CN116164360A - Overlapping type compression multi-cycle PVT-air source multi-split heat pump air conditioning system for defrosting of outdoor heat source - Google Patents
Overlapping type compression multi-cycle PVT-air source multi-split heat pump air conditioning system for defrosting of outdoor heat source Download PDFInfo
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- CN116164360A CN116164360A CN202310149329.3A CN202310149329A CN116164360A CN 116164360 A CN116164360 A CN 116164360A CN 202310149329 A CN202310149329 A CN 202310149329A CN 116164360 A CN116164360 A CN 116164360A
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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
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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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
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
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Abstract
The invention belongs to the technical field of solar heat pumps, and provides an overlapping type compression multi-cycle PVT-air source multi-split air-source heat pump air conditioning system for defrosting an outdoor heat source. The cascade compression multi-cycle PVT-air source multi-split heat pump air conditioning system for defrosting an outdoor heat source can operate all year round in six cycles of single-stage compression PVT heating, cascade compression PVT heating, single-stage compression air source heating, cascade compression air source heating, single-stage compression air source refrigerating and defrosting of an outdoor fin heat exchanger, and defrost is carried out in a defrosting mode without taking heat from an indoor environment when the outdoor fin heat exchanger is required to defrost in a single-stage or cascade compression air source heating cycle, so that the environment adaptability of the heat pump air conditioning system is high, the heating efficiency is high, the equipment utilization rate is high, and the power generation efficiency of a photovoltaic cell is high.
Description
Technical Field
The invention relates to the technical field of solar heat pumps, in particular to an overlapping type compression multi-cycle PVT-air source multi-split air-source heat pump air conditioning system for defrosting an outdoor heat source.
Background
The Photovoltaic thermal technology utilizes the working waste heat of the Photovoltaic module by the heat exchange medium, reduces the working temperature of the Photovoltaic module and improves the Photovoltaic power generation efficiency. The PVT heat pump system is a combination of a heat pump technology and a PVT technology, can simultaneously improve the heating efficiency of a heat pump cycle and the power generation efficiency of a photovoltaic cell, and simultaneously outputs heat energy and electric energy on one set of system. The PVT-air source heat pump system can be formed by combining the air source heat pump cycle and the PVT heat pump cycle, so that the system overcomes the defects of the two systems to a certain extent, realizes the complementary advantages of the two heat sources, and has high engineering application value. The prior PVT-air source heat pump system has the following two defects:
1. the operating conditions vary drastically and the operating cycle mode is single. On the evaporation side of the heat pump system, the season rotation and day-night alternation bring about environmental temperature change, especially the photovoltaic cell heat dissipation capacity caused by the change of illumination intensity in the morning and evening in the daytime is greatly changed, and the heat is applied to the evaporator, so that the evaporation pressure of the system is greatly changed. The conventional PVT-air source heat pump system generally adopts a single-stage compression cycle, and is not suitable for operation under variable working conditions with severe evaporation pressure change caused by season rotation and day-night alternation.
2. The fin evaporator has low defrosting efficiency and low heat exchanger equipment utilization rate. When the air source heat pump system operates in winter, the outdoor air temperature is low, so that the surface of the outdoor evaporator is easy to frost, and the system performance is influenced. The solar energy can provide a higher heat source in the daytime, and the PVT-air source heat pump system combined with the air source heat pump system can greatly improve the temperature of the evaporator due to the heat dissipation of the photovoltaic cells under illumination, so that the frosting of the evaporator can be prevented to a certain extent. However, in a rainy day without illumination or at night with lower temperature, the PVT-air source heat pump system needs to be switched to an air source outdoor fin heat exchanger to heat, and at this time, the PVT-air source heat pump system is the same as a common air source heat pump system, and the outdoor fin heat exchanger still frosts, so that the existing defrosting method mainly has two types: reverse circulation defrosting and energy storage defrosting. Reverse circulation defrosting takes heat from an indoor heat exchanger, brings about larger temperature fluctuation of the indoor environment, and causes larger impact on the system due to flow direction switching of the refrigerant. The heat storage defrosting needs to be additionally provided with a heat storage heat exchanger in the system, and the conventional heat storage heat exchanger is limited by the problems of heat storage materials, structures and the like and cannot be widely popularized. In addition, in rainy days or nighttime, when the existing PVT-air source heat pump system is defrosted, no matter which of the two defrosting methods is adopted, the PVT assembly is idle during defrosting.
Disclosure of Invention
The invention aims at overcoming the technical defects in the prior art, and provides an overlapping type compression multi-cycle PVT-air source multi-split air-source heat pump air-conditioning system for defrosting an outdoor heat source, which can realize the mutual switching of single-stage compression and overlapping compression cycles during heating and can realize that heat is not taken from an indoor environment during defrosting.
The technical scheme adopted for achieving the purpose of the invention is as follows: an overlapping type compression multi-cycle PVT-air source multi-split air-source heat pump air conditioning system for defrosting an outdoor heat source comprises a low-temperature compressor 1-1, a high-temperature compressor 1-2, an outdoor fin heat exchanger 2, a PVT component 3, a throttle valve, a condensation evaporator 5, a one-way valve, a stop valve, a four-way reversing valve, an indoor heat exchanger 9 and an inverter 10;
the PVT assembly 3 is connected with an inverter 10; one end of the PVT component 3 is branched, one branch of the PVT component is connected with an air suction port of the low-temperature compressor 1-1 through a third stop valve 7-3, and an air discharge port of the low-temperature compressor 1-1 is connected with a first interface of the condensation evaporator 5 through a third one-way valve 6-3; one end of the PVT component 3 is connected with a first interface of a first four-way reversing valve 8-1 through a second one-way valve 6-2 in another branch; the second interface of the first four-way reversing valve 8-1 is connected to the air suction port of the high-temperature compressor 1-2, and the air discharge port of the high-temperature compressor 1-2 is connected to the first interface of the second four-way reversing valve 8-2; the third interface of the first four-way reversing valve 8-1 is connected to the second interface of the condensation evaporator 5; the fourth interface of the first four-way reversing valve 8-1 is connected to the fourth interface of the condensing evaporator 5; the second port of the second four-way reversing valve 8-2 is connected to the third port of the condensing evaporator through the indoor heat exchanger 9 and the third throttle valve 4-3 in sequence; the third interface of the second four-way reversing valve 8-2 is connected to the air suction port of the high-temperature compressor 1-2 through the first one-way valve 6-1; the fourth interface of the second four-way reversing valve 8-2 is connected to a pipeline between the outdoor fin heat exchanger 2 and the air suction port of the low-temperature compressor 1-1;
The other end of the PVT component 3 sequentially passes through a second throttle valve 4-2 and a second stop valve 7-2 and then is divided into two branches; one branch sequentially passes through the first stop valve 7-1, the first throttle valve 4-1 and the outdoor fin heat exchanger 2 and is connected between the third stop valve 7-3 and the air suction port of the low-temperature compressor 1-1; the other branch is connected to a pipeline between a fourth interface of the first four-way reversing valve 8-1 and a fourth interface of the condensing evaporator 5 through a fourth stop valve 7-4.
The cascade compression multi-cycle PVT-air source multi-split air-source heat pump air conditioning system for defrosting of the outdoor heat source is operated all year round in six cycles of single-stage compression PVT heating cycle, single-stage compression air source heating cycle, cascade compression PVT heating cycle, cascade compression air source heating cycle, outdoor fin heat exchanger defrosting cycle and single-stage compression air source refrigerating cycle.
When the cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system for defrosting an outdoor heat source operates in a single-stage compression PVT heating cycle, the first stop valve 7-1 and the third stop valve 7-3 are closed, and the second stop valve 7-2 and the fourth stop valve 7-3 are opened; the first interface of the second four-way reversing valve 8-2 is communicated with the second interface of the second four-way reversing valve 8-2, and the third interface of the second four-way reversing valve 8-2 is communicated with the fourth interface of the second four-way reversing valve 8-2; the low-temperature compressor 1-1 is stopped, and the high-temperature compressor 1-2 is started; the photovoltaic cells in the PVT assembly 3 generate electricity under sunlight, which is regulated by the inverter 10 to become electricity usable by the user.
When the cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system for defrosting an outdoor heat source operates in a single-stage compression air source heating cycle, the first stop valve 7-1, the third stop valve 7-3 and the fourth stop valve 7-4 are opened, and the second stop valve 7-2 is closed; the first interface of the first four-way reversing valve 8-1 is communicated with the second interface of the first four-way reversing valve 8-1, and the third interface of the first four-way reversing valve 8-1 is communicated with the fourth interface of the first four-way reversing valve 8-1; the first interface of the second four-way reversing valve 8-2 is communicated with the second interface of the second four-way reversing valve 8-2, and the third interface of the second four-way reversing valve 8-2 is communicated with the fourth interface of the second four-way reversing valve 8-2; the low-temperature compressor 1-1 is stopped, and the high-temperature compressor 1-2 is started; the photovoltaic cells in the PVT assembly 3 generate electricity under the irradiation of sunlight, and the electricity is changed into electricity which can be used by a user through the adjustment of the inverter 10;
when the cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system for defrosting an outdoor heat source runs in a cascade compression PVT heating cycle, the first stop valve 7-1 is closed, the second stop valve 7-2, the third stop valve 7-3 and the fourth stop valve 7-3 are opened, the first interface of the first four-way reversing valve 8-1 is communicated with the fourth interface of the first four-way reversing valve 8-1, the second interface of the first four-way reversing valve 8-1 is communicated with the third interface of the first four-way reversing valve 8-1, the first interface of the second four-way reversing valve 8-2 is communicated with the second interface of the second four-way reversing valve 8-2, the third interface of the second four-way reversing valve 8-2 is communicated with the fourth interface of the second four-way reversing valve 8-2, and the low-temperature compressor 1 and the high-temperature compressor 1-2 are started; the photovoltaic cells in the PVT assembly 3 generate electricity under the irradiation of sunlight, and the electricity is changed into electricity which can be used by a user through the adjustment of the inverter 10;
When the cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system for defrosting an outdoor heat source runs in a cascade compression air source heating cycle, a first stop valve 7-1 and a fourth stop valve 7-4 are opened, a second stop valve 7-2 and a third stop valve 7-3 are closed, a first interface of the first four-way reversing valve 8-1 is communicated with a fourth interface of the first four-way reversing valve 8-1, a second interface of the first four-way reversing valve 8-1 is communicated with a third interface of the first four-way reversing valve 8-1, a first interface of the second four-way reversing valve 8-2 is communicated with a second interface of the second four-way reversing valve 8-2, a third interface of the second four-way reversing valve 8-2 is communicated with a fourth interface of the second four-way reversing valve 8-2, and the low-temperature compressor 1 and the high-temperature compressor 1-2 are started; the photovoltaic cells in the PVT assembly 3 generate electricity under the irradiation of sunlight, and the electricity is changed into electricity which can be used by a user through the adjustment of the inverter 10;
when the cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system for defrosting an outdoor heat source operates in a defrosting cycle of an outdoor fin heat exchanger, a first stop valve 7-1 and a second stop valve 7-2 are opened, a third stop valve 7-3 and a fourth stop valve 7-4 are closed, a first interface of the first four-way reversing valve 8-1 is communicated with a second interface of the first four-way reversing valve 8-1, a third interface of the first four-way reversing valve 8-1 is communicated with a fourth interface of the first four-way reversing valve 8-1, a first interface of the second four-way reversing valve 8-2 is communicated with a fourth interface of the second four-way reversing valve 8-2, a second interface of the second four-way reversing valve 8-2 is communicated with a third interface of the second four-way reversing valve 8-2, the low-temperature compressor 1 is turned off, the high-temperature compressor 1-2 is turned on, and the opening of the first throttle valve 4-1 is adjusted to the maximum; the photovoltaic cells in the PVT assembly 3 generate electricity under the irradiation of sunlight, and the electricity is changed into electricity which can be used by a user through the adjustment of the inverter 10;
When the cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system for defrosting an outdoor heat source operates in a single-stage compression air source refrigeration cycle, the first stop valve 7-1 and the fourth stop valve 7-4 are opened, the second stop valve 7-2 and the third stop valve 7-3 are closed, the first interface of the first four-way reversing valve 8-1 is communicated with the second interface of the first four-way reversing valve 8-1, the third interface of the first four-way reversing valve 8-1 is communicated with the fourth interface of the first four-way reversing valve 8-1, the first interface of the second four-way reversing valve 8-2 is communicated with the fourth interface of the second four-way reversing valve 8-2, the second interface of the second four-way reversing valve 8-2 is communicated with the third interface of the second four-way reversing valve 8-2, the low-temperature compressor 1 is turned off, the high-temperature compressor 1-2 is turned on, and the opening of the first throttle valve 4-1 is adjusted to the maximum.
The PVT component 3 is in a flat box type, a tube plate type, an inflation plate type or a flat plate type; the high-temperature compressor 1-2 and the low-temperature compressor 1-1 are any one of a scroll compressor, a rotor compressor, a screw compressor and a piston compressor; the first throttle valve 4-1, the second throttle valve 4-2 and the third throttle valve 4-3 are electronic expansion valves, thermal expansion valves, capillary tubes or orifice plate throttle devices; the first stop valve 7-1, the second stop valve 7-2, the third stop valve 7-3 and the fourth stop valve 7-4 are electromagnetic valves, hand valves or ball valves.
The cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system for defrosting an outdoor heat source realizes six circulation operations of single-stage compression PVT heating, cascade compression PVT heating, single-stage compression air source heating, cascade compression air source heating, outdoor fin heat exchanger defrosting and single-stage compression air source heating and cooling according to the environmental temperature, illumination intensity, heating and cooling requirements.
In the daytime with higher ambient temperature and stronger illumination in transitional seasons, the cascade compression multi-cycle PVT-air source multi-split air-source heat pump air conditioning system for defrosting the outdoor heat source operates in a single-stage compression PVT heating cycle, and an operation principle diagram is shown in figure 2.
In the daytime or the nighttime without illumination, the outdoor heat source defrosting cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system of the invention operates in a single-stage compression air source heating cycle, and the operation principle diagram is shown in figure 3.
In the daytime when the ambient temperature is low and the illumination is strong in the cold winter, the cascade compression multi-cycle PVT-air source multi-split air source heat pump air conditioning system for defrosting the outdoor heat source operates in a cascade compression PVT heating cycle, and an operation principle diagram is shown in figure 4.
The cascade compressed multi-cycle PVT-air source multi-on-line heat pump air conditioning system for defrosting the outdoor heat source operates in a cascade compressed air source heating cycle in the cold winter with lower ambient temperature and low illumination daytime or in the dark night, and the operation principle diagram is shown in figure 5.
In the daytime of low illumination or in the nighttime of no illumination, the cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system for defrosting the outdoor heat source continuously operates for a period of time in a single-stage compression air source heating cycle or in a cascade compression air source heating cycle, and when the outdoor fin heat exchanger needs to be defrosted, the cascade compression PVT multi-on-line system with defrosting function operates in a defrosting cycle of the outdoor fin heat exchanger, and an operation schematic diagram is shown in figure 6.
In hot summer, the cascade compressed multi-cycle PVT-air source multi-on-line heat pump air conditioning system for defrosting an outdoor heat source operates in a single-stage compressed air source refrigeration mode, and an operation principle diagram is shown in fig. 7.
Compared with the prior art, the invention has the beneficial effects that:
1. the cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system for defrosting the outdoor heat source can operate in a single-stage compression PVT heating cycle or a single-stage compression air source heating cycle under the environment outside a greenhouse in transitional seasons, can also operate in a cascade compression PVT heating cycle or a cascade compression air source heating cycle under the environment outside a low-temperature greenhouse in winter, and can also operate in a single-stage compression air source refrigerating cycle in hot seasons in summer. The heat pump multi-split air conditioning system is flexible in switching among heating and refrigerating cycles, strong in environmental adaptability and high in efficiency;
2. When defrosting demands exist after single-stage compressed air source heating circulation or long-term operation of the cascade compressed air source heating circulation, the cascade compressed multi-cycle PVT-air source multi-on-line heat pump air conditioning system for defrosting an outdoor heat source can take heat from an idle PVT component at the same outdoor environment temperature without taking heat from an indoor environment, indoor fake-free comfort is high, defrosting efficiency of an outdoor fin heat exchanger is high, speed is high, pressure change of a multi-on-line system before and after defrosting is slower, impact force on the system is smaller, system stability is better, and equipment utilization rate is higher by utilizing the idle PVT component;
3. the cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system for defrosting the outdoor heat source operates in a cascade compression PVT heating cycle under the outdoor environment with sufficient low-temperature illumination, the PVT component temperature is lower, and the photovoltaic cell power generation efficiency is higher.
Drawings
FIG. 1 is a schematic diagram of an cascade compression multi-cycle PVT-air source multi-split heat pump air conditioning system for defrosting an outdoor heat source according to the present invention;
in the figure: 1-1, a low-temperature compressor; 1-2, a high temperature compressor; 2. an outdoor fin heat exchanger; 3. a PVT component; 4-1, a first throttle valve; 4-2, a second throttle valve; 4-3, a third throttle valve; 5. a condensing evaporator; 6-1, a first one-way valve; 6-2, a second one-way valve; 7-1, a first stop valve; 7-2, a second stop valve; 7-3, a third stop valve; 7-4, a fourth stop valve; 8-1, a first four-way reversing valve; 8-2, a second four-way reversing valve; 9. an indoor heat exchanger; 10. an inverter.
FIG. 2 is a schematic diagram showing the operation of the cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system for defrosting an outdoor heat source according to the invention in a single-stage compression PVT heating cycle;
FIG. 3 is a schematic diagram showing the operation of the cascade compressed multi-cycle PVT-air source multi-on-line heat pump air conditioning system with single-stage compressed air source heating cycle for defrosting an outdoor heat source according to the invention;
FIG. 4 is a schematic diagram showing the operation of the cascade compression PVT-air source multi-on-line heat pump air conditioning system for defrosting an outdoor heat source according to the invention in cascade compression PVT heating cycle;
FIG. 5 is a schematic diagram showing the operation of the cascade compressed air source heating cycle of the outdoor heat source defrosting cascade compressed multi-cycle PVT-air source multi-on-line heat pump air conditioning system of the present invention;
FIG. 6 is a schematic diagram showing the operation of the cascade compression multi-cycle PVT-air source multi-split heat pump air conditioning system with outdoor fin heat exchanger defrost cycle of the present invention;
FIG. 7 is a schematic diagram showing the operation of the cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system for defrosting an outdoor heat source according to the present invention with a single-stage compressed air source refrigeration cycle;
FIG. 8 is a schematic diagram of the condensing evaporator interface of the cascade compression multi-cycle PVT-air source multi-split heat pump air conditioning system of the present invention for defrosting an outdoor heat source;
In the figure: 5a, condensing the first interface of the evaporator; 5b, condensing the second interface of the evaporator; 5c, condensing the third interface of the evaporator; and 5d, condensing the fourth interface of the evaporator.
FIG. 9 is a schematic diagram of a four-way reversing valve interface in an cascade compression multi-cycle PVT-air source multi-split heat pump air conditioning system with outdoor heat source defrosting according to the present invention;
in the figure: 8a, a first interface of the four-way reversing valve; 8b, a second interface of the four-way reversing valve; 8c, a third interface of the four-way reversing valve; 8d, a fourth interface of the four-way reversing valve.
Detailed Description
In the description of the present invention, unless explicitly specified and limited otherwise, the terms "high pressure", "medium pressure" and "low pressure" are to be understood in a broad sense as referring to the relative values of the pressures in the same refrigerant circuit, for example, in a cascade heating mode, "high pressure", "medium pressure" in the high temperature circuit refer to the relative values in the same high temperature refrigerant circuit, the pressure between the high temperature compressor suction port and the throttle outlet is medium pressure, the pressure between the high temperature compressor discharge port and the throttle inlet is high pressure, the "medium pressure", "low pressure" in the low temperature circuit refer to the relative values in the same low temperature refrigerant circuit, the pressure between the low temperature compressor suction port and the throttle outlet is low pressure, and the pressure between the low temperature compressor discharge port and the throttle inlet is medium pressure.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The principle diagram of the cascade compression multi-cycle PVT-air source multi-split air-source heat pump air-conditioning system for defrosting an outdoor heat source is shown in fig. 1, and the system comprises a low-temperature compressor 1-1, a high-temperature compressor 1-2, an outdoor fin heat exchanger 2, a PVT component 3, a first throttle valve 4-1, a second throttle valve 4-2, a third throttle valve 4-3, a condensing evaporator 5, a first one-way valve 6-1, a second one-way valve 6-2, a third one-way valve 6-3, a first stop valve 7-1, a second stop valve 7-2, a third stop valve 7-3, a fourth stop valve 7-3, a first four-way reversing valve 8-1, a second four-way reversing valve 8-2, an indoor heat exchanger 9 and an inverter 10. The exhaust port of the low-temperature compressor 1-1 is connected with the first interface of the condensation evaporator 5 through the third one-way valve 6-3, the air suction port of the low-temperature compressor 1-1 is connected with one end of the PVT component 3 through the third stop valve 7-3, the air suction port of the low-temperature compressor 1-1 is also connected with one end of the outdoor fin heat exchanger 2 and the fourth interface of the second four-way reversing valve 8-2, the exhaust port of the high-temperature compressor 1-2 is connected with the first interface of the second four-way reversing valve 8-2, the third interface of the second four-way reversing valve 8-2 is connected with the air suction port of the high-temperature compressor 1-2 through the first one-way valve 6-1, and the air suction port of the high-temperature compressor 1-2 is also connected with the second interface of the first four-way reversing valve 8-1; the second port of the second four-way reversing valve 8-2 is connected with the indoor heat exchanger 9, the indoor heat exchanger 9 is connected with the third port of the condensation evaporator 5 through the third throttle valve 4-3, the second port of the condensation evaporator 5 is connected with the third port of the first four-way reversing valve 8-1, and the fourth port of the condensation evaporator 5 is connected with the fourth port of the first four-way reversing valve 8-1 and one end of the fourth stop valve 7-4; the other end of the fourth stop valve 7-4 is connected with one end of the first stop valve 7-1 and one end of the second stop valve 7-2, the other end of the first stop valve 7-1 is connected with the other end of the outdoor fin heat exchanger 2 through the first throttle valve 4-1, the other end of the second stop valve 7-2 is connected with the other end of the PVT assembly 3 through the second throttle valve 4-2, and a first interface of the first four-way reversing valve 8-1 is connected with one end of PVT and the other end of the third stop valve 7-3 through the second one-way valve 6-2.
The cascade compression multi-cycle PVT-air source multi-split heat pump air conditioning system for defrosting an outdoor heat source realizes six modes of single-stage compression PVT heating, cascade compression PVT heating, single-stage compression air source heating, cascade compression air source heating, defrosting of the outdoor fin heat exchanger 2 and single-stage compression air source refrigerating according to the environmental temperature, illumination intensity, heating and defrosting requirements.
In the daytime with higher ambient temperature and stronger illumination in transitional seasons, the cascade compression multi-cycle PVT-air source multi-split air-source heat pump air conditioning system for defrosting the outdoor heat source operates in a single-stage compression PVT heating cycle, and an operation principle diagram is shown in figure 2. Closing the first stop valve 7-1 and the third stop valve 7-3, and opening the second stop valve 7-2 and the fourth stop valve 7-4; the first interface of the second four-way reversing valve 8-2 is communicated with the second interface of the second four-way reversing valve 8-2, and the third interface of the second four-way reversing valve 8-2 is communicated with the fourth interface of the second four-way reversing valve 8-2; the low-temperature compressor 1-1 is stopped, and the high-temperature compressor 1-2 is started; the photovoltaic cells in the PVT assembly 3 generate electricity under sunlight, and the electricity is changed into electricity which can be used by a user through the adjustment of the inverter 10.
The refrigerant thermodynamic process is as follows: one end of the PVT component 3 is used for conveying low-pressure low-temperature refrigerant gas, and the low-pressure low-temperature refrigerant gas is sequentially conveyed to an air suction port of the high-temperature compressor 1-2 through the second one-way valve 6-2, the first interface of the first four-way reversing valve 8-1 and the second interface of the first four-way reversing valve 8-1; the low-pressure low-temperature refrigerant gas is converted into high-pressure high-temperature overheated gas through compression and pressure boosting, and the high-pressure high-temperature overheated gas is conveyed into the indoor heat exchanger 9 through a first interface of the second four-way reversing valve 8-2 and a second interface of the second four-way reversing valve 8-2; the high-pressure high-temperature overheated gas is condensed into high-pressure liquid by indoor air in the indoor heat exchanger 9, and meanwhile, a heating phenomenon is generated indoors; the high-pressure liquid flowing out of the indoor heat exchanger 9 is expanded and depressurized through a third throttle valve 4-3 to become a medium-pressure gas-liquid mixture, and the medium-pressure gas-liquid mixture flows into a third interface of the condensing evaporator 5; the medium-pressure gas-liquid mixture sequentially passes through a third interface of a first four-way reversing valve 8-1, a fourth interface of the first four-way reversing valve 8-1, a fourth stop valve 7-4 and a second stop valve 7-2 through a second interface of a condensing evaporator 5, enters a second throttle valve 4-2, and becomes low-pressure gas-liquid mixed refrigerant after expansion and depressurization to enter the other end of the PVT component 3; the low-pressure gas-liquid mixed refrigerant is changed into low-pressure low-temperature refrigerant gas after absorbing the heat of the photovoltaic cell in the PVT component 3, and is output through the other end of the PVT component 3, so that the refrigeration cycle is completed.
In the daytime or the nighttime without illumination, the outdoor heat source defrosting cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system of the invention operates in a single-stage compression air source heating cycle, and the operation principle diagram is shown in figure 3. The first stop valve 7-1, the third stop valve 7-3 and the fourth stop valve 7-4 are opened, the second stop valve 7-2 is closed, the first interface of the first four-way reversing valve 8-1 is communicated with the second interface of the first four-way reversing valve 8-1, the third interface of the first four-way reversing valve 8-1 is communicated with the fourth interface of the first four-way reversing valve 8-1, the first interface of the second four-way reversing valve 8-2 is communicated with the second interface of the second four-way reversing valve 8-2, the third interface of the second four-way reversing valve 8-2 is communicated with the fourth interface of the second four-way reversing valve 8-2, the low-temperature compressor 1-1 is stopped, and the high-temperature compressor 1-2 is started; the photovoltaic cells in the PVT assembly 3 generate electricity under sunlight, and the electricity is changed into electricity which can be used by a user through the adjustment of the inverter 10.
The refrigerant thermodynamic process is as follows: one end of the outdoor fin heat exchanger 2 is used for conveying low-pressure low-temperature refrigerant gas, the low-pressure low-temperature refrigerant gas sequentially passes through a third stop valve 7-3, a second one-way valve 6-2, a first interface of a first four-way reversing valve 8-1 and a second interface of the first four-way reversing valve 8-1 to an air suction port of the high-temperature compressor 1-2, the low-pressure low-temperature refrigerant gas is compressed and boosted by the high-temperature compressor 1-2 to become high-pressure high-temperature superheated gas, the high-pressure high-temperature superheated gas is conveyed into the indoor heat exchanger 9 through the first interface of the second four-way reversing valve 8-2 and the second interface of the second four-way reversing valve 8-2, the high-pressure high-temperature superheated gas is condensed by indoor air in the indoor heat exchanger 9 to become high-pressure liquid, and meanwhile, a heating phenomenon is generated indoors; the high-pressure liquid flowing out of the indoor heat exchanger 9 is expanded and depressurized through the third throttling valve 4-3 to become a medium-pressure gas-liquid mixture, and then sequentially enters the first throttling valve 4-1 through the third interface of the condensing evaporator 5, the second interface of the condensing evaporator 5, the third interface of the first four-way reversing valve 8-1, the fourth stop valve 7-4 and the first stop valve 7-1, and becomes a low-pressure gas-liquid mixed refrigerant after being expanded and depressurized to enter the other end of the outdoor fin heat exchanger 2, and the low-pressure gas-liquid mixed refrigerant becomes a low-pressure low-temperature refrigerant gas after absorbing heat in air in the outdoor fin heat exchanger 2, and is output from the other end of the outdoor fin heat exchanger 2 to complete refrigeration cycle.
In the daytime when the ambient temperature is low and the illumination is strong in the cold winter, the cascade compression multi-cycle PVT-air source multi-split air source heat pump air conditioning system for defrosting the outdoor heat source operates in a cascade compression PVT heating cycle, and an operation principle diagram is shown in figure 4. The first stop valve 7-1 is closed, the second stop valve 7-2, the third stop valve 7-3 and the fourth stop valve 7-4 are opened, the first interface of the first four-way reversing valve 8-1 is communicated with the fourth interface of the first four-way reversing valve 8-1, the second interface of the first four-way reversing valve 8-1 is communicated with the third interface of the first four-way reversing valve 8-1, the first interface of the second four-way reversing valve 8-2 is communicated with the second interface of the second four-way reversing valve 8-2, the third interface of the second four-way reversing valve 8-2 is communicated with the fourth interface of the second four-way reversing valve 8-2, and the low-temperature compressor 1-1 and the high-temperature compressor 1-2 are started; the photovoltaic cells in the PVT assembly 3 generate electricity under sunlight, and the electricity is changed into electricity which can be used by a user through the adjustment of the inverter 10.
The refrigerant thermodynamic process is as follows: the cascade compression system comprises a low-temperature loop and a high-temperature loop, wherein the low-temperature loop is used for circulating a low-temperature refrigerant, and the high-temperature loop is used for completing the high-temperature refrigerant circulation.
Low temperature refrigerant cycle: one end of the PVT component 3 outputs low-pressure low-temperature refrigerant gas, the low-pressure low-temperature refrigerant gas is input into an air suction port of the low-temperature compressor 1-1 through a third stop valve 7-3, the low-pressure low-temperature refrigerant gas is compressed and boosted by the low-temperature compressor 1-1 to become medium-pressure overheat gas, the medium-pressure overheat gas enters a first interface of the condensation evaporator 5 through a third one-way valve 6-3, the medium-pressure overheat gas transfers heat of a low-temperature loop to a high-temperature loop of the condensation evaporator 5 and is condensed into medium-pressure liquid, the medium-pressure overheat gas flows out from a fourth interface of the condensation evaporator 5, the medium-pressure liquid sequentially passes through a fourth stop valve 7-4 and a second stop valve 7-2 and enters a second throttle valve 4-2, the medium-pressure liquid is expanded and decompressed by the second throttle valve 4-2 and becomes low-pressure gas-liquid mixed refrigerant, the low-pressure gas mixed refrigerant absorbs the heat of a photovoltaic cell in the PVT component 3 and becomes low-pressure low-temperature refrigerant gas, and the low-pressure overheat gas is output from the other end of the PVT component 3, and the low-temperature loop circulation is completed;
high temperature refrigerant cycle: the second interface of the condensing evaporator 5 outputs medium-pressure medium-temperature refrigerant gas, and the medium-pressure medium-temperature refrigerant gas sequentially passes through the third interface of the first four-way reversing valve 8-1 and the second interface of the first four-way reversing valve 8-1 to enter the high-temperature compressor 1-2; the medium-pressure medium-temperature refrigerant gas is compressed and boosted by the high-temperature compressor 1-2 to become high-pressure overheat gas, and the high-pressure overheat gas sequentially passes through a first interface of the second four-way reversing valve 8-2 and a second interface of the second four-way reversing valve 8-2 to enter the indoor heat exchanger 9, so that the high-pressure overheat gas is condensed by indoor air in the indoor heat exchanger 9 to become high-pressure liquid, and meanwhile, a heating phenomenon is generated indoors; the high-pressure liquid flowing out of the indoor heat exchanger 9 is expanded and depressurized through the third throttle valve 4-3 to become a medium-pressure gas-liquid mixture, the medium-pressure gas-liquid mixture enters the third interface of the condensation evaporator 5, the medium-pressure gas-liquid mixture absorbs the heat of the low-temperature loop in the condensation evaporator 5 to become medium-pressure medium-temperature refrigerant gas, and the medium-pressure medium-temperature refrigerant gas is output from the second interface of the condensation evaporator 5 to complete the circulation of the high-temperature loop. The medium pressure value in the high temperature loop is lower than the medium pressure value in the low temperature loop.
The cascade compressed multi-cycle PVT-air source multi-on-line heat pump air conditioning system for defrosting the outdoor heat source operates in a cascade compressed air source heating cycle in the cold winter with lower ambient temperature and low illumination daytime or in the dark night, and the operation principle diagram is shown in figure 5. The first stop valve 7-1 and the fourth stop valve 7-4 are opened, the second stop valve 7-2 and the third stop valve 7-3 are closed, the first interface of the first four-way reversing valve 8-1 is communicated with the fourth interface of the first four-way reversing valve 8-1, the second interface of the first four-way reversing valve 8-1 is communicated with the third interface of the first four-way reversing valve 8-1, the first interface of the second four-way reversing valve 8-2 is communicated with the second interface of the second four-way reversing valve 8-2, the third interface of the second four-way reversing valve 8-2 is communicated with the fourth interface of the second four-way reversing valve 8-2, and the low-temperature compressor 1-1 and the high-temperature compressor 1-2 are started; the photovoltaic cells in the PVT assembly 3 generate electricity under sunlight, and the electricity is changed into electricity which can be used by a user through the adjustment of the inverter 10.
The refrigerant thermodynamic process is as follows: the cascade compression system comprises a low-temperature loop and a high-temperature loop, wherein the low-temperature loop is used for circulating a low-temperature refrigerant, and the high-temperature loop is used for circulating a high-temperature refrigerant.
Low temperature refrigerant cycle: one end of the outdoor fin heat exchanger 2 outputs low-pressure low-temperature refrigerant gas to an air suction port of the low-temperature compressor 1-1, the low-pressure low-temperature refrigerant gas is compressed and boosted by the low-temperature compressor 1-1 to become medium-pressure superheated gas, the medium-pressure superheated gas enters a first interface of the condensing evaporator 5 through a third one-way valve 6-3, low-temperature loop heat of the medium-pressure superheated gas is transferred to a high-temperature loop of the condensing evaporator 5 and then condensed into medium-pressure liquid, the medium-pressure liquid flows out from a fourth interface of the condensing evaporator 5, sequentially passes through a fourth stop valve 7-4 and a first stop valve 7-1 and enters a first throttle valve 4-1, and the medium-pressure liquid is expanded and decompressed by the first throttle valve 4-1 and becomes low-pressure gas-liquid mixed refrigerant to enter the other end of the outdoor fin heat exchanger 2; the low-pressure gas-liquid mixed refrigerant is changed into low-pressure low-temperature refrigerant gas after absorbing heat in the air in the outdoor fin heat exchanger 2, and is output from one end of the outdoor fin heat exchanger 2 to complete low-temperature loop circulation;
high temperature refrigerant cycle: the second interface of the condensing evaporator 5 outputs medium-pressure medium-temperature refrigerant gas, and the medium-pressure medium-temperature refrigerant gas is sequentially conveyed to the air suction port of the high-temperature compressor 1-2 through the third interface of the first four-way reversing valve 8-1 and the second interface of the first four-way reversing valve 8-1; the medium-pressure medium-temperature refrigerant gas is compressed and boosted by the high-temperature compressor 1-2 to become high-pressure superheated gas, the high-pressure superheated gas sequentially passes through a first interface of the second four-way reversing valve 8-2 and a second interface of the second four-way reversing valve 8-2 to enter the indoor heat exchanger 9, the high-pressure superheated gas is condensed by indoor air in the indoor heat exchanger 9 to become high-pressure liquid, meanwhile, a heating phenomenon is generated in the indoor, the high-pressure liquid flowing out of the indoor heat exchanger 9 is expanded and depressurized by the third throttle valve 4-3 to become a medium-pressure gas-liquid mixture, the medium-pressure gas-liquid mixture enters a third interface of the condensing evaporator 5, the medium-pressure gas-liquid mixture absorbs low-temperature loop heat in the condensing evaporator 5 and becomes medium-pressure medium-temperature refrigerant gas to be output from the second interface of the condensing evaporator 5, and the high-temperature loop circulation is completed. The medium pressure value in the high temperature loop is lower than the medium pressure value in the low temperature loop.
In the daytime of low illumination or in the nighttime of no illumination, the cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system for defrosting the outdoor heat source continuously operates for a period of time in a single-stage compression air source heating cycle or in a cascade compression air source heating cycle, and when the outdoor fin heat exchanger 2 needs to be defrosted, the cascade compression PVT multi-on-line system with defrosting function operates in a defrosting mode of the outdoor fin heat exchanger 2, and an operation principle diagram is shown in figure 6. The first stop valve 7-1 and the second stop valve 7-2 are opened, the third stop valve 7-3 and the fourth stop valve 7-4 are closed, the first interface of the first four-way reversing valve 8-1 is communicated with the second interface of the first four-way reversing valve 8-1, the third interface of the first four-way reversing valve 8-1 is communicated with the fourth interface of the first four-way reversing valve 8-1, the first interface of the second four-way reversing valve 8-2 is communicated with the fourth interface of the second four-way reversing valve 8-2, the second interface of the second four-way reversing valve 8-2 is communicated with the third interface of the second four-way reversing valve 8-2, the low-temperature compressor 1-1 is shut down, the high-temperature compressor 1-2 is started, and the opening of the first throttle valve 4-1 is regulated to the maximum; the photovoltaic cells in the PVT assembly 3 generate electricity under the irradiation of sunlight, and the electricity is regulated by the inverter 10 to be usable by users
The refrigerant thermodynamic process is as follows: one end of the PVT component 3 outputs low-pressure low-temperature refrigerant gas, and the low-pressure low-temperature refrigerant gas sequentially passes through the second one-way valve 6-2, the first interface of the first four-way reversing valve 8-1 and the second interface of the first four-way reversing valve 8-1 to the air suction port of the high-temperature compressor 1-2, and is compressed and boosted by the high-temperature compressor 1-2 to become high-pressure superheated gas; the high-pressure overheat gas enters the other end of the outdoor fin heat exchanger 2 through a first interface of the second four-way reversing valve 8-2 and a fourth interface of the second four-way reversing valve 8-2; the high-pressure superheated gas is released into high-pressure liquid in the outdoor fin heat exchanger 2, and meanwhile, the frost layer on the surface of the fin is heated and melted; the high-pressure liquid flowing out from one end of the outdoor fin heat exchanger 2 enters the second throttle valve 4-2 through the first throttle valve 4-1, the first stop valve 7-1 and the second stop valve 7-2, the high-pressure liquid is expanded and depressurized through the second throttle valve 4-2 and then becomes low-pressure gas-liquid mixed refrigerant to enter the other end of the PVT assembly 3, the low-pressure gas-liquid mixed refrigerant absorbs heat in the PVT assembly 3 and outdoor air in the PVT assembly 3 and becomes low-pressure low-temperature refrigerant gas, and the low-pressure gas-liquid mixed refrigerant is output from one end of the PVT assembly 3 to finish defrosting circulation.
In hot summer, the cascade compression PVT multi-split system with defrosting function operates in a single-stage compressed air source refrigerating mode, and an operation principle diagram is shown in fig. 7. The first stop valve 7-1 and the fourth stop valve 7-3 are opened, the second stop valve 7-2 and the third stop valve 7-3 are closed, the first interface of the first four-way reversing valve 8-1 is communicated with the second interface of the first four-way reversing valve 8-1, the third interface of the first four-way reversing valve 8-1 is communicated with the fourth interface of the first four-way reversing valve 8-1, the first interface of the second four-way reversing valve 8-2 is communicated with the fourth interface of the second four-way reversing valve 8-2, the second interface of the second four-way reversing valve 8-2 is communicated with the third interface of the second four-way reversing valve 8-2, the low-temperature compressor 1-1 is shut down, the high-temperature compressor 1-2 is started, and the opening of the first throttle valve 4-1 is regulated to the maximum. The photovoltaic cells in the PVT assembly 3 generate electricity under sunlight, and the electricity is changed into electricity which can be used by a user through the adjustment of the inverter 10.
The refrigerant thermodynamic process is as follows: the indoor heat exchanger 9 outputs low-pressure low-temperature refrigerant gas, the low-pressure low-temperature refrigerant gas sequentially passes through a second interface of the second four-way reversing valve 8-2, a third interface of the second four-way reversing valve 8-2 and a first one-way valve 6-1 to be input into an air suction port of the high-temperature compressor 1-2, the low-pressure low-temperature refrigerant gas is compressed and boosted by the high-temperature compressor 1-2 to be changed into high-pressure superheated gas, and the high-pressure superheated gas enters the other end of the outdoor fin heat exchanger 2 through the first interface of the second four-way reversing valve 8-2 and the fourth interface of the second four-way reversing valve 8-2; the high-pressure superheated gas is cooled by air in the outdoor fin heat exchanger 2 to be changed into high-pressure liquid, the high-pressure liquid flowing out from one end of the outdoor fin heat exchanger 2 enters the third throttle valve 4-3 through the first throttle valve 4-1, the first stop valve 7-1, the fourth stop valve 7-4, the fourth interface of the first four-way reversing valve 8-1, the third interface of the first four-way reversing valve 8-1, the second interface of the condensation evaporator 5 and the third interface of the condensation evaporator 5, the high-pressure liquid is expanded and depressurized through the third throttle valve 4-3 to be changed into low-pressure gas-liquid mixed refrigerant to enter the indoor heat exchanger 9, and the low-pressure gas-liquid mixed refrigerant is absorbed by the indoor air in the indoor heat exchanger 9 to be changed into low-pressure low-temperature refrigerant gas to be output, so that the refrigerating cycle of the indoor heat exchanger 9 is completed.
The PVT component can be flat box type, tube plate type, inflation plate type or flat plate type.
The compressor is any one of a scroll compressor, a rotor compressor, a screw compressor and a piston compressor.
The first throttle valve, the second throttle valve and the third throttle valve are electronic expansion valves, thermal expansion valves, capillary tubes or orifice plate throttle devices.
The first stop valve, the second stop valve, the third stop valve and the fourth stop valve are electromagnetic valves, hand valves or ball valves.
As shown in fig. 8: the specific positions of the interfaces of the condensation evaporator 5 are as follows, namely a first interface 5a of the condensation evaporator, a second interface 5b of the condensation evaporator, a third interface 5c of the condensation evaporator and a fourth interface 5d of the condensation evaporator.
As shown in fig. 9: the specific positions of the four-way reversing valve interfaces are as follows, namely a first four-way reversing valve interface 8a, a second four-way reversing valve interface 8b, a third four-way reversing valve interface 8c and a fourth four-way reversing valve interface 8d.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (9)
1. The cascade type compression multi-cycle PVT-air source multi-split air-source heat pump air-conditioning system for defrosting an outdoor heat source is characterized by comprising a low-temperature compressor (1-1), a high-temperature compressor (1-2), an outdoor fin heat exchanger (2), a PVT component (3), a throttle valve, a condensing evaporator (5), a one-way valve, a stop valve, a four-way reversing valve, an indoor heat exchanger (9) and an inverter (10);
the PVT assembly (3) is connected with the inverter (10); one end of the PVT component (3) is branched, one branch of the PVT component is connected with an air suction port of the low-temperature compressor (1-1) through a third stop valve (7-3), and an air discharge port of the low-temperature compressor (1-1) is connected with a first interface of the condensation evaporator (5) through a third one-way valve (6-3); one end of the PVT component (3) is connected with a first interface of a first four-way reversing valve (8-1) through the other branch of the second one-way valve (6-2); the second interface of the first four-way reversing valve (8-1) is connected to the air suction port of the high-temperature compressor (1-2), and the air discharge port of the high-temperature compressor (1-2) is connected with the first interface of the second four-way reversing valve (8-2); the third interface of the first four-way reversing valve (8-1) is connected to the second interface of the condensing evaporator (5); the fourth interface of the first four-way reversing valve (8-1) is connected to the fourth interface of the condensing evaporator (5); the second port of the second four-way reversing valve (8-2) sequentially passes through the indoor heat exchanger (9) and the third throttle valve (4-3) to be connected to the third port of the condensing evaporator; the third interface of the second four-way reversing valve (8-2) is connected to the air suction port of the high-temperature compressor (1-2) through the first one-way valve (6-1); a fourth interface of the second four-way reversing valve (8-2) is connected to a pipeline between the outdoor fin heat exchanger (2) and the air suction port of the low-temperature compressor (1-1);
The other end of the PVT component (3) sequentially passes through a second throttle valve (4-2) and a second stop valve (7-2) and then is divided into two branches; one branch sequentially passes through the first stop valve (7-1), the first throttle valve (4-1) and the outdoor fin heat exchanger (2) and is connected between the third stop valve (7-3) and the air suction port of the low-temperature compressor (1-1); the other branch is connected to a pipeline between a fourth interface of the first four-way reversing valve (8-1) and a fourth interface of the condensing evaporator (5) through a fourth stop valve (7-4).
2. The outdoor heat source defrost cascade compression multi-cycle PVT-air source multi-split air-conditioning heat pump air-conditioning system of claim 1, wherein the outdoor heat source defrost cascade compression multi-cycle PVT-air source multi-split air-conditioning heat pump air-conditioning system operates in six cycles, namely, a single-stage compression PVT heating cycle, a single-stage compression air source heating cycle, a cascade compression PVT heating cycle, a cascade compression air source heating cycle, an outdoor fin heat exchanger defrost cycle, a single-stage compression air source refrigeration cycle.
3. The cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system for defrosting an outdoor heat source according to claim 2, wherein when the cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system for defrosting an outdoor heat source operates in a single-stage compression PVT heating cycle, the first stop valve (7-1) and the third stop valve (7-3) are closed, and the second stop valve (7-2) and the fourth stop valve (7-3) are opened; the first interface of the second four-way reversing valve (8-2) is communicated with the second interface of the second four-way reversing valve (8-2), and the third interface of the second four-way reversing valve (8-2) is communicated with the fourth interface of the second four-way reversing valve (8-2); the low-temperature compressor (1-1) is stopped, and the high-temperature compressor (1-2) is started; photovoltaic cells in the PVT assembly (3) generate electricity under the irradiation of sunlight, and the electricity is changed into electricity used by a user through an inverter (10).
4. The cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system for defrosting an outdoor heat source according to claim 2, wherein when the cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system for defrosting an outdoor heat source operates in a single-stage compressed air source heating cycle, the first stop valve (7-1), the third stop valve (7-3), the fourth stop valve (7-4) are opened, and the second stop valve (7-2) is closed; the first interface of the first four-way reversing valve (8-1) is communicated with the second interface of the first four-way reversing valve (8-1), and the third interface of the first four-way reversing valve (8-1) is communicated with the fourth interface of the first four-way reversing valve (8-1); the first interface of the second four-way reversing valve (8-2) is communicated with the second interface of the second four-way reversing valve (8-2), and the third interface of the second four-way reversing valve (8-2) is communicated with the fourth interface of the second four-way reversing valve (8-2); the low-temperature compressor (1-1) is stopped, and the high-temperature compressor (1-2) is started; photovoltaic cells in the PVT assembly (3) generate electricity under the irradiation of sunlight, and the electricity is changed into electricity used by a user through an inverter (10).
5. The outdoor heat source defrosting cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system according to claim 2, wherein when the outdoor heat source defrosting cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system is operated in a cascade compression PVT heating cycle, the first stop valve (7-1) is closed, the second stop valve (7-2), the third stop valve (7-3) and the fourth stop valve (7-3) are opened, the first interface of the first four-way reversing valve (8-1) is communicated with the fourth interface of the first four-way reversing valve (8-1), the second interface of the first four-way reversing valve (8-1) is communicated with the third interface of the first four-way reversing valve (8-1), the first interface of the second four-way reversing valve (8-2) is communicated with the second interface of the second four-way reversing valve (8-2), the third interface of the second four-way reversing valve (8-2) is communicated with the fourth interface of the second four-way reversing valve (8-2), and the low-temperature compressor (1-1) and the high-temperature compressor (1-2) are started; photovoltaic cells in the PVT assembly (3) generate electricity under the irradiation of sunlight, and the electricity is changed into electricity used by a user through an inverter (10).
6. The outdoor heat source defrosting cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system according to claim 2, wherein when the outdoor heat source defrosting cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system is operated in a cascade compression air source heating cycle, a first stop valve (7-1) and a fourth stop valve (7-4) are opened, a second stop valve (7-2) and a third stop valve (7-3) are closed, a first interface of the first four-way reversing valve (8-1) is communicated with a fourth interface of the first four-way reversing valve (8-1), a second interface of the first four-way reversing valve (8-1) is communicated with a third interface of the first four-way reversing valve (8-1), a first interface of the second four-way reversing valve (8-2) is communicated with a second interface of the second four-way reversing valve (8-2), a third interface of the second four-way reversing valve (8-2) is communicated with a fourth interface of the second four-way reversing valve (8-2), and both the low-temperature compressor (1-1) and the high-temperature compressor (1-2) are started; photovoltaic cells in the PVT assembly (3) generate electricity under the irradiation of sunlight, and the electricity is changed into electricity used by a user through an inverter (10).
7. The cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system for defrosting an outdoor heat source according to claim 2, wherein when the cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system for defrosting an outdoor heat source operates in a defrosting cycle of an outdoor fin heat exchanger, a first stop valve (7-1) and a second stop valve (7-2) are opened, a third stop valve (7-3) and a fourth stop valve (7-4) are closed, a first interface of the first four-way reversing valve (8-1) is communicated with a second interface of the first four-way reversing valve (8-1), a third interface of the first four-way reversing valve (8-1) is communicated with a fourth interface of the first four-way reversing valve (8-1), a first interface of the second four-way reversing valve (8-2) is communicated with a third interface of the second four-way reversing valve (8-2), and a low-temperature compressor (1-1) is shut down, a second interface of the second four-way reversing valve (8-2) is communicated with a third interface of the second four-way reversing valve (8-2), and the first four-way reversing valve (1-2) is turned on to a maximum opening degree of the high temperature compressor (4); photovoltaic cells in the PVT assembly (3) generate electricity under the irradiation of sunlight, and the electricity is changed into electricity used by a user through an inverter (10).
8. The cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system for defrosting an outdoor heat source according to claim 2, wherein when the cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system for defrosting an outdoor heat source operates in a single-stage compression air source refrigeration cycle, a first stop valve (7-1) and a fourth stop valve (7-4) are opened, a second stop valve (7-2) and a third stop valve (7-3) are closed, a first interface of the first four-way reversing valve (8-1) is communicated with a second interface of the first four-way reversing valve (8-1), a third interface of the first four-way reversing valve (8-1) is communicated with a fourth interface of the first four-way reversing valve (8-1), a first interface of the second four-way reversing valve (8-2) is communicated with a third interface of the second four-way reversing valve (8-2), a low-temperature compressor (1-1) is shut down, and the first four-way reversing valve (8-2) is turned on to a maximum opening degree.
9. The cascade compression multi-cycle PVT-air source multi-on-line heat pump air conditioning system for defrosting an outdoor heat source according to any of claims 1-8, wherein the PVT assembly (3) is of flat box, tube-plate, inflation-plate or flat plate type; the high-temperature compressor (1-2) and the low-temperature compressor (1-1) are any one of a vortex compressor, a rotor compressor, a screw compressor and a piston compressor; the first throttle valve (4-1), the second throttle valve (4-2) and the third throttle valve (4-3) are electronic expansion valves, thermal expansion valves, capillary tubes or orifice plate throttle devices; the first stop valve (7-1), the second stop valve (7-2), the third stop valve (7-3) and the fourth stop valve (7-4) are electromagnetic valves, hand valves or ball valves.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310149329.3A CN116164360A (en) | 2023-02-22 | 2023-02-22 | Overlapping type compression multi-cycle PVT-air source multi-split heat pump air conditioning system for defrosting of outdoor heat source |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310149329.3A CN116164360A (en) | 2023-02-22 | 2023-02-22 | Overlapping type compression multi-cycle PVT-air source multi-split heat pump air conditioning system for defrosting of outdoor heat source |
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| CN116164360A true CN116164360A (en) | 2023-05-26 |
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| CN202310149329.3A Pending CN116164360A (en) | 2023-02-22 | 2023-02-22 | Overlapping type compression multi-cycle PVT-air source multi-split heat pump air conditioning system for defrosting of outdoor heat source |
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| CN (1) | CN116164360A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117053435A (en) * | 2023-08-11 | 2023-11-14 | 浙江国祥股份有限公司 | Magnetic levitation and screw combined type double-cold-source air source heat pump and control method thereof |
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2023
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117053435A (en) * | 2023-08-11 | 2023-11-14 | 浙江国祥股份有限公司 | Magnetic levitation and screw combined type double-cold-source air source heat pump and control method thereof |
| CN117053435B (en) * | 2023-08-11 | 2024-04-09 | 浙江国祥股份有限公司 | Magnetic levitation and screw combined type double-cold-source air source heat pump and control method thereof |
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