Hydraulic module, heat pump comprising such a hydraulic module, and heating system comprising a heat pump with such a hydraulic module

Abstract

The invention relates to a hydraulic module, comprising a housing that is formed by at least a first and a second housing part that are joined together in a watertight manner and enclose a first chamber and a second chamber, wherein: - the hydraulic module comprises an insert that is arranged between the first and the second housing part, and that defines at least one of: - a baffle, that is arranged inside at least one of the first chamber and the second chamber to define a desired flow path in said chamber; and - a divider that divides a cavity into the first chamber and the second chamber. The invention further relates to heat pump comprising such a hydraulic module, and a heating system comprising a heat pump with such a hydraulic module.

Description

Title: Hydraulic module, heat pump comprising such a hydraulic module, and heating system comprising a heat pump with such a hydraulic module Description: The invention relates to a hydraulic module, comprising a housing that is formed by at least a first and a second housing part that are joined together in a watertight manner and enclose a first chamber and a second chamber. The invention further relates to heat pump comprising such a hydraulic module, and a heating system comprising a heat pump with such a hydraulic module. A hydraulic module is a module that is designed to guide one or more than one flow of a hydraulic fluid, and may serve different purposes. For example, a hydraulic module may serve as a module that replaces a variety of conduits by integrating these conduits in one module, thereby allowing for a compact module that is moreover easy to install. Also, the hydraulic module may provide an internal flow connection between one or more conduit of the variety of conduits, and thereby form an open manifold. Especially the combination of providing a variety of conduits and provided one or more than one internal flow connection between conduits of said variety of conduits allows for a hydraulic module that may be compact and provide a high level of integration of different functionalities. Such hydraulic modules are for example very useful to be integrated in domestic heat pumps, where overall dimensioning of the heat pump, ease of installation, and suitability for mass production, are a key considerations. An objective of the present invention is to provide a hydraulic module, that is improved relative to the prior art and wherein at least one of the above stated problems is obviated or alleviated. Said objective is achieved with the hydraulic module, comprising a housing that is formed by at least a first and a second housing part that are joined together in a watertight manner and enclose a first chamber and a second chamber, according to claim 1, wherein the hydraulic module comprises an insert that is arranged between the first and the second housing part, and that defines at least one of: - a baffle, that is arranged inside at least one of the first chamber and the second chamber to define a desired flow path in said chamber; and - a divider that divides a cavity into the first chamber and the second chamber. According the invention, an insert is used to allow the hydraulic module to have a relatively complex internal routing of fluid flows, while still being easy to manufacture, even in mass production. More in particular, the first and the second housing parts, that are joined together, may form one or more than one cavity. For example, the insert may define a divider that divides a cavity into the first chamber and the second chamber. Alternatively, or additionally, the insert may also define a baffle, that is arranged inside at least one of the first chamber and the second chamber to define a desired flow path in said chamber. The highest level of function integration may be obtained when the insert defines both such a divider and such a baffle at once. Although different manufacturing methods for producing the first housing part, the second housing part and the insert, may be envisaged, including additive manufacturing of at least one of these parts, it is remarked that assembling the hydraulic module as proposed according to the present invention, allows the individual parts to be designed such that they may also be produced by injection moulding. In this way, the hydraulic module may be made out of parts that are suitable for mass production, while the hydraulic module once the injection moulded parts are assembled may form a hydraulic module with integrated flow paths that as a whole would not be suitable to be manufactured via injection moulding. The use of an insert thus allows a high level of function integration and complexity to be obtained in a module that is still suitable for mass production. This is especially relevant if such a hydraulic module is to be used in combination with a domestic heat pump. According to a preferred embodiment of the hydraulic module, the first housing part, the second housing part and the insert are welded together at their interfaces to form an integrated part. In this way the different parts are securely bonded, guaranteeing a watertight bond. According to a preferred embodiment of the hydraulic module: - the first chamber comprises a main inlet and a secondary outlet; - the second chamber comprises a secondary inlet and a main outlet; the main inlet is configured to receive a central heating return flow; - the secondary outlet is configured to output a to be pre-heated flow towards a main heating device, preferably a heat pump; - the secondary inlet is configured to receive the pre-heated flow back from the main heating device; - the main outlet is configured to output a central heating forward flow; and - the second chamber is configured to, during use, allow the pre-heated flow that is received back from the main heating device to be heated further to a desired pre-determined temperature with an auxiliary heating device. The hydraulic module with the first and second chamber, and the respective inlets and outlets, provides a compact and highly integrated hydraulic module that is especially suitable to be applied in combination with a domestic heat pump as a main heating device. The second chamber allows a pre-heated flow, that is received back from the main heating device to be heated further with an auxiliary heating device, such as an electric heater that is arranged inside the hydraulic module, or an auxiliary heating device that is arranged outside the hydraulic module. Such an external auxiliary heating device may comprise one of a gas boiler, a further heat pump, an instantaneous water heater and a wood stove. According to a further preferred embodiment, the auxiliary heating device comprises an electric heater that is arranged inside the second chamber and that is configured to heat the pre-heated flow inside the second chamber to the desired pre-determined temperature. In this way, a heat pump may act as a main heating device, and in cases wherein the heating capacity of the heat pump is insufficient, the electric heater that is arranged inside the second chamber can be used to increase the temperature of the pre-heated flow that is received from the heat pump. According to a further preferred embodiment, the auxiliary heating device, that is configured to heat the pre-heated flow to the desired pre-determined temperature, is arranged outside the second chamber of the hydraulic module, and the second chamber comprises: - a further outlet that is configured to output the pre-heated flow towards the auxiliary heating device for further heating thereof; and - a further inlet that is configured to receive the heated flow back from the auxiliary heating device. For extreme situations, or in order to obtain a very versatile heating system, it may be envisaged that the auxiliary heating device comprises both an electric heater that is arranged inside the second chamber of the hydraulic module, and an auxiliary heating device, such as a gas boiler, a further heat pump, an instantaneous water heater and a wood stove, that is arranged outside the second chamber of the hydraulic module. The invention further relates to a heat pump, comprising a hydraulic module according to the invention, wherein: - the main inlet of the hydraulic module is configured to be connected to a central heating return flow; - the main outlet of the hydraulic module is configured to be connected to a central heating forward flow; - the secondary outlet of the hydraulic module is connected to an inlet of the heat pump; and - the secondary inlet of the hydraulic module is connected to an outlet of the heat pump. The invention furthermore relates to a heating system, comprising: - a heat pump according to the invention; and - a central heating circuit that is in flow connection with the main inlet and the main outlet of the hydraulic module. Preferred embodiments are the subject of the dependent claims. The various aspects and features described and shown in the specification can be applied, individually, wherever possible. These individual aspects, and in particular the aspects and features described in the attached dependent claims, may be an invention in its own right that is related to a different problem relative to the prior art. In the following description preferred embodiments of the present invention are further elucidated with reference to the drawing, in which: Figure 1 is a schematic view of a heating system comprising a heat pump with a hydraulic module according to the invention; Figure 2A is a schematic top view of the first chamber of the hydraulic module; Figure 2B is a schematic side view of the first chamber of the hydraulic module; Figure 3A is a schematic top view ofthe second chamber ofthe hydraulic module in a first heating mode, wherein an electric heater is used for auxiliary heating; Figure 3B is a schematic side view of the second chamber of the hydraulic module in the first heating mode; Figure 3C is a schematic top view of the second chamber ofthe hydraulic module in a second heating mode, wherein an external heating device is used for auxiliary heating, as an alternative to, or supplementary to, the electric heater of the first heating mode; Figure 3D is a schematic side view of the second chamber of the hydraulic module in the second heating mode; Figure 4 is an exploded perspective view of the hydraulic module according to the invention; Figure 5 is a perspective view of the hydraulic module of Figure 4 from above; Figure 6 is a perspective view of the hydraulic module of Figure 4 from below; Figure 7 is a top view of the hydraulic module; Figure 8 is a cross sectional side view of the hydraulic module in section plane B-B through the first chamber; Figure 9 is a cross sectional side view of the hydraulic module in section plane C-C through the second chamber; Figure 10 is a side view of the hydraulic module; Figure 11 is a cross sectional top view of the hydraulic module in section plane A-A; and Figure 12 is a perspective view of the second housing part from below. The heating system 1 of Figure 1 comprises a heat pump 5 and a hydraulic module 2. Although any type of heat pump 5 may be used, the exemplary embodiment comprises a domestic indoor exhaust air heat pump 6 that is configured to extract heat from exhaust air of an indoor ventilation system. Exhaust air of an indoor ventilation system, hereafter also referred to as exhaust air", may form a very interesting heat source for a heat pump, because such exhaust air has a relatively high energy density, and would otherwise by expelled from the building as waste. In most countries, legislation requires ventilation of buildings, such as residential buildings and office spaces. Using an exhaust air heat pump allows at least a part of the thermal energy to be recovered, before it is allowed to leave the building. In this way, energy is recovered that would otherwise be wasted via the obligatory ventilation system. However, because such an indoor exhaust air heat pump 6 is arranged inside a building, the dimensioning of the heat pump is a key consideration. Although not essential for the functionality, the desire to have a compact overall design led to choice for the shown embodiment to integrate the hydraulic module 2 inside the casing 11 of the heat pump 5. The heat pump 5 comprises an exhaust air inlet 5-1 and an exhaust air outlet 5-2. Using a fan 6, a flow E of exhaust air is forced over a primary heat exchanger 7, where heat is extracted from the exhaust air. The compressor 8 causes a flow to a secondary heat exchanger 9, where the heat may be transferred to an auxiliary heating circuit 10, that will be explained in more detail below. The hydraulic module 2 comprises a housing 12 that is formed by at least a first housing part 36 and a second housing part 37 that are joined together in a watertight manner and enclose a first chamber 3 and a second chamber 4. According to the invention, the hydraulic module 2 comprises an insert 18 that is arranged between the first 36 and the second housing part 37. The insert 18 defines at least one of: - a baffle 19, that is arranged inside at least one of the first chamber 3 and the second chamber 4 to define a desired flow path in said chamber 3, 4; and - a divider 20 that divides a cavity 21 into the first chamber 3 and the second chamber 4. The exemplary embodiment shown in Figure 4 comprises two inserts 18, 181, 182 in order to elucidate the functionality of the baffle 19 and the divider 20 independently of each other. It is however explicitly mentioned that the insert 18-1 and the insert 18-2 can also be integrated to form a single insert 18. In the shown embodiment, insert 18, 182 defines a divider 20 that divides the cavity 21 into two separate chambers 3, 4. It is however also conceivable that the housing parts 36, 37 are designed such that they already define two separate chambers 3, 4, without the need for an insert 18, 18-2. The insert 18, 18-1 of the shown embodiment defines a baffle 19, that is arranged inside the first chamber 3 to define a desired flow path in said first chamber 3. The schematic top view of Figure 2A and the schematic side view of Figure ZB show the first chamber 3 and the flow path of fluid from a main inlet 3-1 towards a secondary outlet 3-2. Although the first chamber 3 and the second chamber 4 will be discussed in more detail below, it is clear from the flow path shown in Figures 2A, ZB that it would not be possible to make the hydraulic module 2 out of two injection moulded housing parts 36, 37. However, by using one or more than one insert 18, 181, 182, it is possible to allow the hydraulic module 2 to have a relatively complex internal routing of fluid flows, while still being easy to manufacture, even in mass production, especially via (but not limited to) injection moulding. The use of one or more than one insert 18, 18-1, 182 thus allows a high level of function integration and complexity to be obtained in a hydraulic module 2 that is still suitable for mass production. This is especially relevant if such a hydraulic module 2 is to be used in combination with a domestic heat pump 5. As can be seen in Figures 2A, ZB, 8 and 11, the first chamber 3 is an elongate chamber having a longitudinal direction L3 (Figure ZA), and the insert 8, 81 defines the baffle 19 that extends in said longitudinal direction inside said first chamber 3 till a longitudinal offset 27 from an inner wall 28 of said chamber 3, to thereby define a forward flow path F3-F and a return flow path F3-R that extend opposite relative to each other in said longitudinal direction. The forward flow path F3-F and the return flow path F3-R are directed opposite to each other. Their length, including the 180° bend around the edge of the baffle 19 that reverses the flow, allow the flow to become a laminar flow. The hydraulic module 2 further comprises a flow sensor 29 that is arranged in the return flow path F3-R of the first chamber 3. Because of the laminar flow, the accuracy of the flow measured by the flow sensor 29 is improved. The first housing part 36, the second housing part 37 and the one or more than one insert 18, 18-1, 182 are preferably welded together at their interfaces to form an integrated part. In this way the different parts are securely bonded, guaranteeing a watertight bond. This welding process may be done by e.g. friction welding, vibration welding, ultrasonic welding, or laser welding, may be used to weld the parts together. With reference to Figure 1, the heating system 1, and in particular the hydraulic module 2 thereof, are now explained in more detail. The first chamber 3 of the hydraulic module 2 comprises a main inlet 3- 1 and a secondary outlet 3-2. The second chamber 4 of the hydraulic module 2 comprises a secondary inlet 4-1 and a main outlet 4-2. The main inlet 3-1 of the first chamber 3 is configured to receive a central heating return flow CH-R, that is pumped by a pump 17. The secondary outlet 3-2 of the first chamber 3 is configured to output a to be pre-heated flow towards a main heating device 13. In the shown embodiment, the heat pump 5 defines the main heating device 13. The secondary inlet 4-1 of the second chamber 4 is configured to receive the pre-heated flow back from the main heating device 13, i.e. heat pump 5. The main outlet 4-2 of the second chamber 4 is configured to output a central heating forward flow CH-F, and the second chamber 4 is configured to, during use, allow the pre-heated flow that is received back from the main heating device 13 to be heated further to a desired pre-determined temperature with an auxiliary heating device 14. As shown in Figure 1, the main inlet 3-1 of the hydraulic module 2 is configured to be connected to a central heating return flow CH-R, the main outlet 42 of the hydraulic module 2 is configured to be connected to a central heating forward flow CH-F, in order to provide heat to a central heating system 15. The central heating system 15 comprises one or more than one radiator 16 and a pump 17. Pump 17 causes a flow through the central heating circuit 18 that is in flow connection with the main inlet 3-1 and the main outlet 4-2 of the hydraulic module 2. In the shown embodiment, pump 17 is connected to the hydraulic module 2 and positioned directly downstream of the main inlet 3-1. For illustrative simplicity, the pump 17 is shown upstream of the hydraulic module 2 in the schematic representation of Figure 1, which could also be a working alternative. A pressure sensor 45 is configured to measure a pressure inside the first chamber 3. The secondary outlet 3-2 of the hydraulic module 2 is connected to an inlet 5-3 of the heat pump 5, and the secondary inlet 4-1 of the hydraulic module 2 is connected to an outlet 54 of the heat pump 5. As mentioned above, the second chamber 4 of the hydraulic module 2 is configured to, during use, allow the pre-heated flow that is received back from the main heating device 13 to be heated further to a desired pre-determined temperature with an auxiliary heating device 14. Thus, if the main heating device 13 is an indoor exhaust air heat pump 5, and the exhaust air of the indoor ventilation system alone is insufficient to meet the heating demand, further heating may be obtained with an auxiliary heating device 14. Such an auxiliary heating device 14 may be an electric heater 21 that is arranged inside the hydraulic module 2, and / or an auxiliary heating device 26 that is arranged outside the hydraulic module 2. Both version of auxiliary heating devices 14, 21, 26 are now discussed in more detail. According to a first heating mode, the auxiliary heating device 14 may comprise an electric heater 21 that is arranged inside the second chamber 4 and that is configured to heat the pre-heated flow inside the second chamber 4 to the desired pre-determined temperature. The electric heater 21 is shown in detail in Figure 4, and comprises a heating coil 22 that extends on both sides of a baffle plate 23. The baffle plate 23 creates forward flow F4-F and return flow F4-R inside the second chamber 4, and thereby guarantees that the fluid flows along substantially the whole length of the heating coil 22. This allows the heating coil 22 of the electric heater 21 to further heat the fluid that was pre-heated by the main heating device 13, such as the heat pump 5. As can be seen in Figures 3A, 3B, 3C, 3D, 9 and 11, the second chamber 4 is elongate and extends in a longitudinal direction L4 (Figures 3A and 3C). The electric heater 21 is elongate and extends in the longitudinal direction L4 inside the second chamber 4. In the shown embodiment, the first chamber 3 and the second chamber 4 extend parallel to each other, and their longitudinal directions L3 and L4 are parallel to each other. The electric heater Z1 extends in the longitudinal direction L4 inside the second chamber 4 till a longitudinal offset 30 from an inner wall 31 of said second chamber 4 and comprises a further baffle 23 to thereby define a forward flow path F4- F and a return flow path F4-R that extend opposite relative to each other in said longitudinal direction L4 in said second chamber 4. The hydraulic module 2 further comprises a temperature sensor 32 that is arranged near the main outlet 4-2, and more preferably in the return flow path F4-R of the second chamber 4. Figure 11 shows that the hydraulic module 2 comprises one or more than one flow guide 33 to promote a turbulent flow in the return flow path F4-F in the second chamber 4. A turbulent flow mixes to promote a uniform temperature distribution, and thereby increases the measurement accuracy of the temperature sensor 32. In the shown embodiment, the one or more than one flow guide 33 is arranged on an inner wall 34 of the return flow path F4-R. According to a second heating mode, that is shown in Figures 30 and 3D, the auxiliary heating device 14, that is configured to heat the pre-heated flow to the desired pre-determined temperature, is arranged outside the second chamber 4 of the hydraulic module 2, and the second chamber 4 comprises: - a further outlet 4-4 that is configured to output the pre-heated flow towards the auxiliary heating device 14 for further heating thereof; and - a further inlet 4-3 that is configured to receive the heated flow back from the auxiliary heating device 14. The second chamber 4 now defines an open manifold 24. Such an open manifold 24 allows the pre-heated fluid inside the second chamber 4 to be drawn out of the second chamber 4 of the hydraulic module 2 by an independent pump 25 of the auxiliary heating device 14, 26. This auxiliary heating device 14,26 may comprise one of a gas boiler, a further heat pump, an instantaneous water heater and a wood stove. Once heated further by the externally arranged auxiliary heating device 14, 26, the return flow enters the second chamber 4 at the further inlet 4-3, and the open manifold allows for a mixing ofthe pre-heated fluid inside the second chamber 4, and the heated return flow. Itis emphasized that the hydraulic module 2 may be operated in the first heating mode that applies the electric heater 21 as auxiliary heating device 14 (Figures 3A and 3B), in the second heating mode that applies an external heating device 26 as auxiliary heating device (Figures 30 and 3D), or a combination thereof. To elucidate that the combination of the first heating mode and the second heating mode is also possible, the embodiment of Figures 3C and 3D also comprises the electric heater 21. If the hydraulic module 2 is to be run in the second heating mode only, it is possible that the electric heater 21 is absent from the second chamber 4. In this case, the second chamber 4 may comprise an opening 35 that may be closed off with a (not shown) removable cover that allows the electric heater 21 to be arranged in retrofit. Figure 4 shows how the electric heater 21 is arranged through the opening 35. This allows a user to use a heat pump 5 via the hydraulic module 2 with a conventional gas boiler at this stage, while having the flexibility to switch to an electric alternative with the electric heater 21 in the future. Figures 9 and 12 show that the second chamber 4 comprises, in an orientation during use, an upward extending space 38 that is configured to collect air A that is present in the hydraulic module 2. As long as there is a flow in the second chamber 4, any air bubbles are transported to near the main outlet 4-2. As air rises inside a liquid flow, the air A is collected in the upward extending space 38. As long as the flow in the second chamber 4 continuous, the air A remains trapped inside said space 38. However, as soon as the flow stops, the air A may pass via the arrow B through a bypass channel 39 towards the secondary inlet 4-1, that may now serve to allow the air A to escape out of the hydraulic module 2. This bypass channel 39 that is configured to allow the air A to escape from the upward extending space 38 to the secondary inlet 4-1 is shown in Figure 12, that shows a perspective view of the second housing part 37 from below. Because the upward extending space 38 is arranged near the temperature sensor 32 and extends to a higher level than the temperature sensor 32, it is prevented that any accumulated air A prevents the temperature sensor 32 from measuring the temperature of the water inside the second chamber 4 of the hydraulic module 2. In the exemplary embodiment shown in Figure 6, the main inlet 3-1, the main outlet 4-2, the further inlet 4-3 and the further outlet 4-4 are arranged next to each other. According to a preferred embodiment, at least two, and preferably all, of the main inlet 3-1, the main outlet 4-2, the further inlet 4-3 and the further outlet 4-4 share a common locking device 40. In the shown embodiment, the locking device 40 comprises a slider 41 that is slidable (in the direction indicated with arrow S) between an unlocked state, allowing conduits to be connected to the inlets 3-1, 4-3 and outlets 4-2, 4-4, and a locked state, wherein the conduits are clamped around the respective inlets 3-1, 4-3 and outlets 4-2, 4-4. The slider 41 comprises an arm 42 that extends outward relative to the hydraulic module 2. This arm may serve to slide the slider 41, but may also provide a safety measure. In a preferred embodiment, a casing 11 of the heat pump 5 can only be closed when the slider 41 is in the locked state. Likewise, the secondary outlet 3-2 and the secondary inlet 4-1 may also share a common locking device 42, that is embodied as a slider 43 with an arm 44. It is conceivable that the hydraulic module 2 may only fit inside the casing when the slider 43 is in the locked state, thereby guaranteeing a secure clamping of the conduits that connect the hydraulic module with the heat pump 5. The above described embodiment is intended only to illustrate the invention and not to limit in any way the scope of the invention. Accordingly, it should be understood that where features mentioned in the appended claims are followed by reference signs, such signs are included solely for the purpose of enhancing the intelligibility of the claims and are in no way limiting on the scope of the claims. The scope of protection is defined solely by the following claims.

Claims

1. Hydraulic module, comprising a housing formed by ten at least a first and a second housing part connected to each other in a watertight manner are connected and enclose a first chamber and a second chamber, where: - the hydraulic module includes an insert that is between the first and the second housing part has been fitted, and that defines at least one of: - a partition installed in at least one of the first chambers and the second chamber to define a desired flow path in the chamber; and - a divider that divides a cavity into the first chamber and the second room.

2. Hydraulic module according to claim 1, where the first housing part, the second housing part and the insert joined together at their interfaces are welded to form an integrated part.

3. Hydraulic module according to claim 2, where: - the first chamber comprises a main inlet and a secondary outlet; - the second chamber comprises a secondary inlet and a main outlet; - the main inlet is configured to receive a return flow of the central heating; - the secondary exhaust is configured for discharging a for heating flow to a main heating device, preferably a heat pump; - the secondary inlet is configured to receive back the preheated flow from the main heating system; - the main inlet is configured for discharging a forward power from a central heating system; and - the second room is configured for the possible, during use cause the preheated flow that is received back from the main heating system can be further heated to a desired preset specific temperature with an auxiliary heating device.

4. Hydraulic module according to claim 3, where the auxiliary heating device includes an electric heater that in the second room is installed and is configured for heating the preheated Current in the second chamber to the desired preset temperature.

5. Hydraulic module according to claim 3 or 4, where the auxiliary heating device, which is configured for heating the preheated stream to the desired preset temperature, outside the the second chamber of the hydraulic module has been installed, and the second chamber includes: - a further outlet configured for discharging the preheated flow to the auxiliary heating device for further heating thereof; and - a further inlet configured to receive back the heated flow from the auxiliary heating device.

6. Hydraulic module according to conclusion 5, where the second chamber is open distributor defines.

7. Hydraulic module according to claim 5 or 6, where the auxiliary heating installation one comprises a gas boiler, a further heat pump, a tankless water heater and a wood stove.

8. Hydraulic module according to one of the preceding claims, whereby the The first chamber is an elongated chamber with a longitudinal direction, and the insert the shot defines that extends longitudinally in the first chamber to a longitudinal spacing from an inner wall of the room, in such a way that a to define a forward flow path and a return flow path that extending in opposite directions relative to each other in the longitudinal direction.

9. Hydraulic module according to claim 8, where the hydraulic module furthermore includes a flow sensor that is installed in the return flow path of the first chamber.

10. Hydraulic module according to one of claims 4-9, where: - the second chamber is elongated and extends in a longitudinal direction; and - the electric heater is elongated and extends lengthwise into the House of Representatives extends.

11. Hydraulic module according to claim 10, where the electric heating extends lengthwise in the second chamber to a longitudinal distance from an inner wall of the second room and a further bulkhead comprises to define a forward flow path and a return flow path such that extend opposite to each other in the longitudinal direction in the second room.

12. Hydraulic module according to one of the preceding conclusions, whereby the The hydraulic module furthermore includes a temperature sensor located near the main exhaust has been installed.

13. Hydraulic module in accordance with claims 11 and 12, where the A temperature sensor is installed in the return flow path of the second chamber.

14. Hydraulic module pursuant to one of the preceding claims, comprising one or more current conductors to create a turbulent flow in the to promote the return flow path.

15. Hydraulic module according to one of the preceding conclusions, whereby the second chamber, in an orientation during use, an upward-extending includes space that is configured for collecting air present in the hydraulic module.

16. Hydraulic module in accordance with one of the preceding claims 12-15, whereby the upward-extending space near the temperature sensor is installed and extends to a higher level than the temperature sensor.

17. Hydraulic module pursuant to claim 15 or 16, further comprising a bypass duct configured to allow air to escape from the space extending upwards to the secondary inlet.

18. Hydraulic module according to one of the preceding conclusions, whereby the the first chamber and the second chamber extend parallel to each other.

19. Hydraulic module in accordance with one of the preceding claims 4-18, where the second chamber includes an opening with a removable lid that makes it possible makes it possible to retrofit the electric heating applied 20. Hydraulic module according to one of the preceding claims 5-19, whereby the main intake, the main exhaust, the further intake and the further exhaust side by side have been installed.

21. Hydraulic module in accordance with claim 20, where at least two, and at preferably all, of the main intake, the main outlet, the further intake and the further exhaust share a common locking device.

22. Hydraulic module according to claim 21, where the locking device comprises a slide that slides between an unlocked state, which makes it possible enables pipes to be connected to the inlets and outlets, and a locked state, whereby the pipes around the respective inlets and outlets are clamped.

23. Hydraulic module according to claim 22, where the slide comprises an arm which extends outwards relative to the hydraulic module.

24. Heat pump, comprising a hydraulic module according to one of the previous conclusions, where: - the main inlet of the hydraulic module is configured to be connected to a return flow of the central heating; - the main outlet of the hydraulic module is configured to be connected to a forward flow of the central heating; - the secondary outlet of the hydraulic module is connected to an inlet of the heat pump; and - the secondary inlet of the hydraulic module is connected to an outlet of the heat pump.

25. Heat pump in accordance with claim 24, where the heat pump comprises: - a hydraulic module in accordance with one of claims 21-23; and - a housing that can only be closed when the slide is in the is in a locked state.

26. Heating system, comprising: - a heat pump according to conclusion 24 or 25; and - a central heating circuit that is in flow connection with the main inlet and the main outlet of the hydraulic module. 1 / 71151617 20CH-RCH-FFig.15-2 7 5.13 5-111E6895-33-2121831920105-44-1244-34-24-414.26 Fig.2AFig.2B2 19 F3-F F3-R 3-2 3-127CH-R2719 F3-F F3-R 3-2 3-1CH-RL32 / 7 4-44-24-3Fig.3AFig.3B3 / 73030L4F4-F 4-1 4-414,2123 22 F4-R 4-3 4-2F4-F 4-1 14,2123 22 F4-R4-44-24-3Fig.3CFig.3D3030L4F4-F 4-1 4-414,21F4-F 4-1 14,2123 22 F4-R 4-3 4-223 22 F4-R2424 4 / 7 18,18-1,19 18,18-2,20 23 30 35 14,21 22 Fig. 4 5 / 7 37 29 32 4-1 3-2 17 42,43,44 Fig. 5 40,41,42 40,41 17 42 4-2 3-1 4-3 4-4 36 37 Fig. 6 Fig.9Fig.7Fig.86 / 737 39 17 42364,2123 224-3 4-24027 19 37 1732836CB37 29CB17 424-24-132 Fig.12Fig.10Fig.117 / 7AA37 17 4236403-14-44-34-23614,21 23 34 3337AB4-1383933

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