CN111156635B - Energy-saving radiation cooling and heating heat pump system and control method - Google Patents
Energy-saving radiation cooling and heating heat pump system and control method Download PDFInfo
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- CN111156635B CN111156635B CN202010163198.0A CN202010163198A CN111156635B CN 111156635 B CN111156635 B CN 111156635B CN 202010163198 A CN202010163198 A CN 202010163198A CN 111156635 B CN111156635 B CN 111156635B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 49
- 238000001816 cooling Methods 0.000 title claims abstract description 30
- 230000005855 radiation Effects 0.000 title claims description 17
- 238000000034 method Methods 0.000 title claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 455
- 239000003507 refrigerant Substances 0.000 claims description 47
- 239000007788 liquid Substances 0.000 claims description 38
- 238000004891 communication Methods 0.000 claims description 21
- 238000004378 air conditioning Methods 0.000 claims description 10
- 239000000498 cooling water Substances 0.000 claims description 7
- 238000005057 refrigeration Methods 0.000 claims description 6
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 230000005494 condensation Effects 0.000 description 6
- 238000009833 condensation Methods 0.000 description 6
- 238000004134 energy conservation Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
- F24F11/67—Switching between heating and cooling modes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/85—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using variable-flow pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/40—Geothermal heat-pumps
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Other Air-Conditioning Systems (AREA)
- Air Conditioning Control Device (AREA)
Abstract
本申请公开一种节能型辐射供冷供暖热泵系统，包括冷、热源部件、循环水系统，所述的循环水系统包括水箱，所述的冷、热源部件包括制冷剂‑水换热器；所述的制冷剂‑水换热器的与水箱进行热交换，水箱的与地面埋管和壁面埋管连接，地面埋管和壁面埋管采用可切换串联或者并联的管路连接，根据系统控制器设定的切换温度实现地面埋管和壁面埋管的串并联连接切换，同时根据室外环境温度调整制冷剂‑水换热器的供热或者供冷量，在实现节能环保的同时，提高了人在空调房间内的舒适性。
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 realized 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
The invention relates to a radiation cold-supplying and heating heat pump system and a control method, and relates to the technical field of heat pump/refrigeration energy conservation.
Background
Heat pump hot water radiant heating systems are increasingly being used due to the high efficiency and energy conservation of the heat pump systems and the good thermal comfort of radiant heating. With the improvement of the living standard of people, the thermal comfort of cooling in summer is also increasingly concerned, so radiation cooling with good thermal comfort is also more and more concerned. A host machine is used for realizing radiation cooling and heating heat pump systems for radiation cooling in summer and radiation heating in winter, and has been developed rapidly. The main technical problems faced in the technical development process are that the thermal comfort is better, and the system operation is more efficient and energy-saving. The radiation cold-supplying and heat-supplying heat pump system adopts a constant-temperature water supply mode at present, namely, the cold water supply temperature and the hot water supply temperature are determined according to the designed highest environmental temperature in summer and the designed lowest environmental temperature in winter. Because the outdoor environment temperature changes greatly in the whole summer refrigerating season and the whole winter heating season and the cold and heat loads change greatly, the mode of changing the water supply temperature can be adopted, namely, when the summer environment temperature is reduced, the cold water supply temperature is properly increased, and when the winter environment temperature is increased, the hot water supply temperature is properly reduced, so that the system operation energy efficiency can be improved, and the purpose of operation energy conservation is achieved. However, when the environmental temperature is high in winter, the water supply temperature can be reduced properly, if a buried pipe mode is adopted, the ground temperature can be lower than the recommended thermal comfort temperature value of the human body, and the comfort level is reduced. Therefore, a technology is needed to be provided, namely the radiation cold-supply heating heat pump system can be operated to save energy by adjusting the water supply temperature as much as possible, and meanwhile, the requirement of human body thermal comfort can be better met.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an energy-saving radiation cooling and heating heat pump system, which realizes radiation refrigeration in summer and radiation heating in winter, can regulate the temperature of cooling water in summer and heating water in winter according to the outdoor environment temperature, adopts ground buried pipes and wall buried pipes to be switched in series and parallel when a hot water supply greenhouse is regulated in winter, ensures the temperature of the ground, and simultaneously meets the requirements of human body thermal comfort of an air-conditioning room when the energy-saving effect is realized.
In order to achieve the aim, the invention discloses an energy-saving radiation cold and heat supply heat pump system, which comprises a cold and heat source component 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 pipe water supply header 11, a ground buried pipe water return header 12, a wall buried pipe water supply header 16 and a wall buried pipe water return header 17;
The cooling water outlet of the refrigerant-water heat exchanger 6 is sequentially connected with the main circuit circulating water pump 7 and a first connecting port at the lower end of the water tank 8, a second connecting port at the upper end of the water tank 8 is connected with a cooling water inlet of the refrigerant-water heat exchanger 6, a third connecting port at the lower end of the water tank 8 is connected with a water inlet of the loop circulating water pump 9, a water inlet of the ground buried pipe water supply header 11 is connected with a water inlet of the wall buried pipe water supply header 16 in parallel and then is connected with a water outlet of the loop circulating water pump 9, a wall buried pipe water supply valve 10 is arranged on a parallel pipeline of the water inlet of the ground buried pipe water supply header 11 and the water inlet of the wall buried pipe water supply header 16, a fourth connecting port at the upper end of the water tank 8 is connected with a water outlet of the wall buried pipe water return header 17 in parallel, a ground buried pipe water return header 12 and a water outlet parallel pipeline of the wall buried pipe water return header 17 are provided with a ground buried pipe water return valve 18, a water outlet of the ground pipe water return header 12 and a water inlet of the wall buried pipe water supply header 16 are connected through a pipeline, and a water inlet of the ground buried pipe header 12 and a water supply pipe water return pipe water supply pipeline 15 is provided with a water inlet connection pipe 15;
The water outlet of the ground buried pipe water supply header 11 is connected in parallel with the water inlet of the ground buried pipe water return header 12 through a plurality of ground buried pipes 13, and the water outlet of the wall buried pipe water supply header 16 is connected in parallel with the water inlet of the wall buried pipe water return header 17 through a plurality of wall buried pipes 14.
Preferably, the energy-saving radiant 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, wherein the outdoor environment temperature sensor 20 is arranged outside the air-conditioning room and is used for detecting the outdoor environment temperature T w, the water tank temperature sensor 21 is arranged in the water tank 8 and is used for detecting the actual water supply temperature T gs in the water tank 8, the room air temperature sensor 22 is arranged in the air-conditioning room and is used for detecting the actual room temperature T ns, the main circulating water pump 7 and the loop circulating water pump 9 are connected with the system controller 19 through a circuit, the outdoor environment temperature sensor 20, the water tank temperature sensor 21 and the room air temperature sensor 22 are connected with the system controller 19 through a circuit, the wall buried pipe water supply valve 10, the communication valve 15 and the ground buried pipe water return valve 18 are all electromagnetic valves, the wall buried pipe water supply valve 10, the communication valve 15 and the ground pipe water return valve 18 are connected with the system controller 19 through a circuit, and the main circulating water pump 7 and the loop circulating water pump 9 are connected with the system controller 19 through a circuit.
Preferably, the cold and heat source component further comprises a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a throttle valve 4 and a gas-liquid separator 5, wherein the liquid outlet end of the compressor 1 is connected with the D port of the four-way valve 2, the S port of the four-way valve 2 is connected with the liquid inlet of the gas-liquid separator 5, the liquid outlet of the gas-liquid separator 5 is connected with the liquid return port of the compressor 1, the E port of the four-way valve 2 is connected with the liquid inlet of the outdoor heat exchanger 3, the liquid outlet of the outdoor heat exchanger 3 is connected with the refrigerant inlet of the refrigerant-water heat exchanger 6, the throttle valve 4 is arranged on the refrigerant inlet connecting pipeline of 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 with the C port of the four-way valve 2.
Preferably, the four-way valve 2 is an electromagnetic valve, and the four-way valve 2 is connected with the system controller 19 through a circuit.
Preferably, the first connector and the third connector at the lower end of the water tank 8 are positioned at the opposite sides of the water tank, and the second connector and the fourth connector at the upper end of the water tank 8 are positioned at the opposite sides of the water tank.
Preferably, the control method of the energy-saving radiant cooling and heating heat pump system comprises the following steps of:
The system controller 19 controls the main circulating water pump 7 to be always in an operating state;
(1) When the system is used for refrigerating in summer, the system controller 19 controls the wall buried pipe water supply valve 10 and the ground buried pipe water return valve 18 to be opened, and the communication valve 15 is closed, namely the ground buried pipe 13 and the wall buried pipe 14 are connected in parallel, circulating water for the water tank 8 is pumped into the refrigerant-water heat exchanger 6 by the main circulating water pump 7, flows into the water tank 8 after heat exchange and cooling with the refrigerant in the cold and heat source components, two paths of circulating water in the water tank 8 are divided into the ground buried pipe 13 by the ground buried pipe water supply header 11, then returned to the ground buried pipe water return header 12 and then flows out by the ground buried pipe water return valve 18, and the other path of circulating water flows into the wall buried pipe water supply header 16 by the wall buried pipe water supply header 16 and then flows out after returning to the wall buried pipe water return header 17, and the two paths of water return to the water tank 8 are combined;
(2) When the actual water supply temperature T gs is higher than the switching temperature T qh set by the system controller 19 in heating operation in winter, the ground buried pipe 13 and the wall buried pipe 14 are supplied with water in a parallel mode, namely the system controller 19 controls the wall buried pipe water supply valve 10 and the ground buried pipe water return valve 18 to be opened, and the communication valve 15 is closed;
When the actual water supply temperature T gs is lower than the switching temperature T qh, water is supplied in a serial manner, the setting range of the switching temperature T qh is 30-40 ℃, when the ground buried pipe 13 and the wall buried pipe 14 are supplied in a serial manner, the system controller 19 controls the wall buried pipe water supply valve 10 and the ground buried pipe water return valve 18 to be closed, the communication valve 15 is opened, circulating water in the water tank 8 is pumped into the refrigerant-water heat exchanger 6 by the main circuit circulating water pump 7 to exchange heat with the refrigerant in the cold and heat source equipment and then flows into the water tank 8, the circulating water in the water tank 8 is shunted to the ground buried pipe 13 by the ground buried pipe water supply header 11 and then returns to the ground buried pipe header 12, flows to the wall buried pipe water supply header 16 by the communication valve 15 and shunted to the wall buried pipe 14 by the wall buried pipe water supply header 16 and then returns to the wall buried pipe water return header 17, and then returns to the water tank 8;
the control steps for realizing refrigeration or heating operation by controlling the four-way valve (2) in the cold and heat source components are as follows:
(1) When the refrigerating operation is performed in summer, the four-way valve 2 is controlled to be in a refrigerating mode, namely, the port D of the four-way valve 2 is communicated with the port E, the port C is communicated with the port S, the refrigerant flows to the port D of the four-way valve 2 through the compressor 1, flows to the outdoor heat exchanger 3 through the port E for condensation, the condensed refrigerant is throttled and depressurized to the refrigerant-water heat exchanger 6 through the throttle valve 4, in the refrigerant-water heat exchanger 6, the refrigerant exchanges heat with circulating water in a circulating water system, the refrigerant evaporates and absorbs heat, the circulating water cools down, the refrigerant continuously flows to the port C of the four-way valve 2, then flows to the gas-liquid separator 5 through the port S, and finally returns to the compressor 1;
(2) When the four-way valve 2 is controlled to switch to a heating mode in winter during heating operation, namely, the D port and the E port of the four-way valve 2 are communicated, the C port and the S port of the four-way valve 2 are communicated, the refrigerant flows to the D port of the four-way valve 2 through the compressor 1, flows to the refrigerant-water heat exchanger 6 through the C port for condensation, heat exchange is carried out between the refrigerant and circulating water in the circulating water system in the refrigerant-water heat exchanger 6, the refrigerant is heated by condensation heat release, the circulating water is heated, the condensed refrigerant is throttled and depressurized through 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, then flows to the gas-liquid separator 5 through the S port, and finally returns to the compressor 1.
Preferably, the system controller 19 controls the compressor 1 to stop operating when the actual water supply temperature T gs≤T′gs -2 ℃ is performed during the cooling operation in summer, the system controller 19 controls the compressor 1 to be turned on when the actual water supply temperature T gs＞T′gs is performed during the heating operation in winter, the system controller 19 controls the compressor 1 to stop operating when the actual water supply temperature T gs≥T′gs +2 ℃ is performed during the cooling operation in winter, the system controller 19 controls the compressor 1 to be turned on when the actual water supply temperature T gs＜T′gs is performed, and the theoretical water supply temperature T' gs is determined as follows:
(1) When in refrigeration operation in summer, the theoretical water supply temperature T' gs＝50-Tw;
(2) In heating operation in winter, the theoretical water supply temperature T' gs＝37.5-0.5Tw.
Preferably, the controller 19 also controls the on or off of the loop circulating water pump 9 by detecting the comparison of the room actual temperature T ns and the room set temperature T ' ns, wherein the loop circulating water pump 9 stops when the air-conditioning room actual temperature T ns is less than or equal to the room set temperature T ' ns -2 ℃ during the cooling operation in summer, the loop circulating water pump 9 starts to operate when the air-conditioning room actual temperature T ns is greater than the room set temperature T ' ns, and the loop circulating water pump 9 stops when the air-conditioning room actual temperature T ns is greater than or equal to the room set temperature T ' ns +2 ℃ during the heating operation in winter of the system, and the loop circulating water pump 9 starts to operate when the air-conditioning room actual temperature T ns is less than the room set temperature T ' ns.
Preferably, the switching temperature T qh is 37 ℃.
Preferably, during the operation of the radiant cooling heating heat pump system, the main circulation water pump 7 is always in operation, regardless of whether the compressor 1 is on or off.
Compared with the prior art, the invention has the following advantages:
(1) When the ambient temperature in summer is higher than the design ambient temperature, the system reduces the temperature of hot water supply, improves the running energy efficiency of the system and achieves the purpose of running energy conservation;
(2) In order to improve the thermal comfort of a room, the ground buried pipe and the wall buried pipe are arranged at the same time, and the circulating water system realizes the parallel connection or series connection operation of the ground buried pipe and a wall buried pipe waterway by controlling the opening and closing of a wall buried pipe water supply valve, a communication valve and a ground buried pipe water return valve. When the refrigerating operation is performed in summer, the ground buried pipe and the wall buried pipe waterway are operated in parallel;
(3) When the water supply temperature is low, the ground buried pipe and the wall buried pipe waterway are operated in a series mode, namely circulating water passes through the ground buried pipe and then passes through the wall buried pipe, and compared with the parallel mode, the average temperature of the ground buried pipe is improved, and the thermal comfort is ensured;
Drawings
Fig. 1 is a schematic diagram of a radiant cooling and heating heat pump system embodying the present invention.
The reference numerals are 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 surface buried pipe water supply valve, 11-ground buried pipe water supply header, 12-ground buried pipe backwater header, 13-ground buried pipe, 14-wall surface buried pipe, 15-communication valve, 16-wall surface buried pipe water supply header, 17-wall surface buried pipe backwater header, 18-ground buried pipe backwater valve, 19-system controller, 20-outdoor environment temperature sensor, 21-water tank temperature sensor and 22-room air temperature sensor.
Detailed Description
Embodiments of the present invention are described in detail below, an example of which is shown in FIG. 1. The embodiment described below by referring to fig. 1 is exemplary only for explaining the present invention and is not to be construed as limiting the present invention.
As shown in fig. 1, the energy-saving radiation cooling and heating heat pump system of the invention comprises 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 water return header 12, a ground-buried pipe 13, a wall-buried pipe 14, a communication valve 15, a wall-buried pipe water supply header 16, a wall-buried pipe water return header 17, a ground-buried pipe water return valve 18, a system controller 19, an outdoor environment temperature sensor 20, a water tank temperature sensor 21 and a room air temperature sensor 22.
The cold and heat source components comprise 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, wherein the liquid outlet end of the compressor 1 is connected with the D port of the four-way valve 2, the S port of the four-way valve 2 is connected with the liquid inlet of the gas-liquid separator 5, the liquid outlet of the gas-liquid separator 5 is connected with the liquid return port of the compressor 1, the E port of the four-way valve 2 is connected with the liquid inlet of the outdoor heat exchanger 3, the liquid outlet of the outdoor heat exchanger 3 is connected with the refrigerant inlet of the refrigerant-water heat exchanger 6, the throttle valve 4 is arranged on the connecting pipeline of 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 with the C port of the four-way valve 2.
The cold and heat source components realize refrigeration or heating operation by controlling the four-way valve 2, and the operation flow of the cold and heat source components is as follows:
(1) When the refrigerating operation is performed in summer, the four-way valve 2 is controlled to be in a refrigerating mode, namely, the port D of the four-way valve 2 is communicated with the port E, the port C is communicated with the port S, the refrigerant flows to the port D of the four-way valve 2 through the compressor 1, flows to the outdoor heat exchanger 3 through the port E for condensation, the condensed refrigerant is throttled and depressurized to the refrigerant-water heat exchanger 6 through the throttle valve 4, in the refrigerant-water heat exchanger 6, the refrigerant exchanges heat with circulating water in a circulating water system, the refrigerant evaporates and absorbs heat, the circulating water cools down, the refrigerant continuously flows to the port C of the four-way valve 2, then flows to the gas-liquid separator 5 through the port S, and finally returns to the compressor 1;
(2) When the four-way valve 2 is controlled to switch to a heating mode in winter during heating operation, namely, the D port and the E port of the four-way valve 2 are communicated, the C port and the S port of the four-way valve 2 are communicated, the refrigerant flows to the D port of the four-way valve 2 through the compressor 1, flows to the refrigerant-water heat exchanger 6 through the C port for condensation, heat exchange is carried out between the refrigerant and circulating water in the circulating water system in the refrigerant-water heat exchanger 6, the refrigerant is heated by condensation heat release, the circulating water is heated, the condensed refrigerant is throttled and depressurized through 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, then flows to the gas-liquid separator 5 through the S port, and finally returns to the compressor 1.
The circulating water system comprises 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 water return header 12, a ground buried pipe 13, a wall buried pipe 14, a communication valve 15, a wall buried pipe water supply header 16, a wall buried pipe water return header 17 and a ground buried pipe water return valve 18, and provides cold and heat for an air-conditioning room.
The cooling water outlet of the refrigerant-water heat exchanger 6 is sequentially connected with the main circuit circulating water pump 7 and a first connecting port at the lower end of the water tank 8, a second connecting port at the upper end of the water tank 8 is connected with a cooling water inlet of the refrigerant-water heat exchanger 6, a third connecting port at the lower end of the water tank 8 is connected with a water inlet of the loop circulating water pump 9, a water inlet of the ground buried pipe water supply header 11 is connected with a water inlet of the wall buried pipe water supply header 16 in parallel and then is connected with a water outlet of the loop circulating water pump 9, a wall buried pipe water supply valve 10 is arranged on a parallel pipeline of the water inlet of the ground buried pipe water supply header 11 and the water inlet of the wall buried pipe water supply header 16, a water outlet of the ground buried pipe water return header 12 is connected with a fourth connecting port at the upper end of the water tank 8 after being connected with a water outlet of the wall buried pipe water return header 17 in parallel, a water tank temperature sensor 21 is arranged in the water tank 8, a water return valve 18 is arranged on a parallel pipeline of the ground buried pipe water return header 12 and a water outlet of the wall buried pipe water return header 17, a water outlet of the ground buried pipe water return 12 is connected with a water inlet of the wall buried pipe water supply header 16 through a pipeline, and a water return valve 15 is arranged on the water inlet of the ground buried pipe water return pipe header 16.
The first connector and the third connector at the lower end of the water tank 8 are positioned at the opposite sides of the water tank, and the second connector and the fourth connector at the upper end of the water tank 8 are positioned at the opposite sides of the water tank.
The water outlet of the ground buried pipe water supply header 11 is connected in parallel with the water inlet of the ground buried pipe water return header 12 through more than one ground buried pipe 13, and the water outlet of the wall buried pipe water supply header 16 is connected in parallel with the water inlet of the wall buried pipe water return header 17 through more than one wall buried pipe 14.
The four-way valve 2, the wall buried pipe water supply valve 10, the communication valve 15 and the ground buried pipe water return valve 18 are all electromagnetic valves, the wall buried pipe water supply valve 10, the communication valve 15 and the ground buried pipe water return valve 18 are connected with the system controller 19 through lines, the main circulating water pump 7 and the loop circulating water pump 9 are connected with the system controller 19 through lines, and the outdoor environment temperature sensor 20, the water tank temperature sensor 21 and the room air temperature sensor 22 are connected with the system controller 19 through lines.
The operation flow of the circulating water system is as follows:
(1) In the cooling operation in summer, the system controller 19 controls the wall buried pipe water supply valve 10 and the ground buried pipe water return valve 18 to be opened, the communication valve 15 is closed, namely, the ground buried pipe 13 and the wall buried pipe 14 are connected in parallel, circulating water is pumped into the refrigerant-water heat exchanger 6 by the main circulating water pump 7, flows into the water tank 8 after heat exchange and temperature reduction with the refrigerant in the cold and heat source components, two circulating water paths in the water tank 8 are divided into the ground buried pipe 13 by the ground buried pipe water supply header 11, then returns to the ground buried pipe water return header 12 and flows out by the ground buried pipe water return valve 18, the other path flows into the wall buried pipe water supply header 16 by the wall buried pipe water supply header 16, then returns to the wall buried pipe water return header 17 and then flows out, and the two circulating water returns to the water return pipe, and finally returns to the water tank 8.
(2) When the actual water supply temperature T gs is higher than the switching temperature T qh set by the system controller 19 in heating operation in winter, the ground buried pipe 13 and the wall buried pipe 14 are supplied with water in a parallel mode, when the actual water supply temperature T gs is lower than the switching temperature T qh, the water is supplied in a serial mode to improve the ground temperature and provide the comfort of indoor people, and the setting range of the switching temperature T qh is 30-40 ℃, particularly preferably 37 ℃. When the ground buried pipe 13 and the wall buried pipe 14 are supplied in parallel, the circulation water flow is the same as the circulation water flow during the cooling in summer. When the ground buried pipe 13 and the wall buried pipe 14 are supplied with water in a serial connection mode, the circulating water Cheng Ruxia is formed by closing the wall buried pipe water supply valve 10 and the ground buried pipe water return valve 18, opening the communication valve 15, pumping the circulating water into the refrigerant-water heat exchanger 6 by the main circulating water pump 7, exchanging heat with the refrigerant in the cold and heat source equipment, heating and flowing to the water tank 8, and the circulating water in the water tank 8 is all distributed to the ground buried pipe 13 by the ground buried pipe water supply header 11, then returns to the ground buried pipe water return header 12, flows to the wall buried pipe water supply header 16 by the communication valve 15, is distributed to the wall buried pipe 14 by the wall buried pipe water supply header 16, then returns to the wall buried pipe water return header 17 and then enters the circulating water return pipe, and finally returns to the water tank 8.
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, and the temperature sensed by the room air temperature sensor 22 is the actual room temperature T ns. The system controller 19 detects the receiving outdoor ambient temperature T w and determines the required theoretical water supply temperature T 'gs, and controls the on-off of the compressor 1 according to the comparison of the actual water supply temperature T gs and the theoretical water supply temperature T' gs. When the system is in cooling operation in summer, the compressor 1 stops operating when the actual water supply temperature T gs≤T′gs -2 ℃ is reached, and the compressor 1 is started when the actual water supply temperature T gs＞T′gs is reached. When the system is in heating operation in winter, the compressor 1 stops operating when the actual water supply temperature T gs≥T′gs +2 ℃ is reached, and the compressor 1 is started when the actual water supply temperature T gs＜T′gs is reached. The theoretical water supply temperature T' gs is determined as follows:
(1) In the cooling operation in summer, in this embodiment, for example, the outdoor environment temperature is designed to be 35 ℃, the corresponding design water supply temperature is 15 ℃, and the theoretical water supply temperature T' gs＝50-Tw;
(2) In winter heating operation, in this embodiment, for example, the outdoor environment temperature is designed to be-15 ℃, the corresponding design water supply temperature is 45 ℃, and the theoretical water supply temperature T' gs＝37.5-0.5Tw.
The controller 19 also controls the on and off of the loop circulating water pump 9 by detecting the comparison of the room actual temperature T ns and the room set temperature T' ns. When the system is operated in a refrigerating mode in summer, when the actual room temperature T ns of the air conditioner is less than or equal to the set room temperature T 'ns -2 ℃, the loop circulating water pump 9 stops operating, and when the actual room temperature T ns of the air conditioner is greater than the set room temperature T' ns, the loop circulating water pump 9 starts operating. When the system is in heating operation in winter, when the actual room temperature T ns of the air conditioner is more than or equal to the set room temperature T 'ns +2 ℃, the loop circulating water pump 9 stops operating, and when the actual room temperature T ns of the air conditioner is less than the set room temperature T' ns, the loop circulating water pump 9 starts operating.
During the operation of the radiant cooling heating heat pump system, the main circulating water pump 7 is always in an operating state regardless of whether the compressor 1 is on or off.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made hereto without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (5)
1. A control method of an energy-saving radiation cold-supplying heating heat pump system is characterized in that the energy-saving radiation cold-supplying heating heat pump system comprises a cold source component, a heat source component 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 pipe water supply header (11), a ground buried pipe water return header (12), a wall buried pipe water supply header (16) and a wall buried pipe water return header (17), and the cold source component and the heat source component comprise a refrigerant-water heat exchanger;
The cooling water outlet of the refrigerant-water heat exchanger (6) is sequentially connected with a main circulating water pump (7) and a first connecting port at the lower end of a water tank (8), a second connecting port at the upper end of the water tank (8) is connected with a cooling water inlet of the refrigerant-water heat exchanger (6), a third connecting port at the lower end of the water tank (8) is connected with a water inlet of a loop circulating water pump (9), a water inlet of a ground buried water supply header (11) and a water inlet of a wall buried water supply header (16) are connected in parallel and then are connected with a water outlet of the loop circulating water pump (9), a wall buried water supply valve (10) is arranged on a water inlet parallel pipeline of the ground buried water supply header (11) and the wall buried water supply header (16), a water outlet of the ground buried water return header (12) and a water outlet of the wall buried water return header (17) are connected in parallel and then are connected with a fourth connecting port at the upper end of the water tank (8), a water outlet of the ground buried water return header (12) and a water outlet of the wall buried water return header (17) are connected with a water inlet of the water return pipe (16) through a water return pipe (15) of the water return pipe of the water supply header (16);
The water outlet of the ground buried pipe water supply header (11) is connected in parallel with the water inlet of the ground buried pipe water return header (12) through a plurality of ground buried pipes (13), and the water outlet of the wall buried pipe water supply header (16) is connected in parallel with the water inlet of the wall buried pipe water return header (17) through 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), wherein the outdoor environment temperature sensor (20) is arranged outside an air-conditioning room and used for detecting the outdoor environment temperature T w, the water tank temperature sensor (21) is arranged in the water tank (8) and used for detecting the actual water supply temperature T gs in the water tank (8), the room air temperature sensor (22) is arranged in the air-conditioning room and used for detecting the actual room temperature T ns, the main circulating water pump (7) and the loop circulating water pump (9) are connected with the system controller (19) through a circuit, the outdoor environment temperature sensor (20), the water tank temperature sensor (21) and the room air temperature sensor (22) are connected with the system controller (19) through a circuit, and the wall surface buried pipe valve (10), the communication valve (15) and the ground pipe water return valve (18) are all electromagnetic valves, and the wall surface buried pipe valve (10), the communication valve (15) and the ground pipe water return valve (18) are connected with the main circulating water pump (19) through the circuit and the main circulating water pump (19);
The cold and heat source component further comprises a compressor (1), a four-way valve (2), an outdoor heat exchanger (3), a throttle valve (4) and a gas-liquid separator (5), wherein the liquid outlet end of the compressor (1) is connected with the D port of the four-way valve (2), the S port of the four-way valve (2) is connected with the liquid inlet of the gas-liquid separator (5), the liquid outlet of the gas-liquid separator (5) is connected with the liquid return port of the compressor (1), the E port of the four-way valve (2) is connected with the liquid inlet of the outdoor heat exchanger (3), the liquid outlet of the outdoor heat exchanger (3) is connected with the refrigerant inlet of the refrigerant-water heat exchanger (6), and the throttle valve (4) is arranged on a refrigerant inlet connecting pipeline of 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 with the C port of the four-way valve (2);
The four-way valve (2) is an electromagnetic valve, and the four-way valve (2) is connected with the system controller (19) through a circuit;
the first connector and the third connector at the lower end of the water tank (8) are positioned at the opposite side of the water tank, and the second connector and the fourth connector at the upper end of the water tank (8) are positioned at the opposite side of the water tank;
The control method of the circulating water system comprises the following steps:
A system controller (19) controls the main circulating water pump (7) to be in an operating state;
(1) When the system is used for refrigerating in summer, a system controller (19) controls a wall surface buried pipe water supply valve (10) and a ground buried pipe water return valve (18) to be opened, a communication valve (15) is closed, namely, a ground buried pipe (13) and a wall surface buried pipe (14) are connected in parallel, circulating water in a water tank (8) is pumped into a refrigerant-water heat exchanger (6) by a main circulating water pump (7), exchanges heat with a refrigerant in a cold heat source component and a heat source component and then flows into the water tank (8), two circulating water in the water tank (8) flows out after being cooled, one path of circulating water is shunted to a ground buried pipe (13) by the ground buried pipe water supply header (11) and then returns to a ground buried pipe water return header (12) and flows out by the ground buried pipe water return valve (18), the other path of circulating water flows to the wall surface buried pipe water supply header (16) by the wall surface buried pipe water supply header (16), and returns to the wall surface buried pipe header (17) after being combined, and the two paths of circulating water return water returns to the water tank (8) after being combined;
(2) When the actual water supply temperature T gs is higher than the switching temperature T qh set by the system controller (19) in heating operation in winter, the ground buried pipe (13) and the wall buried pipe (14) are supplied with water in a parallel mode, namely the system controller (19) controls the wall buried pipe water supply valve (10) and the ground buried pipe water return valve (18) to be opened, and the communication valve (15) is closed;
when the actual water supply temperature T gs is lower than the switching temperature T qh, water is supplied in a serial manner, the setting range of the switching temperature T qh is 30-40 ℃, when the ground buried pipe (13) and the wall buried pipe (14) are supplied in the serial manner, the system controller (19) controls the wall buried pipe water supply valve (10) and the ground buried pipe water return valve (18) to be closed, the communication valve (15) is opened, circulating water in the water tank (8) is pumped into the refrigerant-water heat exchanger (6) by the main circulating water pump (7), exchanges heat with the refrigerant in the cold and heat source equipment and then flows into the water tank (8), the circulating water in the water tank (8) is shunted to the ground buried pipe (13) through the ground buried pipe water supply header (11), then returns to the ground buried pipe water return header (12), flows to the wall buried pipe water supply header (16) through the communication valve (15), shunts to the wall buried pipe water return header (14) through the wall buried pipe water return header (16), and then returns to the water tank (8) after the main circulating water in the water tank (8) is pumped into the wall buried pipe header (17);
The control steps for realizing refrigeration or heating operation by controlling the four-way valve (2) in the cold and heat source components are as follows:
When the refrigerating machine is operated in summer, the four-way valve (2) is controlled to be in a refrigerating mode, namely, a D port and an E port of the four-way valve (2) are communicated, a C port and an S port of the four-way valve are communicated, a refrigerant flows to the D port of the four-way valve (2) through the compressor (1), flows to the outdoor heat exchanger (3) through the E port to be condensed, the condensed refrigerant is throttled and depressurized to the refrigerant-water heat exchanger (6) through the throttle valve (4), in the refrigerant-water heat exchanger (6), the refrigerant exchanges heat with circulating water in a circulating water system, the refrigerant evaporates and absorbs heat, the circulating water is cooled, the refrigerant continuously flows to the C port of the four-way valve (2), and then flows to the gas-liquid separator (5) through the S port to return to the compressor (1);
(2) When heating in winter, the four-way valve (2) is controlled to switch to a heating mode, namely, the D port and the E port of the four-way valve (2) are communicated, the C port and the S port of the four-way valve (2) are communicated, the refrigerant flows to the D port of the four-way valve (2) through the compressor (1), flows to the refrigerant-water heat exchanger (6) through the C port to be condensed, the refrigerant exchanges heat with circulating water in a circulating water system in the refrigerant-water heat exchanger (6), the refrigerant condenses to release heat, the circulating water heats up, the condensed refrigerant is throttled and depressurized to the outdoor heat exchanger (3) through the throttle valve (4) to be evaporated, 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 to return to the compressor (1).
2. The control method of an energy-saving radiant cooling and heating heat pump system according to claim 1, wherein the system controller (19) controls the compressor (1) to stop operating when the actual water supply temperature T gs≤T´gs -2 ℃ is performed during the cooling operation in summer, the system controller (19) controls the compressor (1) to be started when the actual water supply temperature T gs＞T´gs is performed, the system controller (19) controls the compressor (1) to stop operating when the actual water supply temperature T gs≥T´gs +2 ℃ is performed during the heating operation in winter, the system controller (19) controls the compressor (1) to be started when the actual water supply temperature T gs＜T´gs is performed, and the theoretical water supply temperature T ́ gs is determined as follows:
(1) When the refrigerating operation is performed in summer, the theoretical water supply temperature T ́ gs=50-Tw;
(2) In heating operation in winter, the theoretical water supply temperature T ́ gs=37.5-0.5Tw.
3. The control method of an energy-saving radiant cooling and heating heat pump system according to claim 2, wherein the controller (19) further controls the on/off of the loop circulating water pump (9) by detecting the comparison condition of the room actual temperature T ns and the room set temperature T ́ ns, when the air conditioner room actual temperature T ns is less than or equal to the room set temperature T ́ ns -2 ℃, the loop circulating water pump (9) stops operating, when the air conditioner room actual temperature T ns is greater than the room set temperature T ́ ns, the loop circulating water pump (9) starts operating, when the air conditioner room actual temperature T ns is greater than or equal to the room set temperature T ́ ns +2 ℃ during the heating operation in winter of the system, the loop circulating water pump (9) stops operating, and when the air conditioner room actual temperature T ns is less than the room set temperature T ́ ns, the loop circulating water pump (9) starts operating.
4. A control method of an energy-saving radiant cooling heating heat pump system according to claim 2 or 3, characterized by: the switching temperature T qh is 37 ℃.
5. A control method of an energy-saving radiant cooling and heating heat pump system according to claim 3, wherein the main circulating water pump (7) is always in an operating state regardless of whether the compressor (1) is on or off during the operation of the radiant cooling and heating heat pump system.
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| CN112524716A (en) * | 2020-10-21 | 2021-03-19 | 江苏嘉禾冷暖机电设备有限公司 | Three constant systems using energy-saving control strategy during starting |
| CN116221862B (en) * | 2022-12-02 | 2025-10-28 | 北京环都拓普空调有限公司 | A heat exchange device for temporary buildings |
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| CN202692535U (en) * | 2011-12-27 | 2013-01-23 | 北京清华索兰环能技术研究所 | Novel air source floor radiant heating and wind disk refrigerating system |
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