Heat pump system capable of cooling water and heating water

Abstract

The utility model relates to a heat pump system capable of refrigerating water and heating water, which comprises a hot water heat exchanger with a hot water outlet end, an evaporative condenser with an evaporator mode and a condenser mode, an inverter compressor and a cold and warm heat exchanger with a cold water outlet end, a first refrigerant circulating flow channel which is used for independently heating and allowing a refrigerant to circularly flow is arranged among the inverter compressor, the hot water heat exchanger and the evaporative condenser; a second refrigerant circulating flow channel used for independently refrigerating water and allowing a refrigerant to circularly flow is arranged among the variable frequency compressor, the evaporative condenser and the cold and warm heat exchanger; and a third refrigerant circulating flow channel which is used for simultaneously heating and refrigerating water and allowing a refrigerant to circularly flow is arranged among the variable frequency compressor, the hot water heat exchanger and the cold and warm heat exchanger.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pump systems, in particular to a heat pump system capable of cooling water and heating water. Background Art

[0002] In the hotel industry, 24-hour hot water supply is a must. For some large hotels, the hot water supply is large, and the production of hot water is a relatively high cost. If the hot water supply is insufficient, it is relatively troublesome for the hotel to replace the pipe hot water system. In addition, in summer, the hotel industry or some mechanical equipment manufacturers need to use refrigeration water equipment to cool down.

[0003] Chinese Patent No. ZL202310736695.9 discloses a heat source tower heat pump system, the heat source tower heat pump system includes a heat source tower, a heat pump system, a regeneration component, a first pipeline and a second pipeline, the heat source tower has a heat source liquid storage area, a regeneration component, including a regeneration heat exchanger, a regeneration tower and a circulating air duct component connected to the regeneration tower in a closed loop, the regeneration tower has a regeneration liquid storage area inside, the heat source liquid storage area is connected to the solution evaporator, the heat exhaust condenser and the regeneration liquid storage area in a switchable manner, the liquid outlets of the solution evaporator and the heat exhaust condenser are connected to the heat source tower, the circulating air duct and the hot water condenser are arranged on the first pipeline, hot water flows out of the outlet of the first pipeline, the cold water evaporator is arranged on the second pipeline, and chilled water flows out of the outlet of the second pipeline.

[0004] The heat pump system comprises a compressor, a hot water condenser, a heat exhaust condenser, a cold water evaporator and a solution evaporator which are connected in sequence end to end. It uses multiple condensers and evaporators, and the product cost structure is high.

[0005] Therefore, further improvement is needed. Utility Model Content

[0006] The purpose of the utility model is to provide a heat pump system that can cool water and hot water, by adding a cold and warm heat exchanger to the heat pump system to replace the existing air-conditioning system, such as Chinese patent No. ZL201210289284.1 discloses a variable frequency air-cooled cold water heat pump air-conditioning and hot water system, which has a lower installation cost.

[0007] The purpose of the utility model is achieved in this way:

[0008] A heat pump system capable of cooling water and heating water, comprising a hot water heat exchanger with a hot water outlet, an evaporative condenser with an evaporator mode and a condenser mode, a variable frequency compressor, and a cold-warm heat exchanger with a cold water outlet;

[0009] A first refrigerant circulation channel for independent heating and circulation of refrigerant is provided between the variable frequency compressor, the hot water heat exchanger and the evaporative condenser;

[0010] A second refrigerant circulation channel for cooling water and circulating refrigerant is provided between the variable frequency compressor, the evaporative condenser and the cold and warm heat exchanger;

[0011] A third refrigerant circulation channel for simultaneously heating and cooling water and supplying refrigerant for circulation is provided between the variable frequency compressor, the hot water heat exchanger and the cold and warm heat exchanger.

[0012] At the same time, heating and cooling water can be selected by choosing heating priority, cooling water priority, or heating and cooling water reaching preset temperature mode respectively. When heating priority mode is selected, when the hot water outlet temperature of the hot water heat exchanger reaches the system set temperature, the variable frequency compressor stops working; when cooling water priority mode is selected, if the temperature of the cold water outlet reaches the system set temperature, the variable frequency compressor stops working; when heating and cooling water reaching preset temperature mode respectively, when the heating and cooling water reach the system set temperature respectively, the variable frequency compressor stops working.

[0013] When cooling water alone, the hot air blown out by the evaporative condenser can be used for heat recovery.

[0014] The produced cold water can be used for cooling mechanical equipment as a cold source. When the site needs more cold sources, there is no need to replace the entire system. The site only needs to add the system on the original basis to reduce the load of providing cold sources.

[0015] The cold and warm heat exchanger is provided with a coil, which includes an inner tube for liquid to enter and an outer tube for connecting the second refrigerant circulation channel and the third refrigerant circulation channel, and the outer tube is sleeved on the inner tube; the refrigerant enters the outer tube through the second refrigerant circulation channel and the third refrigerant circulation channel and exchanges heat with the liquid circulating on the inner tube, so that cold water flows out from the water outlet of the cold and warm heat exchanger. The cold and warm heat exchanger can also be provided with a fan, which is used to increase the heat exchange effect between the refrigerant and the liquid in the cold and warm heat exchanger. The evaporative condenser is provided with a fan for driving air flow, so that the indoor air can exchange heat with the outdoor air.

[0016] A four-way solenoid valve A is provided on the connecting pipe between the variable frequency compressor and the hot water heat exchanger, and a first liquid reservoir, a first non-return valve and a flow channel distributor are provided on the connecting pipe between the hot water heat exchanger and the evaporative condenser; a four-way solenoid valve B and a gas-liquid separator are provided on the connecting pipe between the evaporative condenser and the variable frequency compressor; when the heat pump system is heating alone, the variable frequency compressor drives the refrigerant to pass through the four-way solenoid valve A, the hot water heat exchanger, the first liquid reservoir, the first non-return valve and the flow channel distributor in sequence into the evaporative condenser, and the refrigerant passing through the evaporative condenser returns to the variable frequency compressor along the connecting pipe between the four-way solenoid valve B and the gas-liquid separator to form a first refrigerant circulation flow channel.

[0017] A first solenoid valve is provided on the first refrigerant circulation channel, and a pipeline between the hot water heat exchanger and the first liquid reservoir is connected to one end of the first solenoid valve; a pipeline between the first one-way valve and the channel distributor is connected to the other end of the first solenoid valve.

[0018] A first filter, a first valve body and / or a second valve body are connected on the pipeline between the flow channel distributor and the evaporative condenser; when the heat pump system is heating alone, the refrigerant passing through the first one-way valve enters the evaporative condenser along the flow channel distributor, the first valve body and / or the second valve body, the first valve body is a solenoid valve, and the second valve body is an expansion valve.

[0019] By setting the flow channel distributor, the setting of the four-way solenoid valve can be reduced, the pipeline setting can be more orderly, and the refrigerant can move according to the set pipeline.

[0020] The flow channel distributor is connected to the cold and warm heat exchanger, and a second filter, a third valve body and / or a fourth valve body are provided on the connecting pipe between the flow channel distributor and the cold and warm heat exchanger; a second one-way valve for supplying refrigerant to the flow channel distributor is also provided between the flow channel distributor and the evaporative condenser; when the heat pump cools water alone, the variable frequency compressor drives the refrigerant to enter the evaporative condenser in sequence through the four-way solenoid valve A and the four-way solenoid valve B. The refrigerant passing through the evaporative condenser enters the flow channel distributor along the second one-way valve and enters the cold and warm heat exchanger through the second filter, the third valve body and / or the fourth valve body when the first valve body and / or the second valve body are closed. The refrigerant passing through the cold and warm heat exchanger returns to the variable frequency compressor along the connecting pipe between the four-way solenoid valve B and the gas-liquid separator to form a second refrigerant circulation flow channel.

[0021] A connecting pipeline connected to the third one-way valve and the second liquid storage tank is also provided between the flow channel distributor and the cold and warm heat exchanger.

[0022] When the heat pump system heats and cools water at the same time, the variable frequency compressor drives the refrigerant to pass through the four-way solenoid valve A, the hot water heat exchanger, the first liquid reservoir, the first one-way valve, and enter the flow channel distributor in sequence, and when the first valve body and / or the second valve body are closed, pass through the second filter, the third valve body and / or the fourth valve body to enter the cold and warm heat exchanger. The refrigerant passing through the cold and warm heat exchanger returns to the variable frequency compressor along the connecting pipe between the four-way solenoid valve B and the gas-liquid separator to form a third refrigerant circulation flow channel.

[0023] The hot water outlet end of the hot water heat exchanger is connected to the hot water storage tank through a pipeline.

[0024] The cold water outlet end of the cold-warm heat exchanger is connected to the cold water storage tank through a pipeline.

[0025] The beneficial effects of the utility model are as follows:

[0026] By adding a cooling and heating heat exchanger to the heat pump system to replace the existing air conditioning system, the setup cost is lower.

[0027] When cooling water alone, the hot air blown out by the evaporative condenser can be used for heat recovery. It can also cool water and hot water at the same time. The cooling water and hot water have three modes, which can stop the compressor from working in time, achieving energy-saving effect.

[0028] The produced cold water can be used for cooling mechanical equipment as a cold source. When the site needs more cold sources, there is no need to replace the entire system. The site only needs to add the system on the original basis to reduce the load of providing cold sources. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the refrigerant flow structure when the heat pump system of one embodiment of the utility model produces hot water alone.

[0030] Figure 2 This is a schematic diagram of the flow structure of a heat pump system with separate cooling water and refrigerant in one embodiment of the utility model.

[0031] Figure 3 This is a schematic diagram of the refrigerant flow structure when cooling water and heating water in one embodiment of the utility model. DETAILED DESCRIPTION

[0032] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0033] See also Figure 1-Figure 3 , a heat pump system capable of cooling water and heating water, comprising a hot water heat exchanger 1 provided with a hot water outlet, an evaporative condenser 2 having an evaporator mode and a condenser mode, a variable frequency compressor 3, and also comprising a cold and warm heat exchanger 4 provided with a cold water outlet;

[0034] A first refrigerant circulation channel for independent heating and circulation of refrigerant is provided between the variable frequency compressor 3, the hot water heat exchanger 1 and the evaporative condenser 2;

[0035] A second refrigerant circulation channel for cooling water and circulating refrigerant is provided between the variable frequency compressor 3, the evaporative condenser 2, and the cold and warm heat exchanger 4;

[0036] A third refrigerant circulation channel for simultaneously heating and cooling water and circulating the refrigerant is provided between the variable frequency compressor 3, the hot water heat exchanger 1, and the cold and warm heat exchanger 4.

[0037] A coil 6 is provided on the cold and warm heat exchanger 4, and the coil 6 includes an inner tube for liquid to enter, and an outer tube for connecting the second refrigerant circulation channel and the third refrigerant circulation channel, and the outer tube is sleeved on the inner tube; the refrigerant enters the outer tube through the second refrigerant circulation channel and the third refrigerant circulation channel and exchanges heat with the liquid circulating on the inner tube, so as to realize the outflow of cold water at the water outlet end of the cold and warm heat exchanger 4, and a fan 5 for driving air flow is provided on the evaporative condenser 2.

[0038] A four-way solenoid valve A is provided on the connecting pipe between the variable frequency compressor 3 and the hot water heat exchanger 1, and a first liquid reservoir 7, a first non-return valve 8 and a flow channel distributor 9 are provided on the connecting pipe between the hot water heat exchanger 1 and the evaporative condenser 2; a four-way solenoid valve B and a gas-liquid separator 10 are provided on the connecting pipe between the evaporative condenser 2 and the variable frequency compressor 3; when the heat pump system is heating alone, the variable frequency compressor 3 drives the refrigerant to pass through the four-way solenoid valve A, the hot water heat exchanger 1, the first liquid reservoir 7, the first non-return valve 8 and the flow channel distributor 9 in sequence to enter the evaporative condenser 2, and the refrigerant passing through the evaporative condenser 2 returns to the variable frequency compressor 3 along the connecting pipe between the four-way solenoid valve B and the gas-liquid separator 10 to form a first refrigerant circulation flow channel.

[0039] A first solenoid valve 11 is provided on the first refrigerant circulation channel, and the pipeline between the hot water heat exchanger 1 and the first liquid reservoir 7 is connected to one end of the first solenoid valve 11; the pipeline between the first one-way valve 8 and the channel distributor 9 is connected to the other end of the first solenoid valve 11.

[0040] The first filter 12, the first valve body 13 and / or the second valve body 14 are connected on the pipeline between the flow channel distributor 9 and the evaporative condenser 2; when the heat pump system is heating alone, the refrigerant passing through the first one-way valve 8 enters the evaporative condenser 2 along the flow channel distributor 9, the first valve body 13 and / or the second valve body 14, the first valve body 13 is a solenoid valve, and the second valve body 14 is an expansion valve.

[0041] The flow channel distributor 9 is connected to the cold and warm heat exchanger 4, and a second filter 15, a third valve body 16 and / or a fourth valve body 17 are provided on the connecting pipe between the flow channel distributor 9 and the cold and warm heat exchanger 4; a second one-way valve 18 is also provided between the flow channel distributor 9 and the evaporative condenser 2 for supplying refrigerant to the flow channel distributor 9; when the heat pump cools water alone, the variable frequency compressor 3 drives the refrigerant to enter the evaporative condenser 2 in sequence through the four-way solenoid valve A and the four-way solenoid valve B, and the refrigerant passing through the evaporative condenser 2 enters the flow channel distributor 9 along the second one-way valve 18 and enters the cold and warm heat exchanger 4 through the second filter 15, the third valve body 16 and / or the fourth valve body 17 when the first valve body 13 and / or the second valve body 14 are closed, and the refrigerant passing through the cold and warm heat exchanger 4 returns to the variable frequency compressor 3 along the connecting pipe between the four-way solenoid valve B and the gas-liquid separator 10 to form a second refrigerant circulation flow channel.

[0042] A connecting pipe connected to the third one-way valve and the second liquid reservoir 19 is also provided between the flow channel distributor 9 and the cold and warm heat exchanger 4 .

[0043] When the heat pump system heats and cools water at the same time, the variable frequency compressor 3 drives the refrigerant to pass through the four-way solenoid valve A, the hot water heat exchanger 1, the first liquid reservoir 7, the first one-way valve 8, and enter the flow channel distributor 9 in sequence, and when the first valve body 13 and / or the second valve body 14 are closed, pass through the second filter 15, the third valve body 16 and / or the fourth valve body 17 to enter the cold and warm heat exchanger 4. The refrigerant passing through the cold and warm heat exchanger 4 returns to the variable frequency compressor 3 along the connecting pipe between the four-way solenoid valve B and the gas-liquid separator 10 to form a third refrigerant circulation channel.

[0044] The hot water outlet of the hot water heat exchanger 1 is connected to the hot water storage tank through a pipeline.

[0045] The cold water outlet of the cold-warm heat exchanger 4 is connected to the cold water storage tank through a pipeline.

[0046] In this embodiment, temperature sensors are provided to detect the outlet water temperatures of the hot water outlet and the cold water outlet.

[0047] Specifically:

[0048] The utility model has three working conditions:

[0049] First working condition:

[0050] When the heat pump system produces hot water alone, when the system refrigerant enters the evaporative condenser 2 from the four-way solenoid valve A, the hot water heat exchanger 1, the first liquid reservoir 7, the first non-return valve 8, and the flow channel distributor 9 in sequence, and the refrigerant passing through the evaporative condenser 2 returns to the variable frequency compressor 3 along the connecting pipe between the four-way solenoid valve B and the gas-liquid separator 10 to form a circulation loop, it is the independent hot water production mode.

[0051] Second working condition:

[0052] When the heat pump system cools water alone, the variable frequency compressor 3 drives the refrigerant to enter the evaporative condenser 2 through the four-way solenoid valve A and the four-way solenoid valve B in sequence. The refrigerant passing through the evaporative condenser 2 enters the flow channel distributor 9 along the second one-way valve 18 and enters the cold and warm heat exchanger 4 through the second filter 15, the third valve body 16 and / or the fourth valve body 17 when the first valve body 13 and / or the second valve body 14 are closed. The refrigerant passing through the cold and warm heat exchanger 4 returns to the variable frequency compressor 3 along the connecting pipe between the four-way solenoid valve B and the gas-liquid separator 10 to form a circulation loop, which is the single cooling water mode.

[0053] The third working condition:

[0054] When the heat pump system produces hot water and cold water at the same time, the variable frequency compressor 3 drives the refrigerant to pass through the four-way solenoid valve A, the hot water heat exchanger 1, the first liquid reservoir 7, the first non-return valve 8, enter the flow channel distributor 9 in sequence, and pass through the second filter 15, the third valve body 16 and / or the fourth valve body 17 to enter the cold and warm heat exchanger 4 when the first valve body 13 and / or the second valve body 14 are closed. The refrigerant passing through the cold and warm heat exchanger 4 returns to the variable frequency compressor 3 along the connecting pipe between the four-way solenoid valve B and the gas-liquid separator 10 to form a circulation loop, which is a simultaneous hot water and cold water production mode.

[0055] The utility model also has five usage scenarios:

[0056] The first usage scenario:

[0057] The heat pump system produces hot water alone through the first working condition. When the hot water temperature reaches the system preset temperature, the compressor 3 stops, and the evaporative condenser 2 discharges cold air, which can be recycled through the pipeline.

[0058] The second usage scenario:

[0059] The heat pump system cools water alone through the second working condition. When the cold water temperature reaches the preset temperature of the system, the compressor 3 stops, and the evaporative condenser discharges hot air, which can be recycled through the pipeline.

[0060] The third usage scenario:

[0061] The heat pump system produces hot water and cold water at the same time through the third working condition, and selects the heating priority mode. When the hot water outlet temperature of the hot water heat exchanger reaches the system set temperature, the variable frequency compressor 3 stops working. If the cold water does not reach the system set temperature, it can also be recycled.

[0062] The fourth usage scenario:

[0063] The heat pump system produces hot water and cold water at the same time through the third working condition, and selects the cooling priority mode. If the temperature of the cold water outlet reaches the system set temperature, the variable frequency compressor 3 stops working. If the hot water does not reach the system set temperature, it can also be recycled.

[0064] The fifth usage scenario:

[0065] The heat pump system produces hot water and cold water at the same time through the third working condition, and selects the heating and cooling water to reach the preset temperature mode respectively. When the heating and cooling water reach the system set temperature respectively, the variable frequency compressor 3 stops working.

[0066] When the heating power load is insufficient, the first operating condition will be activated, and when the cooling power load is insufficient, the second operating condition will be activated.

[0067] The above is a preferred embodiment of the utility model, which shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. The utility model may have various changes and improvements without departing from the spirit and scope of the utility model, and these changes and improvements fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A heat pump system capable of cooling water and heating water, comprising a hot water heat exchanger (1) provided with a hot water outlet, an evaporative condenser (2) having an evaporator mode and a condenser mode, and a variable frequency compressor (3), characterized in that: It also includes a cold-warm heat exchanger (4) provided with a cold water outlet; A first refrigerant circulation flow channel for independent heating and for circulating refrigerant is provided between the variable frequency compressor (3), the hot water heat exchanger (1), and the evaporative condenser (2); A second refrigerant circulation flow channel for independently cooling water and circulating refrigerant is provided between the variable frequency compressor (3), the evaporative condenser (2), and the cold and warm heat exchanger (4); A third refrigerant circulation flow channel for simultaneously heating and cooling water and for circulating refrigerant is provided between the variable frequency compressor (3), the hot water heat exchanger (1), and the cold and warm heat exchanger (4).

2. The heat pump system capable of cooling water and heating water according to claim 1, characterized in that: A coil (6) is provided on the cold and warm heat exchanger (4), and the coil (6) includes an inner tube for liquid to enter, and an outer tube for connecting a second refrigerant circulation channel and a third refrigerant circulation channel, and the outer tube is sleeved on the inner tube; the refrigerant enters the outer tube through the second refrigerant circulation channel and the third refrigerant circulation channel and exchanges heat with the liquid circulating on the inner tube, so that cold water flows out from the water outlet end of the cold and warm heat exchanger (4), and a fan (5) for driving air flow is provided on the evaporative condenser (2).

3. The heat pump system capable of cooling water and heating water according to claim 1, characterized in that: A four-way solenoid valve A is provided on the connecting pipe between the variable frequency compressor (3) and the hot water heat exchanger (1); a first liquid reservoir (7), a first non-return valve (8), and a flow channel distributor (9) are provided on the connecting pipe between the hot water heat exchanger (1) and the evaporative condenser (2); a four-way solenoid valve B and a gas-liquid separator (10) are provided on the connecting pipe between the evaporative condenser (2) and the variable frequency compressor (3); when the heat pump system is heating alone, the variable frequency compressor (3) drives the refrigerant to pass through the four-way solenoid valve A, the hot water heat exchanger (1), the first liquid reservoir (7), the first non-return valve (8), and the flow channel distributor (9) in sequence to enter the evaporative condenser (2); the refrigerant that has passed through the evaporative condenser (2) returns to the variable frequency compressor (3) along the connecting pipe between the four-way solenoid valve B and the gas-liquid separator (10), so as to form a first refrigerant circulation flow channel.

4. The heat pump system capable of cooling water and heating water according to claim 3, characterized in that: A first solenoid valve (11) is provided on the first refrigerant circulation channel; a pipeline between the hot water heat exchanger (1) and the first liquid storage container (7) is connected to one end of the first solenoid valve (11); and a pipeline between the first one-way valve (8) and the flow channel distributor (9) is connected to the other end of the first solenoid valve (11).

5. The heat pump system capable of cooling water and heating water according to claim 3, characterized in that: A first filter (12), a first valve body (13) and / or a second valve body (14) are connected to a pipeline between the flow channel distributor (9) and the evaporative condenser (2); when the heat pump system is heating alone, the refrigerant passes through the first one-way valve (8) and enters the evaporative condenser (2) along the flow channel distributor (9), the first valve body (13) and / or the second valve body (14); the first valve body (13) is a solenoid valve, and the second valve body (14) is an expansion valve.

6. The heat pump system capable of cooling water and heating water according to claim 5, characterized in that: The flow channel distributor (9) is connected to the cold and warm heat exchanger (4), and a second filter (15), a third valve body (16) and / or a fourth valve body (17) are provided on the connecting pipe between the flow channel distributor (9) and the cold and warm heat exchanger (4); a second one-way valve (18) for supplying refrigerant to flow to the flow channel distributor (9) is also provided between the flow channel distributor (9) and the evaporative condenser (2); when the heat pump cools water alone, the variable frequency compressor (3) drives the refrigerant to sequentially enter the evaporative condenser through the four-way solenoid valve A and the four-way solenoid valve B. The refrigerant passes through the evaporative condenser (2) along the second one-way valve (18) into the flow channel distributor (9) and enters the cold-heat exchanger (4) through the second filter (15), the third valve body (16) and / or the fourth valve body (17) when the first valve body (13) and / or the second valve body (14) are closed. The refrigerant passes through the cold-heat exchanger (4) along the connecting pipe between the four-way solenoid valve B and the gas-liquid separator (10) and returns to the variable frequency compressor (3) to form a second refrigerant circulation flow channel.

7. The heat pump system capable of cooling water and heating water according to claim 6, characterized in that: A connecting pipe connected to a third one-way valve and a second liquid storage device (19) is also provided between the flow channel distributor (9) and the cold and warm heat exchanger (4).

8. The heat pump system capable of cooling water and heating water according to claim 6, characterized in that: When the heat pump system heats and cools water at the same time, the variable frequency compressor (3) drives the refrigerant to pass through the four-way solenoid valve A, the hot water heat exchanger (1), the first liquid reservoir (7), the first non-return valve (8), and the flow channel distributor (9) in sequence, and when the first valve body (13) and / or the second valve body (14) are closed, the refrigerant passes through the second filter (15), the third valve body (16) and / or the fourth valve body (17) and enters the cold and warm heat exchanger (4). The refrigerant that has passed through the cold and warm heat exchanger (4) returns to the variable frequency compressor (3) along the connecting pipe between the four-way solenoid valve B and the gas-liquid separator (10) to form a third refrigerant circulation flow channel.

9. The heat pump system capable of cooling water and heating water according to claim 1, characterized in that: The hot water outlet end of the hot water heat exchanger (1) is connected to the hot water storage tank via a pipeline.

10. The heat pump system capable of cooling water and heating water according to claim 1, characterized in that: The cold water outlet of the cold-warm heat exchanger (4) is connected to the cold water storage tank via a pipeline.

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