Buffer heating water tank and heat pump system

Abstract

The embodiment of the utility model provides a buffer heating water tank and a heat pump system.The buffer heating water tank comprises a tank body and a heating assembly; the box body is provided with a heat compensation cavity and a buffer cavity which are separated from each other, a first water inlet and a first water outlet which are respectively communicated with the heat compensation cavity, and a second water inlet and a second water outlet which are respectively communicated with the buffer cavity; the heating assembly comprises a first heating piece used for heating the heat compensation cavity. According to the buffer heating water tank, the overall size is relatively small, and the occupied installation space is relatively small.

Description

Technical Field

[0001] This application relates to the field of heat pump technology, and in particular to a buffer heating water tank and a heat pump system. Background Technology

[0002] In related technologies, for some heat pump systems used in colder regions, an electric heating device is usually installed on the outlet side of the heat pump unit, and a buffer water tank is installed on the inlet side. However, the overall size of the electric heating device and the buffer water tank is relatively large, occupying a lot of installation space. Utility Model Content

[0003] In view of this, embodiments of this application aim to provide a buffer heating water tank and heat pump system with a relatively small overall size.

[0004] To achieve the above objectives, one embodiment of this application provides a buffer heating water tank, comprising:

[0005] The housing has a heat replenishment chamber and a buffer chamber separated from each other, a first water inlet and a first water outlet respectively connected to the heat replenishment chamber, and a second water inlet and a second water outlet respectively connected to the buffer chamber.

[0006] A heating assembly, the heating assembly including a first heating element for heating the heat-replenishing cavity.

[0007] In one embodiment, the first heating element is a first electric heating tube disposed in the heat replenishment cavity.

[0008] In one embodiment, the heating assembly includes a second heating element for heating the buffer cavity.

[0009] In one embodiment, the second heating element is a second electric heating tube disposed in the buffer cavity.

[0010] In one embodiment, the housing has a first water inlet communicating with the heat replenishment chamber; and / or,

[0011] The housing has a second water inlet that communicates with the buffer cavity.

[0012] In one embodiment, the buffer heating water tank includes a first safety valve disposed in the tank body, the first safety valve being used to connect the heating chamber to the external environment; and / or,

[0013] The buffer heating water tank includes a second safety valve disposed in the tank body, the second safety valve being used to connect the buffer chamber to the external environment.

[0014] In one embodiment, the buffer heating water tank includes a temperature detection device that extends into one of the buffer chamber and the reheating chamber.

[0015] Another embodiment of this application provides a heat pump system, including:

[0016] A heat pump unit, wherein the heat pump unit has a main unit water inlet and a main unit water outlet;

[0017] The end has a water inlet and a water outlet;

[0018] Circulation piping;

[0019] The buffer heating water tank, the heat pump host, and the terminal are arranged on the circulation pipeline. The first water inlet and the first water outlet of the tank are respectively connected to the water outlet of the host and the water inlet. The second water inlet and the second water outlet of the tank are respectively connected to the water outlet and the water inlet of the host.

[0020] In one embodiment, there are multiple terminals connected in parallel, and the water inlet of each terminal is connected to the first outlet of the housing, and the water outlet of each terminal is connected to the second inlet of the housing.

[0021] In one embodiment, the heat pump system includes a control component disposed in the heat pump host and signal-connected to the first heating component, for controlling the opening and closing of the first heating component according to the temperature of the heat replenishment cavity.

[0022] In one embodiment, the terminal includes at least one of a fan coil unit, a radiator, a floor heating coil, and a domestic water tank.

[0023] This application provides a buffer heating water tank and a heat pump system. The buffer heating water tank of this application provides a buffer chamber and a heat replenishment chamber that are separated from each other in the tank body, and a second heating element that heats the buffer chamber. This allows the buffer heating water tank to have both auxiliary heating and buffering functions. Compared with the method of setting both electric heating device and buffer water tank in related technologies, the overall size of the buffer heating water tank is relatively small and the installation space occupied is also relatively small. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a heat pump system according to an embodiment of this application;

[0025] Figure 2 for Figure 1 The diagram shown is a structural schematic of the buffer hot water tank.

[0026] Figure 3 This is a first control flowchart of a heat pump system according to an embodiment of this application;

[0027] Figure 4 This is a second control flowchart of a heat pump system according to an embodiment of this application;

[0028] Figure 5 This is a third control flowchart of the heat pump system according to an embodiment of this application;

[0029] Figure 6 This is a fourth control flowchart of a heat pump system according to an embodiment of this application.

[0030] Explanation of reference numerals in the attached figures:

[0031] 10. Buffer heating water tank; 11. Tank body; 11a. Heat replenishment chamber; 11b. Buffer chamber; 11c. First water inlet; 11d. First water outlet; 11e. Second water inlet; 11f. Second water outlet; 11g. First water supply port; 11h. Second water supply port; 11i. First drain outlet; 11j. Second drain outlet; 12. Heating component; 121. First heating element; 122. Second heating element; 13. First safety valve; 14. Second safety valve; 15. Temperature detection device; 20. Heat pump main unit; 20a. Main unit water inlet; 20b. Main unit water outlet; 30. Terminal; 30a. Water inlet; 30b. Water outlet; 31. Fan coil unit; 32. Radiator; 33. Underfloor heating coil; 40. Circulation pipeline; 41. Circulation pump; 70. Second water pipe; 80. Second automatic water supply valve. Detailed Implementation

[0032] This application provides a heat pump system; please refer to [link / reference]. Figure 1 and Figure 2 The heat pump system includes: a buffer heating water tank 10, a heat pump main unit 20, a terminal unit 30, and a circulation pipeline 40.

[0033] Please see Figure 1 and Figure 2 The buffer heating water tank 10 in this embodiment of the application includes a tank body 11 and a heating component 12.

[0034] The housing 11 has a heat replenishing chamber 11a and a buffer chamber 11b separated from each other, a first water inlet 11c and a first water outlet 11d respectively connected to the heat replenishing chamber 11a, and a second water inlet 11e and a second water outlet 11f respectively connected to the buffer chamber 11b. The heating assembly 12 includes a first heating element 121 for heating the buffer chamber 11b.

[0035] The heat pump unit 20 has a main unit water inlet 20a and a main unit water outlet 20b, and the terminal 30 has a water inlet 30a and a water outlet 30b.

[0036] Please see Figure 1The buffer heating water tank 10, the heat pump main unit 20, and the terminal 30 are installed on the circulation pipeline 40. The first water inlet 11c and the first water outlet 11d of the tank body 11 are respectively connected to the main unit water outlet 20b and the water inlet 30a and water outlet 30b. That is, the first water inlet 11c of the tank body 11 is connected to the main unit water outlet 20b of the heat pump main unit 20, and the first water outlet 11d of the tank body 11 is connected to the water inlet 30a of the terminal 30. The refrigerant of the heat pump main unit 20 flows into the circulation pipeline 40 from the main unit water outlet 20b, then enters the heat replenishment chamber 11a from the first water inlet 11c, and then flows into the circulation pipeline 40 from the first water outlet 11d, and enters the terminal 30 from the water inlet 30a.

[0037] The circulation pipe 40 is a pipe that circulates water between the heat pump main unit 20 and the terminal unit 30. Specifically, water enters the heat pump main unit 20 from the main unit inlet 20a for heat exchange. After heat exchange, the water flows out from the main unit outlet 20b and flows along the circulation pipe 40 to the water inlet 30a of the terminal unit 30. The water then enters the terminal unit 30 from the water inlet 30a and flows out from the water outlet 30b of the terminal unit 30. It then flows along the circulation pipe 40 back to the main unit inlet 20a of the heat pump main unit 20, thereby realizing the circulation of water between the heat pump main unit 20 and the terminal unit 30.

[0038] To facilitate water flow along the circulation pipe 40, please refer to the example. Figure 1 A circulation pump 41 for driving water flow can also be installed on the circulation pipeline 40.

[0039] Depending on actual needs, one or more terminals 30 can be installed. Different types of terminals 30 can be used for different heat pump systems to achieve different purposes. For example, please refer to [link to relevant documentation]. Figure 1 The terminal 30 may include at least one of the following: fan coil unit 31, radiator 32, floor heating coil 33, and domestic water tank (not shown in the figure).

[0040] Please continue reading. Figure 1 and Figure 2 Water flowing from the main unit outlet 20b of the heat pump main unit 20 flows into the circulation pipe 40, then enters the heat replenishment chamber 11a from the first inlet 11c, and subsequently flows into the circulation pipe 40 from the first outlet 11d, and then into the terminal 30 from the water inlet 30a. Water flowing from the water outlet 30b of the terminal 30 flows into the circulation pipe 40, then enters the buffer chamber 11b from the second inlet 11e, and subsequently flows into the circulation pipe 40 from the second outlet 11f, and then enters the heat pump main unit 20 from the main unit inlet 20a.

[0041] The supplementary heating chamber 11a is used to cooperate with the first heating element 121 to provide auxiliary heating for the water flowing out of the heat pump host 20 and into the supplementary heating chamber 11a. This can further increase the temperature of the water after heat exchange when the ambient temperature is low, so as to ensure that the temperature of the water flowing into the end 30 will not affect the heating effect due to the low temperature.

[0042] The type of the first heating element 121 is not limited; for example, please refer to [link to relevant documentation]. Figure 1 and Figure 2 The first heating element 121 can be a first electric heating tube disposed in the heat replenishment cavity 11a. In another embodiment, the first heating element 121 can also be a PTC (Positive Temperature Coefficient) heater.

[0043] The buffer chamber 11b is used for water storage. By storing water, the pressure and flow rate of the water in the heat pump system can be balanced. When the pressure of the heat pump system increases, part of the water from the circulation pipe 40 is stored in the buffer chamber 11b. When the pressure of the heat pump system decreases, the water stored in the buffer chamber 11b re-enters the circulation pipe 40, thereby maintaining the balance of the heat pump system.

[0044] Please see Figure 1 In an embodiment with multiple terminals 30, the multiple terminals 30 can be connected in parallel, and the water inlet 30a of each terminal 30 is connected to the second outlet 11f of the housing 11, and the water outlet 30b of each terminal 30 is connected to the first inlet 11c of the housing 11.

[0045] In related technologies, heat pump systems typically have an electric heating device installed on the outlet side of the heat pump unit to provide auxiliary heating for the water flowing out of the heat pump unit. At the same time, a buffer water tank is installed on the inlet side of the heat pump unit. The electric heating device and the buffer water tank are installed separately. Since the overall size of the electric heating device and the buffer water tank is relatively large, the electric heating device and the buffer water tank occupy a lot of installation space.

[0046] The buffer heating water tank 10 of this embodiment has a heat replenishing chamber 11a and a buffer chamber 11b arranged inside the tank body 11. The heat replenishing chamber 11a and the buffer chamber 11b are separated from each other. At the same time, the water in the heat replenishing chamber 11a is heated by the first heating element 121, thereby providing auxiliary heating for the water flowing out of the heat pump host. In other words, the buffer heating water tank 10 of this embodiment has both the auxiliary heating function of the electric heating device and the buffering function of the buffer water tank. Compared with the method of setting the electric heating device and the buffer water tank separately in the related technology, the overall size of the buffer heating water tank 10 of this embodiment is relatively small, and the installation space occupied is also relatively small.

[0047] In one embodiment, please refer to Figure 2 The heating assembly 12 may include a second heating element 122 for heating the buffer chamber 11b. The second heating element 122 can heat the water in the buffer chamber 11b.

[0048] The type of the second heating element 122 is not limited. For example, the second heating element 122 can be a second electric heating tube disposed in the buffer cavity 11b. In another embodiment, the second heating element 122 can also be a PTC (Positive Temperature Coefficient) heater.

[0049] In low-temperature environments, especially when the heat pump system is started after a long period of shutdown, the water temperature and pressure in the heat pump system are low. When the compressor of the heat pump host 20 starts, it is difficult to establish a pressure difference between the suction and discharge in a short period of time. At the same time, the temperature of the compressor oil sump is also low, resulting in poor lubrication, which may affect the operation of the compressor. Therefore, by setting a second heating element 122 to heat the buffer chamber 11b, the compressor can quickly establish a pressure difference, raise the temperature of the compressor body, and drive the oil sump to raise the temperature, thereby improving the reliability of the compressor.

[0050] When the heat pump host 20 is shut down, in order to prevent water from freezing in a low-temperature environment, at least one of the first heating element 121 and the second heating element 122 can be turned on to heat the water flow in the heat replenishment chamber 11a and / or the buffer chamber 11b. Then, the circulating water pump is turned on to make the water flow circulate in the heat pump system, thereby achieving the antifreeze effect.

[0051] In one embodiment, please refer to Figure 1 and Figure 2 The housing 11 may have a first water inlet 11g that communicates with the heat replenishment chamber 11a. The first water inlet 11g is used to communicate with a water source to replenish water to the heat replenishment chamber 11a.

[0052] Please see Figure 1 The first water inlet 11g can be connected to the water source through the first water pipe (not shown in the figure). A first automatic water supply valve (not shown in the figure) can be installed on the water pipe to automatically supply water to the heat supply chamber 11a through the first water inlet 11g according to the pressure in the heat pump system.

[0053] Please see Figure 1 and Figure 2 The housing 11 may also have a first drain outlet 11i that communicates with the heating chamber 11a, and the first drain outlet 11i is used to drain the water flow in the heating chamber 11a.

[0054] In one embodiment, please refer to Figure 1 and Figure 2 The housing 11 may have a second water inlet 11h that communicates with the buffer chamber 11b.

[0055] The second water inlet 11h is used to connect to a water source to replenish water to the buffer chamber 11b.

[0056] Please see Figure 1 The second water inlet 11h can be connected to the water source through the second water pipe 70. A second automatic water supply valve 80 can be installed on the water pipe, which can automatically supply water to the buffer chamber 11b through the second water inlet 11h according to the pressure in the heat pump system.

[0057] In one embodiment, please refer to Figure 2 The buffer heating water tank 10 may include a first safety valve 13 disposed on the tank body 11. The first safety valve 13 is used to connect the heat replenishment chamber 11a with the external environment.

[0058] The first safety valve 13 is used to release the pressure in the heating chamber 11a. When the pressure in the heating chamber 11a exceeds the set safety value, the first safety valve 13 connects the heating chamber 11a to the external environment to release the excess pressure and prevent damage or safety accidents caused by overpressure.

[0059] Please see Figure 2 The first safety valve 13 is located at the top of the heating chamber 11a along the height direction, which not only ensures that the first safety valve 13 can respond to pressure changes in a timely manner, but also quickly releases the gas accumulated at the top of the heating chamber 11a when the pressure is too high.

[0060] In one embodiment, please refer to Figure 2 The buffer heating water tank 10 may include a second safety valve 14 disposed on the tank body 11, the second safety valve 14 being used to connect the buffer chamber 11b to the external environment.

[0061] The second safety valve 14 is used to release the pressure in the buffer chamber 11b.

[0062] Similar to the location of the first safety valve 13, the second safety valve 14 can be located at the top of the buffer chamber 11b along the height direction.

[0063] In one embodiment, please refer to Figure 1 and Figure 2 The buffer heating water tank 10 may include a temperature detection device 15, which is used to detect the temperature of the heating chamber 11a or the buffer chamber 11b. The temperature detection device 15 extends into one of the heating chamber 11a and the buffer chamber 11b.

[0064] For example, the temperature detection device 15 may extend only into the heating chamber 11a without extending into the buffer chamber 11b, and only detect the temperature of the heating chamber 11a; or it may extend only into the buffer chamber 11b without extending into the heating chamber 11a, and only detect the temperature of the buffer chamber 11b; or two temperature detection devices 15 may be provided, extending into the heating chamber 11a and the buffer chamber 11b respectively.

[0065] In one embodiment, the heat pump system includes a control component that may be located in the heat pump host 20 and signal-connected to the first heating element 121 to control the opening and closing of the first heating element 121 according to the temperature of the supplementary heating chamber 11a.

[0066] When the temperature of the water in the heating chamber 11a does not reach the set temperature, the control component controls the first heating element 121 to turn on, so as to heat the water in the heating chamber 11a to the set temperature, so as to ensure that the temperature of the water flowing into the end 30 can meet the heating requirements.

[0067] Preferably, a temperature detection device 15 can be installed in the heating cavity 11a to detect the temperature of the heating cavity 11a. The temperature detection device 15 is connected to the control component to further adjust the first heating element 121 according to the temperature of the heating cavity 11a.

[0068] For example, the control component may also be signal-connected to the second heating element 122 to control the opening and closing of the second heating element 122 according to the temperature of the buffer chamber 11b.

[0069] The heat pump system of this application will be further described in detail below with a specific embodiment.

[0070] Please see Figure 3 After the heat pump system starts up, the circulation pump 41 is first turned on to make the water flow along the circulation pipe 40. If the inlet water temperature TW1 of the heat pump host 20 is less than the first preset temperature TW 0-1 Then, the second heating element 122 is energized to heat the water in the buffer chamber 11b. When the inlet water temperature TW1 is less than the second preset temperature TW 0-2 If the first heating element is de-energized, the heat pump unit 20 will be started. If the inlet water temperature TW1 of the heat pump unit 20 is not less than the first preset temperature TW... 0-1 Then the heat pump unit 20 can be started directly.

[0071] The temperature detection device 15 can be installed at the main unit inlet 20a to detect the inlet water temperature TW1, or the temperature detection device 15 installed in the buffer chamber 11b can be used to detect the inlet water temperature TW1.

[0072] Understandably, the first preset temperature TW 0-1 Less than the second preset temperature TW 0-2 This method can maintain the water temperature at the first preset temperature TW 0-1 Second preset temperature TW 0-2 The pressure difference between the two points (including the endpoint values) allows the compressor to quickly establish a pressure differential, causing the compressor body to heat up and the oil sump to heat up, thereby improving the reliability of the compressor.

[0073] In another embodiment, for a buffer heating water tank 10 without a second heating element 122, the water in the supplementary heating chamber 11a can be heated by energizing the first heating element 121, and then the heat in the supplementary heating chamber 11a can be transferred to the buffer chamber 11b to heat the water in the buffer chamber 11b.

[0074] Please see Figure 4 For a heat pump system that is in a shutdown state, if the inlet water temperature TW1 of the heat pump host 20 is less than the first preset temperature TW 0-1 The second heating element 122 is energized to heat the buffer chamber 11b, and the circulation pump 41 is turned on to allow water to flow along the circulation pipe 40, thus achieving an antifreeze effect. If the inlet water temperature TW1 of the heat pump main unit 20 is greater than or equal to the first preset temperature TW 0-1 If the probability of water freezing is low, the second heating element 122 can be de-energized, and the circulation pump 41 can be shut off.

[0075] Please see Figure 5 During the defrosting phase of the heat pump system, at each interval t 0-1 The temperature TB of the heating chamber 11a is collected once by the temperature detection device 15. The temperatures of the heating chamber 11a in n time periods are TB1, TB2...TB. n Calculate the rate of change ΔT of the temperature TB of the heating chamber 11a in adjacent time periods. 1n =TB n-1 -TB n If the rate of change ΔT 1n Not less than the first preset value △T 0-1 This indicates that the water temperature fluctuation is large. Therefore, N0 = 1, N = N0, and the first heating element 121 is activated to heat the water in the heat replenishment chamber 11a, thereby increasing the temperature of the water flowing into the circulation pipe 40, reducing temperature fluctuations at the end 30, and improving the user experience. If the total duration is N*t... 0-1 If the time is less than the first preset duration t1, take N = N0 + 1, and continue at intervals t. 0-1 The temperature TB of the heating chamber 11a is collected once for subsequent judgment. If the total duration is N*t... 0-1 If the time is not less than the first preset duration t1, the rate of change ΔT is judged again. 1n and the first preset value △T 0-1 The magnitude of the change, if the rate of change ΔT 1n Not less than the first preset value △T 0-1 The second heating element 122 is activated to heat the water in the buffer chamber 11b, thereby further increasing the water flow into the circulation pipe 40 and further reducing the temperature fluctuation at the end 30. This continues at intervals of t.0-1 The temperature TB of the heating chamber 11a is collected for further analysis. If the rate of change ΔT 1n Less than the first preset value △T 0-1 This indicates that the temperature fluctuation at the end 30 is small, so the first heating element 121 and the second heating element 122 are de-energized, and the process continues every time t. 0-1 The temperature TB value of the heating chamber 11a was collected once for subsequent judgment.

[0076] Please see Figure 6 During the heating phase of the heat pump system, at each interval t 0-2 The temperature TB of the heating chamber 11a is collected once by the temperature detection device 15. The temperatures of the heating chamber 11a in n time periods are TB1, TB2...TB. n Calculate the rate of change ΔT of the temperature TB of the heating chamber 11a in adjacent time periods. 2n =TB n -TB n-1 If the rate of change ΔT 2n Less than the second preset value △T 0-2 This indicates that the water temperature fluctuation in the heating chamber 11a is large. Therefore, N0 = 1, N = N0, and the first heating element 121 is activated to heat the water in the heating chamber 11a, causing the temperature of the water flowing into the circulation pipe 40 to rise rapidly, thereby quickly increasing the water temperature at the terminal 30 to meet user needs. If the total duration is N*t... 0-2 If the time is less than the second preset duration t2, take N = N0 + 1, and continue at intervals t. 0-2 The temperature TB of the heating chamber 11a is collected for subsequent judgment. If the total duration is N*t... 0-2 If the time is not less than the second preset duration t2, the rate of change ΔT is judged again. 2n Second preset value △T 0-2 The magnitude of the change, if the rate of change ΔT 2n Less than the second preset value △T 0-2 The second heating element 122 is activated to heat the water in the buffer chamber 11b, further increasing the temperature of the water flowing into the circulation pipe 40. This continues at intervals of t. 0-1 The temperature TB of the heating chamber 11a is collected for further analysis. If the rate of change ΔT 2n Less than the second preset value △T 0-2 Then, the first heating element 121 and the second heating element 122 are de-energized, and the cycle continues every time interval t. 0-1 The temperature (TB) of the water tank in the heating zone is collected for subsequent judgment.

[0077] In the description of this application, the references to terms such as "in one embodiment," "in some embodiments," "in other embodiments," "in yet another embodiment," or "exemplary," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine the different embodiments or examples described in this application, as well as the features of the different embodiments or examples.

[0078] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A buffer hot water tank characterized by, The application relates to a buffer heating water tank and a heat pump system. The application relates to a buffer heating water tank and a heat pump system. The application relates to a buffer heating water tank and a heat pump system.

2. The buffer hot water tank according to claim 1, wherein The application relates to a buffer heating water tank and a heat pump system.

3. The buffer heating water tank according to claim 1 or 2, characterized in that, The application relates to a buffer heating water tank and a heat pump system.

4. The buffer hot water tank according to claim 3, wherein The application relates to a buffer heating water tank and a heat pump system.

5. The buffer hot water tank according to claim 1 or 2, wherein The application relates to a buffer heating water tank and a heat pump system. The application relates to a buffer heating water tank and a heat pump system.

6. The buffer hot water tank according to claim 1 or 2, wherein The application relates to a buffer heating water tank and a heat pump system. The application relates to a buffer heating water tank and a heat pump system.

7. The buffer hot water tank according to claim 1 or 2, wherein The application relates to a buffer heating water tank and a heat pump system.

8. A heat pump system, characterized by, The application relates to a buffer heating water tank and a heat pump system. The application relates to a buffer heating water tank and a heat pump system. The application relates to a buffer heating water tank and a heat pump system. The application relates to a buffer heating water tank and a heat pump system. The application relates to a buffer heating water tank and a heat pump system.

9. The heat pump system of claim 8, wherein, The application relates to a buffer heating water tank and a heat pump system.

10. Heat pump system according to claim 8 or 9, characterized in that, The application relates to a buffer heating water tank and a heat pump system.

11. The heat pump system according to claim 8 or 9, characterized in that, The application relates to a buffer heating water tank and a heat pump system. The application relates to a buffer heating water tank and a heat pump system. The application relates to a buffer heating water tank and a heat pump system. The application relates to a buffer heating water tank and a heat pump system. The application relates to a buffer heating water tank and a heat pump system. The application relates to a buffer heating water tank and a heat pump system. The application relates to a buffer heating water tank and a heat pump system. The application relates to a buffer heating water tank and a heat pump system. The application relates to a buffer heating water tank and a heat pump system. The application relates to a buffer heating water tank and a heat pump system. The application relates to a buffer heating water tank and a heat pump system. 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