg outlet part 34). It can be seen that the first leg inlet part 31 and the second leg inlet part 33 are adjacent to the base 22.

[0061] Figure 4 indicates some airflows 35, 36 in the heat pump system 1 according to figure 3 while in operation. Not all reference signs of the previous figure have been taken over. The opening 43 present in the embodiment of figure 3 has been omitted from figure 4.

[0062] In operation, the fan chamber 25 enveloping the fan 19 is adapted such that in operation the fan 19 creates an airflow 35, 36 between and through the base 22 and at least part of the opposing legs 23, 24. Figure 4 shows in particular that a first airflow 35 extends between the base 22 and the first leg outlet part 32 and that a second airflow 36 extends between the base 22 and the second leg outlet part 34. Further, it is also shown that air 39, 40 is drawn from both first leg inlet part 31 towards the first airflow 35 and the second leg inlet part 33 towards the second airflow 36. The separation plate 26 is shaped such as to redirect the first airflow 35 to the first leg outlet part 32 and the second airflow 36 to the second leg outlet part 34. The first and second airflows 35, 36 in operation are drawn by the fan 19 through the base 22, the first leg inlet part 31 , the second leg inlet part 33, the first leg outlet part 32 and the second leg outlet part 34 where they can interact with the second heat exchanger 12 and change temperature accordingly.

[0063] Figure 4 shows that the first leg 23 is formed by a substantially first straight section 41 and a first curved section 37, the substantially first straight section 41 forming the first leg outlet part 32 and the first curved section 37 forming the first leg inlet part 31 and the second leg 24 is formed by a substantially second straight section 42 and a second curved section 38, the substantially second straight section 42 forming the second leg outlet part 34 and the second curved section 38 forming the second leg inlet part 33.

[0064] As shown in the figures 1 , 2 and 4, the airflow inlet 4 is hence formed by the base 22, the first leg inlet part 31 and the second leg inlet part 33 whereas the airflow outlet 5 is formed by the first leg outlet part 32 and the second leg outlet part 34. In operation, the top 2 and the bottom plate 8 will restrict the flow of air and direct the air to the first leg outlet part 32 and the second leg outlet part 34.

[0065] However, although not shown in all the figures, according to further embodiments, further inlets and or outlets could be provided. For example, the airflow inlet 4 could comprise air at least one inlet provided in the bottom plate 8 and / or the top 2 for example in the form of an opening, preferably the bottom plate 8 so as to avoid for example water or filth to enter the housing 30, and / or the airflow outlet 5 could comprise at least one air outlet, for example in the form of an opening, provided in the bottom plate 8 and / or the top 2, preferably the bottom plate 8 so as to avoid for example water or filth to enter the housing 30. The outlet provided in the bottom plate 8 and / or top 2 could for example reduce the risk of an undesired pressure built up in the housing 30. For example, as shown in figure 3, the bottom plate 8 can comprise at least one such opening 43 to the fan chamber 25, for example after the fan 19 along direction of the airflow, the opening 43 being part of the airflow outlet 5.

[0066] The embodiment shown in figures 1 , 2 and 4 has been found to have a relative good COP. A COP of 26,4 was for example obtained with an air temperature of 27°C, a water temperature of 26°C, a relative humidity of 80% where a heating power of 10,59kW was reached.

[0067] References

[0068] 1. Heat pump 23. First leg system 24. Second leg

[0069] 2. Top 25. Fan chamber

[0070] 3. Guard 35 26. Separation plate

[0071] 4. Airflow inlet 27. Cooling fins

[0072] 5. Airflow outlet 28. Electronic

[0073] 6. Waterflow inlet component

[0074] 7. Waterflow outlet 29. Electronic

[0075] 8. Bottom plate 40 connectors

[0076] 9. Back plate 30. Housing

[0077] 10. Fan chamber 31 . First leg inlet part walls 32. First leg outlet

[0078] 11. First heat part exchanger 45 33. Second leg inlet

[0079] 12. Second heat part exchanger 34. Second leg outlet

[0080] 13. Expansion valve part

[0081] 14. Compressor 35. First airflow

[0082] 15. Inlet first heaSO 36. Second airflow exchanger 37. First curved

[0083] 16. Outlet First heat section exchanger 38. Second curved

[0084] 17. Inlet second heat section exchanger 55 39. Air drawn through the

[0085] 18. Outlet second first leg inlet part 31 heat exchanger 40. Air drawn through the

[0086] 19. Fan Second leg inlet part 33

[0087] 20. Fan duct 41 . First straight section

[0088] 21 . U-shaped surface 42. Second straight section

[0089] 22. base 43. Opening Although aspects of the present disclosure have been described with respect to specific embodiments, it will be readily appreciated that these aspects may be implemented in other forms.

Claims

Claims1 . A heat pump system (1 ), comprising a first and a second heat exchanger (1 1 , 12), an expansion valve (13), a compressor (14) and a fan (19), wherein the second heat exchanger (12) is in the form of a U- shaped surface (21 ) with two opposing legs (23, 24), a first leg (23) of the two opposing legs and a second leg (24) of the two opposing legs, and a base (22) interconnecting the first (23) and the second (24) leg, wherein the U-shaped surface (21 ) forms fan chamber walls (10) delimiting a fan chamber (25) enveloping the fan (19), the fan chamber (25) being adapted such that in operation the fan (19) creates an airflow (35, 36) between and through the base (22) and at least part of the opposing legs (23, 24).

2. The heat pump system (1 ) according to the preceding claim, wherein the fan chamber (25) is further delimited by a separation plate (26) opposing the base (22) and interconnecting the first (23) and the second (24) leg.

3. The heat pump system (1 ) according to the preceding claim, wherein the separation plate (26) is formed such as to, in operation, direct the airflow (35, 36) towards the part of the opposing legs (23, 24).

4. The heat pump system (1 ) according to any one of the preceding claims, wherein the heat pump system (1 ) comprises an airflow inlet (4) and an airflow outlet (5) and the fan (19) is provided to, in operation, suck air through the airflow inlet (4) and blow air through the airflow outlet (5).

5. The heat pump system (1 ) according to the preceding claim, wherein the base (22) is part of the airflow inlet (4) and at least part of the two opposing legs (23, 24) is part of the airflow outlet (5).

6. The heat pump system (1 ) according to the preceding claim, wherein the airflow outlet (5) comprises a first leg outlet part(32) of the first leg (23) and / or a second leg outlet part (34) of the second leg (24).

7. The heat pump system (1 ) according to the preceding claim, wherein the first leg (23) comprises a first leg inlet part (31 ) and the second leg (24) comprises a second leg inlet part (33), wherein the first leg inlet part (31 ) and the second leg inlet part(33) are part of the airflow inlet (4).

8. The heat pump system (1 ) according to the preceding claim, wherein the first leg inlet part (31 ) and the second leg inlet part (33) are adjacent to the base (22).

9. The heat pump system (1 ) according to the preceding claim, wherein the first leg inlet part (31 ), the second leg inlet part (33) and the base (22) together form the airflow inlet (4).

10. The heat pump system (1 ) according to any one of the preceding claims, wherein the first and the second heat exchanger (11 , 12) form a pair of a condenser and an evaporator.1 1. The heat pump system (1 ) according to the previous claim, wherein the first heat exchanger (11 ) is a condenser and the second heat exchanger (12) is an evaporator.

12. The heat pump system (1 ) according to any one of the preceding claims, wherein the heat pump system (1 ) is enclosed by a housing (30), the housing (30) comprising at least one opening to the fan chamber (25), the opening being part of the airflow outlet (5) and / or the airflow inlet (4).

13. A swimming pool comprising the heat pump system (1 ) according to any one of the preceding claims, wherein the swimming pool is provided for creating a water flow across the first heat exchanger (1 1 ), preferably, preferably when at leastin combination with claim 11 , such as to heat the water of the water flow.

14. A method for operating the heat pump system (1 ) according to any one of the preceding claims, wherein the heat pump system (1 ) is used for heating water across the first heat exchanger (11 ).

15. The method for operating the heat pump system according to the preceding claim, wherein the heat pump is used for heating water of a pool.

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