Solar energy enhanced ejection type double-temperature heat source heat pump air conditioning system and refrigeration equipment

Abstract

The application discloses a solar energy enhanced jet type double-temperature heat source heat pump air conditioning system and refrigeration equipment, which comprises an outdoor heat exchanger, a four-way valve, an ejector, a first compressor, a first thrott valve, a low-temperature indoor heat exchanger, a second thrott valve, a second compressor, a high-temperature indoor heat exchanger, a third thrott valve, a working medium pump, a solar heat collecting evaporator, 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, an eighth electromagnetic valve, a first check valve, a second check valve and a third check valve. The application can realize step-by-step heating of warm air by using double-temperature heat sources in winter and realize temperature and humidity step-by-step processing by using double-temperature cold sources in summer, effectively reduces air conditioning energy consumption while taking into account comfort, organically combines solar energy and the double-temperature heat source heat pump system, improves the overall efficiency of the system by improving the suction pressure of the compressor, and has better annual operation energy efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning, in particular to a solar energy enhanced ejector type dual-temperature heat source heat pump air conditioning system and a refrigeration equipment. BACKGROUND

[0002] Air source heat pump air conditioning system has the advantages of high efficiency, energy saving, environmental protection and economy, and is widely used in building heating system. By utilizing environmental heat, air source heat pump air conditioning can send low temperature heat to high temperature, effectively reducing input energy, while meeting the requirements of winter heating and summer heating.

[0003] However, the traditional air source heat pump air conditioning system only provides a single heat source in winter. When the temperature of the radiator side rises greatly, due to the isothermal phase change characteristics of the condensation process, there is a temperature mismatch between the working fluid and the heat transfer fluid, which causes a large irreversible heat transfer. In the refrigeration mode, the traditional air conditioning system uses a single cold source to process air with heat and humidity load coupling. When the humidity is high, the air needs to be reheated to achieve the supply air temperature. The excessive cooling and reheating of the air result in high energy loss.

[0004] In addition, when the traditional air source heat pump air conditioning system works in cold regions, as the outdoor environment temperature decreases, the heating capacity of the system decreases rapidly, and the heat pump is difficult to supply enough heat to the indoor. At the same time, the compression ratio of the compressor gradually increases, and the heat pump system may even stop working due to the abnormally high temperature exhaust of the compressor, and the system reliability decreases.

[0005] In summary, a new dual-temperature heat pump air conditioning system is needed to reduce system energy consumption, improve comfort, and enhance heating performance and stability in cold regions. SUMMARY

[0006] The present application aims to at least solve one of the problems in the prior art. To this end, the present application provides a solar energy enhanced ejector type dual-temperature heat source heat pump air conditioning system, which solves the problems of large heat loss in winter and heat and humidity load coupling in summer by setting a double indoor heat exchanger, and further improves the operation performance of the system in cold regions by using solar energy and ejector.

[0007] The present application also provides a refrigeration equipment comprising the above-mentioned solar energy enhanced ejector type dual-temperature heat source heat pump air conditioning system.

[0008] The solar energy enhanced ejector dual-temperature heat source heat pump air conditioning system according to the first aspect of the embodiment of the present application comprises: an outdoor heat exchanger, a four-way valve, an ejector, a first compressor, a first throttling valve, a low-temperature indoor heat exchanger, a second throttling valve, a second compressor, a high-temperature indoor heat exchanger, a third throttling valve, a working medium pump, a solar heat collecting evaporator, 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, an eighth electromagnetic valve, a first check valve, a second check valve, and a third check valve, wherein the four-way valve has a first valve, a second valve, a third valve, and a fourth valve that can be opened and closed.

[0009] The outdoor heat exchanger is connected with the first valve, the outlet of the second valve is divided into a first path and a second path, the first path is connected with a secondary fluid inlet of the ejector through the first electromagnetic valve, the second path is connected to an inlet of the first compressor through a first common pipeline after being connected with an outlet of the second check valve through the second electromagnetic valve, and an outlet of the first compressor is connected with the fourth valve.

[0010] The third valve is divided into a third path and a fourth path, the third path is connected with the second throttling valve through the low-temperature indoor heat exchanger and then connected to the outdoor heat exchanger through a second common pipeline, the fourth path is connected with an inlet of the second compressor through the fourth electromagnetic valve, and an outlet of the second compressor is connected with the third check valve and then divided into a fifth path and a sixth path.

[0011] The fifth path is divided into a seventh path and an eighth path after the fifth electromagnetic valve, the seventh path is connected to the inlet of the first compressor through the first common pipeline after the third electromagnetic valve, and the eighth path is connected to the inlet of the first compressor through the first common pipeline after the eighth electromagnetic valve, the first throttling valve, and the first check valve.

[0012] The sixth path is divided into a ninth path and a tenth path after the high-temperature indoor heat exchanger, the ninth path is connected with the third throttling valve and then connected to the outdoor heat exchanger through the second common pipeline, and the tenth path is divided into an eleventh path and a twelfth path after the sixth electromagnetic valve.

[0013] The eleventh path is connected with the third throttling valve and the other end of the second throttling valve in parallel after the seventh electromagnetic valve, and then connected to the outdoor heat exchanger through the second common pipeline, and the twelfth path sequentially connects the working medium pump, the solar heat collecting evaporator, and a primary flow inlet of the ejector.

[0014] The solar energy enhanced ejector dual-temperature heat source heat pump air conditioning system according to the first aspect of the present application has at least the following beneficial effects: the present application can realize step-by-step heating of warm air by using a dual-temperature heat source in winter and realize step-by-step processing of temperature and humidity by using a dual-temperature cold source in summer, effectively reducing air conditioning energy consumption while taking into account comfort, in addition, the system innovatively combines solar energy with a dual-temperature heat source heat pump system, uses the working medium after heat absorption and vaporization as a primary flow of an ejector to inject a low-pressure and low-temperature secondary flow, and realizes improvement of the overall efficiency of the system by improving the suction pressure of the compressor; when the amount of light is insufficient, the system can be converted into a traditional heat pump system or a compression refrigeration system by adjusting the opening and closing of the valves, compared with the existing heat pump air conditioner working at a single temperature, the present application takes into account dual-temperature heating and dual-temperature refrigeration functions, can also reduce energy consumption by using solar energy, and adopts different operation modes according to the solar radiation intensity: a winter heat-assisted heating mode, a winter traditional heat pump heating mode, a summer heat-assisted refrigeration mode, and a summer traditional compression refrigeration mode, and has better annual operation energy efficiency.

[0015] The solar energy enhanced ejector dual-temperature heat source heat pump air conditioning system according to the first aspect of the present application has at least the following beneficial effects: the present application can realize step-by-step heating of warm air by using a dual-temperature heat source in winter and realize step-by-step processing of temperature and humidity by using a dual-temperature cold source in summer, effectively reducing air conditioning energy consumption while taking into account comfort, in addition, the system innovatively combines solar energy with a dual-temperature heat source heat pump system, uses the working medium after heat absorption and vaporization as a primary flow of an ejector to inject a low-pressure and low-temperature secondary flow, and realizes improvement of the overall efficiency of the system by improving the suction pressure of the compressor; when the amount of light is insufficient, the system can be converted into a traditional heat pump system or a compression refrigeration system by adjusting the opening and closing of the valves, compared with the existing heat pump air conditioner working at a single temperature, the present application takes into account dual-temperature heating and dual-temperature refrigeration functions, can also reduce energy consumption by using solar energy, and adopts different operation modes according to the solar radiation intensity: a winter heat-assisted heating mode, a winter traditional heat pump heating mode, a summer heat-assisted refrigeration mode, and a summer traditional compression refrigeration mode, and has better annual operation energy efficiency.

[0016] The solar energy enhanced ejector dual-temperature heat source heat pump air conditioning system according to the first aspect of the present application has at least the following beneficial effects: the present application can realize step-by-step heating of warm air by using a dual-temperature heat source in winter and realize step-by-step processing of temperature and humidity by using a dual-temperature cold source in summer, effectively reducing air conditioning energy consumption while taking into account comfort, in addition, the system innovatively combines solar energy with a dual-temperature heat source heat pump system, uses the working medium after heat absorption and vaporization as a primary flow of an ejector to inject a low-pressure and low-temperature secondary flow, and realizes improvement of the overall efficiency of the system by improving the suction pressure of the compressor; when the amount of light is insufficient, the system can be converted into a traditional heat pump system or a compression refrigeration system by adjusting the opening and closing of the valves, compared with the existing heat pump air conditioner working at a single temperature, the present application takes into account dual-temperature heating and dual-temperature refrigeration functions, can also reduce energy consumption by using solar energy, and adopts different operation modes according to the solar radiation intensity: a winter heat-assisted heating mode, a winter traditional heat pump heating mode, a summer heat-assisted refrigeration mode, and a summer traditional compression refrigeration mode, and has better annual operation energy efficiency.

[0017] The solar energy enhanced ejector dual-temperature heat source heat pump air conditioning system according to the first aspect of the present application has at least the following beneficial effects: the present application can realize step-by-step heating of warm air by using a dual-temperature heat source in winter and realize step-by-step processing of temperature and humidity by using a dual-temperature cold source in summer, effectively reducing air conditioning energy consumption while taking into account comfort, in addition, the system innovatively combines solar energy with a dual-temperature heat source heat pump system, uses the working medium after heat absorption and vaporization as a primary flow of an ejector to inject a low-pressure and low-temperature secondary flow, and realizes improvement of the overall efficiency of the system by improving the suction pressure of the compressor; when the amount of light is insufficient, the system can be converted into a traditional heat pump system or a compression refrigeration system by adjusting the opening and closing of the valves, compared with the existing heat pump air conditioner working at a single temperature, the present application takes into account dual-temperature heating and dual-temperature refrigeration functions, can also reduce energy consumption by using solar energy, and adopts different operation modes according to the solar radiation intensity: a winter heat-assisted heating mode, a winter traditional heat pump heating mode, a summer heat-assisted refrigeration mode, and a summer traditional compression refrigeration mode, and has better annual operation energy efficiency.

[0018] According to the solar energy enhanced ejector dual-temperature heat source heat pump air conditioning system of the first aspect of the present application, the third valve is connected to the second valve, the fourth valve is connected to the first valve, the first electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the sixth electromagnetic valve and the seventh electromagnetic valve are closed, and the second electromagnetic valve, the fifth electromagnetic valve and the eighth electromagnetic valve are opened, so that the solar energy enhanced ejector dual-temperature heat source heat pump air conditioning system enters the summer single-stage compression refrigeration mode.

[0019] According to the solar energy enhanced ejector dual-temperature heat source heat pump air conditioning system of the first aspect of the present application, the solar heat collecting evaporator adopts a spiral pipe fin heat collecting evaporator with a glass cover layer and a bottom heat insulation layer in cold regions, and adopts a full-naked spiral pipe fin heat collecting evaporator in warm regions.

[0020] According to the solar energy enhanced ejector dual-temperature heat source heat pump air conditioning system of the first aspect of the present application, a solar radiation measuring instrument is arranged on the solar heat collecting evaporator.

[0021] According to the solar energy enhanced ejector dual-temperature heat source heat pump air conditioning system of the first aspect of the present application, the first compressor and the second compressor adopt variable frequency compressors, the working medium pump adopts a variable frequency magnetic pump, and the first throttling valve, the second throttling valve and the third throttling valve adopt electronic expansion valves, so that the working medium flow is controlled by frequency adjustment and expansion valve opening degree, and the cold and heat loads of the low-temperature indoor heat exchanger and the high-temperature indoor heat exchanger are matched.

[0022] According to the solar energy enhanced ejector dual-temperature heat source heat pump air conditioning system of the first aspect of the present application, the low-temperature indoor heat exchanger and the high-temperature indoor heat exchanger are provided with room temperature sensors.

[0023] The refrigeration equipment of the second aspect of the present application comprises the solar energy enhanced ejector dual-temperature heat source heat pump air conditioning system of the first aspect of the present application.

[0024] It can be understood that the refrigeration equipment of the second aspect of the present application has the technical effects of the solar energy enhanced ejector dual-temperature heat source heat pump air conditioning system of the first aspect of the present application, and thus will not be described again.

[0025] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0026] The present application will be further described below in conjunction with the drawings and embodiments;

[0027] Figure 1A system schematic diagram in a winter heat-assisted heating mode of an embodiment of the present application;

[0028] Figure 2 A system schematic diagram in a summer heat-assisted refrigeration mode of an embodiment of the present application;

[0029] Figure 3 A system schematic diagram in a winter two-stage compression heat pump heating mode of an embodiment of the present application;

[0030] Figure 4 A system schematic diagram in a summer single-stage compression refrigeration mode of an embodiment of the present application.

[0031] Reference signs:

[0032] 1-outdoor heat exchanger, 2-four-way valve, 3-ejector, 4-first compressor, 5-first throttling valve, 6-low-temperature indoor heat exchanger, 7-second throttling valve, 8-second compressor, 9-high-temperature indoor heat exchanger, 10-third throttling valve, 11-working medium pump, 12-solar heat collecting evaporator;

[0033] 01-first electromagnetic valve, 02-second electromagnetic valve, 03-third electromagnetic valve, 04-fourth electromagnetic valve, 05-fifth electromagnetic valve, 06-sixth electromagnetic valve, 07-seventh electromagnetic valve, 08-eighth electromagnetic valve;

[0034] 001-first check valve, 002-second check valve, 003-third check valve;

[0035] 21-first valve, 22-second valve, 23-third valve, 24-fourth valve. DETAILED DESCRIPTION

[0036] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the present application, and cannot be understood as a limitation of the present application.

[0037] In the description of the present application, it is understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0038] In the description of the present application, the meaning of several is one or more, the meaning of multiple is at least two, greater than, less than, more than, etc. is understood as not including the number, above, below, within, etc. is understood as including the number. If the first, second is described, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0039] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0040] Reference Figures 1 to 4 The solar energy enhanced jet type double-temperature heat source heat pump air conditioning system of the first aspect embodiment of the present application comprises an outdoor heat exchanger 1, a four-way valve 2, an ejector 3, a first compressor 4, a first throttling valve 5, a low-temperature indoor heat exchanger 6, a second throttling valve 7, a second compressor 8, a high-temperature indoor heat exchanger 9, a third throttling valve 10, a working medium pump 11, a solar heat collecting evaporator 12, a first electromagnetic valve 01, a second electromagnetic valve 02, a third electromagnetic valve 03, a fourth electromagnetic valve 04, a fifth electromagnetic valve 05, a sixth electromagnetic valve 06, a seventh electromagnetic valve 07, an eighth electromagnetic valve 08, a first check valve 001, a second check valve 002, and a third check valve 003. The four-way valve 2 has first, second, third and fourth valves 21, 22, 23 and 24 which can be opened and closed.

[0041] The outdoor heat exchanger 1 is connected with the first valve 21. The outlet of the second valve 22 is divided into a first path and a second path. The first path is connected with the secondary fluid inlet of the ejector 3 through the first electromagnetic valve 01. The second path is connected with the outlet of the second check valve 002 through the second electromagnetic valve 02 and then connected to the inlet of the first compressor 4 through a first common pipeline. The outlet of the first compressor 4 is connected with the fourth valve 24.

[0042] The third valve 23 is divided into a third path and a fourth path. The third path is connected with the second throttling valve 7 through the low-temperature indoor heat exchanger 6 and then connected to the outdoor heat exchanger 1 through a second common pipeline. The fourth path is connected with the inlet of the second compressor 8 through the fourth electromagnetic valve 04. The outlet of the second compressor 8 is connected with the third check valve 003 and then divided into a fifth path and a sixth path.

[0043] The fifth path is divided into a seventh path and an eighth path through the fifth electromagnetic valve 05. The seventh path is connected to the inlet of the first compressor 4 through the first common pipeline after passing through the third electromagnetic valve 03. The eighth path is connected to the inlet of the first compressor 4 through the first common pipeline after passing through the eighth electromagnetic valve 08, the first throttling valve 5 and the first check valve 001.

[0044] The sixth path after passing through the high-temperature indoor heat exchanger 9 is divided into a ninth path and a tenth path, the ninth path is connected with the third throttling valve 10 and then connected to the outdoor heat exchanger 1 through the second common pipeline, and the tenth path passes through the sixth electromagnetic valve 06 and is divided into an eleventh path and a twelfth path;

[0045] The eleventh path is connected with the third throttling valve 10 and the other end of the second throttling valve 7 in parallel after passing through the seventh electromagnetic valve 07, and then connected to the outdoor heat exchanger 1 through the second common pipeline, and the twelfth path is sequentially connected with the working medium pump 11, the solar heat collecting evaporator 12 and the primary flow inlet of the ejector 3.

[0046] With reference to Figures 1 to 4 The solar enhanced ejector type double-temperature heat source heat pump air conditioning system of the first aspect embodiment of the present application can realize gradient heating of warm air by using double-temperature heat sources in winter and realize temperature and humidity gradient processing by using double-temperature cold sources in summer, effectively reducing the energy consumption of air conditioning while taking into account comfort. In addition, the system innovatively combines solar energy with the double-temperature heat source heat pump system, uses the working medium after heat absorption and vaporization as the primary flow of the ejector 3 to inject the low-pressure and low-temperature secondary flow, thereby improving the overall efficiency of the system by increasing the suction pressure of the compressor. When the amount of light is insufficient, the system can be converted into a traditional heat pump system or a compression refrigeration system by adjusting the opening and closing of the valves. Compared with the existing heat pump air conditioner working at a single temperature, the present application takes into account the functions of double-temperature heating and double-temperature refrigeration, can also reduce energy consumption by using solar energy, and can adopt different operating modes according to the solar radiation intensity: winter heat-assisted heating mode, winter traditional heat pump heating mode, summer heat-assisted refrigeration mode, and summer traditional compression refrigeration mode, thereby having better energy efficiency throughout the year.

[0047] It can be understood that the solar enhanced ejector type double-temperature heat source heat pump air conditioning system can realize heating or refrigeration application by setting the four-way valve 2. In the heating condition, two-stage compression is adopted to provide a double-temperature heat source for the warm air heating system. The double-temperature heat source includes low-temperature hot water (35℃) and high-temperature hot water (60℃), which are used for gradient heating processing of mixed air to realize double-temperature heating and control. In the refrigeration condition, single-stage compression is adopted to provide a double-temperature cold source for the air processing system. The double-temperature cold source includes high-temperature chilled water (18℃) and low-temperature chilled water (7℃), which are used for processing the sensible heat (cooling) and latent heat (dehumidification) of mixed air respectively to realize temperature and humidity gradient processing and control.

[0048] It should be noted that the system has four operating modes, namely winter heat-assisted heating mode, summer heat-assisted refrigeration mode, winter two-stage compression heat pump heating mode, and summer single-stage compression refrigeration mode. The connection mode of the four-way valve 2 changes according to the season, and the eight electromagnetic valves are controlled to open and close according to the solar radiation intensity to realize mode switching.

[0049] In some embodiments of the present application, with specific reference to Figure 1, the first valve 21 is communicated with the second valve 22, the fourth valve 24 is communicated with the third valve 23, the second electromagnetic valve 02, the third electromagnetic valve 03, the fifth electromagnetic valve 05, the seventh electromagnetic valve 07 and the eighth electromagnetic valve 08 are closed, and the first electromagnetic valve 01, the fourth electromagnetic valve 04 and the sixth electromagnetic valve 06 are opened, so that the solar energy enhanced ejector type dual-temperature heat source heat pump air conditioning system enters the winter heat-assisted heating mode.

[0050] It should be noted that when the solar radiation intensity is higher than 100 G / W·m 2 , the heat-assisted heating mode is entered, the working medium absorbs the heat of the air side in the outdoor heat exchanger 1 to a saturated gas state, the working medium after heat absorption flows through the first electromagnetic valve 01 as a secondary fluid into the ejector 3 through the passage of the first valve 21 to the second valve 22 of the four-way valve 2, and is mixed with the high-temperature and high-pressure primary flow from the solar heat collecting evaporator 12 in the ejector 3. The mixed fluid is compressed by the ejector 3 and then enters the first compressor 4 through the second check valve 002 for compression and pressure rise, and after flowing through the passage of the fourth valve 24 to the third valve 23 of the four-way valve 2, it is divided into two paths: one path flows into the second compressor 8 for further pressure rise after the fourth electromagnetic valve 04, and then enters the high-temperature indoor heat exchanger 9 for heat release after passing through the third check valve 003; the other path flows to the low-temperature indoor heat exchanger 6 for heat release, and the working medium after heat release flows through the second throttling valve 7 for throttling and pressure reduction to the evaporation pressure. Among them, the fluid after heat release in the high-temperature indoor heat exchanger 9 is divided into two paths: one path enters the working medium pump 11 for pressure rise after passing through the sixth electromagnetic valve 06, and the fluid after pressure rise enters the solar heat collecting evaporator 12 to directly absorb solar radiation heat, and the fluid after temperature rise enters the ejector 3 as a primary flow; the other path flows through the third throttling valve 10 to reduce the pressure to the evaporation pressure, and then mixes with the low-pressure fluid from the second throttling valve 7 and flows into the outdoor heat exchanger 1 to absorb heat, and the cycle is completed.

[0051] In some embodiments of the present application, with particular reference to Figure 2 , the third valve 23 is communicated with the second valve 22, the fourth valve 24 is communicated with the first valve 21, the second electromagnetic valve 02, the fourth electromagnetic valve 04, the sixth electromagnetic valve 06 and the eighth electromagnetic valve 08 are closed, and the first electromagnetic valve 01, the third electromagnetic valve 03, the fifth electromagnetic valve 05 and the seventh electromagnetic valve 07 are opened, so that the solar energy enhanced ejector type dual-temperature heat source heat pump air conditioning system enters the summer heat-assisted cooling mode.

[0052] It should be noted that when the solar radiation intensity is higher than 100 G / W·m 2When it is a heat-assisted refrigeration mode, the working medium is divided into three paths after heat release in the outdoor heat exchanger 1: the first path flows through the second throttling valve 7 to be throttled and reduced in pressure to a low-temperature evaporation pressure, then enters the low-temperature indoor heat exchanger 6 to absorb heat and refrigerate, and then flows through the third valve 23 to the second valve 22 of the four-way valve 2 and is guided to the ejector 3 as a secondary flow with the first electromagnetic valve 01; the second path flows through the third throttling valve 10 to be throttled and reduced in pressure to a medium-temperature evaporation pressure, then enters the high-temperature indoor heat exchanger 9 to absorb heat and refrigerate, and then flows through the fifth electromagnetic valve 05 and the third electromagnetic valve 03 in sequence and mixes with the fluid at the outlet of the second check valve 002; the third path flows through the seventh electromagnetic valve 07 and then enters the working medium pump 11, the fluid after being pressurized enters the solar heat collection evaporator 12 to directly absorb heat and evaporate, the high-temperature and high-pressure fluid flowing out of the solar heat collection evaporator 12 enters the ejector 3 as a primary flow to guide the working medium from the low-temperature indoor heat exchanger 6. The working medium at the outlet of the ejector 3 is mixed with the working medium at the outlet of the third electromagnetic valve 03 after flowing through the second check valve 002, is compressed and pressurized to a condensation pressure by the first compressor 4, then enters the outdoor heat exchanger 1 through the fourth valve 24 to the first valve 21 of the four-way valve 2 to release heat and condense, and the cycle is completed.

[0053] In some embodiments of the present application, with reference to Figure 3 , the first valve 21 is connected to the second valve 22, the fourth valve 24 is connected to the third valve 23, the first electromagnetic valve 01, the third electromagnetic valve 03, the fifth electromagnetic valve 05, the sixth electromagnetic valve 06, the seventh electromagnetic valve 07 and the eighth electromagnetic valve 08 are closed, and the second electromagnetic valve 02 and the fourth electromagnetic valve 04 are opened, so that the solar enhanced ejector type dual-temperature heat source heat pump air conditioning system enters the winter dual-stage compression heat pump heating mode.

[0054] It should be noted that in winter and when the solar radiation intensity is lower than 100 G / W·m 2 , it is a dual-stage compression heat pump heating mode, the working medium absorbs air side heat in the outdoor heat exchanger 1, then flows through the first valve 21 to the second valve 22 of the four-way valve 2 and the second electromagnetic valve 02 in sequence, and then enters the first compressor 4. The fluid after being pressurized flows through the fourth valve 24 to the third valve 23 of the four-way valve 2, then is divided into two paths: the first path enters the low-temperature indoor heat exchanger 6 to release heat and condense, and then enters the second throttling valve 7 to be throttled and reduced in pressure to an evaporation pressure; the second path enters the second compressor 8 to be further pressurized after the fourth electromagnetic valve 04, then enters the high-temperature indoor heat exchanger 9 to release heat after flowing through the third check valve 003, the saturated liquid after heat release enters the third throttling valve 10 to be throttled and reduced in pressure, and is mixed with the working medium from the second throttling valve 7, and then enters the outdoor heat exchanger 1 to absorb heat through the common pipeline, and the cycle is completed.

[0055] In some embodiments of the present application, with reference to Figure 4The third valve 23 is connected to the second valve 22, the fourth valve 24 is connected to the first valve 21, the first solenoid valve 01, the third solenoid valve 03, the fourth solenoid valve 04, the sixth solenoid valve 06 and the seventh solenoid valve 07 are closed, and the second solenoid valve 02, the fifth solenoid valve 05 and the eighth solenoid valve 08 are opened, so that the solar-enhanced jet dual-temperature heat pump air conditioning system enters the summer single-stage compression refrigeration mode.

[0056] It should be noted that this applies in summer when solar radiation intensity is below 100 G / W·m. 2 In single-stage compression refrigeration mode, the working fluid releases heat and condenses to a saturated liquid state in the outdoor heat exchanger 1. It is then divided into two paths: one path is throttled and depressurized to the low-temperature evaporation pressure by the second throttle valve 7 and enters the low-temperature indoor heat exchanger 6 to absorb heat and refrigerate. After flowing through the passage from the third valve 23 to the second valve 22 of the four-way valve 2, it passes through the second solenoid valve 02. The other path is throttled and depressurized to the medium-temperature evaporation pressure by the third throttle valve 10 and enters the high-temperature indoor heat exchanger 9 to absorb heat and refrigerate. After flowing through the fifth solenoid valve 05 and the eighth solenoid valve 08, it enters the first throttle valve 5 to be throttled and depressurized to the low-temperature evaporation pressure. Then, it passes through the first check valve 001 and mixes with the fluid from the second solenoid valve 02 before entering the first compressor 4 and being compressed to the condensing pressure. After flowing through the passage from the fourth valve 24 to the first valve 21 of the four-way valve 2, it enters the outdoor heat exchanger 1 to condense and release heat, completing the cycle.

[0057] In some embodiments of this application, to balance the heat absorption performance and economy of the solar thermal evaporator 12, a spiral tube-fin solar thermal evaporator 12 with a glass cover and bottom insulation layer is used in cold regions to reduce heat loss and improve heat pump efficiency. In warm regions, a fully exposed spiral tube-fin solar thermal evaporator is used to reduce radiation loss and cost. Preferably, a solar radiation meter is arranged on the solar thermal evaporator 12 to obtain the total solar radiation and switch modes according to the solar radiation intensity.

[0058] In some embodiments of this application, the first compressor 4 and the second compressor 8 are variable frequency compressors, the working fluid pump 11 is a variable frequency magnetic pump, and the first throttle valve 5, the second throttle valve 7, and the third throttle valve 10 are electronic expansion valves. The working fluid flow rate is controlled by frequency modulation and the opening degree of the expansion valves to match the heating and cooling loads of the low-temperature indoor heat exchanger 6 and the high-temperature indoor heat exchanger 9. Preferably, the low-temperature indoor heat exchanger 6 and the high-temperature indoor heat exchanger 9 are equipped with room temperature sensors.

[0059] In response, this invention also provides a method for controlling the cooling and heating load of a solar-enhanced jet-type dual-temperature heat pump air conditioning system, as detailed below:

[0060] Winter heat-assisted heating mode: when the difference between the temperature detected by the room temperature sensor and the target temperature exceeds the set range and is lower than the set temperature, the rotation speed of the compressor and the pump is increased, the exhaust volume per unit time is increased, and the opening degree of the expansion valve is increased; otherwise, the rotation speed of the compressor and the pump should be reduced, the exhaust volume per unit time is reduced, and the opening degree of the expansion valve is reduced.

[0061] Summer heat-assisted cooling mode: when the difference between the temperature detected by the room temperature sensor and the target temperature exceeds the set range and is higher than the set temperature, the rotation speed of the compressor and the pump is increased, the exhaust volume per unit time is increased, and the opening degree of the expansion valve is increased; otherwise, the rotation speed of the compressor and the pump should be reduced, the exhaust volume per unit time is reduced, and the opening degree of the expansion valve is reduced.

[0062] Winter two-stage compression heat pump heating mode: when the difference between the temperature detected by the room temperature sensor and the target temperature exceeds the set range and is lower than the set temperature, the rotation speed of the compressor is increased, and the opening degree of the expansion valve is increased; the rotation speed of the compressor should be reduced, and the opening degree of the expansion valve is reduced.

[0063] Summer single-stage compression cooling mode: when the difference between the temperature detected by the room temperature sensor and the target temperature exceeds the set range and is higher than the set temperature, the rotation speed of the compressor is increased, and the opening degree of the expansion valve is increased; otherwise, the rotation speed of the compressor should be reduced, and the opening degree of the expansion valve is reduced.

[0064] Further, capacity adjustment of low-temperature and high-temperature cold and heat loads can also be realized:

[0065] Heating mode: when the high-temperature side load is greater than the low-temperature side load, the rotation speed of the first compressor 4 is increased, the rotation speed of the second compressor 8 is reduced, the opening degree of the second expansion valve 7 is increased, and the opening degree of the third expansion valve 10 is reduced; otherwise, the rotation speed of the first compressor 4 is reduced, the rotation speed of the second compressor 8 is increased, the opening degree of the second expansion valve 7 is reduced, and the opening degree of the third expansion valve 10 is increased.

[0066] Cooling mode: when the high-temperature side load is greater than the low-temperature side load, the opening degree of the second expansion valve 7 is increased, and the opening degree of the third expansion valve 10 is reduced; otherwise, the opening degree of the second expansion valve 7 is reduced, and the opening degree of the third expansion valve 10 is increased.

[0067] Reference Figures 1 to 4 The solar enhanced jet dual-temperature heat source heat pump air conditioning system of the first aspect embodiment of the present application has the following advantages:

[0068] Firstly, the application can realize step-by-step heating of mixed air by sequentially passing through the low-temperature indoor heat exchanger 6 and the high-temperature indoor heat exchanger 9 in winter, so that the heat exchange performance between the working fluid and the air can be more closely matched; and the application can realize temperature and humidity step-by-step processing of mixed air by sequentially passing through the high-temperature indoor heat exchanger 9 and the low-temperature indoor heat exchanger 6 in summer, so that the air conditioning energy consumption can be reduced and the air quality can be improved.

[0069] Secondly, the application can flexibly switch the operation mode according to the season and the solar radiation amount, can fully utilize the solar energy and the air source energy by controlling the opening and closing of the electromagnetic valve, can effectively improve the energy utilization rate, can improve the heating performance of the heat pump system in a low-temperature environment, and can improve the economy of the system.

[0070] Thirdly, the application uses the solar heat collecting evaporator 12 as the generator to absorb solar energy to directly evaporate the high-pressure liquid from the condenser, so that the construction of the solar heat collecting subsystem can be avoided, and the compactness of the system can be improved. Meanwhile, the ejector 3 is introduced to match the multi-temperature evaporation or condensation process, the high-temperature and high-pressure working medium from the solar heat collecting evaporator 12 is used as the power fluid, the low-pressure working medium is entrained from the evaporator, and finally the pressure recovery and the reduction of the compressor power consumption are realized.

[0071] Fourthly, compared with the prior art which can only provide a single heat source or cold source, the application realizes the functions of double-temperature heating in winter and double-temperature refrigeration in summer, and further improves the system performance by using the solar energy and the ejector 3. In addition, the application has more flexible mode conversion capability to adapt to different application scenarios, and in the case of low / zero radiation, the application can still realize a higher heating performance coefficient in winter through the double-stage compression structure, and can ensure the stability of the system operation.

[0072] Reference Figures 1 to 4 The refrigeration equipment of the second aspect embodiment of the application can be an air conditioner or the like, and the refrigeration equipment includes the solar enhanced ejector type double-temperature heat source heat pump air conditioning system of the first aspect embodiment of the application, so that the system energy consumption can be reduced, the comfort can be improved, the heating performance and stability of the system in cold regions can be enhanced, and the like.

[0073] The technical features of the above-described embodiments can be combined in any manner, and to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the description.

[0074] The embodiments of the application are described in detail above in combination with the drawings, but the application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the application.

Claims

1. A solar energy enhanced ejector dual-temperature heat source heat pump air conditioning system, characterized in that, The system comprises: an outdoor heat exchanger, a four-way valve, an ejector, a first compressor, a first throttling valve, a low-temperature indoor heat exchanger, a second throttling valve, a second compressor, a high-temperature indoor heat exchanger, a third throttling valve, a working medium pump, a solar heat collecting evaporator, a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a fifth solenoid valve, a sixth solenoid valve, a seventh solenoid valve, an eighth solenoid valve, a first check valve, a second check valve, and a third check valve, wherein the four-way valve has first, second, third, and fourth valves that can be opened and closed; the outdoor heat exchanger is connected to the first valve, the outlet of the second valve is divided into a first path and a second path, the first path is connected to the secondary fluid inlet of the ejector through the first solenoid valve, the second path is connected to the outlet of the second check valve through the second solenoid valve and then connected to the inlet of the first compressor through a first common pipeline, and the outlet of the first compressor is connected to the fourth valve; the third valve is divided into a third path and a fourth path, the third path is connected to the second throttling valve through the low-temperature indoor heat exchanger and then connected to the outdoor heat exchanger through a second common pipeline, and the fourth path is connected to the inlet of the second compressor through the fourth solenoid valve, the outlet of the second compressor is connected to the third check valve and then divided into a fifth path and a sixth path; the fifth path is divided into a seventh path and an eighth path after the fifth solenoid valve, the seventh path is connected to the inlet of the first compressor through the first common pipeline after the third solenoid valve, and the eighth path is connected to the inlet of the first compressor through the first common pipeline after the eighth solenoid valve, the first throttling valve, and the first check valve; the sixth path is divided into a ninth path and a tenth path after the high-temperature indoor heat exchanger, the ninth path is connected to the third throttling valve and then connected to the outdoor heat exchanger through the second common pipeline, and the tenth path is divided into an eleventh path and a twelfth path after the sixth solenoid valve; the eleventh path is connected to the third throttling valve and the other end of the second throttling valve in parallel after the seventh solenoid valve, and then connected to the outdoor heat exchanger through the second common pipeline, and the twelfth path is connected to the working medium pump, the solar heat collecting evaporator, and the primary flow inlet of the ejector in sequence.

2. The solar enhanced ejector dual-temperature heat source heat pump air conditioning system according to claim 1, characterized in that: The first valve is connected to the second valve, the fourth valve is connected to the third valve, the second solenoid valve, the third solenoid valve, the fifth solenoid valve, the seventh solenoid valve, and the eighth solenoid valve are closed, and the first solenoid valve, the fourth solenoid valve, and the sixth solenoid valve are opened, so that the solar enhanced ejector type dual-temperature heat source heat pump air conditioning system enters the winter heat-assisted heating mode.

3. The solar enhanced ejector dual-temperature heat source heat pump air conditioning system according to claim 1, characterized in that: The third valve is connected to the second valve, the fourth valve is connected to the first valve, the second solenoid valve, the fourth solenoid valve, the sixth solenoid valve, and the eighth solenoid valve are closed, and the first solenoid valve, the third solenoid valve, the fifth solenoid valve, and the seventh solenoid valve are opened, so that the solar enhanced ejector type dual-temperature heat source heat pump air conditioning system enters the summer heat-assisted cooling mode.

4. The solar enhanced ejector dual-temperature heat source heat pump air conditioning system according to claim 1, characterized in that: The first valve is communicated with the second valve, the fourth valve is communicated with the third valve, the first solenoid valve, the third solenoid valve, the fifth solenoid valve, the sixth solenoid valve, the seventh solenoid valve and the eighth solenoid valve are closed, and the second solenoid valve and the fourth solenoid valve are opened, so that the solar energy enhanced ejection type dual-temperature heat source heat pump air conditioning system enters the winter two-stage compression heat pump heating mode.

5. The solar enhanced ejector dual-temperature heat source heat pump air conditioning system according to claim 1, characterized in that: The third valve is communicated with the second valve, the fourth valve is communicated with the first valve, the first solenoid valve, the third solenoid valve, the fourth solenoid valve, the sixth solenoid valve and the seventh solenoid valve are closed, and the second solenoid valve, the fifth solenoid valve and the eighth solenoid valve are opened, so that the solar energy enhanced ejection type dual-temperature heat source heat pump air conditioning system enters the summer single-stage compression refrigeration mode.

6. The solar enhanced ejector dual-temperature heat source heat pump air conditioning system of claim 1, wherein: The solar heat collecting evaporator adopts a spiral pipe fin heat collecting evaporator with a glass cover layer and a bottom heat insulation layer in cold regions, and adopts a full-naked spiral pipe fin heat collecting evaporator in warm regions.

7. The solar enhanced ejector dual-temperature heat source heat pump air conditioning system according to claim 6, characterized in that: A solar radiation measuring instrument is arranged on the solar heat collecting evaporator.

8. The solar enhanced ejector dual-temperature heat source heat pump air conditioning system of claim 1, wherein: The first compressor and the second compressor adopt variable frequency compressors, the working medium pump adopts a variable frequency magnetic pump, and the first thrott valve, the second thrott valve and the third thrott valve adopt electronic expansion valves, so as to control the working medium flow through frequency adjustment and expansion valve opening degree control, and match the cold and heat loads of the low-temperature indoor heat exchanger and the high-temperature indoor heat exchanger.

9. The solar enhanced ejector dual-temperature heat source heat pump air conditioning system according to claim 8, characterized in that: The low-temperature indoor heat exchanger and the high-temperature indoor heat exchanger are provided with room temperature sensors.

10. A refrigeration appliance characterized by, The solar energy enhanced ejection type dual-temperature heat source heat pump air conditioning system according to any one of claims 1 to 9. The solar energy enhanced ejection type dual-temperature heat source heat pump air conditioning system according to any one of claims 1 to 9.

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