Energy-saving radiation cooling and heating heat pump system and control method

Abstract

The present application discloses an energy-saving radiant cooling and heating heat pump system, comprising cold and heat source components and a circulating water system, wherein the circulating water system comprises a water tank, and the cold and heat source components comprise a refrigerant-water heat exchanger; the refrigerant-water heat exchanger performs heat exchange with the water tank, and the water tank is connected with ground buried pipes and wall buried pipes, the ground buried pipes and wall buried pipes are connected with switchable series or parallel pipes, and the series-parallel connection switching of the ground buried pipes and the wall buried pipes is achieved according to the switching temperature set by the system controller, and the heating or cooling capacity of the refrigerant-water heat exchanger is adjusted according to the outdoor ambient temperature, thereby improving the comfort of people in the air-conditioned room while achieving energy saving and environmental protection.

Description

Technical Field

[0001] The invention relates to a radiation cooling and heating heat pump system and a control method, and relates to the technical field of heat pump / refrigeration energy saving. Background Art

[0002] Due to the high energy efficiency of heat pump systems and the good thermal comfort of radiant heating, the application of heat pump hot water radiant heating systems is increasing. With the improvement of people's living standards, people are now more and more concerned about the thermal comfort of cooling in summer, so radiant cooling with good thermal comfort is also attracting more and more attention. A radiant cooling and heating heat pump system that realizes radiant cooling in summer and radiant heating in winter with one host has begun to have some application cases and is developing rapidly. The main technical problem faced in the development of this technology is to make the thermal comfort better and the system operation more efficient and energy-saving. At present, the radiant cooling and heating heat pump system mostly adopts a constant temperature water supply method, that is, the cooling water temperature and the hot water temperature are determined according to the designed maximum ambient temperature in summer and the designed minimum ambient temperature in winter. Since the outdoor ambient temperature varies greatly throughout the summer cooling season and the winter heating season, and the cold and hot loads vary greatly, the variable water supply temperature method can be adopted, that is, when the ambient temperature decreases in summer, the cooling water temperature is appropriately increased, and when the ambient temperature increases in winter, the hot water temperature is appropriately reduced. In this way, the system operation energy efficiency will be improved and the operation energy saving purpose will be achieved. However, there is also a problem. When the ambient temperature is high in winter, the water supply temperature can be appropriately lowered. If the underground pipe method is used, the ground temperature may be lower than the recommended temperature value for human thermal comfort, resulting in reduced comfort. Therefore, it is necessary to provide a technology that can achieve energy saving in the operation of the radiant cooling and heating heat pump system by adjusting the water supply temperature as much as possible, while better meeting the thermal comfort requirements of the human body. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an energy-saving radiant cooling and heating heat pump system, which realizes radiant cooling in summer and radiant heating in winter, and can adjust the cooling water temperature in summer and the heating water temperature in winter according to the outdoor ambient temperature. At the same time, when adjusting the hot water greenhouse in winter, ground buried pipes and wall buried pipes are switched in series and parallel to ensure the ground temperature, so as to achieve energy-saving effects and meet the thermal comfort requirements of human bodies in air-conditioned rooms.

[0004] In order to achieve the above object, the present invention is implemented as follows: an energy-saving radiant cooling and heating heat pump system includes cold and heat source components and a circulating water system, wherein the circulating water system includes a main circulating water pump 7, a water tank 8, a loop circulating water pump 9, a ground buried pipe water supply header 11, a ground buried pipe return header 12, a wall buried pipe water supply header 16, and a wall buried pipe return header 17; the cold and heat source components include a refrigerant-water heat exchanger;

[0005] The cooling water outlet of the refrigerant-water heat exchanger 6 is connected to the main circulating water pump 7 and the connection port 1 at the lower end of the water tank 8 in sequence. The connection port 2 at the upper end of the water tank 8 is connected to the cooling water inlet of the refrigerant-water heat exchanger 6. The connection port 3 at the lower end of the water tank 8 is connected to the water inlet of the loop circulating water pump 9. The water inlet of the ground buried pipe water supply header 11 is connected in parallel with the water inlet of the wall buried pipe water supply header 16, and then connected to the water outlet of the loop circulating water pump 9. The water inlet of the ground buried pipe water supply header 11 is connected in parallel with the water inlet of the wall buried pipe water supply header 16. A wall buried pipe supply is arranged on the pipeline. Water valve 10, the outlet of the ground buried pipe return water header 12 is connected in parallel with the outlet of the wall buried pipe return water header 17 and then connected to the connection port 4 at the upper end of the water tank 8, the outlet of the ground buried pipe return water header 12 and the outlet of the wall buried pipe return water header 17 are connected in parallel with the outlet of the ground buried pipe return water header 18, the outlet of the ground buried pipe return water header 12 and the inlet of the wall buried pipe supply water header 16 are connected by a pipeline, and the outlet of the ground buried pipe return water header 12 and the inlet of the wall buried pipe supply water header 16 are connected with a connecting valve 15;

[0006] The outlet of the ground buried water supply header 11 and the water inlet of the ground buried water return header 12 are connected in parallel by a plurality of ground buried pipes 13, and the outlet of the wall buried water supply header 16 and the water inlet of the wall buried water return header 17 are connected in parallel by a plurality of wall buried pipes 14.

[0007] Preferably, the energy-saving radiation cooling and heating heat pump system further includes a system controller 19, an outdoor environment temperature sensor 20, a water tank temperature sensor 21, and a room air temperature sensor 22. The outdoor environment temperature sensor 20 is arranged outside the air-conditioned room to detect the outdoor environment temperature T w The water tank temperature sensor 21 is placed in the water tank 8 and is used to detect the actual water supply temperature T in the water tank 8. gs The room air temperature sensor 22 is set in the air-conditioned room to detect the actual room temperature T ns The main circulating water pump 7 and the loop circulating water pump 9 are connected to the system controller 19 through lines, the outdoor environment temperature sensor 20, the water tank temperature sensor 21, and the room air temperature sensor 22 are connected to the system controller 19 through lines, the wall buried pipe water supply valve 10, the connecting valve 15, and the ground buried pipe return valve 18 are all solenoid valves, the wall buried pipe water supply valve 10, the connecting valve 15, and the ground buried pipe return valve 18 are connected to the system controller 19 through lines, and the main circulating water pump 7 and the loop circulating water pump 9 are connected to the system controller 19 through lines.

[0008] Preferably, the cold and heat source components also include a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a throttle valve 4, and a gas-liquid separator 5. The liquid outlet end of the compressor 1 is connected to the D port of the four-way valve 2, the S port of the four-way valve 2 is connected to the liquid inlet of the gas-liquid separator 5, the liquid outlet of the gas-liquid separator 5 is connected to the return liquid port of the compressor 1, the E port of the four-way valve 2 is connected to the liquid inlet of the outdoor heat exchanger 3, the liquid outlet of the outdoor heat exchanger 3 is connected to the refrigerant inlet of the refrigerant-water heat exchanger 6, and a throttle valve 4 is provided on the connecting pipeline between the liquid outlet of the outdoor heat exchanger 3 and the refrigerant inlet of the refrigerant-water heat exchanger 6, and the refrigerant outlet of the refrigerant-water heat exchanger 6 is connected to the C port of the four-way valve 2.

[0009] Preferably, the four-way valve 2 is a solenoid valve, and the four-way valve 2 is connected to the system controller 19 through a line.

[0010] Preferably, the interface 1 and the connection port 3 at the lower end of the water tank 8 are located on the opposite sides of the water tank; the connection port 2 and the connection port 4 at the upper end of the water tank 8 are located on the opposite sides of the water tank.

[0011] Preferably, the control method of the energy-saving radiant cooling and heating heat pump system and the control method of the circulating water system are as follows:

[0012] The system controller 19 controls the main circulating water pump 7 to always be in operation;

[0013] (1) During the cooling operation in summer, the system controller 19 controls the wall buried pipe water supply valve 10 and the ground buried pipe return valve 18 to open, and the connecting valve 15 to close, that is, the ground buried pipe 13 and the wall buried pipe 14 are in parallel mode; the circulating water of the water tank 8 is pumped into the refrigerant-water heat exchanger 6 by the main circulating water pump 7, and then flows to the water tank 8 after heat exchange and cooling with the refrigerant in the cold and heat source components. The circulating water in the water tank 8 is divided into two paths, one of which is diverted to the ground buried pipe 13 through the ground buried pipe water supply header 11, and then returns to the ground buried pipe return header 12, and then flows out through the ground buried pipe return valve 18; the other path flows to the wall buried pipe water supply header 16 through the wall buried pipe water supply header 10, and then diverts to the wall buried pipe 14 through the wall buried pipe water supply header 16, and then returns to the wall buried pipe return header 17 and flows out. After the two return water paths are combined, they return to the water tank 8;

[0014] (2) In winter heating operation, when the actual water supply temperature T gs Higher than the switching temperature T set by the system controller 19 qh When the ground buried pipe 13 and the wall buried pipe 14 supply water in parallel, the system controller 19 controls the wall buried pipe water supply valve 10 and the ground buried pipe return valve 18 to open, and the connecting valve 15 to close;

[0015] When the actual water supply temperature T gs Below the switching temperature T qh When water is supplied in series, the switching temperature Tqh The setting range is 30-40°C. When the ground buried pipe 13 and the wall buried pipe 14 supply water in series, the system controller 19 controls the wall buried pipe water supply valve 10 and the ground buried pipe return valve 18 to be closed, and the connecting valve 15 to be opened, so that the circulating water in the water tank 8 is pumped into the refrigerant-water heat exchanger 6 by the main circulating water pump 7, and then flows to the water tank 8 after heat exchange with the refrigerant in the cold and heat source equipment. The circulating water in the water tank 8 is diverted to the ground buried pipe 13 through the ground buried pipe water supply header 11, and then returns to the ground buried pipe return header 12, and then flows to the wall buried pipe water supply header 16 through the connecting valve 15, and is diverted to the wall buried pipe 14 through the wall buried pipe water supply header 16, and then returns to the wall buried pipe return header 17, and then returns to the water tank 8;

[0016] The control steps for achieving cooling or heating operation by controlling the four-way valve (2) in the cold and heat source components are as follows:

[0017] (1) In the summer cooling operation, the four-way valve 2 is controlled to be in cooling mode, that is, the D port of the four-way valve 2 is connected to the E port, and the C port is connected to the S port. The refrigerant flows to the D port of the four-way valve 2 through the compressor 1, and flows to the outdoor heat exchanger 3 through the E port for condensation. The condensed refrigerant is throttled and depressurized by the throttle valve 4 to the refrigerant-water heat exchanger 6. In the refrigerant-water heat exchanger 6, the refrigerant exchanges heat with the circulating water in the circulating water system, the refrigerant evaporates and absorbs heat, and the circulating water cools down. The refrigerant continues to flow to the C port of the four-way valve 2, and then flows to the gas-liquid separator 5 through the S port, and finally returns to the compressor 1;

[0018] (2) During the winter heating operation, the four-way valve 2 is controlled to switch to the heating mode, that is, the D port of the four-way valve 2 is connected to the E port, and the C port is connected to the S port. The refrigerant flows to the D port of the four-way valve 2 through the compressor 1, and flows to the refrigerant-water heat exchanger 6 through the C port for condensation. In the refrigerant-water heat exchanger 6, the refrigerant exchanges heat with the circulating water in the circulating water system. The refrigerant condenses and releases heat, and the circulating water heats up. The condensed refrigerant is throttled and depressurized by the throttle valve 4 to the outdoor heat exchanger 3 for evaporation. The evaporated refrigerant flows to the E port of the four-way valve 2, and then flows to the gas-liquid separator 5 through the S port, and finally returns to the compressor 1.

[0019] Preferably, during summer cooling operation, when the actual water supply temperature T gs ≤T′ gs -2℃, the system controller 19 controls the compressor 1 to stop running; when the actual water supply temperature T gs >T′ gs When the system controller 19 compressor 1 is turned on; when the actual water supply temperature T gs ≥T′ gs +2℃, the system controller 19 controls the compressor 1 to stop running; when the actual water supply temperature T gs <T′gs When the system controller 19 controls the compressor 1 to start; the theoretical water supply temperature T' gs The determination method is as follows:

[0020] (1) In summer cooling operation, the theoretical water supply temperature T′ gs =50-T w ;

[0021] (2) Theoretical water supply temperature T′ during winter heating operation gs =37.5-0.5T w .

[0022] Preferably, the controller 19 also detects the actual room temperature T ns and room set temperature T′ ns The comparison situation is used to control the start or stop of the loop circulating water pump 9: in the summer cooling operation, when the actual temperature of the air-conditioned room T ns ≤Room set temperature T' ns -2℃, the loop water pump 9 stops running. When the actual temperature of the air-conditioned room is T ns >Room set temperature T′ ns When the system is running in winter, the actual temperature of the air-conditioned room is T ns ≥Room set temperature T' ns +2℃, the loop water pump 9 stops running. When the actual temperature of the air-conditioned room is T ns <Room set temperature T′ ns When, the loop circulating water pump 9 starts to run.

[0023] Preferably, the switching temperature T qh is 37℃.

[0024] Preferably, during the operation of the radiant cooling and heating heat pump system, no matter whether the compressor 1 is started or stopped, the main circulating water pump 7 is always in operation.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] (1) In summer, when the ambient temperature is lower than the design ambient temperature, the cooling water temperature of the radiant cooling and heating heat pump system is increased; in winter, when the ambient temperature is higher than the design ambient temperature, the system lowers the hot water temperature, thereby improving the system's operating energy efficiency and achieving the goal of energy saving;

[0027] (2) To improve the thermal comfort of the room, ground buried pipes and wall buried pipes are installed at the same time. The circulating water system controls the opening and closing of the wall buried pipe water supply valve, connecting valve and ground buried pipe return valve to realize the parallel or series operation of the ground buried pipe and wall buried pipe water circuits. When cooling is performed in summer, the ground buried pipe and wall buried pipe water circuits are operated in parallel;

[0028] (3) In winter, when heating is in operation, the ground buried pipes and wall buried pipes are set to switch between parallel or series operation. When the water supply temperature is high, the ground buried pipes and wall buried pipes are operated in parallel, so that the temperature difference between the ground and the wall is small, and the thermal comfort is better; when the water supply temperature is low, the ground buried pipes and wall buried pipes are operated in series, that is, the circulating water first passes through the ground buried pipes and then passes through the wall buried pipes. Compared with the parallel operation, the average temperature of the ground buried pipes is increased, ensuring thermal comfort; BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the radiation cooling and heating heat pump system implemented by the present invention.

[0030] Figure markings: 1-compressor, 2-four-way valve, 3-outdoor heat exchanger, 4-throttle valve, 5-gas-liquid separator, 6-refrigerant-water heat exchanger, 7-main circulating water pump, 8-water tank, 9-loop circulating water pump, 10-wall buried pipe water supply valve, 11-ground buried pipe water supply header, 12-ground buried pipe return header, 13-ground buried pipe, 14-wall buried pipe, 15-connecting valve, 16-wall buried pipe water supply header, 17-wall buried pipe return header, 18-ground buried pipe return valve, 19-system controller, 20-outdoor ambient temperature sensor, 21-water tank temperature sensor, 22-room air temperature sensor. DETAILED DESCRIPTION

[0031] The following describes in detail embodiments of the present invention. Examples of the embodiments are shown in the attached Figure 1 The following is shown in the attached Figure 1 The described embodiments are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0032] like Figure 1As shown, an energy-saving radiant cooling and heating heat pump system of the present invention includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a throttle valve 4, a gas-liquid separator 5, a refrigerant-water heat exchanger 6, a main circulating water pump 7, a water tank 8, a loop circulating water pump 9, a wall buried pipe water supply valve 10, a ground buried pipe water supply header 11, a ground buried pipe return header 12, a ground buried pipe 13, a wall buried pipe 14, a connecting valve 15, a wall buried pipe water supply header 16, a wall buried pipe return header 17, a ground buried pipe return valve 18 and a system controller 19, an outdoor ambient temperature sensor 20, a water tank temperature sensor 21, and a room air temperature sensor 22.

[0033] The cold and heat source components include a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a throttle valve 4, a gas-liquid separator 5 and a refrigerant-water heat exchanger 6. The liquid outlet end of the compressor 1 is connected to the D port of the four-way valve 2, the S port of the four-way valve 2 is connected to the liquid inlet of the gas-liquid separator 5, the liquid outlet of the gas-liquid separator 5 is connected to the return liquid port of the compressor 1, the E port of the four-way valve 2 is connected to the liquid inlet of the outdoor heat exchanger 3, the liquid outlet of the outdoor heat exchanger 3 is connected to the refrigerant inlet of the refrigerant-water heat exchanger 6, and a throttle valve 4 is arranged on the connecting pipeline between the liquid outlet of the outdoor heat exchanger 3 and the refrigerant inlet of the refrigerant-water heat exchanger 6, and the refrigerant outlet of the refrigerant-water heat exchanger 6 is connected to the C port of the four-way valve 2.

[0034] In the cold and heat source components, cooling or heating operation is achieved by controlling the four-way valve 2. The operation process of the cold and heat source components is as follows:

[0035] (1) In the summer cooling operation, the four-way valve 2 is controlled to be in cooling mode, that is, the D port of the four-way valve 2 is connected to the E port, and the C port is connected to the S port. The refrigerant flows to the D port of the four-way valve 2 through the compressor 1, and flows to the outdoor heat exchanger 3 through the E port for condensation. The condensed refrigerant is throttled and depressurized by the throttle valve 4 to the refrigerant-water heat exchanger 6. In the refrigerant-water heat exchanger 6, the refrigerant exchanges heat with the circulating water in the circulating water system, the refrigerant evaporates and absorbs heat, and the circulating water cools down. The refrigerant continues to flow to the C port of the four-way valve 2, and then flows to the gas-liquid separator 5 through the S port, and finally returns to the compressor 1;

[0036] (2) During the winter heating operation, the four-way valve 2 is controlled to switch to the heating mode, that is, the D port of the four-way valve 2 is connected to the E port, and the C port is connected to the S port. The refrigerant flows to the D port of the four-way valve 2 through the compressor 1, and flows to the refrigerant-water heat exchanger 6 through the C port for condensation. In the refrigerant-water heat exchanger 6, the refrigerant exchanges heat with the circulating water in the circulating water system. The refrigerant condenses and releases heat, and the circulating water heats up. The condensed refrigerant is throttled and depressurized by the throttle valve 4 to the outdoor heat exchanger 3 for evaporation. The evaporated refrigerant flows to the E port of the four-way valve 2, and then flows to the gas-liquid separator 5 through the S port, and finally returns to the compressor 1.

[0037] The circulating water system includes a main circulating water pump 7, a water tank 8, a loop circulating water pump 9, a wall buried pipe water supply valve 10, a ground buried pipe water supply header 11, a ground buried pipe return header 12, a ground buried pipe 13, a wall buried pipe 14, a connecting valve 15, a wall buried pipe water supply header 16, a wall buried pipe return header 17 and a ground buried pipe return valve 18, which provide cooling and heating for the air-conditioned room.

[0038] The cooling water outlet of the refrigerant-water heat exchanger 6 is connected to the main circulating water pump 7 and the connection port 1 at the lower end of the water tank 8 in sequence, the connection port 2 at the upper end of the water tank 8 is connected to the cooling water inlet of the refrigerant-water heat exchanger 6, the connection port 3 at the lower end of the water tank 8 is connected to the water inlet of the loop circulating water pump 9, the water inlet of the ground buried pipe water supply header 11 is connected in parallel with the water inlet of the wall buried pipe water supply header 16, and then connected to the water outlet of the loop circulating water pump 9, the water inlet of the ground buried pipe water supply header 11 is connected in parallel with the water inlet of the wall buried pipe water supply header 16, and a wall buried pipe water supply valve 10 is arranged on the pipeline, the The outlet of the ground buried pipe return water collection pipe 12 is connected in parallel with the outlet of the wall buried pipe return water collection pipe 17 and then connected to the connection port four at the upper end of the water tank 8. The water tank temperature sensor 21 is placed in the water tank 8. A ground buried pipe return water valve 18 is arranged on the parallel pipeline of the outlet of the ground buried pipe return water collection pipe 12 and the outlet of the wall buried pipe return water collection pipe 17. The outlet of the ground buried pipe return water collection pipe 12 and the inlet of the wall buried pipe water supply collection pipe 16 are connected by a pipeline, and a connecting valve 15 is arranged on the pipeline connecting the outlet of the ground buried pipe return water collection pipe 12 and the inlet of the wall buried pipe water supply collection pipe 16.

[0039] The interface 1 and the connection port 3 at the lower end of the water tank 8 are located on the opposite sides of the water tank; the connection port 2 and the connection port 4 at the upper end of the water tank 8 are located on the opposite sides of the water tank.

[0040] The water outlet of the ground buried water supply header 11 and the water inlet of the ground buried water return header 12 are connected in parallel by one or more ground buried pipes 13, and the water outlet of the wall buried water supply header 16 and the water inlet of the wall buried water return header 17 are connected in parallel by one or more wall buried pipes 14.

[0041] The four-way valve 2, the wall-buried pipe water supply valve 10, the connecting valve 15, and the ground-buried pipe return valve 18 are all solenoid valves. The wall-buried pipe water supply valve 10, the connecting valve 15, and the ground-buried pipe return valve 18 are connected to the system controller 19 through lines. The main circulating water pump 7 and the loop circulating water pump 9 are connected to the system controller 19 through lines. The outdoor ambient temperature sensor 20, the water tank temperature sensor 21, and the room air temperature sensor 22 are connected to the system controller 19 through lines.

[0042] The operation process of the circulating water system is as follows:

[0043] (1) During cooling operation in summer, the system controller 19 controls the wall buried pipe water supply valve 10 and the ground buried pipe return valve 18 to open, and the connecting valve 15 to close, that is, the ground buried pipe 13 and the wall buried pipe 14 are connected in parallel; the circulating water is pumped into the refrigerant-water heat exchanger 6 by the main circulating water pump 7, and then flows to the water tank 8 after heat exchange and cooling with the refrigerant in the cold and heat source components. The circulating water in the water tank 8 is divided into two paths, one of which is diverted to the ground buried pipe 13 through the ground buried pipe water supply header 11, and then returns to the ground buried pipe return header 12, and then flows out through the ground buried pipe return valve 18; the other path flows to the wall buried pipe water supply header 16 through the wall buried pipe water supply header 10, and then diverts to the wall buried pipe 14 through the wall buried pipe water supply header 16, and then returns to the wall buried pipe return header 17 and flows out. The two return waters are combined to enter the circulating water return pipe, and finally return to the water tank 8.

[0044] (2) In winter heating operation, when the actual water supply temperature T gs Higher than the switching temperature T set by the system controller 19 qh When the ground buried pipe 13 and the wall buried pipe 14 supply water in parallel, the actual water supply temperature T gs Below the switching temperature T qh When the water is supplied in series, the ground temperature is raised to provide indoor comfort. The switching temperature T qh The setting range is 30-40° C., and 37° C. is particularly preferred. When the ground buried pipe 13 and the wall buried pipe 14 supply water in parallel, the circulating water flow is the same as the aforementioned circulating water flow during summer cooling. When the ground buried pipe 13 and the wall buried pipe 14 supply water in series, the circulating water process is as follows: the wall buried pipe water supply valve 10 and the ground buried pipe return valve 18 are closed, and the connecting valve 15 is opened. The circulating water is pumped into the refrigerant-water heat exchanger 6 by the main circulating water pump 7, and then flows to the water tank 8 after heat exchange with the refrigerant in the cold and heat source equipment and heating. All the circulating water in the water tank 8 is diverted to the ground buried pipe 13 through the ground buried pipe water supply header 11, and then returns to the ground buried pipe return header 12, and then flows to the wall buried pipe water supply header 16 through the connecting valve 15, and is diverted to the wall buried pipe 14 through the wall buried pipe water supply header 16, and then returns to the wall buried pipe return header 17 and enters the circulating water return pipe, and finally returns to the water tank 8.

[0045] The temperature sensed by the outdoor ambient temperature sensor 20 is the outdoor ambient temperature T w The temperature sensed by the water tank temperature sensor 21 is the actual water supply temperature T gs The temperature sensed by the room air temperature sensor 22 is the actual room temperature T ns The system controller 19 detects and receives the outdoor ambient temperature T w , and determine the required theoretical water supply temperature T′ gs , according to the actual water supply temperature T gs and theoretical water supply temperature T′gs The comparison situation is used to control the start and stop of compressor 1. When the system is running in summer cooling mode, when the actual water supply temperature T gs ≤T′ gs -2℃, compressor 1 stops running; when the actual water supply temperature T gs >T′ gs When the system is running in winter heating mode, the actual water supply temperature T gs ≥T′ gs +2℃, compressor 1 stops running; when the actual water supply temperature T gs <T′ gs When the compressor 1 is turned on, the theoretical water supply temperature T' gs The determination method is as follows:

[0046] (1) In the summer cooling operation, in this embodiment, for example, the outdoor ambient temperature is designed to be 35°C, the corresponding design water supply temperature is 15°C, and the theoretical water supply temperature T′ gs =50-T w ;

[0047] (2) In winter heating operation, in this embodiment, for example, the designed outdoor ambient temperature is -15°C, the corresponding designed water supply temperature is 45°C, and the theoretical water supply temperature T′ gs =37.5-0.5T w .

[0048] The controller 19 also detects the actual room temperature T ns and room set temperature T′ ns The comparison situation is used to control the start and stop of the loop circulating water pump 9. When the system is running in summer cooling mode, when the actual temperature of the air-conditioned room is T ns ≤Room set temperature T′ ns -2℃, the loop water pump 9 stops running. When the actual temperature of the air-conditioned room is T ns >Room set temperature T′ ns When the system is running in winter, the actual temperature of the air-conditioned room is T ns ≥Room set temperature T' ns +2℃, the loop water pump 9 stops running. When the actual temperature of the air-conditioned room is T ns <Room set temperature T′ ns When, the loop circulation water pump 9 starts to run.

[0049] During the operation of the radiant cooling and heating heat pump system, no matter whether the compressor 1 is turned on or off, the main circulating water pump 7 is always in operation.

[0050] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is limited by the claims and their equivalents.

Claims

1. A control method for an energy-saving radiant cooling and heating heat pump system, characterized in that: The energy-saving radiant cooling and heating heat pump system comprises cold and heat source components and a circulating water system, wherein the circulating water system comprises a main circulating water pump (7), a water tank (8), a loop circulating water pump (9), a ground buried water supply header (11), a ground buried water return header (12), a wall buried water supply header (16), and a wall buried water return header (17); the cold and heat source components comprise a refrigerant-water heat exchanger; The cooling water outlet of the refrigerant-water heat exchanger (6) is connected to the main circulating water pump (7) and the connection port 1 at the lower end of the water tank (8) in sequence; the connection port 2 at the upper end of the water tank (8) is connected to the cooling water inlet of the refrigerant-water heat exchanger (6); the connection port 3 at the lower end of the water tank (8) is connected to the water inlet of the loop circulating water pump (9); the water inlet of the ground buried pipe water supply header (11) is connected in parallel with the water inlet of the wall buried pipe water supply header (16) and then connected to the water outlet of the loop circulating water pump (9); the water inlet of the ground buried pipe water supply header (11) is connected in parallel with the water inlet of the wall buried pipe water supply header (16); and a wall buried pipe water supply header (16) is provided on the pipeline. A water valve (10), the water outlet of the ground buried pipe return water header (12) is connected in parallel with the water outlet of the wall buried pipe return water header (17) and then connected to the connection port 4 at the upper end of the water tank (8), a ground buried pipe return water valve (18) is arranged on the parallel pipeline between the water outlet of the ground buried pipe return water header (12) and the water outlet of the wall buried pipe return water header (17), the water outlet of the ground buried pipe return water header (12) and the water inlet of the wall buried pipe supply water header (16) are connected through a pipeline, and a connecting valve (15) is arranged on the pipeline connecting the water outlet of the ground buried pipe return water header (12) and the water inlet of the wall buried pipe supply water header (16); The water outlet of the ground buried water supply header (11) and the water inlet of the ground buried water return header (12) are connected in parallel by a plurality of ground buried pipes (13), and the water outlet of the wall buried water supply header (16) and the water inlet of the wall buried water return header (17) are connected in parallel by a plurality of wall buried pipes (14); The energy-saving radiation cooling and heating heat pump system further comprises a system controller (19), an outdoor environment temperature sensor (20), a water tank temperature sensor (21), and a room air temperature sensor (22). The outdoor environment temperature sensor (20) is arranged outside the air-conditioned room to detect the outdoor environment temperature T w The water tank temperature sensor (21) is placed in the water tank (8) and is used to detect the actual water supply temperature T in the water tank (8). gs The room air temperature sensor (22) is arranged in the air-conditioned room to detect the actual room temperature T ns The main circulating water pump (7) and the loop circulating water pump (9) are connected to the system controller (19) through a line, the outdoor environment temperature sensor (20), the water tank temperature sensor (21), and the room air temperature sensor (22) are connected to the system controller (19) through a line, the wall buried pipe water supply valve (10), the connecting valve (15), and the ground buried pipe return valve (18) are all solenoid valves, the wall buried pipe water supply valve (10), the connecting valve (15), and the ground buried pipe return valve (18) are connected to the system controller (19) through a line, and the main circulating water pump (7) and the loop circulating water pump (9) are connected to the system controller (19) through a line; The cold and heat source components also include a compressor (1), a four-way valve (2), an outdoor heat exchanger (3), a throttle valve (4), and a gas-liquid separator (5); the liquid outlet end of the compressor (1) is connected to the D port of the four-way valve (2); the S port of the four-way valve (2) is connected to the liquid inlet of the gas-liquid separator (5); the liquid outlet of the gas-liquid separator (5) is connected to the liquid return port of the compressor (1); the E port of the four-way valve (2) is connected to the liquid inlet of the outdoor heat exchanger (3); the liquid outlet of the outdoor heat exchanger (3) is connected to the refrigerant inlet of the refrigerant-water heat exchanger (6); a throttle valve (4) is provided on the connecting pipeline between the liquid outlet of the outdoor heat exchanger (3) and the refrigerant inlet of the refrigerant-water heat exchanger (6); and the refrigerant outlet of the refrigerant-water heat exchanger (6) is connected to the C port of the four-way valve (2); The four-way valve (2) is a solenoid valve, and the four-way valve (2) is connected to the system controller (19) through a line; The interface 1 and the connection port 3 at the lower end of the water tank (8) are located on the opposite sides of the water tank; the connection port 2 and the connection port 4 at the upper end of the water tank (8) are located on the opposite sides of the water tank; The circulating water system control method is as follows: The system controller (19) controls the main circuit circulating water pump (7) to be in operation; (1) In the summer cooling operation, the system controller (19) controls the wall buried pipe water supply valve (10) and the ground buried pipe return valve (18) to open, and the connecting valve (15) to close, that is, the ground buried pipe (13) and the wall buried pipe (14) are connected in parallel; the circulating water in the water tank (8) is pumped into the refrigerant-water heat exchanger (6) by the main circulating water pump (7) and then flows to the water tank (8) after heat exchange and cooling with the refrigerant in the cold and heat source components. The circulating water in the water tank (8) Two routes, one route is divided into the ground buried pipe (13) through the ground buried pipe water supply header (11), then returns to the ground buried pipe return header (12), and then flows out through the ground buried pipe return valve (18); the other route flows into the wall buried pipe water supply header (16) through the wall buried pipe water supply header (16), then is divided into the wall buried pipe (14) through the wall buried pipe water supply header (16), then returns to the wall buried pipe return header (17) and flows out, and the two routes of return water are combined and returned to the water tank (8); (2) In winter heating operation, when the actual water supply temperature T gs Higher than the switching temperature T set by the system controller (19) qh When the ground buried pipe (13) and the wall buried pipe (14) supply water in parallel, the system controller (19) controls the wall buried pipe water supply valve (10) and the ground buried pipe return valve (18) to open, and the connecting valve (15) to close; When the actual water supply temperature T gs Below the switching temperature T qh When water is supplied in series, the switching temperature T qh The setting range is 30-40°C. When the ground buried pipe (13) and the wall buried pipe (14) are connected in series to supply water, the system controller (19) controls the wall buried pipe water supply valve (10) and the ground buried pipe return valve (18) to be closed, and the connecting valve (15) to be opened, so that the circulating water in the water tank (8) is pumped into the refrigerant-water heat exchanger (6) by the main circulating water pump (7) to exchange heat with the refrigerant in the cold and heat source equipment. After being heated, the circulating water flows to the water tank (8), and the circulating water in the water tank (8) is diverted to the ground buried pipe (13) through the ground buried pipe water supply header (11), and then returns to the ground buried pipe return header (12), and then flows to the wall buried pipe water supply header (16) through the connecting valve (15), and then diverted to the wall buried pipe (14) through the wall buried pipe water supply header (16), and then returns to the wall buried pipe return header (17) and returns to the water tank (8); The control steps for achieving cooling or heating operation by controlling the four-way valve (2) in the cold and heat source components are as follows: (1) In the cooling operation in summer, the four-way valve (2) is controlled to be in the cooling mode, that is, the D port of the four-way valve (2) is connected to the E port, and the C port is connected to the S port. The refrigerant flows through the compressor (1) to the D port of the four-way valve (2), and flows through the E port to the outdoor heat exchanger (3) for condensation. The condensed refrigerant is throttled and reduced in pressure by the throttle valve (4) to the refrigerant-water heat exchanger (6). In the refrigerant-water heat exchanger (6), the refrigerant exchanges heat with the circulating water in the circulating water system. The refrigerant evaporates and absorbs heat, and the circulating water is cooled. The refrigerant continues to flow to the C port of the four-way valve (2), and then flows through the S port to the gas-liquid separator (5) and returns to the compressor (1). (2) During winter heating operation, the four-way valve (2) is controlled to switch to the heating mode, that is, the D port of the four-way valve (2) is connected to the E port, and the C port is connected to the S port. The refrigerant flows through the compressor (1) to the D port of the four-way valve (2), and flows through the C port to the refrigerant-water heat exchanger (6) for condensation. In the refrigerant-water heat exchanger (6), the refrigerant exchanges heat with the circulating water in the circulating water system. The refrigerant condenses and releases heat, and the circulating water is heated. The condensed refrigerant is throttled and depressurized by the throttle valve (4) and flows to the outdoor heat exchanger (3) for evaporation. The evaporated refrigerant flows to the E port of the four-way valve (2), and then flows through the S port to the gas-liquid separator (5) and returns to the compressor (1).

2. The control method of the energy-saving radiation cooling and heating heat pump system according to claim 1, characterized in that: In summer cooling operation, when the actual water supply temperature T gs ≤T´ gs When the actual water supply temperature T gs >T´ gs When the system controller (19) compressor (1) is turned on; when the actual water supply temperature T gs ≥T´ gs +2℃, the system controller (19) controls the compressor (1) to stop running; when the actual water supply temperature T gs <T´ gs When the system controller (19) controls the compressor (1) to start; the theoretical water supply temperature T´ gs The determination method is as follows: (1) In summer cooling operation, the theoretical water supply temperature is T´ gs =50-T w ; (2) When heating in winter, the theoretical water supply temperature is T´ gs =37.5-0.5T w .

3. The control method of the energy-saving radiation cooling and heating heat pump system according to claim 2, characterized in that: The controller (19) also detects the actual room temperature T ns With room set temperature T´ ns The comparison situation is used to control the start or stop of the loop circulating water pump (9): in the summer cooling operation, when the actual temperature of the air-conditioned room is T ns ≤Room set temperature T´ ns When the actual temperature of the air-conditioned room is T ns >Room set temperature T´ ns When the system is running in winter, when the actual temperature of the air-conditioned room is T ns ≥Room set temperature T´ ns +2℃, the loop water pump (9) stops running. When the actual temperature of the air-conditioned room is T ns <Room set temperature T´ ns When the loop water pump (9) starts to operate.

4. The control method of the energy-saving radiation cooling and heating heat pump system according to claim 2 or 3, characterized in that: The switching temperature T qh is 37℃.

5. The control method of the energy-saving radiation cooling and heating heat pump system according to claim 3, characterized in that: During the operation of the radiant cooling and heating heat pump system, regardless of whether the compressor (1) is turned on or off, the main circuit circulating water pump (7) is always in operation.

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