CN107024032B - Heat and cold supply system - Google Patents
Heat and cold supply system Download PDFInfo
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- CN107024032B CN107024032B CN201710445727.4A CN201710445727A CN107024032B CN 107024032 B CN107024032 B CN 107024032B CN 201710445727 A CN201710445727 A CN 201710445727A CN 107024032 B CN107024032 B CN 107024032B
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- 238000010438 heat treatment Methods 0.000 claims abstract description 54
- 238000001816 cooling Methods 0.000 claims abstract description 32
- 230000005855 radiation Effects 0.000 claims abstract description 23
- 238000004378 air conditioning Methods 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 287
- 238000005338 heat storage Methods 0.000 claims description 19
- 238000005265 energy consumption Methods 0.000 abstract description 8
- 238000005057 refrigeration Methods 0.000 description 11
- 238000005485 electric heating Methods 0.000 description 9
- 230000005611 electricity Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 230000001502 supplementing effect Effects 0.000 description 9
- 230000001105 regulatory effect Effects 0.000 description 7
- 239000002689 soil Substances 0.000 description 6
- 239000011521 glass Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011552 falling film Substances 0.000 description 1
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical group [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000013486 operation strategy Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B27/00—Machines, plants or systems, using particular sources of energy
- F25B27/002—Machines, plants or systems, using particular sources of energy using solar energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Other Air-Conditioning Systems (AREA)
- Steam Or Hot-Water Central Heating Systems (AREA)
Abstract
The heat and cold supply system comprises a solar heat pump system, a ground source heat pump system and an independent temperature and humidity control air conditioning system, wherein the independent temperature and humidity control air conditioning system comprises a ground radiation cooling and heating system, the solar heat pump system is connected with the ground source heat pump system, and the ground source heat pump system is connected with the ground radiation cooling and heating system. The solar heat pump system is coupled with the ground source heat pump system, and the temperature and humidity independent control air conditioning system at the tail end can provide various operation conditions so as to meet the annual temperature control requirement; and various operation conditions can adapt to different operation environments and operation requirements, so that the energy consumption is reduced to the maximum extent, and the economy and the reliability of the system are improved.
Description
Technical Field
The invention relates to the technical field of indoor functions, in particular to a heat and cold supply system.
Background
In recent years, with the great popularization and wide use of renewable energy technology in the building field, indoor heating and cooling have been gradually realized by renewable resources such as solar energy, ground source heat and the like. The technology of adopting solar energy and ground source thermal coupling heating and refrigerating is also gradually developed, as China patent publication No. CN 103512275A proposes a heat accumulating type solar ground source heat pump system, solar energy is stored in a solar water storage tank in a heat energy form, so that the annual living hot water supply and heating are satisfied, and compared with the traditional solar heat pump air conditioning system, the system heating does not need electricity to heat the hot water; when working conditions are in summer, the temperature conversion water storage tank in the system replaces refrigeration equipment such as a cooling tower or a lithium bromide unit, high-efficiency heat exchange is realized by adopting a spraying device through 'falling film method heat exchange', the refrigeration requirement and domestic hot water supply are met, the water supplementing device controlled by the float valve is adopted, water can be automatically supplemented, the water supplementing device is cooperated with a thermometer and an electromagnetic valve, water can be automatically changed according to the water temperature in the water tank, and the system is ensured to be in an optimal refrigeration state; when working conditions are in winter, a part of hot water in the solar water storage tank is used as domestic hot water, the other part of hot water is used as a heating source side, the temperature conversion water storage tank is used as a heat exchange place, and the temperature sensor arranged at the bottom of the water storage tank can ensure that the system is always in an optimal heat exchange state, namely, the optimal heating state is kept, and the heat exchange coil in the water storage tank adopts the arc spiral spindle-shaped arrangement with small diameters at two ends and large middle diameters, so that the energy of the hot water can be fully utilized.
However, the system needs to be provided with terminal equipment such as a spraying device and the like to realize temperature and humidity control, and the cost is high. In addition, at present, a heat supply and cooling system is usually arranged in a room, and if the solar energy and the ground source heat pump system can be combined to the independent temperature and humidity control system, the heat supply and cooling system has important significance for energy-saving indoor heat supply and cooling.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the heat and cold supply system with solar energy and the ground source heat pump coupled is provided, and the temperature control with energy conservation, environmental protection and economic benefit optimization is realized.
In order to solve the technical problems, the invention adopts the following technical scheme:
the heat and cold supply system comprises a solar heat pump system, a ground source heat pump system and an independent temperature and humidity control air conditioning system, wherein the independent temperature and humidity control air conditioning system comprises a ground radiation cooling and heating system, the solar heat pump system is connected with the ground source heat pump system, and the ground source heat pump system is connected with the ground radiation cooling and heating system.
The invention has the beneficial effects that: the solar heat pump system is coupled with the ground source heat pump system, and the temperature and humidity independent control air conditioning system at the tail end is added, so that various operation conditions can be provided on the premise of meeting the dynamic load requirement of the tail end, and the annual temperature control requirement can be met; and various operation conditions can adapt to different operation environments and operation requirements, so that the energy consumption is reduced to the maximum extent, and the economy and the reliability of the system are improved.
Drawings
Fig. 1 is a schematic diagram of a structural connection of a solar heat pump system and a ground source heat pump system of a heat and cold supply system according to a first embodiment of the present invention.
Description of the reference numerals:
1. a solar hot water heat exchanger; 2. a ground source side circulating water pump; 3. a trough solar collector; 4. a solar heat pump host; 5. a shell and tube heat exchanger; 61. a hot water circulation pump; 62. a domestic hot water secondary circulation pump; 7. a heat storage water tank; 8. solar heat-supplementing circulating pump; 9. an oil-gas separator; 10. a heat transfer oil circulation pump; 11. an expansion tank; 12. an oil injection pump; 13. an electric heating device; 14. a ground source heat pump unit; 141. an evaporator; 142. a condenser; 15. a load side circulating water pump; 16. a user-side water collector; 17. a user-side water separator; 18. a ground source side water separator; 19. a ground source side water collector; 20. a heat exchanger.
Detailed Description
In order to describe the technical contents, the achieved objects and effects of the present invention in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
The most critical concept of the invention is as follows: the solar heat pump system, the ground source heat pump system and the temperature and humidity independent control air conditioning system are combined to realize energy-saving temperature control.
Referring to fig. 1, the present invention provides:
the heat and cold supply system comprises a solar heat pump system, a ground source heat pump system and an independent temperature and humidity control air conditioning system, wherein the independent temperature and humidity control air conditioning system comprises a ground radiation cooling and heating system, the solar heat pump system is connected with the ground source heat pump system, and the ground source heat pump system is connected with the ground radiation cooling and heating system.
From the above description, the beneficial effects of the invention are as follows: the solar heat pump system is coupled with the ground source heat pump system, so that triple requirements of cold supply, heat supply and domestic water supply can be realized, and the air conditioning system with the tail end for independently controlling the temperature and the humidity for bearing sensible heat cold load can be realized, so that flexible conversion of various working conditions can be realized. In the actual use process, a proper operation strategy can be formulated by combining a passive building heat storage technology and peak-valley electricity price so as to further realize the energy-saving effect.
Further, the solar heat pump system comprises a solar hot water heat exchanger 1, the ground source heat pump system comprises a ground source side circulating water pump 2, and the solar hot water heat exchanger 1 is connected with the ground source side circulating water pump 2.
As is apparent from the above description, the coupling of the solar heat pump system and the ground source heat pump system is achieved by the connection of the solar hot water heat exchanger and the ground source heat pump unit.
Further, the solar heat pump system further includes: the solar heat pump comprises a groove type solar heat collector 3, a solar heat pump host 4, a shell and tube type heat exchanger 5, a hot water circulating pump 61, a heat storage water tank 7, a solar heat supplementing circulating pump 8, an oil-gas separator 9 and a heat conducting oil circulating pump 10, wherein the groove type solar heat collector 3, the heat conducting oil circulating pump 10, the oil-gas separator 9, the shell and tube type heat exchanger 5, the heat storage water tank 7, the solar heat supplementing circulating pump 8 and the solar hot water heat exchanger 1 are sequentially connected, and the groove type solar heat collector 3, the solar heat pump host 4, the hot water circulating pump 61 and the heat storage water tank 7 are sequentially connected, and the shell and tube type heat exchanger 5 is connected with the solar heat pump host 4.
As can be seen from the above description, the trough type solar collector absorbs solar energy to heat conduction oil injected into the trough type solar collector, and when the temperature of the conduction oil is higher than a certain value, the solar heat pump host absorbs low-grade heat energy in air to prepare hot water, so that the heat of the hot water mainly comes from solar radiant heat and outdoor air heat energy, and the heating efficiency is high.
Further, the solar heat pump system further comprises an expansion tank 11 and an oiling pump 12, and the oiling pump 12, the expansion tank 11 and the oil-gas separator 9 are sequentially connected.
From the above description, the heat transfer oil is introduced through the oil injection pump, separated by the expansion tank and the oil-gas separator, and then sent into the tank type solar heat collector.
Further, an electric heating device 13 is further included, and the electric heating device 13 is connected between the trough type solar collector 3 and the solar heat pump unit.
As is apparent from the above description, the auxiliary heating is performed by the electric heating apparatus, and the heating can be ensured to be normal even when the solar energy is insufficient.
Further, the ground source heat pump system further comprises a ground source side heat pump unit 14, a load side water circulating pump 15, a user side water collector 16, a user side water separator 17, a ground source side water circulating pump 2, a ground source side water separator 18 and a ground source side water collector 19, wherein the user side water collector 16, the load side water circulating pump 15, the ground source heat pump unit 14 and the user side water separator 17 are sequentially connected, and the ground source side water separator 19, the ground source heat pump unit 14, the ground source side water circulating pump 2 and the ground source side water separator 18 are sequentially connected.
From the above description, it can be seen that the user side water collector, the load side water circulating pump, the ground source heat pump unit, the user side water separator and the terminal ground radiation cooling and heating system form one heat exchange circulation system, the ground source heat pump unit, the ground source side water circulating pump, the ground source side water separator, the ground source side water collector and the ground source heat exchange well group form another heat exchange circulation system, and different operation conditions are realized through the mutual cooperation of the two heat exchange circulation systems.
Further, the ground source heat pump unit 14 includes an evaporator 141, a condenser 142, a first valve and a second valve, one end of the evaporator 141 is connected to the load side circulating water pump 15 and the ground source side circulating water pump 2, the other end of the evaporator 141 is connected to the user side water separator 17 and the ground source side water separator 18, one end of the condenser 142 is connected to the load side circulating water pump 15 and the ground source side circulating water pump 2, the other end of the condenser 142 is connected to the user side water separator 17 and the ground source side water separator 18, the first valve is provided between the evaporator 141 and the load side circulating water pump 15, the evaporator 141 and the user side water separator 17, the condenser 142 and the ground source side circulating water pump 2, and the condenser 142 and the ground source side water separator 18, and the second valve is provided between the condenser 142 and the load side circulating water pump 15, the condenser 142 and the user side water separator 17, the evaporator 141 and the ground source side circulating water pump 2, and the ground source water separator 18, respectively.
From the above description, the first valve and the second valve are controlled to realize flexible conversion of different working conditions such as refrigeration, heating and the like.
Further, the number of the ground source heat pump units 14 is more than two, and the more than two ground source heat pump units 14 are connected in parallel.
From the above description, the number of the ground source heat pump units can be selected according to actual needs.
Further, the system further comprises a third valve, a fourth valve and a heat exchanger 20, wherein the heat exchanger 20 is respectively connected with the load side circulating water pump 15, the user side water separator 17, the ground source side circulating water pump 2 and the ground source side water separator 18, the third valve is respectively arranged between the heat exchanger 20 and the load side circulating water pump 15, the third valve is respectively arranged between the heat exchanger 20 and the ground source side circulating water pump 2, and the fourth valve is respectively arranged between the heat exchanger 20 and the user side water separator 17 and between the heat exchanger 20 and the ground source side water separator 18.
From the above description, by arranging the heat exchanger, another heat exchange circulation system is realized, on the basis of original energy consumption, most of energy sources are saved, and the environment requirements required by heat users are realized by using a small amount of energy sources, so that the system achieves the energy-saving effect. Especially in the transition season and the summer part period, the ground source heat pump unit is not required to be started, and the heat exchanger directly exchanges heat with the ground source side, so that free cooling is realized.
Further, the solar water heater further comprises a fifth valve and a sixth valve, wherein the fifth valve is arranged between the solar water heater 1 and the ground source side water separator 18, and the sixth valve is arranged between the solar water heater 1 and the ground source side circulating water pump 2.
As can be seen from the above description, the solar heat pump system, the ground source heat pump system and the heat exchanger are cooperatively operated by controlling the first valve, the second valve, the third valve, the fourth valve, the fifth valve and the sixth valve, so that the energy consumption can be maximally reduced under the condition of meeting the use requirement.
The following is a specific embodiment of the present invention, and prior to describing the embodiment, a brief description of a trough solar collector will be given below:
the solar trough collector consists of parabolic trough light gathering reflector, vacuum glass tube, receiver (i.e. collector tube), sun tracking system and auxiliary device. Specifically, the heat of the vacuum glass tube is the direct solar radiation and reflection heat, and the heat loss is air convection heat exchange and sky radiation heat exchange; the heat of the heat collecting tube is solar radiation heat projected by the vacuum glass tube, the heat loss is the radiation heat exchange of the tube wall surface of the heat collecting tube and the vacuum glass tube and the convection heat exchange of the heat conduction oil, and the heat of the heat conduction oil is from the convection heat exchange of the metal glass tube.
Referring to fig. 1, a first embodiment of the present invention is as follows:
the heat supply and cooling system comprises a solar heat pump system, a ground source heat pump system, a temperature and humidity independent control air conditioning system, a heat exchanger 20, a first valve, a second valve, a third valve, a fourth valve, a fifth valve and a sixth valve, wherein the temperature and humidity independent control air conditioning system comprises a ground radiation cooling and heating system for bearing sensible heat cooling load and a fresh air system for bearing indoor wet load and fresh air cooling load, and the temperature and humidity independent control air conditioning system is any existing air conditioning system or air conditioner capable of realizing independent temperature and humidity control. The ground source heat pump system is connected with the ground radiation cooling and heating system. The ground radiation cooling and heating system specifically comprises, but is not limited to, a concrete filled ground radiation cooling and heating system, and is used for treating indoor sensible heat cooling load and winter heating heat load.
The ground source heat pump system includes: the ground source heat pump unit 14, the load side circulating water pump 15, the user side water collector 16, the user side water separator 17, the ground source side circulating water pump 2, the ground source side water separator 18 and the ground source side water collector 19, the ground source heat pump unit 14 comprises an evaporator 141 and a condenser 142, the number of the ground source heat pump units 14 is two, and the two ground source heat pump units 14 are connected in parallel.
One end of the evaporator 141 is connected with the load side circulating water pump 15 and the ground source side circulating water pump 2, the other end of the evaporator 141 is connected with the user side water separator 17 and the ground source side water separator 18, one end of the condenser 142 is connected with the load side circulating water pump 15 and the ground source side circulating water pump 2, the other end of the condenser 142 is connected with the user side water separator 17 and the ground source side water separator 18, first valves are respectively arranged between the evaporator 141 and the load side circulating water pump 15, between the evaporator 141 and the user side water separator 17, between the condenser 142 and the ground source side circulating water pump 2 and between the condenser 142 and the ground source side water separator 18, and second valves are respectively arranged between the condenser 142 and the load side circulating water pump 15, between the condenser 142 and the user side water separator 17, between the evaporator 141 and the ground source side circulating water pump 2 and between the evaporator 141 and the ground source side water separator 18. The ground source side water separator 18 and the ground source side water collector 19 are connected to the underground well group, respectively, and the user side water collector 16 and the user side water separator 17 are connected to the terminal air conditioning system, respectively.
The solar heat pump system includes: the solar heat collector 3, the solar heat pump host 4, the shell and tube heat exchanger 5, the hot water circulating pump 61, the heat storage water tank 7, the solar heat supplementing circulating pump 8, the oil-gas separator 9 of the solar hot water heat exchanger 1, the heat conducting oil circulating pump 10, the expansion tank 11, the oiling pump 12 and the electric heating device 13, wherein the solar heat collector 3, the heat conducting oil circulating pump 10, the oil-gas separator 9, the shell and tube heat exchanger 5, the heat storage water tank 7, the solar heat supplementing circulating pump 8 and the solar hot water heat exchanger 1 are sequentially connected, the solar heat collector 3, the solar heat pump host 4, the hot water circulating pump 61 and the heat storage water tank 7 are sequentially connected, the shell and tube heat exchanger 5 is connected with the solar heat pump host 4, the oiling pump 12, the expansion tank 11 and the oil-gas separator 9 are sequentially connected, the electric heating device 13 is connected between the solar heat collector 3 and the solar heat pump unit, the hot water circulating pump 61 is a primary circulating pump, and a secondary circulating pump 62 for domestic hot water connected with the water tank 7 can be further arranged. The heat storage water tank 7 is connected with one side of the solar water heater 1, the other side of the solar water heater 1 is respectively connected with the ground source heat pump unit 14 and the ground source side circulating water pump 2, a fifth valve is arranged between the solar water heater 1 and the ground source side water separator 18, and a sixth valve is arranged between the solar water heater 1 and the ground source side circulating water pump 2.
The heat exchanger 20 is connected to the load side circulating water pump 15, the user side water separator 17, the ground source side circulating water pump 2, and the ground source side water separator 18, and third valves are respectively provided between the heat exchanger 20 and the load side circulating water pump 15, between the heat exchanger 20 and the ground source side circulating water pump 2, and fourth valves are respectively provided between the heat exchanger 20 and the user side water separator 17, and between the heat exchanger 20 and the ground source side water separator 18. The schematic structural connection diagram of the coupling of the solar heat pump system and the ground source heat pump system in this embodiment is shown in fig. 1.
The connection between the above devices is realized by a pipeline.
The following describes the operation conditions of the heating and cooling system:
(1) Standard refrigeration condition
The first valve a is opened, the second valve b, the third valve c, the fourth valve d, the fifth valve e and the sixth valve f are closed, and the heat source heat pump unit, the load side circulating pump and the ground source side circulating pump operate.
Principle of refrigeration: and heat generated in the room is circularly transferred to the soil side through the load side and the ground source side under the refrigeration working condition by the ground source heat pump unit. The method comprises the following steps:
load side: the return water at 21 ℃ of the sensible heat cold load end of the air conditioner is collected to a user side water collector, is pumped to an evaporator of a ground source heat pump unit by a return water main pipe, exchanges heat with a refrigerant to prepare high-temperature chilled water at 17 ℃, and is sent to the air conditioner end by a water main pipe through a user side water separator for heat exchange. An analog electric regulating valve is arranged between an air conditioner water supply main pipe and a backwater main pipe, the outlet water temperature of the evaporator side of the heat pump unit is tested, when the outlet water temperature is less than 17 ℃, the opening of the electric regulating valve is regulated, part of air conditioner backwater is mixed with the outlet water of the heat pump unit, the air conditioner water supply temperature is ensured to be constant (namely 17 ℃, the facility water supply temperature is 17 ℃, the indoor sensible heat cold load is borne by a floor radiation cooling system, and in order to avoid the phenomenon that the ground surface temperature is lower than the ground dew phenomenon caused by the indoor air dew point temperature due to the excessively low water supply temperature).
Ground source side: heat brought by the tail end of the air conditioner is transferred to the side of the condenser through the ground source heat pump unit, and is dispersed to all the buried pipe well groups by the ground source circulating water pump through the ground source water separator for heat exchange. And after the temperature is reduced, the cooling water is conveyed to the condenser side of the ground source side pump unit through the ground source side water collector to exchange heat again.
During the refrigerating period, the ground source heat pump unit is started, and automatic number adding and subtracting machines and load adding and subtracting loads are carried out according to the sensible heat and cold load demands of the tail end. The number of the circulating water pumps on the ground source side and the load side is in one-to-one correspondence with the ground source heat pump units.
The system has larger electric energy consumption under the working condition than other working conditions, and is suitable for providing cold in extreme weather in summer.
(2) Standard heating working condition
The second valve b is opened, the first valve a, the third valve c, the fourth valve d, the fifth valve e and the sixth valve f are closed, and the heat source heat pump unit, the load side circulating pump and the ground source side circulating pump operate.
Heating principle: and under the heating working condition of the ground source heat pump unit, the indoor heat required by the room transfers the soil side heat to the room through the load side and ground source side circulation. The method comprises the following steps:
load side: the water returned at 35 ℃ at the tail end of the heating heat load is collected to a user side water collector, is pumped to a condenser of a ground source heat pump unit through a water return main pipe by a load side circulating water pump, exchanges heat with a refrigerant to prepare low-temperature heating hot water at 45 ℃, and is sent to an indoor floor radiation heating tail end through a user side water separator by a water supply main pipe to exchange heat. During the heating operation, an analog electric regulating valve is arranged between the water supply main pipe and the backwater main pipe and is in a closed state.
Ground source side: the low-temperature heat brought by the underground well groups and the soil exchanges heat and then is collected to an underground source side water collector through each underground well group, the low-temperature heat is conveyed to the evaporator side of an underground source heat pump unit by an underground source side circulating pump, and the low-temperature cold water after unit heat exchange is dispersed to each underground well group through an underground source side water separator to perform a secondary heat exchange process. The load side heating load is completed by three parts of the ground source side buried well group heat absorption capacity, the ground source side circulating water pump shaft power and the ground source heat pump unit shaft power.
During heating, the ground source heat pump unit starts the number of units, and automatic number adding and subtracting machines and load adding and subtracting loads are carried out according to the end heat load demand. The number of the circulating water pumps on the ground source side and the load side is in one-to-one correspondence with the ground source heat pump units.
Under the working condition, during the heating period, the indoor heat load is completely borne by the system. If the peak-valley electricity price difference exists at the operation place, the heat pump system is started by utilizing the night low-valley electricity price period and the local flat electricity price period, and the heat is stored and built in the structural floor slab by utilizing the passive building energy storage technology, so that the heat pump system is not started in the daytime peak electricity price and most of the flat electricity price period, and the energy consumption and the expense can be greatly reduced.
(3) Free refrigeration under partial refrigeration working conditions in transitional seasons and summer
The third valve c and the fourth valve d are opened, the first valve a, the second valve b, the fifth valve e and the sixth valve f are closed, and the load side circulation pump, the ground source side circulation pump and the heat exchanger are operated.
Principle of refrigeration: under the indoor cold condition, the ground source heat pump unit does not need to be started, and heat generated in the room is transferred to the soil side through the heat exchanger. The method comprises the following steps:
load side: the return water at 21 ℃ at the tail end of the sensible heat cooling load of the air conditioner is collected to a user side water collector, is pumped to the secondary side of the free heat exchanger by the circulating water pump at the load side through a return water main pipe, exchanges heat with the high-temperature cold water at the ground source side to prepare the high-temperature chilled water at 17 ℃, and is sent to the ground radiation cooling system for heat exchange by the water main pipe through the user side water separator. An analog electric regulating valve is arranged between the air conditioner water supply main pipe and the backwater main pipe, the secondary side outlet water temperature of the heat exchanger is tested, when the outlet water temperature is less than 17 ℃, the opening of the electric regulating valve is regulated, part of air conditioner backwater is mixed with the outlet water of the heat pump unit, and the air conditioner water supply temperature is ensured to be constant (17 ℃).
Ground source side: the heat brought by the ground radiation cooling system is transferred to the primary side through the heat exchanger, and is dispersed to each buried pipe well group for heat exchange through the ground source side water separator by the ground source side circulating water pump. And after the temperature is reduced, the cooling water is conveyed to the primary side of the heat exchanger through the ground source side water collector, and heat exchange is carried out again.
During free refrigeration, the number of circulating water pumps on the ground source side and the load side is automatically increased or decreased according to the end sensible heat cooling load demand. The number of the circulating water pumps on the ground source side and the load side is in one-to-one correspondence.
Under the working condition, the system has lower electric energy consumption and large energy-saving space. Providing indoor cold energy in a transition season, wherein under the condition that the summer is lower than the design working condition, peak-valley electricity price difference exists at the operation place, and only a free cold supply system is started at night to store cold for a building by utilizing the night valley electricity price; during daytime, the free cooling system and the fresh air system alternately operate, so that energy conservation can be maximized.
(4) Non-heating season buried pipe well group heat balance
The fifth valve e and the sixth valve f are opened, the first valve, the second valve, the third valve and the fourth valve are closed, and the solar heat-supplementing circulating pump, the ground source side circulating pump, the solar heat pump host and the solar hot water heat exchanger operate.
The principle of heat compensation: after the ground source heat pump system operates in a complete cold supply season, the heat is obtained at the ground source side all the year round and is greater than the heat obtained at the ground source side, the heat produced by the solar heat pump system is stored in the underground well group, and the balance of the heat obtained at the ground source side and the heat obtained at the ground source side is recovered. The method comprises the following steps:
the heat generated by the operation of the solar heating system is stored in the heat storage water tank, the heat is conveyed to the primary side of the solar hot water heat exchanger by the solar heat supplementing circulating pump, the heat exchanged out is conveyed to each ground source well group by the secondary side of the solar hot water heat exchanger through the ground source water separator, the hot water is conveyed to the secondary side of the solar hot water heat exchanger again by the ground source circulating pump after heat exchange with the buried well group through the ground source water collector, one heat exchange cycle is completed, and the earth source side is continuously compensated for all the year round, so that the cold and hot balance is maintained.
The working condition is continuously and perfectly used, the annual operation reliability of the whole combined system is improved, the operation energy consumption of the heating working condition and the cooling working condition is reduced, and the operation efficiency of the system is improved.
(5) Non-standard heating operating conditions
The second valve b, the fifth valve e and the sixth valve f are opened, the first valve a, the third valve c and the fourth valve d are closed, and the heat source heat pump unit, the load side circulating pump, the ground source side circulating pump, the solar heat pump system and the solar heat supplementing circulating pump operate.
Heating principle:
under the heating working condition of the indoor heat required by the ground source heat pump unit, the heat of the soil side is transferred to the indoor through the circulation of the load side and the ground source side, and meanwhile, the solar heat pump system is utilized to produce heat to heat the soil temperature, so that the water inlet temperature of the evaporator side of the heat pump unit is improved, the efficiency of the ground source heat pump unit is improved, and the power consumption is reduced.
During heating operation, the standard heating working condition is assisted by utilizing the heat supplementing principle that the heat balance is carried out on the non-heating buried pipe (5) under the extreme operation working condition while the standard heating working condition principle is adopted, so that the water inlet temperature of the evaporator side of the heat pump unit is improved.
During heating, the ground source heat pump unit starts the number of units, and automatic number adding and subtracting machines and load adding and subtracting loads are carried out according to the end heat load demand. The number of the circulating water pumps on the ground source side and the load side is in one-to-one correspondence with the ground source heat pump units.
The working condition is used under the extreme condition of the heat supply working condition, when the water outlet temperature of the main pipe of the water collector at the local source side is less than or equal to 7 ℃, and the hot water outlet tank is used when hot water is not supplied to domestic hot water, the heating power consumption of the water source heat pump system can be reduced.
(6) Standard working condition of domestic hot water of solar heat pump system
The fifth valve e and the sixth valve f are closed, and the opening and closing of the first valve a, the second valve b, the third valve c and the fourth valve are determined according to the working condition of the ground source heat pump system. The hot water circulating pump, the solar heat pump host, the shell-and-tube heat exchanger, the groove type solar heat collector, the electric heating equipment and the heat storage water tank run;
heating principle: the groove type solar heat collector collects solar radiant heat, and heats conduction oil to drive the solar heat pump host machine to absorb low-grade heat in air so as to prepare hot water. The method comprises the following steps:
the heat conducting oil is heated, the heated oil temperature meets the starting operation temperature of the solar heat pump unit (under the general condition, the temperature of the heat conducting oil is more than or equal to 130 ℃, when the oil temperature is not met, the electric heating equipment is started to perform auxiliary heating), the heat conducting oil is conveyed to the solar heat pump host machine to drive the host machine to absorb low-grade heat in the air, the heat conducting oil is heated and operated, and after heat exchange and temperature reduction, the heat conducting oil enters the groove type solar heat collector again through the oil-gas separator and the heat conducting oil circulating pump to absorb solar radiation heat. The low-temperature hot water in the heat storage water tank is conveyed to the solar heat pump host through the life hot water circulating pump, the prepared hot water at 55 ℃ enters the heat storage water tank again through the secondary side loop of the shell and tube heat exchanger, and the hot water heating cycle is completed.
The working condition utilizes solar energy and air heat energy to prepare domestic hot water, and has great energy saving potential.
(7) Free heat supply working condition of solar heat pump domestic hot water
The fifth valve e and the sixth valve f are closed, and the first valve a, the second valve b, the third valve c and the fourth valve are opened and closed according to the working condition of the ground source heat pump system, and the hot water circulating pump, the shell and tube heat exchanger, the groove type solar heat collector, the electric heating equipment and the heat storage water tank operate.
Heating principle: the trough type solar heat collector collects solar radiant heat, and the domestic hot water is heated through heat exchange of the shell and tube type heat exchanger, so that the minimum hot water supply temperature requirement of the domestic hot water is met. The method comprises the following steps:
the heated heat conducting oil directly enters the primary side of the shell-and-tube heat exchanger through electric auxiliary heating equipment (opening under the extreme weather conditions such as continuous rain and snow, haze and the like), and after heat exchange and temperature reduction, the heat conducting oil enters the groove type solar heat collector again through the oil-gas separator and the heat conducting oil circulating pump to absorb solar radiation heat. After being conveyed to a solar heat pump host (not started) through a life hot water circulating pump, the low-temperature hot water in the heat storage water tank directly enters the secondary side of the shell-and-tube heat exchanger to absorb heat of heat conducting oil, and hot water at 55 ℃ is prepared to enter the heat storage water tank again, so that hot water heating circulation is completed.
When the outdoor solar illuminance is good, the domestic hot water demand is low, the water temperature requirement is not strict, and the minimum water supply temperature requirement is met, the working condition can be adopted for operation, and compared with the standard working condition of the domestic hot water of the solar heat pump system, the energy-saving potential is larger.
It should be noted that the specific temperature values mentioned above are merely examples, and may be flexibly adjusted in practical use.
In summary, the heat and cold supply system provided by the invention provides various operation conditions, is flexible to control and has good energy-saving effect.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent changes made by the specification and drawings of the present invention, or direct or indirect application in the relevant art, are included in the scope of the present invention.
Claims (4)
1. The heat and cold supply system is characterized by comprising a solar heat pump system, a ground source heat pump system and an independent temperature and humidity control air conditioning system, wherein the independent temperature and humidity control air conditioning system comprises a ground radiation cooling and heating system, the solar heat pump system is connected with the ground source heat pump system, and the ground source heat pump system is connected with the ground radiation cooling and heating system;
the solar heat pump system comprises a solar hot water heat exchanger, the ground source heat pump system comprises a ground source side circulating water pump, and the solar hot water heat exchanger is connected with the ground source side circulating water pump;
the solar heat pump system further includes: the solar heat pump comprises a trough type solar heat collector, a solar heat pump host, a shell and tube type heat exchanger, a hot water circulating pump, a heat storage water tank, a solar heat-supplementing circulating pump, an oil-gas separator and a heat conducting oil circulating pump, wherein the trough type solar heat collector, the heat conducting oil circulating pump, the oil-gas separator, the shell and tube type heat exchanger, the heat storage water tank, the solar heat-supplementing circulating pump and the solar hot water heat exchanger are sequentially connected, and the trough type solar heat collector, the solar heat pump host, the hot water circulating pump and the heat storage water tank are sequentially connected;
the solar heat pump unit is connected with the solar heat collector through the solar heat pump unit;
the ground source heat pump system further comprises a ground source side heat pump unit, a load side circulating water pump, a user side water collector, a user side water separator, a ground source side water separator and a ground source side water collector, wherein the user side water collector, the load side circulating water pump, the ground source heat pump unit and the user side water separator are sequentially connected, and the ground source side water collector, the ground source heat pump unit, the ground source side circulating water pump and the ground source side water separator are sequentially connected;
the number of the ground source heat pump units is more than two, and the more than two ground source heat pump units are connected in parallel;
the system comprises a load side circulating water pump, a user side water separator, a ground source side circulating water pump and a ground source side water separator, and is characterized by further comprising a third valve, a fourth valve and a heat exchanger, wherein the heat exchanger is respectively connected with the load side circulating water pump, the user side water separator, the ground source side circulating water pump and the ground source side water separator, the third valve is respectively arranged between the heat exchanger and the load side circulating water pump, the third valve is respectively arranged between the heat exchanger and the ground source side circulating water pump, and the fourth valve is respectively arranged between the heat exchanger and the user side water separator and the fourth valve is respectively arranged between the heat exchanger and the ground source side water separator.
2. A heat and cold supply system according to claim 1, wherein the solar heat pump system further comprises an expansion tank and an oil filling pump, and the oil filling pump, the expansion tank and the oil-gas separator are connected in sequence.
3. The heat and cold supply system according to claim 1, wherein the ground source heat pump unit comprises an evaporator condenser, a first valve and a second valve, one end of the evaporator is connected with the load side circulating water pump and the ground source side circulating water pump respectively, the other end of the evaporator is connected with the user side water separator and the ground source side water separator respectively, one end of the condenser is connected with the load side circulating water pump and the ground source side circulating water pump respectively, the other end of the condenser is connected with the user side water separator and the ground source side water separator respectively,
first valves are respectively arranged between the evaporator and the load side circulating water pump, between the evaporator and the user side water separator, between the condenser and the ground source side circulating water pump and between the condenser and the ground source side water separator, and second valves are respectively arranged between the condenser and the load side circulating water pump, between the condenser and the user side water separator, between the evaporator and the ground source side circulating water pump and between the evaporator and the ground source side water separator.
4. A heating and cooling system according to claim 1, further comprising a fifth valve and a sixth valve, wherein the fifth valve is arranged between the solar water heater and the ground source side water separator, and the sixth valve is arranged between the solar water heater and the ground source side circulating water pump.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107702355A (en) * | 2017-11-14 | 2018-02-16 | 优晖科技（北京）有限公司 | Butterfly solar energy system |
| CN108254207B (en) * | 2018-01-05 | 2024-05-28 | 深圳市英维克科技股份有限公司 | An air conditioning enthalpy difference performance laboratory |
| CN109664480B (en) * | 2019-01-15 | 2021-04-20 | 宁夏神州轮胎有限公司 | Tire semi-finished product low-temperature cooling circulation system |
| CN111322698B (en) * | 2019-12-30 | 2025-08-22 | 中机意园工程科技股份有限公司 | A multi-source heating and cooling system for computer rooms |
| CN116857863B (en) * | 2023-07-07 | 2024-03-19 | 淮北矿业(集团)有限责任公司物业分公司 | Multi-energy complementary system optimization control method and device based on large-scale ground source heat pump |
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