CN109945549B - Ultralow-loop-temperature solar-air source heat pump unit externally connected with sustainable heat source - Google Patents
Ultralow-loop-temperature solar-air source heat pump unit externally connected with sustainable heat source Download PDFInfo
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- CN109945549B CN109945549B CN201910208679.6A CN201910208679A CN109945549B CN 109945549 B CN109945549 B CN 109945549B CN 201910208679 A CN201910208679 A CN 201910208679A CN 109945549 B CN109945549 B CN 109945549B
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Abstract
The invention discloses an ultra-low loop temperature solar-air source heat pump unit externally connected with a sustainable heat source, which comprises a quasi-two-stage (two-stage) compressor, a four-way reversing valve, an indoor heat exchanger, a main path economizer, a main path electronic expansion valve, an outdoor heat exchanger, a gas-liquid separator, an auxiliary path electronic expansion valve, a water-cooling evaporator, a low-temperature solar heat collector, a water pump, a first one-way valve, a capillary tube, a second one-way valve, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve, a fifth electromagnetic valve, a sixth electromagnetic valve, a seventh electromagnetic valve, a main loop (heating/refrigerating operation), a defrosting loop, a gas supplementing loop and a sustainable heat source loop. On one hand, under the air supplement working condition, the unit can utilize hot water produced by the solar thermal collector to heat and gasify the refrigerant in the air supplement loop. On the other hand, under the defrosting working condition, the four-way reversing valve of the unit does not reverse, and hot water produced by solar energy is utilized for defrosting when the indoor continuous heat supply is carried out.
Description
Technical Field
The invention relates to an intermediate air supply type quasi-two-stage (two-stage) compressed air source heat pump system, in particular to an ultralow ring temperature solar-air source heat pump unit with an external sustainable heat source utilized for intermediate air supply.
Background
The intermediate air supplement form of the existing intermediate air supplement type quasi-two-stage (two-stage) compressed air source heat pump system mainly comprises an over-cooling type with an economizer and a flash evaporation type with a flash evaporator, wherein refrigerant steam for air supplement is generated by further heating high-temperature/pressure liquid refrigerant at the outlet of a condenser, and the refrigerant steam for air supplement is generated by gas-liquid phase separation after first-stage throttling. The heat consumed by both forms of air supplementation comes from the system itself. In addition, the defrosting mode of the middle air supply type quasi-two-stage (two-stage) compressed air source heat pump system mostly adopts reverse circulation defrosting and hot gas bypass defrosting, the system cannot continuously supply heat, partial heat required by heating is wasted to a certain extent, so that the seasonal performance coefficient of heat supply is reduced, and the economical efficiency of the middle air supply type air source heat pump heating is weakened.
Disclosure of Invention
In order to solve the problems of the conventional intermediate air supply type quasi-two-stage (two-stage) compressed air source heat pump system, the invention provides an ultralow-loop-temperature solar-air source heat pump unit which utilizes an external sustainable heat source for intermediate air supply. On one hand, under the air supplement working condition, the unit can utilize hot water produced by the solar thermal collector to heat and gasify the refrigerant in the air supplement loop. At the moment, the heat absorbed by the system from the outside is equal to the sum of the heat absorbed by the evaporator from the environment and the heat absorbed by the air supply from the solar hot water, and when the working state of the compressor is unchanged, the heating capacity of the unit can be theoretically improved by 32 percent or even higher. On the other hand, under the defrosting working condition, the four-way reversing valve of the unit does not reverse, and hot water produced by solar energy is utilized for defrosting when the indoor continuous heat supply is carried out. At the moment, the sustainable heating requirement of the unit in a low-temperature environment can be ensured, so that the heating performance coefficient of the unit is improved.
The purpose of the invention is realized by the following technical scheme:
the utility model provides an ultralow ring temperature solar energy-air source heat pump set of external sustainable heat source, including quasi two-stage (doublestage) compressor, four-way reversing valve, indoor heat exchanger, economic ware, main way electronic expansion valve, outdoor heat exchanger, vapour and liquid separator, auxiliary way electronic expansion valve, water-cooling evaporimeter, low temperature solar collector, water pump, first check valve, capillary, second check valve, first solenoid valve, second solenoid valve, third solenoid valve, fourth solenoid valve, fifth solenoid valve, sixth solenoid valve, seventh solenoid valve, main loop, defrosting loop, tonifying qi loop and sustainable heat source loop, wherein:
a first electromagnetic valve and a second electromagnetic valve are arranged on the main loop;
a first electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve, a seventh electromagnetic valve and a first one-way valve are arranged on the defrosting loop;
a fourth electromagnetic valve, a fifth electromagnetic valve, a sixth electromagnetic valve and a second one-way valve are arranged on the air supplementing loop;
the air supplement pipeline is connected with an air supplement port of the quasi-second-stage (double-stage) compressor;
the exhaust port of the quasi-two-stage (two-stage) compressor is connected with the outlet a of the four-way reversing valve;
the outlet b of the four-way reversing valve is connected with a tee joint A, one end of the tee joint A is connected with the indoor heat exchanger through a first electromagnetic valve, and the other end of the tee joint A is connected with the outdoor heat exchanger through a third electromagnetic valve and a tee joint C;
the outlet c of the four-way reversing valve is connected with an air suction port of the compressor through a gas-liquid separator;
the outlet d of the four-way reversing valve is connected with a tee joint B, one end of the tee joint B is connected with the outdoor heat exchanger through a second electromagnetic valve and a tee joint C, and the other end of the tee joint B is connected with a tee joint G through a seventh electromagnetic valve;
the indoor heat exchanger is positioned on the main loop/defrosting loop, the inlet of the indoor heat exchanger is connected with the outlet b of the four-way reversing valve through a first electromagnetic valve and a tee joint A, the outlet of the indoor heat exchanger is connected with a tee joint D, one end of the tee joint D is connected with an economizer positioned on the main loop, and the other end of the tee joint D is connected with the water-cooling evaporator through an auxiliary electronic expansion valve, a tee joint E, a fourth electromagnetic valve and a tee joint F;
the economizer is positioned on the main loop/air supplement loop, the inlet of the main loop of the economizer is connected with a tee D, one end of the tee D is connected with the indoor heat exchanger positioned on the main loop, and the other end of the tee D is connected with the water-cooling evaporator through an auxiliary electronic expansion valve, a tee E, a fourth electromagnetic valve and a tee F; the outlet of the main loop of the economizer is connected with the outdoor heat exchanger through a main electronic expansion valve and a tee joint I; an inlet of the gas supplementing loop of the economizer is connected with a tee joint E through a fifth electromagnetic valve; an outlet of an air supply loop of the economizer is connected with a tee joint H through a second one-way valve, one end of the tee joint H is connected with an air supply port of the quasi-secondary (two-stage) compressor through a sixth electromagnetic valve, and the other end of the tee joint H is respectively connected with a seventh electromagnetic valve and the water-cooled evaporator through a tee joint G;
the main circuit electronic expansion valve is positioned on the main loop, the inlet of the main circuit electronic expansion valve is connected with the economizer on the main loop, the outlet of the main circuit electronic expansion valve is connected with a tee joint I, one end of the tee joint I is connected with the outdoor heat exchanger on the main loop, and the other end of the tee joint I is connected with the capillary tube through a first one-way valve;
the outdoor heat exchanger is positioned on the main loop/defrosting loop, and two ends of the outdoor heat exchanger are respectively connected with a tee joint C and a tee joint I, wherein one end of the tee joint C is connected with an outlet d of the four-way reversing valve through a second electromagnetic valve and a tee joint B, and the other end of the tee joint C is connected with an outlet B of the four-way reversing valve through a third electromagnetic valve and a tee joint A; one end of the tee joint I is connected with the economizer through the main-path electronic expansion valve, and the other end of the tee joint I is connected with the capillary tube through the first one-way valve;
the capillary tube is positioned on the defrosting loop, and the inlet of the capillary tube is connected with the outlet of the first one-way valve; the outlet of the capillary tube is connected with a tee F, one end of the tee F is connected with the inlet of the water-cooling evaporator, and the other end of the tee F is connected with a fourth electromagnetic valve;
the auxiliary electronic expansion valve is positioned on the air supply loop, the inlet of the auxiliary electronic expansion valve is connected with a tee joint D, one end of the tee joint D is connected with the outlet of the indoor heat exchanger, and the other end of the tee joint D is connected with the inlet of the main loop of the economizer; the outlet of the three-way valve E is connected with a three-way valve E, one end of the three-way valve E is connected with a fourth electromagnetic valve, and the other end of the three-way valve E is connected with the gas supplementing inlet of the economizer through a fifth electromagnetic valve;
the water-cooled evaporator is positioned on the air supply loop/defrosting loop/sustainable heat source loop, the inlet of the air supply loop/defrosting loop of the water-cooled evaporator is connected with a tee F, one end of the tee F is connected with a fourth electromagnetic valve, and the other end of the tee F is connected with a capillary tube; the outlet of the water-cooled evaporator, which is positioned on the air supply loop/defrosting loop, is connected with a tee G, one end of the tee G is connected with a sixth electromagnetic valve through a tee H, and the other end of the tee G is connected with a seventh electromagnetic valve; the water-cooled evaporator is positioned at the inlet of the sustainable heat source loop and is connected with the low-temperature solar heat collector; the water-cooled evaporator is positioned at the outlet of the sustainable heat source and is connected with the water pump;
the low-temperature solar heat collector is positioned on the sustainable heat source loop, one end of the low-temperature solar heat collector is connected with an inlet of the water-cooled evaporator positioned on the sustainable heat source loop, and the other end of the low-temperature solar heat collector is connected with the water pump;
the water pump is positioned on the sustainable heat source loop, one end of the water pump is connected with an outlet of the water-cooled evaporator positioned on the sustainable heat source loop, and the other end of the water pump is connected with the low-temperature solar heat collector.
Compared with the prior art, the invention has the following advantages:
1. the ultra-low ring temperature solar-air source heat pump unit with the externally-connected sustainable heat source for middle air supplement can be used in winter and summer, three working modes can be freely switched during heating in winter, the unit can efficiently run in most of time, and the energy efficiency coefficient of the unit in the heating season can be improved.
2. When the intermediate air supplement utilizes the air supplement working condition of the ultralow-ring-temperature solar-air source heat pump unit externally connected with a sustainable heat source, the auxiliary air supplement not only can independently utilize the heat of hot water prepared by the solar heat collector to heat the gasification compressor for air supplement so as to improve the heating capacity of the unit, but also can combine the unit with an economizer to gasify the auxiliary refrigerant so as to meet the heat load requirement of a room at ultralow environmental temperature.
3. The intermediate air supplement system can realize indoor continuous heat supply and defrosting operation by utilizing the heat of hot water prepared by the solar heat collector under the defrosting mode of the ultralow-loop-temperature solar-air source heat pump unit externally connected with the sustainable heat source.
Drawings
FIG. 1 is a schematic structural diagram of an ultra-low loop temperature solar-air source heat pump unit utilizing external sustainable heat source for intermediate air supplement according to the present invention, wherein: 1-quasi-two stage (two stage) compressor; a 2-four-way reversing valve; 3-indoor heat exchanger; 4-an economizer; 5-main path electronic expansion valve; 6-outdoor heat exchanger; 7-gas-liquid separator; 8-auxiliary electronic expansion valve; 9-water-cooled evaporator; 10-low temperature solar thermal collector; 11-a water pump; 12-a first one-way valve; 13-a capillary tube; 14-a second one-way valve; EV1 — first solenoid valve; EV 2-second solenoid valve; EV 3-third solenoid valve; EV 4-fourth solenoid valve; EV 5-fifth solenoid valve; EV 6-sixth solenoid valve; EV 7-seventh solenoid valve.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings, but not limited thereto, and any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention shall be covered by the protection scope of the present invention.
The invention provides an ultralow-loop-temperature solar-air source heat pump unit with intermediate air supplement and external sustainable heat source, as shown in fig. 1, the unit comprises a quasi-two-stage (two-stage) compressor 1, a four-way reversing valve 2, an indoor heat exchanger 3, an economizer 4, a main electronic expansion valve 5, an outdoor heat exchanger 6, an air-liquid separator 7, an auxiliary electronic expansion valve 8, a water-cooling evaporator 9, a low-temperature solar heat collector 10, a water pump 11, a first one-way valve 12, a capillary tube 13, a second one-way valve 14, a first electromagnetic valve EV1, a second electromagnetic valve EV2, a third electromagnetic valve EV3, a fourth electromagnetic valve EV4, a fifth electromagnetic valve EV5, a sixth electromagnetic valve EV6, a seventh electromagnetic valve EV7, a main loop (heating/cooling operation), a defrosting loop, an air supplement loop and a sustainable heat source loop, wherein:
a first electromagnetic valve EV1 and a second electromagnetic valve EV2 are arranged on the main loop;
a first electromagnetic valve EV1, a third electromagnetic valve EV3, a fourth electromagnetic valve EV4, a seventh electromagnetic valve EV7 and a first one-way valve 12 are arranged on the defrosting loop;
a fourth electromagnetic valve EV4, a fifth electromagnetic valve EV5, a sixth electromagnetic valve EV6 and a second one-way valve 14 are arranged on the air supplementing loop;
the air supplement pipeline is connected with an air supplement port of the quasi-two-stage (two-stage) compressor 1;
the exhaust port of the quasi-two-stage (two-stage) compressor 1 is connected with the outlet a of the four-way reversing valve 2;
the outlet b of the four-way reversing valve 2 is connected with a tee joint A, one end of the tee joint A is connected with the indoor heat exchanger 3 through a first electromagnetic valve EV1, and the other end of the tee joint A is connected with the outdoor heat exchanger 6 through a third electromagnetic valve EV3 and a tee joint C;
the outlet c of the four-way reversing valve 2 is connected with the air suction port of the compressor 1 through a gas-liquid separator 7;
the outlet d of the four-way reversing valve 2 is connected with a tee joint B, one end of the tee joint B is connected with the outdoor heat exchanger 6 through a second electromagnetic valve EV2 and a tee joint C, and the other end of the tee joint B is connected with a tee joint G through a seventh electromagnetic valve EV 7;
the indoor heat exchanger 3 is positioned on a main loop/defrosting loop, the inlet of the indoor heat exchanger is connected with the outlet b of the four-way reversing valve 2 through a first electromagnetic valve EV1 and a tee joint A, the outlet of the indoor heat exchanger is connected with a tee joint D, one end of the tee joint D is connected with an economizer positioned on the main loop, and the other end of the tee joint D is connected with a water-cooling evaporator 9 through an auxiliary electronic expansion valve 8, a tee joint E, a fourth electromagnetic valve EV4 and a tee joint F;
the economizer 4 is positioned on the main loop/air supplement loop, the inlet of the main loop of the economizer 4 is connected with a tee joint D, one end of the tee joint D is connected with the indoor heat exchanger 3 positioned on the main loop, and the other end of the tee joint D is connected with the water-cooling evaporator 9 through an auxiliary electronic expansion valve 8, a tee joint E, a fourth electromagnetic valve EV4 and a tee joint F; the outlet of the main loop of the economizer 4 is connected with an outdoor heat exchanger 6 through a main electronic expansion valve 5 and a tee joint I; the inlet of the gas supplementing loop of the economizer 4 is connected with a tee E through a fifth electromagnetic valve EV 5; the outlet of the air supply loop of the economizer 4 is connected with a tee joint H through a second one-way valve 14, one end of the tee joint H is connected with an air supply port of the quasi-two-stage (two-stage) compressor 1 through a sixth electromagnetic valve EV6, and the other end of the tee joint H is respectively connected with a seventh electromagnetic valve EV7 and a water-cooled evaporator 9 through a tee joint G;
the main circuit electronic expansion valve 5 is positioned on the main loop, the inlet of the main circuit electronic expansion valve is connected with the economizer 4 on the main loop, the outlet of the main circuit electronic expansion valve is connected with a tee joint I, one end of the tee joint I is connected with the outdoor heat exchanger 6 on the main loop, and the other end of the tee joint I is connected with the capillary tube 13 through the first one-way valve 12;
the outdoor heat exchanger 6 is positioned on the main loop/defrosting loop, and two ends of the outdoor heat exchanger are respectively connected with a tee joint C and a tee joint I, wherein one end of the tee joint C is connected with an outlet d of the four-way reversing valve 2 through a second electromagnetic valve EV2 and a tee joint B, and the other end of the tee joint C is connected with an outlet B of the four-way reversing valve 2 through a third electromagnetic valve EV3 and a tee joint A; one end of the tee joint I is connected with the economizer 4 through the main-path electronic expansion valve 5, and the other end of the tee joint I is connected with the capillary 13 through the first one-way valve 12;
the capillary tube 13 is positioned on the defrosting loop, and the inlet of the capillary tube is connected with the outlet of the first one-way valve 12; the outlet of the capillary tube is connected with a tee F, one end of the tee F is connected with the inlet of the water-cooled evaporator 9, and the other end of the tee F is connected with a fourth electromagnetic valve EV 4;
the auxiliary electronic expansion valve 8 is positioned on the air supply loop, the inlet of the auxiliary electronic expansion valve is connected with a tee joint D, one end of the tee joint D is connected with the outlet of the indoor heat exchanger 3, and the other end of the tee joint D is connected with the main loop inlet of the economizer 4; the outlet of the three-way valve E is connected with a third electromagnetic valve EV4, one end of the third electromagnetic valve EV4 is connected with the other end of the third electromagnetic valve E through a fifth electromagnetic valve EV5 and is connected with the gas supplementing inlet of the economizer 4;
the water-cooled evaporator 9 is positioned on the air supply loop/defrosting loop/sustainable heat source loop, the inlet of the water-cooled evaporator 9 positioned on the air supply loop/defrosting loop is connected with a tee F, one end of the tee F is connected with a fourth electromagnetic valve EV4, and the other end of the tee F is connected with a capillary tube 13; the water-cooled evaporator 9 is positioned at the outlet of the air supply loop/defrosting loop and is connected with a tee joint G, one end of the tee joint G is connected with a sixth electromagnetic valve EV6 through a tee joint H, and the other end of the tee joint G is connected with a seventh electromagnetic valve EV 7; the water-cooled evaporator 9 is positioned at the inlet of the sustainable heat source loop and is connected with the low-temperature solar heat collector 10; the water-cooled evaporator 9 is positioned at the outlet of the sustainable heat source and is connected with a water pump 11;
the low-temperature solar heat collector 10 is positioned on the sustainable heat source loop, one end of the low-temperature solar heat collector is connected with an inlet of the water-cooled evaporator 9 positioned on the sustainable heat source loop, and the other end of the low-temperature solar heat collector is connected with the water pump 11;
the water pump is positioned on the sustainable heat source loop, one end of the water pump is connected with an outlet of the water-cooled evaporator 9 positioned on the sustainable heat source loop, and the other end of the water pump is connected with the low-temperature solar heat collector 10.
In the invention, a tee joint A connected with an outlet of the four-way reversing valve b is positioned between a first electromagnetic valve EV1 and a third electromagnetic valve EV3, and is a first design factor for realizing switching between a main loop and a defrosting loop.
In the invention, a tee joint B connected with an outlet d of the four-way reversing valve 2 is positioned between the second electromagnetic valve EV2 and the seventh electromagnetic valve EV7, and is a second design element for realizing switching between the main loop and the defrosting loop.
In the invention, two ends of the outdoor heat exchanger 6 are respectively connected with a tee joint C and a tee joint I, wherein the tee joint C is positioned between a second electromagnetic valve EV2 and a third electromagnetic valve EV3 and is a third design element for realizing switching between a main loop and a defrosting loop; the tee joint I is located between the main circuit electronic expansion valve 5 and the first check valve 12, and is a fourth design element for realizing switching between the main circuit and the defrost circuit.
In the invention, the inlet of the auxiliary electronic expansion valve 8 is connected with a tee joint D, and the tee joint D is positioned between the indoor heat exchanger 3 and the economizer 4 and is a design factor for realizing the parallelism of a main loop and a gas supplementing loop; the outlet of the auxiliary electronic expansion valve 8 is connected with a tee joint E, and the tee joint E is positioned between the fourth electromagnetic valve EV4 and the fifth electromagnetic valve EV5, and is a design element for realizing the parallel of two air replenishing loops.
In the present invention, the water-cooled evaporator 9 is located on the air make-up loop/defrost loop. When the air supplement working condition is adopted, the air supplement device absorbs the heat collected by the low-temperature solar heat collector, so that the refrigerant is gasified and enters an air supplement port of a quasi-two-stage (two-stage) compressor, and the air supplement device has the function of improving the heating capacity of a system; when in defrosting condition, the heat-collecting device absorbs the heat collected by the low-temperature solar heat collector, so that the refrigerant is gasified and enters the air suction port of the quasi-two-stage (two-stage) compressor, the function of the air suction port is equivalent to that of an evaporator, and the indoor normal heat supply can be ensured.
The ultra-low ring temperature solar-air source heat pump unit with the external sustainable heat source for intermediate air supplement can heat in winter and refrigerate in summer, the heating operation has three working modes, the refrigeration operation is the same as that of a conventional unit, and the specific working flow is as follows:
heating operation:
(1) normal temperature working condition (> 0 ℃ C.)
During normal heating operation, the compressor auxiliary intake air is closed, that is, the fourth solenoid valve EV4, the fifth solenoid valve EV5, and the sixth solenoid valve EV6 are all closed, and the third solenoid valve EV3 and the seventh solenoid valve EV7 are closed. High-temperature and high-pressure refrigerant steam is discharged from an exhaust port of the quasi-two-stage (two-stage) compressor 1, flows through a first electromagnetic valve EV1 through an a-b outlet of the four-way reversing valve 2 and enters the indoor heat exchanger 3, condensed liquid refrigerant flows through a main path economizer 4 (the economizer does not work at this time) and enters a main path electronic expansion valve 5, the throttled refrigerant (two phases) absorbs heat of low-temperature air in the outdoor heat exchanger 6 and is converted into refrigerant steam, and the refrigerant steam sequentially flows through a second electromagnetic valve EV2 and a d-c outlet of the four-way reversing valve 2 and returns to an air suction port of the quasi-two-stage (two-stage) compressor 1 through a gas-liquid separator; thus constituting one cycle.
In the defrost mode, the compressor auxiliary intake is closed, i.e., both the fifth solenoid valve EV5 and the sixth solenoid valve EV6 are closed, while the second solenoid valve EV2 is closed. High-temperature and high-pressure refrigerant steam is discharged from an exhaust port of the quasi-two-stage (two-stage) compressor 1, is divided into two paths through an a-b outlet of the four-way reversing valve 2, one path of the refrigerant steam enters the outdoor heat exchanger 6 for defrosting through a third electromagnetic valve EV3, the other path of the refrigerant steam enters the indoor heat exchanger 3 through an electromagnetic valve EV1 for continuously supplying heat to the indoor, condensed liquid refrigerant enters the auxiliary electronic expansion valve 8 and is mixed with the refrigerant flowing through the outdoor heat exchanger 6, the one-way valve 12 and the capillary tube 13 successively through a fourth electromagnetic valve EV4, the refrigerant steam is gasified into the refrigerant steam after flowing through the water-cooled evaporator 9 which generates hot water and flows through the solar heat collector 10, then flows through a seventh electromagnetic valve EV7 and a d-c outlet of the four-way reversing valve 2 and returns to; thus, indoor continuous heat supply and defrosting circulation is formed under the normal temperature working condition.
(2) Low-temperature working condition (-15-0 ℃ C.)
During normal heating operation, the auxiliary intake air of the compressor is opened, at this time, the first solenoid valve EV1, the second solenoid valve EV2, the fourth solenoid valve EV4 and the sixth solenoid valve EV6 are all opened, and the third solenoid valve EV3, the fifth solenoid valve EV5 and the seventh solenoid valve EV7 are closed. High-temperature and high-pressure refrigerant steam is discharged from an exhaust port of the quasi-two-stage (two-stage) compressor 1, flows through a first electromagnetic valve EV1 through an a-b outlet of a four-way reversing valve 2 and enters an indoor heat exchanger 3, the condensed liquid refrigerant is divided into two paths, a main path liquid refrigerant enters a main path electronic expansion valve 5 through a main path economizer 4 (the economizer does not work at the moment), the throttled refrigerant (two phases) absorbs heat of low-temperature air in an outdoor heat exchanger 6 and is converted into refrigerant steam, and the refrigerant steam sequentially flows through a second electromagnetic valve EV2 and a d-c outlet of the four-way reversing valve 2, passes through a gas-liquid separator 7 and returns to an air suction port of the quasi-two-stage (two-stage; after throttling by an auxiliary electronic expansion valve 8, an auxiliary liquid refrigerant enters a water-cooled evaporator 9 to absorb heat from a solar heat collector 10 for preparing hot water, the heat is gasified to an overheated state, overheated refrigerant steam directly returns to the quasi-second-stage (two-stage) compressor 1 through a sixth electromagnetic valve 6 and an auxiliary air inlet, the motor is cooled firstly and is mixed with exhaust gas of first-stage compression, and the mixed refrigerant is compressed again and then is discharged out of the quasi-second-stage (two-stage) compressor 1; thus constituting one cycle. In addition, the defrosting mode is the same as the running mode without air supplement under the normal temperature working condition.
(3) Ultra-low temperature working condition (less than or equal to-15℃)
During normal heating operation, the auxiliary intake air of the compressor is opened, and at this time, the first solenoid valve EV1, the second solenoid valve EV2, the fourth solenoid valve EV4, the fifth solenoid valve EV5 and the sixth solenoid valve EV6 are all opened, and the third solenoid valve EV3 and the seventh solenoid valve EV7 are closed. High-temperature and high-pressure refrigerant steam is discharged from an exhaust port of a quasi-two-stage (two-stage) compressor 1, flows through a first electromagnetic valve EV1 through a-b outlet of a four-way reversing valve 2 and enters an indoor heat exchanger 3, condensed liquid refrigerant is divided into two paths, the refrigerant of an auxiliary loop is throttled by an electronic expansion valve 8, one part of the refrigerant sequentially passes through a fourth electromagnetic valve EV4 and a water-cooled evaporator 9 to absorb heat to be in an overheated state, the other part of the refrigerant enters a main economizer 4 to absorb heat to be in an overheated state through a fifth electromagnetic valve EV5, and the superheated refrigerant steam of the two auxiliary paths is mixed at the outlet of the water-; the refrigerant of the main loop flows through the main economizer 4 and then is further subcooled, flows into the outdoor heat exchanger 6 after being throttled by the main electronic expansion valve 5, flows through the second electromagnetic valve EV2 and the d-c outlet of the four-way reversing valve 2 after absorbing heat and changing phase, passes through the gas-liquid separator 7 and returns to the air suction port of the quasi-two-stage (two-stage) compressor 1 to complete one-stage compression; the mixed superheated refrigerant vapor directly returns to the quasi-two-stage (two-stage) compressor through the sixth electromagnetic valve 6 and the auxiliary air inlet, firstly cools the motor, is mixed with the exhaust gas of the first-stage compression, and is discharged out of the quasi-two-stage (two-stage) compressor 1 after the mixed refrigerant is compressed again; thus constituting one cycle. Under the ultralow temperature working condition, the unit has almost no possibility of frosting, so that the unit has no defrosting operation mode.
(II) refrigeration operation
During the cooling operation, the auxiliary air inlet of the compressor is closed, the first electromagnetic valve EV1 and the second electromagnetic valve EV2 are opened at the moment, and the other electromagnetic valves are closed. High-temperature and high-pressure refrigerant steam is discharged from an exhaust port of a quasi-two-stage (two-stage) compressor 1, flows through a second electromagnetic valve EV2 through an a-d outlet of a four-way reversing valve 2 and enters an outdoor heat exchanger 6, condensed liquid refrigerant flows through a main electronic expansion valve 5 and enters a main economizer 4 (the economizer does not work at the moment), the throttled refrigerant (two phases) absorbs heat of indoor air in an indoor heat exchanger 3 and is converted into refrigerant steam, and the refrigerant steam successively flows through a first electromagnetic valve EV1 and b-c outlets of the four-way reversing valve 2 and returns to an air suction port of the quasi-two-stage (two-stage) compressor through a gas-liquid separator 7 to complete compression; thus constituting one cycle.
Claims (1)
1. The utility model provides an ultra-low ring temperature solar-air source heat pump unit of external sustainable heat source, its characterized in that the unit includes quasi-second grade or doublestage compressor, four-way reversing valve, indoor heat exchanger, economic ware, main way electronic expansion valve, outdoor heat exchanger, vapour and liquid separator, auxiliary way electronic expansion valve, water-cooling evaporimeter, low temperature solar collector, water pump, first check valve, capillary, second check valve, first solenoid valve, second solenoid valve, third solenoid valve, fourth solenoid valve, fifth solenoid valve, sixth solenoid valve, seventh solenoid valve, main loop, defrosting loop, tonifying qi loop and sustainable heat source loop, wherein:
a first electromagnetic valve and a second electromagnetic valve are arranged on the main loop;
a first electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve, a seventh electromagnetic valve and a first one-way valve are arranged on the defrosting loop;
a fourth electromagnetic valve, a fifth electromagnetic valve, a sixth electromagnetic valve and a second one-way valve are arranged on the air supplementing loop;
the air supplement pipeline is connected with an air supplement port of the quasi-second-stage or two-stage compressor;
the exhaust port of the quasi-two-stage or two-stage compressor is connected with the outlet a of the four-way reversing valve;
the outlet b of the four-way reversing valve is connected with a tee joint A, one end of the tee joint A is connected with the indoor heat exchanger through a first electromagnetic valve, and the other end of the tee joint A is connected with the outdoor heat exchanger through a third electromagnetic valve and a tee joint C;
the outlet c of the four-way reversing valve is connected with an air suction port of the compressor through a gas-liquid separator;
the outlet d of the four-way reversing valve is connected with a tee joint B, one end of the tee joint B is connected with the outdoor heat exchanger through a second electromagnetic valve and a tee joint C, and the other end of the tee joint B is connected with a tee joint G through a seventh electromagnetic valve;
the indoor heat exchanger is positioned on the main loop/defrosting loop, the inlet of the indoor heat exchanger is connected with the outlet b of the four-way reversing valve through a first electromagnetic valve and a tee joint A, the outlet of the indoor heat exchanger is connected with a tee joint D, one end of the tee joint D is connected with an economizer positioned on the main loop, and the other end of the tee joint D is connected with the water-cooling evaporator through an auxiliary electronic expansion valve, a tee joint E, a fourth electromagnetic valve and a tee joint F;
the economizer is positioned on the main loop/air supplement loop, the inlet of the main loop of the economizer is connected with a tee joint D, and the outlet of the main loop of the economizer is connected with the outdoor heat exchanger through a main electronic expansion valve and a tee joint I; an inlet of the gas supplementing loop of the economizer is connected with a tee joint E through a fifth electromagnetic valve; an outlet of an air supply loop of the economizer is connected with a tee joint H through a second one-way valve, one end of the tee joint H is connected with an air supply port of the quasi-second-stage or two-stage compressor through a sixth electromagnetic valve, and the other end of the tee joint H is respectively connected with a seventh electromagnetic valve and the water-cooled evaporator through a tee joint G;
the main circuit electronic expansion valve is positioned on the main loop, the inlet of the main circuit electronic expansion valve is connected with the economizer on the main loop, the outlet of the main circuit electronic expansion valve is connected with a tee joint I, one end of the tee joint I is connected with the outdoor heat exchanger on the main loop, and the other end of the tee joint I is connected with the capillary tube through a first one-way valve;
the outdoor heat exchanger is positioned on the main loop/defrosting loop, and two ends of the outdoor heat exchanger are respectively connected with a tee joint C and a tee joint I, wherein one end of the tee joint C is connected with an outlet d of the four-way reversing valve through a second electromagnetic valve and a tee joint B, and the other end of the tee joint C is connected with an outlet B of the four-way reversing valve through a third electromagnetic valve and a tee joint A;
the capillary tube is positioned on the defrosting loop, and the inlet of the capillary tube is connected with the outlet of the first one-way valve; the outlet of the capillary tube is connected with a tee F, one end of the tee F is connected with the inlet of the water-cooling evaporator, and the other end of the tee F is connected with a fourth electromagnetic valve;
the auxiliary electronic expansion valve is positioned on the air replenishing loop, the inlet of the auxiliary electronic expansion valve is connected with a tee joint D, the outlet of the auxiliary electronic expansion valve is connected with a tee joint E, one end of the tee joint E is connected with a fourth electromagnetic valve, and the other end of the tee joint E is connected with the air replenishing inlet of the economizer through a fifth electromagnetic valve;
the water-cooled evaporator is positioned on the air supply loop/defrosting loop/sustainable heat source loop, the inlet of the water-cooled evaporator positioned on the air supply loop/defrosting loop is connected with a tee joint F, the outlet of the water-cooled evaporator positioned on the air supply loop/defrosting loop is connected with a tee joint G, one end of the tee joint G is connected with a sixth electromagnetic valve through a tee joint H, and the other end of the tee joint G is connected with a seventh electromagnetic valve; the water-cooled evaporator is positioned at the inlet of the sustainable heat source loop and is connected with the low-temperature solar heat collector; the water-cooled evaporator is positioned at the outlet of the sustainable heat source and is connected with the water pump;
the low-temperature solar heat collector is positioned on the sustainable heat source loop, one end of the low-temperature solar heat collector is connected with an inlet of the water-cooled evaporator positioned on the sustainable heat source loop, and the other end of the low-temperature solar heat collector is connected with the water pump;
the water pump is positioned on the sustainable heat source loop, one end of the water pump is connected with an outlet of the water-cooled evaporator positioned on the sustainable heat source loop, and the other end of the water pump is connected with the low-temperature solar heat collector;
the working process of the unit is as follows:
(1) normal temperature working condition
When the compressor is in normal heating operation, auxiliary air inlet of the compressor is closed, namely the fourth electromagnetic valve, the fifth electromagnetic valve and the sixth electromagnetic valve are all closed, at the moment, the third electromagnetic valve and the seventh electromagnetic valve are closed, high-temperature and high-pressure refrigerant steam is discharged from an exhaust port of the quasi-two-stage or two-stage compressor, flows through the first electromagnetic valve through an a-b outlet of the four-way reversing valve and enters the indoor heat exchanger, condensed liquid refrigerant flows through the main economizer and enters the main electronic expansion valve, the throttled refrigerant absorbs heat of low-temperature air in the outdoor heat exchanger and is converted into refrigerant steam, and the refrigerant steam flows through the second electromagnetic valve and a d-c outlet of the four-way reversing valve successively and returns to an air suction port of the quasi-two; thus forming a cycle;
in the defrosting mode, the auxiliary air inlet of the compressor is closed, namely the fifth electromagnetic valve and the sixth electromagnetic valve are both closed, the second electromagnetic valve is closed at the moment, high-temperature and high-pressure refrigerant steam is discharged from an exhaust port of the quasi-two-stage or two-stage compressor and is divided into two paths through an a-b outlet of the four-way reversing valve, one path of the refrigerant steam enters the outdoor heat exchanger through the third electromagnetic valve for defrosting, the other path of the refrigerant steam enters the indoor heat exchanger through the first electromagnetic valve for supplying heat to the indoor continuously, the condensed liquid refrigerant enters the auxiliary electronic expansion valve and is mixed with the refrigerant which sequentially flows through the outdoor heat exchanger, the first one-way valve and the capillary tube through the fourth electromagnetic valve, the refrigerant steam is heated, then flows through a d-c outlet of a seventh electromagnetic valve and a four-way reversing valve, and returns to an air suction port of a quasi-two-stage or two-stage compressor through a gas-liquid separator to complete compression; thus, indoor continuous heat supply and defrosting circulation under the normal temperature working condition is formed;
(2) low temperature operating mode
When the compressor is in normal heating operation, auxiliary air inlet of the compressor is opened, at the moment, the first electromagnetic valve, the second electromagnetic valve, the fourth electromagnetic valve and the sixth electromagnetic valve are all opened, the third electromagnetic valve, the fifth electromagnetic valve and the seventh electromagnetic valve are closed, high-temperature and high-pressure refrigerant steam is discharged from an air outlet of the quasi-two-stage or two-stage compressor, flows through the first electromagnetic valve through an a-b outlet of the four-way reversing valve and enters the indoor heat exchanger, the condensed liquid refrigerant is divided into two paths, the main path liquid refrigerant enters the main path electronic expansion valve through the main path economizer, the throttled refrigerant absorbs heat of low-temperature air in the outdoor heat exchanger and is converted into refrigerant steam, and the refrigerant steam sequentially flows through d-c outlets of the second electromagnetic valve and the four-way reversing valve, passes through the gas-liquid separator; the auxiliary circuit liquid refrigerant enters the water-cooled evaporator to absorb heat from the solar heat collector to prepare hot water after being throttled by the auxiliary circuit electronic expansion valve, the heat is gasified to an overheated state, overheated refrigerant steam directly returns to the quasi-second-stage or two-stage compressor through a sixth electromagnetic valve and an auxiliary air inlet, the motor is cooled firstly and is mixed with exhaust gas of the first-stage compression, and the mixed refrigerant is compressed again and then is discharged out of the quasi-second-stage or two-stage compressor; thus forming a cycle;
(3) ultra-low temperature working condition
When the compressor is in normal heating operation, auxiliary air inlet of the compressor is opened, at the moment, a first electromagnetic valve, a second electromagnetic valve, a fourth electromagnetic valve, a fifth electromagnetic valve and a sixth electromagnetic valve are all opened, a third electromagnetic valve and a seventh electromagnetic valve are closed, high-temperature and high-pressure refrigerant steam is discharged from an exhaust port of the quasi-two-stage or two-stage compressor, flows through a first electromagnetic valve through an a-b outlet of a four-way reversing valve and enters an indoor heat exchanger, condensed liquid refrigerant is divided into two paths, after the refrigerant of an auxiliary loop is throttled by an electronic expansion valve, one part of the refrigerant sequentially absorbs heat through the fourth electromagnetic valve and a water-cooled evaporator to an overheated state, the other part of the refrigerant enters a main path economizer to absorb heat through the fifth electromagnetic valve to an overheated state; the refrigerant of the main loop flows through the main path economizer and then is further subcooled, enters the outdoor heat exchanger after being throttled by the main path electronic expansion valve, flows through the second electromagnetic valve and the d-c outlet of the four-way reversing valve after absorbing heat and changing phase, passes through the gas-liquid separator and returns to the air suction port of the quasi-two-stage or two-stage compressor to complete first-stage compression; the mixed superheated refrigerant vapor directly returns to the quasi-two-stage or two-stage compressor through a sixth electromagnetic valve and an auxiliary air inlet, the motor is cooled firstly and is mixed with the exhaust gas of the first-stage compression, and the mixed refrigerant is compressed again and then is discharged out of the quasi-two-stage or two-stage compressor; thus forming a cycle;
(4) refrigeration operation
When in refrigeration operation, the auxiliary air inlet of the compressor is closed, at the moment, the first electromagnetic valve and the second electromagnetic valve are opened, the other electromagnetic valves are closed, high-temperature and high-pressure refrigerant steam is discharged from an exhaust port of the quasi-two-stage or two-stage compressor, flows through the second electromagnetic valve through an a-d outlet of the four-way reversing valve and enters the outdoor heat exchanger, condensed liquid refrigerant flows through the main electronic expansion valve and enters the main economizer, the throttled refrigerant absorbs heat of indoor air in the indoor heat exchanger and is converted into refrigerant steam, and the refrigerant steam sequentially flows through the first electromagnetic valve and b-c outlets of the four-way reversing valve and returns to an air suction port of the quasi-two-stage or; thus constituting one cycle.
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| CN110686308B (en) * | 2019-10-25 | 2021-09-07 | 东北电力大学 | Solar energy and air source heat pump heat energy graded utilization system |
| CN110848845B (en) * | 2019-11-18 | 2024-02-20 | 珠海格力电器股份有限公司 | Air supplementing and enthalpy increasing heat pump system, control method and air conditioner |
| CN112361653B (en) * | 2020-10-28 | 2023-02-24 | 上海本家空调系统有限公司 | Heat pump driven by gas engine |
| CN112361655A (en) * | 2020-10-28 | 2021-02-12 | 上海本家空调系统有限公司 | Heat pump driven by gas engine |
| CN112361652A (en) * | 2020-10-28 | 2021-02-12 | 上海本家空调系统有限公司 | Heat pump driven by gas engine |
| CN112361654A (en) * | 2020-10-28 | 2021-02-12 | 上海本家空调系统有限公司 | Heat pump driven by gas engine |
| CN114608218A (en) * | 2022-03-23 | 2022-06-10 | 无锡中天新能源科技发展有限公司 | Double-heat-source coupling type heat pump system |
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| CN100561074C (en) * | 2008-08-15 | 2009-11-18 | 浙江大学 | A kind of multifunctional solar auxiliary air conditioning system |
| CN203629115U (en) * | 2013-12-30 | 2014-06-04 | 浙江商业职业技术学院 | Solar energy thermal storage and air energy combined multifunctional air conditioner |
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