Heat pump system combined with solar energy performance optimization

Abstract

The utility model relates to the technical field of air conditioners, in particular to a heat pump system combined with solar energy performance optimization. The heat pump system comprises a heating loop, a solar heat collection loop and a solar preheating optimization loop. A solar heat collection loop is used for collecting heat and storing the heat in a heat storage device, a refrigerant is heated before entering a finned heat exchanger through a solar preheating optimization loop, the frosting frequency of the finned heat exchanger is reduced, the operation stability of the system is enhanced, meanwhile, a heat pump intelligent control system is arranged, and according to the set superheat degree requirement, the energy consumption is reduced. The temperature sensor is used for collecting data, accurately adjusting and controlling the opening degree of the electromagnetic valve and reasonably adjusting the heat exchange amount of solar heat storage and a refrigerant, it is ensured that the temperature of the refrigerant entering the finned heat exchanger is at the optimal level, overheating or insufficiency is avoided, and the system energy efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to air conditioning technical field, specifically, relate to a kind of heat pump system in combination with solar energy performance optimization. BACKGROUND

[0002] Traditional heat pump unit as a kind of high-efficiency energy utilization equipment, is widely used in residential, commercial and industrial fields, especially in heating and hot water supply aspect.Heat pump system compared with traditional gas, oil heating system has higher energy efficiency ratio, usually can reach 3-5 times energy efficiency.But in low temperature environment, finned heat exchanger frosting phenomenon is still a big problem in heat pump unit operation.Frosting not only can affect the heating efficiency of heat pump, also can aggravate defrosting load, increase energy consumption.Therefore, how to effectively reduce the frosting degree of evaporator, is the key to improve the performance of heat pump hot water unit.

[0003] At present, heat pump unit defrosting frost mainly has 5 kinds of technology: reverse cycle defrosting method, electric heating defrosting method, fan forced defrosting method, liquid refrigerant injection defrosting method and hot gas defrosting method.The existing defrosting method can solve heat pump unit frosting problem to a certain extent, but in low temperature environment, frosting phenomenon still frequently occurs, and part method such as reverse cycle and electric heating defrosting there is certain energy waste, or because of thick frost and defrosting efficiency is low.In addition, existing technology still has room for improvement in refrigerant preheating and system stability.

[0004] Therefore, a refrigerant preheating method is needed, which can effectively avoid the frequent occurrence of frost layer when air conditioner is in low temperature heating, improve system stability and energy efficiency. Utility model content

[0005] The utility model solves the problem of low frosting efficiency of finned heat exchanger of heat pump system and improves the performance of heat pump system.

[0006] To solve the above problems, the utility model discloses the following technical scheme: a kind of heat pump system in combination with solar energy performance optimization, including heating circuit, solar heat collection circuit and solar preheating optimization circuit, heating circuit includes compressor, first heat exchanger, air supply path, first solenoid valve, finned heat exchanger, first heat exchanger first input end is connected compressor air outlet side, first heat exchanger first output end connects air supply path input end, air supply path first output end is connected with first solenoid valve and finned heat exchanger in series, air supply path second output end connects compressor back gas side, finned heat exchanger connects compressor back gas side;Solar preheating optimization circuit is parallel with first solenoid valve, and solar preheating optimization circuit includes second solenoid valve, third heat exchanger, third heat exchanger first input end connects air supply path, third heat exchanger first output end connects finned heat exchanger, third heat exchanger second input end connects second solenoid valve;Solar heat collection circuit includes: heat storage device and solar collector, heat storage device first input end connects third heat exchanger second output end, heat storage device second input end connects solar collector.

[0007] Compared with prior art, the technical effects reached by adopting the technical scheme are as follows: by setting solar heat collection circuit and solar preheating optimization circuit, the system can effectively utilize solar energy, a renewable energy source. The solar collector collects solar heat and transfers it to the heat storage device for storage, and the solar preheating optimization circuit can preheat the medium entering the finned heat exchanger with the collected solar heat, reducing the energy consumption of the heat pump system when heating conventionally, relying solely on electric energy to drive the compressor, improving the overall energy utilization efficiency of the system, and reducing operating costs. At the same time, by using the third heat exchanger in the bypass line of the second heat exchanger outlet first solenoid valve, when the first solenoid valve is closed, the refrigerant flows through the third heat exchanger, exchanges heat with the part of solar heat storage after being adjusted by the second solenoid valve, and then enters the finned heat exchanger, four-way valve and returns to the compressor. Among them, the solar collector absorbs solar radiation energy, and the heat is transferred to the main refrigerant through the heat storage device and the third heat exchanger, thereby increasing the temperature of the main refrigerant to reduce the risk of frosting of the evaporator in low temperature environment.

[0008] Further, the compressor back gas side includes a first back gas side and a second back gas side, and the air supply path includes a first electronic expansion valve and a second heat exchanger. The first input end of the second heat exchanger is connected to the first output end of the first heat exchanger in parallel with one side of the first electronic expansion valve, the first output end of the second heat exchanger is connected to the first solenoid valve, the second input end of the second heat exchanger is connected to the other side opposite to the first electronic expansion valve, and the second output end of the second heat exchanger is connected to the second back gas side.

[0009] Compared with the prior art, the technical effects achieved by the technical scheme are as follows: when the compressor is working, the high-temperature and high-pressure gaseous refrigerant discharged is heat-exchanged with the user end through the first heat exchanger, and then is branched, the main path refrigerant enters the second heat exchanger, and the auxiliary path refrigerant enters the second heat exchanger again after being throttled by the first electronic expansion valve to absorb the heat of the main path refrigerant and returns to the compressor. The main path refrigerant is further supercooled, flows through the second electronic expansion valve and the first electromagnetic valve in a constant open state, enters the fin heat exchanger to absorb heat and becomes gaseous-liquid two-phase refrigerant, and then passes through the four-way valve and the gas-liquid separator, and the gaseous refrigerant returns to the compressor to circulate. The main path refrigerant is heat-exchanged with the auxiliary path refrigerant throttled and depressurized by the first electronic expansion valve in the second heat exchanger, so that the auxiliary path refrigerant absorbs heat and evaporates into gas, and the temperature of the main path refrigerant is further reduced before throttling, so as to improve the heat exchange efficiency of the evaporator.

[0010] Further, the heating circuit further comprises a four-way valve, a first port of the four-way valve is connected to the gas outlet side of the compressor, a second port of the four-way valve is connected to the first input end of the first heat exchanger, a third port of the four-way valve is connected to the first gas return side, and a fourth port of the four-way valve is connected to the fin heat exchanger.

[0011] Compared with the prior art, the technical effects achieved by the technical scheme are as follows: the four-way valve ensures the switching of the refrigeration and heating functions of the heat pump system and the realization of the refrigeration and heating functions.

[0012] Further, the heating circuit further comprises a gas-liquid separator, the gas-liquid separator is arranged between the third port of the four-way valve and the first gas return side.

[0013] Compared with the prior art, the technical effects achieved by the technical scheme are as follows: in the heating cycle, the refrigerant circulates in the circuit and is in a gaseous-liquid mixed state. The gas-liquid separator is arranged between the third port of the four-way valve and the first gas return side of the compressor, and can effectively separate the gaseous refrigerant and the liquid refrigerant. If the liquid refrigerant directly enters the compressor, liquid hammering may occur, which seriously damages the internal structure of the compressor and shortens the service life of the compressor. The gas-liquid separator allows only the gaseous refrigerant to enter the compressor through its separation function, avoids the risk of liquid hammering, ensures the safe and stable operation of the compressor, reduces the frequency of equipment failure and maintenance, ensures the continuous and normal operation of the heat pump system, reduces the system downtime and maintenance cost caused by the damage of the compressor.

[0014] Further, the gas supplementing circuit further comprises a first filter, the first filter is arranged between the first electronic expansion valve and the first output end of the first heat exchanger.

[0015] Compared with the prior art, the technical effects achieved by adopting the technical scheme are as follows: in the heat pump system operation process, various impurities such as metal scraps, oxide scales and dust may exist in the refrigerant circulation loop. If these impurities enter the first electronic expansion valve, the second heat exchanger and other precision components, the components may be worn and blocked, the normal working performance is affected, and even the components are damaged and fail. The first filter is located between the first electronic expansion valve and the first output end of the first heat exchanger, can effectively intercept these impurities, prevent them from entering the first electronic expansion valve, play a protection role, reduce the frequency of component maintenance and replacement, reduce the system maintenance cost, and ensure long-term stable operation of the system.

[0016] Further, the heating circuit further comprises: a second electronic expansion valve, which is arranged between the output end of the air supplementing circuit and the first electromagnetic valve.

[0017] Compared with the prior art, the technical effects achieved by adopting the technical scheme are as follows: in the heat pump system operation process, when the heat storage device needs to exchange heat with the heating circuit, the refrigerant is throttled and depressurized by the second electronic expansion valve, so that the energy efficiency ratio of the entire heat pump system is improved, and the operation energy consumption is reduced.

[0018] Further, the heating circuit further comprises a second filter, which is connected in series with the second electronic expansion valve.

[0019] Compared with the prior art, the technical effects achieved by adopting the technical scheme are as follows: in the heat pump system operation process, there may be small impurities in the refrigerant circulation pipeline. Although there may be other filtering links in the system, it is still difficult to completely avoid the impurities from entering this area. The second filter can effectively intercept these impurities, prevent them from entering the second electronic expansion valve, and avoid the problems of valve port blockage and valve core jamming.

[0020] Further, the solar heat collecting circuit further comprises a heat collecting water pump, one end of the heat collecting water pump is connected with the solar heat collector, and the other end of the heat collecting water pump is connected with the second output end of the heat storage device.

[0021] Compared with the prior art, the technical effects achieved by adopting the technical scheme are as follows: in the solar heat collecting circuit, the heat collecting water pump provides power for the working medium circulation. It makes the antifreeze working medium circulate between the solar heat collector and the heat storage device. When the solar heat collector absorbs solar radiation energy, the temperature of the working medium rises, the heat collecting water pump drives the hot working medium to return to the heat storage device, and exchanges heat with the internal liquid in the heat storage device to store heat.

[0022] Further, the heat pump system further comprises a detection module, and the detection module comprises a temperature detector arranged on the compressor.

[0023] And / or, the temperature detector is arranged on the first heat exchanger.

[0024] And / or, the temperature detector is arranged on the air supplementing path.

[0025] Further, the detection module further comprises a pressure detector arranged on the outlet side of the compressor.

[0026] Compared with the prior art, the technical effects achieved by the technical scheme are as follows: the heat pump system adopts an intelligent control strategy, intelligently controls the opening and closing of the electromagnetic valve and the water pump according to real-time data such as the ambient temperature, the refrigerant temperature and the evaporator temperature, adjusts the heat exchange process between the solar heat collection and the main refrigerant, the control system adjusts the second electromagnetic valve opening degree according to the set superheat degree requirement, further adjusts the refrigerant mass flow, reasonably adjusts the heat exchange amount, so that the refrigerant temperature entering the evaporator reaches the optimal level, and the refrigerant overheating or deficiency is avoided, thereby improving the system energy efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a schematic diagram of a heat pump system combined with solar performance optimization according to an embodiment of the present application;

[0028] Figure 2 It is Figure 1 It is an enlarged view of A;

[0029] Figure 3 It is a running control logic block diagram of a heat pump system combined with solar performance optimization in winter running conditions according to an embodiment of the present application.

[0030] Explanation of reference numerals: 1 - compressor; 1a - compressor gas outlet side; 1b - first gas return side; 1c - second gas return side; 2 - four-way valve; 2a - four-way valve first port; 2b - four-way valve second port; 2c - four-way valve third port; 2d - four-way valve fourth port; 3 - first heat exchanger; 3a - first heat exchanger first input; 3b - first heat exchanger first output; 3c - first heat exchanger second input; 3d - first heat exchanger second output; 4 - first filter; 5 - first electronic expansion valve; 6 - second heat exchanger; 6a - second heat exchanger first input; 6b - second heat exchanger first output; 6c - second heat exchanger second input; 6d - second heat exchanger second output; 7 - second filter; 8 - second electronic expansion valve; 9 - third filter; 10 - first solenoid valve; 11 - third heat exchanger; 11a - third heat exchanger first input; 11b - third heat exchanger first output; 11c - third heat exchanger second input; 11d - third heat exchanger second output; 12 - second solenoid valve; 13 - heat storage device; 13a - heat storage device first input; 13b - heat storage device first output; 13c - heat storage device second input; 13d - heat storage device second output; 14 - heat collection pump; 15 - solar heat collector; 16 - finned heat exchanger; 17 - gas-liquid separator; 18 - first temperature sensor; 19 - first pressure sensor; 20 - second temperature sensor; 21 - third temperature sensor; 22 - fourth temperature sensor; 23 - fifth temperature sensor; 24 - sixth temperature sensor; 25 - seventh temperature sensor; 26 - eighth temperature sensor; 27 - ninth temperature sensor; 28 - tenth temperature sensor; DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purpose, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings.

[0032] Reference is made to Figures 1-3To solve the above problems, the utility model discloses the following technical scheme: a heat pump system combined with solar energy performance optimization, including heating circuit, solar heat collection circuit and solar preheating optimization circuit, heating circuit includes compressor 1, first heat exchanger 3, air supply path, first solenoid valve 10, finned heat exchanger 16, first heat exchanger 3 first input end 3a connects compressor air outlet side 1a, first heat exchanger 3 first output end 3b connects air supply path input end, and the first output end of air supply path is in series with first solenoid valve 10 and finned heat exchanger 16, and air supply path second output end connects compressor 1 back gas side, and finned heat exchanger 16 connects compressor 1 back gas side;Solar preheating optimization circuit is parallelly connected with first solenoid valve 10, and solar preheating optimization circuit includes second solenoid valve 12, third heat exchanger 11, and third heat exchanger first input end 11a connects air supply path, and third heat exchanger first output end 11b connects finned heat exchanger 16, and third heat exchanger second input end 11c connects second solenoid valve 12;Solar heat collection circuit includes: heat storage device 13 and solar collector 15, and heat storage device first input end 13a connects third heat exchanger second output end 11d, and heat storage device second input end 13c connects solar collector 15.

[0033] By setting solar heat collection circuit and solar preheating optimization circuit, the system can effectively utilize solar energy, a renewable energy source.Solar collector 15 collects solar heat and transfers to heat storage device 13 for storage, and solar preheating optimization circuit can preheat medium entering finned heat exchanger 16 with the collected solar heat, reducing energy consumption of the heat pump system when heating conventionally, relying solely on electric energy to drive compressor 1, improving the overall energy utilization efficiency of the system and reducing operating costs.At the same time, by using third heat exchanger 11 in the bypass line of second heat exchanger 6 outlet first solenoid valve 10, when first solenoid valve 10 is closed, refrigerant flows through third heat exchanger 11, exchanges heat with part of solar heat storage capacity adjusted by second solenoid valve 12, and then enters finned heat exchanger 16, four-way valve 2 and returns to compressor 1.Solar collector 15 absorbs solar radiation energy, transfers heat to main refrigerant through heat storage device 13 and third heat exchanger 11, thereby increasing the temperature of main refrigerant to reduce the risk of frost formation in the evaporator in low temperature environment.

[0034] Specifically, as Figure 1 and Figure 2As shown, the compressor 1 back gas side includes a first back gas side 1b and a second back gas side 1c, and the air supply path includes a first electronic expansion valve 5 and a second heat exchanger 6. The first input end 6a of the second heat exchanger is connected in parallel to one side of the first electronic expansion valve 5 at the first output end 3b of the first heat exchanger 3, the first output end 6b of the second heat exchanger is connected to the first electromagnetic valve 10, and the second input end 6c of the second heat exchanger is connected to the other side opposite the first electronic expansion valve 5, and the second output end 6d of the second heat exchanger is connected to the second back gas side 1c.

[0035] When the compressor is working, the high-temperature and high-pressure gaseous refrigerant discharged by the compressor is exchanged with the user end through the first heat exchanger 3, and then is divided into two paths. The main path refrigerant enters the second heat exchanger 6, and the auxiliary path refrigerant enters the second heat exchanger 6 after being throttled by the first electronic expansion valve 5 to absorb the heat of the main path refrigerant again, and returns to the compressor 1. The main path refrigerant is further supercooled, flows through the second electronic expansion valve 8 and the first electromagnetic valve 10 which is always open, enters the fin heat exchanger 16 to absorb heat and become gas-liquid two-phase refrigerant, and then passes through the four-way valve 2 and the gas-liquid separator 17, and the gaseous refrigerant returns to the compressor 1 to form a cycle. The main path refrigerant exchanges heat with the auxiliary path refrigerant which is throttled and depressurized by the first electronic expansion valve 5 in the second heat exchanger 6, so that the auxiliary path refrigerant absorbs heat and evaporates into gas, and the temperature of the main path refrigerant is further reduced before throttling to improve the heat exchange efficiency of the evaporator.

[0036] Specifically, as shown in Figure 1 and Figure 2 , the heating circuit further includes a four-way valve 2, the first port 2a of the four-way valve is connected to the compressor outlet side 1a, the second port 2b of the four-way valve is connected to the first input end 3a of the first heat exchanger 3, the third port 2c of the four-way valve is connected to the first back gas side 1b, and the fourth port 2d of the four-way valve is connected to the fin heat exchanger 16.

[0037] The four-way valve 2 ensures the switching of the refrigeration and heating functions of the heat pump system and the realization of the refrigeration and heating functions.

[0038] Specifically, as shown in Figure 1 and Figure 2 , the heating circuit further includes a gas-liquid separator 17, which is arranged between the third port 2c of the four-way valve and the first back gas side 1b.

[0039] In the heating cycle, the refrigerant after circulating through the circuit will be in a gas-liquid mixed state. The gas-liquid separator 17 is arranged between the third port 2c of the four-way valve and the first return gas side 1b of the compressor, which can effectively separate the gaseous refrigerant and the liquid refrigerant. If the liquid refrigerant directly enters the compressor 1, it may cause liquid knock phenomenon, seriously damage the internal structure of the compressor 1, and shorten its service life. The gas-liquid separator 17 allows only gaseous refrigerant to enter the compressor 1 through its own separation action, avoiding the risk of liquid knock, ensuring the safe and stable operation of the compressor 1, reducing the frequency of equipment failure maintenance, ensuring the continuous normal work of the heat pump system, and reducing the system downtime and maintenance costs caused by the damage of the compressor 1.

[0040] Specifically, as shown in Figure 1 and Figure 2 , the gas supplementing circuit further comprises: a first filter 4, which is arranged between the first electronic expansion valve 5 and the first output end 3b of the first heat exchanger 3.

[0041] During the operation of the heat pump system, various impurities such as metal chips, oxide scales, dust, etc. may exist in the refrigerant circulation circuit. If these impurities enter the first electronic expansion valve 5, the second heat exchanger 6 and other precision components, they may cause component wear and blockage, affect their normal working performance, and even cause component damage and failure. The first filter 4 is located between the first electronic expansion valve 5 and the first output end 3b of the first heat exchanger 3, which can effectively intercept these impurities and prevent them from entering the first electronic expansion valve 5, thereby playing a protective role, reducing the frequency of component maintenance and replacement, reducing system maintenance costs, and ensuring long-term stable operation of the system.

[0042] Specifically, as shown in Figure 1 and Figure 2 , the heating circuit further comprises: a second electronic expansion valve 8, which is arranged between the output end of the gas supplementing circuit and the first electromagnetic valve 10.

[0043] During the operation of the heat pump system, when the heat storage device 13 needs to exchange heat with the heating circuit, the refrigerant is throttled and depressurized by the second electronic expansion valve 8, thereby improving the energy efficiency ratio of the entire heat pump system and reducing the operating energy consumption.

[0044] Specifically, as shown in Figure 1 and Figure 2 , the heating circuit further comprises a second filter 7, which is connected in series with the second electronic expansion valve 8.

[0045] For example, the second filter 7 can be arranged between the second heat exchanger 6 and the second electronic expansion valve 8, and / or the third filter 9 is arranged between the first electromagnetic valve 10 and the second electronic expansion valve 8.

[0046] In the heat pump system operation, there may be small impurities in the refrigerant circulation pipeline, although the system may have other filtering links, but it is still difficult to completely avoid the impurities into this area. The second filter 7 and the third filter 9 can effectively intercept these impurities, prevent them from entering the second electronic expansion valve 8, and avoid the problem of valve port blockage and valve core jamming.

[0047] Specifically, as shown in Figure 1 and Figure 2 , the solar heat collection circuit further comprises a heat collection water pump 14, one end of which is connected to the solar heat collector 15, and the other end is connected to the second output end 13d of the heat storage device.

[0048] In the solar heat collection circuit, the heat collection water pump 14 provides power for the working medium circulation. It makes the antifreeze working medium circulate between the solar heat collector 15 and the heat storage device 13. When the solar heat collector 15 absorbs solar radiation energy, the temperature of the working medium rises, and the heat collection water pump 14 drives the hot working medium to return to the heat storage device 13, and exchanges heat with the internal liquid in the heat storage device 13., store heat.

[0049] Referring to Figure 1 and Figure 2 , for example, the high-temperature and high-pressure gaseous refrigerant on the outlet side 1a of the compressor passes through the four-way valve 2, connects the first input end 3a of the first heat exchanger, and the first output end 3b of the first heat exchanger is divided into two paths. The auxiliary path passes through the first filter 4, the first electronic expansion valve 5, and connects the second input end 6c of the second heat exchanger, and the second output end 6d of the second heat exchanger connects the second gas return side 1c of the compressor. The main path connects the first input end 6a of the second heat exchanger, and the first output end 6b of the second heat exchanger passes through the second filter 7, the second electronic expansion valve 8, and the third filter 9, and there are two paths. The heating cycle circuit connects the input end of the finned heat exchanger 16 through the first electromagnetic valve 10. The solar preheating optimization circuit connects the first input end 11a of the third heat exchanger, and the first output end 11b of the third heat exchanger connects the input end of the finned heat exchanger 16. At the same time, the second output end 11d of the third heat exchanger connects the first input end 13a of the heat storage device, and the first output end 13b of the heat storage device is adjusted through the second electromagnetic valve 12, and then connects the second input end 11c of the third heat exchanger. The second output end 13d of the heat storage device connects the input end of the solar heat collector 15 through the heat collection water pump 14, the output end of the solar heat collector 15 connects the second input end 13c of the heat storage device, and the output end of the finned heat exchanger 16 connects the first gas return side 1b of the compressor through the four-way valve 2 and the gas-liquid separator 17., in this way, the cycle is completed.

[0050] For example, referring to Figures 1-3, the heat pump system further comprises a detection module, the detection module comprising a temperature detector and a pressure detector, a first temperature sensor 18 and a first pressure sensor 19 are installed at the compressor outlet side 1a to monitor the compressor 1 discharge temperature and pressure. The second input end 3c of the first heat exchanger and the second output end 3d of the first heat exchanger are provided with a second temperature sensor 20 and a third temperature sensor 21 to monitor the inlet and outlet water temperature of the user side. The fourth temperature sensor 22 and the fifth temperature sensor 23 are installed at the second input end 6c of the second heat exchanger and the second output end 6d of the second heat exchanger to monitor the inlet and outlet temperature of the auxiliary road. The sixth temperature sensor 24 is installed at the input end of the first electromagnetic valve 10 to monitor the main road refrigerant temperature. The seventh temperature sensor 25 is installed at the first output end 13b of the heat storage device to monitor the temperature of the first output end 13b of the heat storage device. The eighth temperature sensor 26 and the ninth temperature sensor 27 are installed on the outer surface and the bottom output end of the finned heat exchanger 16 to monitor the ambient temperature and the outlet temperature of the finned heat exchanger 16; the tenth temperature sensor 28 is installed at the first gas return side 1b to monitor the compressor 1 suction temperature.

[0051] The heat pump system adopts intelligent control strategy, according to the real-time data of environment temperature, refrigerant temperature, evaporator temperature, etc., intelligently controls the opening and closing of the first electromagnetic valve 10, the second electromagnetic valve 12 and the heat collecting water pump 14, adjusts the heat exchange process between the solar heat collecting road and the main road refrigerant. The control system will adjust the opening degree of the second electromagnetic valve 12 according to the set superheat requirement, further adjust the refrigerant mass flow rate, reasonably adjust the heat exchange amount, so that the refrigerant temperature entering the evaporator reaches the best level, avoids the overheat or insufficient of the refrigerant, and improves the system energy efficiency.

[0052] Specifically, temperature sensors t1 and t2 are installed at the outlet of the heat storage device 13 and the front end position of the first electromagnetic valve 10, t1 is the temperature shown by the temperature sensor 25, t2 is the temperature shown by the temperature sensor 24, when Δt≥Δt0, the first electromagnetic valve is closed, the refrigerant flows through the third heat exchanger 11 for preheating (Δt=t1-t2, Δt0 is the set temperature of the system to start the solar preheating loop, such as 3℃).

[0053] Referring to Figures 1-3 , in winter, when the solar radiation intensity is small, the solar heat collecting loop does not work, and the solar radiation intensity is small, that is, the effective heat of solar radiation is less than or equal to the heat loss of the antifreeze working medium after heat exchange with the hot water in the heat storage device 13 in the solar heat collector 15. The effective heat of solar radiation refers to the heat that can be absorbed by the antifreeze working medium in the solar heat collector 15, because the temperature of the hot water in the heat storage device 13 is higher than the ambient temperature, there is heat loss in the solar heat collector 15.

[0054] Correspondingly, when the solar radiation intensity is large, the solar heat collecting loop works. The solar radiation intensity is large, that is, the effective heat of solar radiation is greater than the heat loss of the antifreeze working medium in the solar collector 15. In the solar heat collecting loop, the antifreeze working medium is powered by the heat collecting water pump 14 to circulate in the heat collecting loop. Among them, the working medium absorbs heat after the solar collector 15, returns to the second input end 13c of the heat storage device and exchanges heat with the liquid in the heat storage device 13, so as to circulate, so that the temperature of the hot water in the heat storage device 13 is continuously increased to the set value.

[0055] When the temperature of the first output end 13b of the heat storage device, that is, the temperature shown by the temperature sensor 25, and the temperature of the main road refrigerant, that is, the temperature shown by the temperature sensor 24, are greater than the set temperature of the system opening solar preheating loop (that is, ΔT=T1-T2≥Δt0), the solar preheating loop works. In the solar preheating loop, the refrigerant is sucked into the compressor 1 after being compressed and discharged, enters the first heat exchanger 2, the refrigerant releases heat and condenses in it, so that the temperature of the hot water on the user side is increased, and then the refrigerant flows out of the first heat exchanger 2 and is divided into two ways. The auxiliary road refrigerant passes through the first filter 4, the first electronic expansion valve 5, and then the second heat exchanger 6 to absorb heat and evaporate into gaseous refrigerant, and then is sucked into the middle compression chamber through the jet port of the compressor 1. The main road refrigerant flows through the second heat exchanger 6 and completes heat exchange with the evaporated auxiliary road refrigerant, realizes supercooling before throttling, and then throttles and depressurizes through the second electronic expansion valve 8. Then, through the third heat exchanger 11 (at this time, the first electromagnetic valve 10 is closed), the heat exchange with the hot water in the heat storage device 13 adjusted by the second electromagnetic valve 12 is carried out, the low-temperature refrigerant entering the evaporator is preheated, and then the second heat exchange with the air is carried out in the finned heat exchanger 16. After the four-way valve 2 and the gas-liquid separator 17, the refrigerant is finally sucked into the compressor 1, and the cycle is repeated.

[0056] When the temperature of the first output end 13b of the heat storage device, that is, the temperature shown by the temperature sensor 25, and the temperature of the main road refrigerant, that is, the temperature shown by the temperature sensor 24, are less than or equal to the set temperature of the system opening solar preheating loop (that is, Δt=t1-t2≤Δt0), the heating cycle loop works. In the heating cycle loop, the refrigerant is sucked into the compressor 1 after being compressed and discharged, enters the first heat exchanger 2, the refrigerant releases heat and condenses in it, so that the temperature of the hot water on the user side is increased, and then the refrigerant flows out of the first heat exchanger 2 and is divided into two ways. The auxiliary road refrigerant passes through the filter 4, the auxiliary first electronic expansion valve 5, and then the second heat exchanger 6 to absorb heat and evaporate into gaseous refrigerant, and then is sucked into the middle compression chamber through the jet port of the compressor 1. The main road refrigerant flows through the second heat exchanger 6 and completes heat exchange with the evaporated auxiliary road refrigerant, realizes supercooling before throttling, and then throttles and depressurizes through the second electronic expansion valve 8. At this time, the first electromagnetic valve 10 is opened, the refrigerant enters the finned heat exchanger 16 and exchanges heat with the air, then passes through the four-way valve 2 and the gas-liquid separator 17, and finally is sucked into the compressor 1, and the cycle is repeated.

[0057] When the solar preheating optimized loop works under the condition of ultra-low temperature and frost appears on the outside of the finned heat exchanger 16, the heat pump system will automatically adopt the reverse cycle defrosting method to defrost the system.

[0058] Although the utility model discloses as above, the utility model is not limited to this. Any person skilled in the art, without departing from the spirit and scope of the utility model, can make various changes and modifications, therefore the protection scope of the utility model should be limited to the range defined by the claims.

Claims

1. A heat pump system integrated with solar energy performance optimization, characterized in that, The heat pump system comprises: The heating circuit, the solar heat collecting circuit and the solar preheating optimization circuit, the heating circuit comprises a compressor (1), a first heat exchanger (3), a gas supplement path, a first electromagnetic valve (10) (10), a fin heat exchanger (16), the first input end (3a) of the first heat exchanger is connected to the gas outlet side (1a) of the compressor, the first output end (3b) of the first heat exchanger is connected to the input end of the gas supplement path, the first output end of the gas supplement path is connected in series with the first electromagnetic valve (10) and the fin heat exchanger (16), the second output end of the gas supplement path is connected to the gas return side of the compressor (1), and the fin heat exchanger (16) is connected to the gas return side of the compressor (1); The solar preheating optimization circuit is connected in parallel with the first electromagnetic valve (10), the solar preheating optimization circuit comprises a second electromagnetic valve (12) and a third heat exchanger (11), the first input end of the third heat exchanger is connected to the gas supplement path, the first output end (11b) of the third heat exchanger is connected to the fin heat exchanger (16), and the second input end (11c) of the third heat exchanger is connected to the second electromagnetic valve (12); The solar heat collecting circuit comprises a heat storage device (13) and a solar heat collector (15) (15), the first input end (13a) of the heat storage device is connected to the second output end (11d) of the third heat exchanger, and the second input end (13c) of the heat storage device is connected to the solar heat collector (15).

2. The heat pump system of claim 1, wherein, The gas return side of the compressor (1) comprises a second gas return side (1c), the gas supplement path comprises a first electronic expansion valve (5) and a second heat exchanger (6), the first input end (6a) of the second heat exchanger is connected in parallel with one side of the first electronic expansion valve (5) at the first output end (3b) of the first heat exchanger, the first output end (6b) of the second heat exchanger is connected to the first electromagnetic valve (10), the second input end (6c) of the second heat exchanger is connected to the other side opposite to the first electronic expansion valve (5), and the second output end (6d) of the second heat exchanger is connected to the second gas return side (1c).

3. The heat pump system of claim 2, wherein, The gas return side of the compressor (1) comprises a first gas return side (1b), and the heating circuit further comprises a four-way valve (2), the first port (2a) of the four-way valve is connected to the gas outlet side (1a) of the compressor, the second port (2b) of the four-way valve is connected to the first input end (3a) of the first heat exchanger, the third port (2c) of the four-way valve is connected to the first gas return side (1b), and the fourth port (2d) of the four-way valve is connected to the fin heat exchanger (16).

4. The heat pump system of claim 3, wherein, The heating circuit further comprises a gas-liquid separator (17), and the gas-liquid separator (17) is arranged between the third port (2c) of the four-way valve and the first gas return side (1b).

5. The heat pump system of claim 2, wherein, The gas supplement path further comprises a first filter (4), and the first filter (4) is arranged between the first electronic expansion valve (5) and the first output end (3b) of the first heat exchanger.

6. The heat pump system of claim 1, wherein, The heating circuit further comprises a second electronic expansion valve (8), and the second electronic expansion valve (8) is arranged between the output end of the gas supplement path and the first electromagnetic valve (10).

7. The heat pump system of claim 6, wherein, The heating circuit further comprises a second filter (7), and the second filter (7) is connected in series with the second electronic expansion valve (8).

8. The heat pump system of claim 1, wherein, The solar heat collecting loop further comprises a heat collecting water pump (14) connected to the solar heat collector (15) at one end and to the second output end (13d) of the heat storage device at the other end.

9. The heat pump system according to any one of claims 1 to 8, characterized in that, The heat pump system further comprises a detection module, wherein the detection module comprises a temperature detector arranged on the compressor (1). And / or, the temperature detector is arranged on the first heat exchanger (3). And / or, the temperature detector is arranged on the air supplementing path.

10. The heat pump system of claim 9, wherein, The detection module further comprises a pressure detector arranged on the gas outlet side (1a) of the compressor.

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