CN110595089B - Air conditioning system capable of recovering indoor residual cold and residual heat after shutdown - Google Patents

Air conditioning system capable of recovering indoor residual cold and residual heat after shutdown Download PDF

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Publication number
CN110595089B
CN110595089B CN201910801331.8A CN201910801331A CN110595089B CN 110595089 B CN110595089 B CN 110595089B CN 201910801331 A CN201910801331 A CN 201910801331A CN 110595089 B CN110595089 B CN 110595089B
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indoor
electronic expansion
expansion valve
heat exchanger
winter
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CN110595089A (en
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张春路
张靖
曹祥
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Tongji University
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Tongji University
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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
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • 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
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/24—Storage receiver heat
    • 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
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention relates to an air conditioning system capable of recovering indoor residual cold and waste heat after shutdown, which comprises a compressor (1), a four-way reversing valve (3), an outdoor heat exchanger (5), a first electronic expansion valve (8), an energy storage module (10), a second electronic expansion valve (12), a balance tank (14) and an indoor heat exchanger (16), wherein refrigerant channel inlets of the outdoor heat exchanger (5), the first electronic expansion valve (8), the energy storage module (10), the second electronic expansion valve (12), the balance tank (14) and refrigerant channel outlets of the indoor heat exchanger (16) are sequentially connected through connecting pipelines; the interface A of the four-way reversing valve (3) is connected with the outlet of a refrigerant channel of the indoor heat exchanger (16), the interface B, C is connected with the suction port and the exhaust port of the compressor (1), and the interface D is connected with the inlet of the refrigerant channel of the outdoor heat exchanger (5). Compared with the prior art, the invention has the advantages of energy saving, rapid temperature rise and drop, convenient modification and the like.

Description

Air conditioning system capable of recovering indoor residual cold and residual heat after shutdown
Technical Field
The invention relates to a steam compression type air conditioning system, in particular to an air conditioning system capable of recovering indoor residual cold and waste heat after shutdown.
Background
With the improvement of living standard of people, more and more families are provided with air conditioning systems to meet the requirements of summer refrigeration and winter heating.
In hot summer, the outdoor temperature can reach more than 35 ℃, and after the air conditioner is started, the indoor temperature can be reduced to a comfortable temperature area of about 27 ℃. When a person is ready to leave an air-conditioned room for a period of time, the air conditioner is typically turned off to conserve power. After the air conditioner is stopped, the temperature in the room gradually rises to be close to the outdoor temperature and the loss of cold energy due to the infiltration of outdoor high-temperature heat. When people return to the room and turn on the air conditioner again, after waiting for a long time (about 10 minutes), the indoor temperature is reduced to about 27 ℃. From the professional perspective, when people leave the air conditioning area and turn off the air conditioning system in the area, the indoor cold quantity is gradually dissipated to the outside due to heat leakage of the enclosure structure, and the indoor temperature is gradually increased and gradually approaches to the outdoor temperature; when people return to the air conditioning area and start the air conditioning system in the area again, the air conditioning system is required to bear not only the cold load but also the indoor heat removal amount because of the intermittent operation of the air conditioning system. The invention aims to automatically start a summer residual cold recovery mode when people leave a room and close an air conditioner, and can recover and store indoor cold energy into an energy storage module by using very little electric energy. When people return to a room, the stored cold energy can be discharged by starting a summer refrigeration mode, so that the energy is saved, the refrigeration capacity of the unit in the starting-up stage is improved, the indoor temperature can be rapidly reduced, and the thermal comfort of a human body is improved.
In cold winter, the outdoor temperature is lowered to below 0 ℃, and after the air conditioner is started, the indoor temperature can be raised to a comfortable temperature zone of about 20 ℃. When a person is ready to leave an air-conditioned room for a period of time, the air conditioner is typically turned off to conserve power. After the air conditioner is stopped, the indoor heat is lost to the outside, so that the indoor temperature is gradually reduced to be close to the outdoor temperature and the heat loss is caused. People return to the room, turn on the air conditioner again, and after waiting for a long time, the indoor temperature rises to about 20 ℃ again. From the professional perspective, when people leave the air conditioning area and turn off the air conditioning system in the area, the heat leakage of the enclosure structure gradually dissipates the indoor heat to the outside, and the indoor temperature gradually decreases and gradually approaches the outdoor temperature; when people return to the air conditioning area and start the air conditioning system in the area again, the air conditioning system is required to bear heat load and indoor cooling capacity because the air conditioning system runs intermittently. The invention aims to automatically start the winter waste heat recovery mode when people leave the room, utilize little electric energy to recover and store the indoor heat into the energy storage module, and start the winter heating mode to release the stored heat when people return to the room, thereby not only saving energy, but also improving the heating capacity of the unit at the starting-up stage, rapidly heating the room and improving the thermal comfort of human body. And after the energy storage module finishes energy release, switching to a winter conventional heating mode to continuously ensure the indoor temperature. When the air conditioner runs in winter, the outdoor heat exchanger still faces the problem of frosting and has the requirement of defrosting. The main defrosting means at present is to switch the running state of the unit and utilize the heat of the compressor to defrost, and the defrosting means has the defects of longer defrosting time, higher energy consumption and possibility of generating the problem of indoor cold air blowing due to the lack of a low-level heat source, thereby reducing the thermal comfort of the human body. The invention can start the defrosting mode in winter, utilizes the heat in the energy storage module to defrost the outdoor heat exchanger, not only can shorten the defrosting time and save energy consumption, but also can ensure small indoor temperature fluctuation during defrosting and improve the thermal comfort of human bodies.
Patent CN201610204566.5 proposes that facilities such as a cold storage cabinet and a circulating water path are added indoors to store indoor cold, but this device has a large size and a complex pipeline, and needs to make a great change on the original air conditioning system, and is not suitable for a small air conditioning system; patent ZL201510933975.4 proposes to add an energy storage module indoors to increase the supercooling degree of the refrigeration cycle, and increase the refrigeration capacity of the system under the condition of high load, so as to meet the refrigeration capacity requirements under different loads, but not recover the redundant refrigeration capacity or heat in the room; patent CN200510009975.1 and patent CN200810209519.5 propose respectively in the indoor heat exchanger side parallel energy storage module and in the dry filter and the indoor heat exchanger between the method of installing the energy storage module additional, realize the function of winter energy storage defrosting, and this patent establishes ties the energy storage module in the middle of outdoor heat exchanger and indoor heat exchanger, front and back are controlled with electronic expansion valve, can switch over between six modes, not only satisfy the demand of winter defrosting, more importantly can retrieve the residual cold or the waste heat after the indoor shut down, and improved the unit refrigeration or the heating capacity at the start-up stage, accelerated the speed of air conditioner room cooling or intensification, improve indoor heat comfort condition.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an air conditioning system capable of recovering residual cold and residual heat in a room after shutdown.
The purpose of the invention can be realized by the following technical scheme:
an air conditioning system capable of recovering residual indoor cold and waste heat after shutdown comprises a compressor, a four-way reversing valve, an outdoor heat exchanger, a first electronic expansion valve, an energy storage module, a second electronic expansion valve, a balance tank and an indoor heat exchanger, wherein the outdoor heat exchanger and the indoor heat exchanger comprise a refrigerant channel and an air channel, and a refrigerant channel inlet of the outdoor heat exchanger, the first electronic expansion valve, the energy storage module, the second electronic expansion valve, the balance tank and a refrigerant channel outlet of the indoor heat exchanger are sequentially connected through pipelines;
the interface A of the four-way reversing valve is connected with the outlet of a refrigerant channel of the indoor heat exchanger, the interface B is connected with the air suction port of the compressor, the interface C is connected with the air exhaust port of the compressor, and the interface D is connected with the inlet of the refrigerant channel of the outdoor heat exchanger.
An outdoor fan is correspondingly arranged in the air channel of the outdoor heat exchanger; an indoor fan is correspondingly arranged in the air channel of the indoor heat exchanger.
The working modes of the air conditioning system comprise a summer refrigeration mode, a summer residual cold recovery mode, a winter starting heating mode, a winter conventional heating mode, a winter residual heat recovery mode and a winter defrosting mode.
The interfaces A, B and C, D of the four-way reversing valve are communicated under the modes of summer refrigeration, winter waste heat recovery and winter defrosting, and the interfaces A, C and B, D of the four-way reversing valve are communicated under the modes of summer waste heat recovery, winter starting heating and winter conventional heating.
In the summer refrigeration mode, both the outdoor fan and the indoor fan are opened, and the first electronic expansion valve is fully opened; and in the summer residual cold recovery mode, the outdoor fan is closed, the indoor fan is opened, and the first electronic expansion valve is fully opened.
In the winter starting heating mode, the outdoor fan is started, the indoor fan is started, and the first electronic expansion valve is fully opened; in the winter conventional heating mode, the outdoor fan is started, the indoor fan is started, and the second electronic expansion valve is fully opened; in the winter waste heat recovery mode, the outdoor fan is closed, the indoor fan is opened, and the first electronic expansion valve is fully opened; and in the defrosting mode in winter, the outdoor fan is started, the indoor fan is closed, and the second electronic expansion valve is fully opened.
The first electronic expansion valve is a high-temperature electronic expansion valve.
The energy storage module is internally provided with a reaction bed filled with energy storage materials, and the outside of the energy storage module is provided with a heat insulation material.
The energy storage material does not enter the refrigerant cycle.
The energy storage material and the refrigerant are subjected to heat exchange, when the refrigerant and the energy storage material do not undergo chemical reaction or are mutually soluble, the refrigerant can be in direct contact with the energy storage material for heat exchange, and otherwise, a partition wall is arranged to prevent the refrigerant and the energy storage material from contacting.
The energy storage material comprises a liquid energy storage material, a solid energy storage material, a gas energy storage material and a phase change material or a thermochemical reaction material.
Preferably, the energy storage material can be selected from phase change materials with phase change temperature of 10-20 ℃ and high solution heat, including hexadecane C16H34And potassium fluoride KF.4H tetrahydrate2O。
Compared with the prior art, the invention has the following beneficial effects:
1. the invention fully utilizes the residual cold and the residual heat in the room after the air conditioner is stopped, and the energy storage module is used for the next air conditioner starting, thereby avoiding the energy loss to a great extent.
2. The stored cold or heat is released through the energy storage module in the starting stage, so that the refrigerating capacity or the heating capacity of the unit can be enhanced, and the indoor temperature can be rapidly reduced or increased.
3. The invention can utilize the heat in the energy storage module to defrost the outdoor heat exchanger in winter, compared with the prior art, the defrosting speed is obviously improved, and the defrosting effect is improved.
4. Compared with the traditional energy storage technology, the energy storage module only needs to meet the capacity of recovering the residual cold and the residual heat in the room, and has the advantages of small volume, flexible arrangement, small influence on a refrigerating system and convenient modification.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view showing a cooling mode in summer according to the present invention;
FIG. 3 is a schematic structural diagram of a summer residual cooling recovery mode according to the present invention;
FIG. 4 is a schematic view of the winter start heating mode according to the present invention;
FIG. 5 is a schematic structural view illustrating a conventional winter heating mode according to the present invention;
FIG. 6 is a schematic diagram of the winter waste heat recovery mode according to the present invention;
fig. 7 is a schematic structural view of a defrosting mode in winter according to the present invention.
Reference numerals:
1-a compressor; a 3-four-way reversing valve; 5-outdoor heat exchanger; 6-indoor fan; 8-a first electronic expansion valve; 10-an energy storage module; 12-a second electronic expansion valve; 14-a balancing tank; 16-indoor heat exchanger; 17-an outdoor fan; 2. 4, 7, 9, 11, 13, 15, 18, 19-connecting pipelines.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1, an air conditioning system capable of recovering residual heat and waste heat in a room after shutdown comprises a compressor 1, a four-way reversing valve 3, an outdoor heat exchanger 5, a first electronic expansion valve 8, an energy storage module 10, a second electronic expansion valve 12, a balancing tank 14 and an indoor heat exchanger 16, wherein the outdoor heat exchanger 5 and the indoor heat exchanger 16 comprise a refrigerant channel and an air channel, and the refrigerant channel inlet of the outdoor heat exchanger 5, the refrigerant channel outlet of the first electronic expansion valve 8, the energy storage module 10, the second electronic expansion valve 12, the balancing tank 14 and the indoor heat exchanger 16 are sequentially connected through a connecting pipeline;
the interface A of the four-way reversing valve 3 is connected with the outlet of a refrigerant channel of the indoor heat exchanger 16, the interface B is connected with the suction port of the compressor 1, the interface C is connected with the exhaust port of the compressor 1, and the interface D is connected with the inlet of the refrigerant channel of the outdoor heat exchanger 5.
An outdoor fan 6 is correspondingly arranged in an air channel of the outdoor heat exchanger 5; an indoor fan 17 is correspondingly arranged in the air channel of the indoor heat exchanger 16.
The working modes of the air conditioning system comprise a summer refrigeration mode, a summer residual cold recovery mode, a winter starting heating mode, a winter conventional heating mode, a winter residual heat recovery mode and a winter defrosting mode.
The interfaces A, B of the four-way reversing valve 3 are communicated under the modes of summer refrigeration, winter waste heat recovery and winter defrosting, the interfaces C, D are communicated, the interfaces A, C of the four-way reversing valve 3 are communicated under the modes of summer waste heat recovery, winter starting heating and winter conventional heating, and the interfaces B, D are communicated.
In the summer refrigeration mode, the outdoor fan 6 and the indoor fan 17 are both opened, and the first electronic expansion valve 8 is fully opened; in the summer residual cold recovery mode, the outdoor fan 6 is closed, the indoor fan 17 is opened, and the first electronic expansion valve 8 is fully opened.
In the winter starting heating mode, the outdoor fan 6 is started, the indoor fan 17 is started, and the first electronic expansion valve 8 is fully opened; in the winter conventional heating mode, the outdoor fan 6 is started, the indoor fan 17 is started, and the second electronic expansion valve 12 is fully opened; in the winter waste heat recovery mode, the outdoor fan 6 is closed, the indoor fan 17 is opened, and the first electronic expansion valve 8 is fully opened; in the defrosting mode in winter, the outdoor fan 6 is turned on, the indoor fan 17 is turned off, and the second electronic expansion valve 12 is fully opened.
The first electronic expansion valve 8 is a high-temperature electronic expansion valve.
The energy storage module 10 has a reaction bed filled with energy storage material and a heat insulating material outside.
The energy storage material does not enter the refrigerant cycle.
The energy storage material and the refrigerant exchange heat, when the refrigerant and the energy storage material do not react chemically or are mutually soluble, the refrigerant can directly contact with the energy storage material for heat exchange, otherwise, a partition wall is arranged to prevent the refrigerant from contacting.
The energy storage material comprises a liquid energy storage material, a solid energy storage material, a gas energy storage material and a phase change material or a thermochemical reaction material.
Preferably, the energy storage material can be selected from phase change materials with phase change temperature of 10-20 ℃ and high solution heat, including hexadecane C16H34And potassium fluoride KF.4H tetrahydrate2O。
In the summer refrigeration mode, as shown in fig. 2, the ports a and B of the four-way reversing valve 3 are communicated, the ports C and D are communicated, the outdoor fan 6 and the indoor fan 17 are both opened, and the first electronic expansion valve 8 is fully opened, which is equivalent to a connecting pipe. The refrigerant is compressed in the compressor 1 to become high-temperature and high-pressure gas, is introduced into the outdoor heat exchanger 5 through the connecting pipe 2, the four-way reversing valve 3 and the connecting pipe 4 to be condensed and released, and then enters the energy storage module 10 through the connecting pipe 7, the first electronic expansion valve 8 and the connecting pipe 9 in sequence to be supercooled, and at the moment, the energy storage module releases the stored cold energy. The supercooled refrigerant enters a second electronic expansion valve 12 through a connecting pipe 11 for throttling, enters an indoor heat exchanger 16 through a connecting pipe 13, a balancing tank 14 and a connecting pipe 15 for evaporation and heat absorption after throttling, and returns to the compressor 1 through a connecting pipe 18, a four-way reversing valve 3 and a connecting pipe 19 in sequence to complete circulation.
The summer residual cold recovery mode is as shown in fig. 3, the interfaces a and C of the four-way reversing valve 3 are communicated, the interfaces B and D are communicated, the outdoor fan 6 is closed, the indoor fan 17 is opened, and the first electronic expansion valve 8 is fully opened, which is equivalent to a connecting pipe. The refrigerant is changed into high-temperature and high-pressure gas through the compression action in the compressor 1, the high-temperature and high-pressure gas is introduced into the indoor heat exchanger 16 through the connecting pipe 2, the four-way reversing valve 3 and the connecting pipe 18 to be condensed and released, then enters the energy storage module 10 to evaporate and absorb heat through the connecting pipe 15, the balancing tank 14 (part of the refrigerant is stored in the balancing tank), the connecting pipe 13, the second electronic expansion valve 12 and the connecting pipe 11 in sequence, the energy storage material is cooled, the energy storage module stores cold, the refrigerant returns to the compressor 1 through the connecting pipe 9, the first electronic expansion valve 8, the connecting pipe 7, the outdoor heat exchanger 5, the.
In the winter starting heating mode, as shown in fig. 4, the ports a and C of the four-way reversing valve 3 are communicated, the ports B and D are communicated, the outdoor fan 6 is turned on, the indoor fan 17 is turned on, and the first electronic expansion valve 8 is fully opened, which is equivalent to a connecting pipe. The refrigerant is compressed in the compressor 1 to become high-temperature and high-pressure gas, the gas is introduced into the indoor heat exchanger 16 through the connecting pipe 19, the four-way reversing valve 3 and the connecting pipe 18 to be condensed and released heat, then the gas sequentially passes through the connecting pipe 15, the balancing tank 14 (part of the refrigerant stored in the balancing tank) and the connecting pipe 13 to enter the second electronic expansion valve 12 to be throttled, and then the gas enters the energy storage module 10 through the connecting pipe 11 to be evaporated and absorbed heat, and at the moment, the energy storage module. The refrigerant sequentially passes through the connecting pipe 9, the first electronic expansion valve 8, the connecting pipe 7, enters the outdoor heat exchanger 5 to be evaporated and absorb heat, and then returns to the compressor 1 through the connecting pipe 4, the four-way reversing valve 3 and the connecting pipe 2 to complete circulation.
In the winter normal heating mode, as shown in fig. 5, the ports a and C of the four-way reversing valve 3 are communicated, the ports B and D are communicated, the outdoor fan 6 is turned on, the indoor fan 17 is turned on, and the second electronic expansion valve 12 is fully opened, which is equivalent to a connecting pipe. The refrigerant is compressed in the compressor 1 to become high-temperature and high-pressure gas, the high-temperature and high-pressure gas is introduced into the indoor heat exchanger 16 through the connecting pipe 19, the four-way reversing valve 3 and the connecting pipe 18 to be condensed and released heat, then the high-temperature gas enters the energy storage module 10 through the connecting pipe 15, the balance tank 14, the connecting pipe 13, the second electronic expansion valve 12 and the connecting pipe 11 in sequence to be condensed and released heat, then the high-temperature gas enters the first electronic expansion valve 8 through the connecting pipe 9 to be throttled, then the high-temperature gas enters the outdoor heat exchanger 5 through the connecting pipe 7 to be evaporated and absorbed heat.
In the winter waste heat recovery mode, as shown in fig. 6, the interfaces a and B of the four-way reversing valve 3 are communicated, the interfaces C and D are communicated, the outdoor fan 6 is closed, the indoor fan 17 is opened, and the first electronic expansion valve 8 is fully opened, which is equivalent to a connecting pipe. The refrigerant is compressed in the compressor 1 to become high-temperature and high-pressure gas, and the high-temperature and high-pressure gas sequentially passes through the connecting pipe 2, the four-way reversing valve 3, the connecting pipe 4, the outdoor heat exchanger 5, the connecting pipe 7, the first electronic expansion valve 8 and the connecting pipe 9 to enter the energy storage module 10 to be condensed and released heat, so that the energy storage material is heated, and the energy storage module stores heat. The refrigerant enters the second electronic expansion valve 12 through the connecting pipe 11 for throttling, enters the indoor heat exchanger 16 through the connecting pipe 13, the balancing tank 14 and the connecting pipe 15 after throttling, evaporates and absorbs heat, and returns to the compressor 1 through the connecting pipe 18, the four-way reversing valve 3 and the connecting pipe 19 in sequence to complete circulation.
In the winter defrosting mode, as shown in fig. 7, the ports a and B of the four-way reversing valve 3 are communicated with each other, the ports C and D are communicated with each other, the outdoor fan 6 is turned on, the indoor fan 17 is turned off, and the second electronic expansion valve 8 is fully opened, which is equivalent to a connecting pipe. The refrigerant is compressed in the compressor 1 to become high-temperature and high-pressure gas, is introduced into the outdoor heat exchanger 5 through the connecting pipe 2, the four-way reversing valve 3 and the connecting pipe 4 to be condensed and released, enters the first electronic expansion valve 8 through the connecting pipe 7 to be throttled, enters the energy storage module 10 through the connecting pipe 9 to be evaporated and absorbed after the throttling action, and the stored heat is released by the energy storage module at the moment. The refrigerant returns to the compressor 1 through the connecting pipe 11, the second electronic expansion valve 12, the connecting pipe 13, the balancing tank 14, the connecting pipe 15, the indoor heat exchanger 16, the connecting pipe 18, the four-way reversing valve 3 and the connecting pipe 19 in sequence, and the cycle is completed.
In the summer residual cold recovery and winter starting heating mode, the refrigerant charge amount of the system can be balanced by using the balance tank 9 to store partial refrigerant because the indoor heat exchanger 10 is used as a unique condenser for condensation and heat release at the moment.
The operator can judge whether the energy release of the energy storage module 7 is finished by two methods: firstly, the time is controlled, after the energy storage material is selected, the experience time of energy release completion can be determined according to a large number of experiments, and the unit makes a control scheme according to the experience time; secondly, the suction pressure of the compressor 1 is controlled, when the refrigeration system runs and the energy storage module 7 releases energy, the evaporation pressure is greatly reduced due to the deterioration of heat exchange at one side, the compressor 1 starts suction pressure protection, and the suction pressure protection can be used as a mark for energy storage or energy release of the energy storage module 7.
In the above embodiment, only the case of circulating the heat releasing working medium passing through the indoor heat exchanger 16 and circulating the heat absorbing working medium passing through the outdoor heat exchanger 5 when the fan is selected is shown. In fact, the power device for the circulation of the heat absorption/release working medium can be reasonably selected according to the type of the heat absorption/release working medium, the fan can be selected as the gaseous heat absorption/release working medium, and the liquid pump can be selected as the liquid heat absorption/release working medium. The pipeline and the auxiliary equipment for the circulation of the heat absorbing/releasing working medium can be selected and designed according to actual requirements. The selection of different heat absorption/release working medium circulation power devices or different heat absorption/release working medium circulation pipelines cannot be regarded as the substantial improvement of the invention, and the invention belongs to the protection scope of the invention.
In the above embodiments, all components of the refrigerant cycle are not completely shown, and in the implementation process, the refrigerant circuit is provided with common refrigeration accessories such as a liquid reservoir, a gas-liquid separator, an oil separator, a filter, a dryer, and the like, which cannot be regarded as a substantial improvement of the present invention, and shall fall into the protection scope of the present invention.
The terms "first," "second," and the like are used herein to define components, as one skilled in the art would know: the use of the words "first", "second", etc. is merely for convenience in describing the differences between the components. Unless otherwise stated, the above words have no special meaning.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art can modify the embodiments of the present invention or substitute part of the technical features, but the present invention is not limited thereto.

Claims (5)

1. An air conditioning system capable of recovering residual cold and residual heat in a room after shutdown is characterized by comprising a compressor (1), a four-way reversing valve (3), an outdoor heat exchanger (5), a first electronic expansion valve (8), an energy storage module (10), a second electronic expansion valve (12), a balance tank (14) and an indoor heat exchanger (16),
the outdoor heat exchanger (5) and the indoor heat exchanger (16) include a refrigerant passage and an air passage,
the inlet of a refrigerant channel of the outdoor heat exchanger (5), the first electronic expansion valve (8), the energy storage module (10), the second electronic expansion valve (12), the balance tank (14) and the outlet of the refrigerant channel of the indoor heat exchanger (16) are sequentially connected through connecting pipelines;
a port A of the four-way reversing valve (3) is connected with a refrigerant channel outlet of the indoor heat exchanger (16), a port B is connected with a suction port of the compressor (1), a port C is connected with an exhaust port of the compressor (1), and a port D is connected with a refrigerant channel inlet of the outdoor heat exchanger (5);
the working modes of the air conditioning system comprise a summer refrigeration mode, a summer residual cold recovery mode, a winter starting heating mode, a winter conventional heating mode, a winter residual heat recovery mode and a winter defrosting mode;
the interfaces A, B and C, D of the four-way reversing valve (3) are communicated under the modes of summer refrigeration, winter waste heat recovery and winter defrosting, the interfaces A, C and B, D of the four-way reversing valve (3) are communicated under the modes of summer waste heat recovery, winter starting heating and winter conventional heating;
in the summer refrigeration mode, both the outdoor fan (6) and the indoor fan (17) are opened, and the first electronic expansion valve (8) is fully opened;
in the summer residual cold recovery mode, the outdoor fan (6) is closed, the indoor fan (17) is opened, and the first electronic expansion valve (8) is fully opened;
in the winter starting heating mode, the outdoor fan (6) is started, the indoor fan (17) is started, and the first electronic expansion valve (8) is fully opened;
in the winter conventional heating mode, the outdoor fan (6) is started, the indoor fan (17) is started, and the second electronic expansion valve (12) is fully opened;
in the winter waste heat recovery mode, the outdoor fan (6) is closed, the indoor fan (17) is opened, and the first electronic expansion valve (8) is fully opened;
in the defrosting mode in winter, the outdoor fan (6) is started, the indoor fan (17) is closed, and the second electronic expansion valve (12) is fully opened.
2. An air conditioning system capable of recovering residual heat of indoor after shutdown as claimed in claim 1, wherein the outdoor fan (6) is correspondingly arranged in the air channel of the outdoor heat exchanger (5); an indoor fan (17) is correspondingly arranged in the air channel of the indoor heat exchanger (16).
3. The air conditioning system capable of recovering the residual heat of indoor air after shutdown as claimed in claim 1, wherein the first electronic expansion valve (8) is a high temperature electronic expansion valve.
4. The air conditioning system capable of recovering the residual heat of indoor after shutdown as claimed in claim 1, wherein the energy storage module (10) is internally provided with a reaction bed filled with energy storage material, and externally provided with heat insulation material.
5. The air conditioning system capable of recovering the residual heat of indoor air after shutdown as claimed in claim 4, wherein the energy storage material does not enter into the refrigerant cycle.
CN201910801331.8A 2019-08-28 2019-08-28 Air conditioning system capable of recovering indoor residual cold and residual heat after shutdown Active CN110595089B (en)

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