CN105318559B - Solar energy and air source heat pump hot water system and control method - Google Patents
Solar energy and air source heat pump hot water system and control method Download PDFInfo
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- CN105318559B CN105318559B CN201410308136.9A CN201410308136A CN105318559B CN 105318559 B CN105318559 B CN 105318559B CN 201410308136 A CN201410308136 A CN 201410308136A CN 105318559 B CN105318559 B CN 105318559B
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Abstract
The invention discloses a solar energy and air source heat pump hot water system and a control method, comprising a hot water reservoir (22), a solar energy hot water system for supplying heat to the hot water reservoir (22) and an air source heat pump hot water system with double evaporators; the solar water heating system is formed by connecting a water heating system circulating water pump (21), a third electromagnetic valve (6), a solar heat collecting system circulating water pump (1), a solar heat collector (2) and a sixth electromagnetic valve (9) in series and related connecting pipelines. According to the invention, the solar water heating system and the air source heat pump water heating system are organically combined, so that the solar water heating system and the air source heat pump water heating system can be adopted for supplying heat singly, complementarily or jointly according to different weather conditions, the efficient utilization of solar energy is realized, the working efficiency of the air source heat pump is improved, and the energy consumption is saved.
Description
Technical Field
The invention relates to a solar energy and air source heat pump hot water system and a control method, and belongs to the technical field of solar energy and air source heat pump application.
Background
The most widely used in the building at present is to utilize solar energy or air source heat pump to prepare the hot water required by the building. However, the solar energy or the air source heat pump is used alone and is easily limited by factors such as regions, outdoor environments and the like, so that the system can only be applied to regions limited by certain conditions or can not realize multi-working-condition operation. Therefore, a hot water system combining solar energy and an air source heat pump as heat sources is developed, and the purpose of the hot water system is to make up for the shortages and make the solar energy and the air source heat pump mutually complement each other and mutually reserve. However, the existing solar energy and the solar heat collection system and the air source heat pump system in the air source heat pump system operate independently, namely, the solar heat collection system is used as a standby heat source or the air source heat pump system is used as a standby heat source, and the application of the system is also influenced by the air source heat pump.
Disclosure of Invention
The invention aims to provide a solar energy and air source heat pump hot water system which has a simple structure and low energy consumption and can realize stable heat supply under different weather conditions, and a control method thereof, so as to overcome the defects of the prior art.
The technical scheme of the invention is as follows: a solar energy and air source heat pump hot water system comprises a hot water reservoir, a solar energy hot water system for supplying heat to the hot water reservoir and an air source heat pump hot water system with double evaporators; the solar water heating system sequentially comprises a water heating system circulating water pump, a third electromagnetic valve, a solar heat collecting system circulating water pump, a solar heat collector, a sixth electromagnetic valve and related connecting pipelines in series; a first water/water heat exchanger is connected in parallel between the solar heat collection system circulating water pump and the third electromagnetic valve and between the solar heat collector and the sixth electromagnetic valve, and a second water/water heat exchanger is connected in parallel between the hot water system circulating water pump and the third electromagnetic valve and between the sixth electromagnetic valve and the hot water reservoir; the input end and the output end of the first water/water heat exchanger are respectively provided with a first electromagnetic valve and a second electromagnetic valve, and the input end and the output end of the second water/water heat exchanger are respectively provided with a ninth electromagnetic valve and a tenth electromagnetic valve;
the double-evaporator air source heat pump hot water system comprises a first evaporator and a condenser, wherein the first evaporator exchanges heat with a first water/water heat exchanger, the condenser exchanges heat with a second water/water heat exchanger, the air/water heat exchanger is connected in parallel in a loop formed by the first evaporator and the condenser, and the air/water heat exchanger exchanges heat with air through the second evaporator; the output end of the condenser is connected with the input end of the electronic expansion valve, the output end of the electronic expansion valve is respectively connected with the input ends of the first evaporator and the second evaporator, the input end of the condenser is connected with the output end of the compressor, and the input end of the compressor is respectively connected with the output ends of the first evaporator and the second evaporator; the input ends of the first evaporator and the second evaporator are respectively provided with a fourth electromagnetic valve and a seventh electromagnetic valve, and the output ends of the first evaporator and the second evaporator are respectively provided with a fifth electromagnetic valve and an eighth electromagnetic valve;
the solar heat collector is a flat tracking type heat collector or a vacuum tube tracking type heat collector;
the compressor is controlled by a variable frequency system;
a control method of a solar energy and air source heat pump hot water system comprises the following working conditions:
working condition one: solar water heating system for supplying heat alone
When the outdoor solar energy is sufficient, the heat provided by the sun can heat the hot water in the hot water storage to the set temperature, the solar water heating system can be used for independently supplying heat, namely, the water in the hot water storage is heated through the solar heat collector, the heated hot water returns to the hot water storage through the sixth electromagnetic valve, so that the water temperature in the hot water storage is continuously increased until the hot water in the hot water storage reaches the set temperature, and at the moment, the circulating water pump of the hot water system and the circulating water pump of the solar heat collection system stop working;
working condition II: independent heat supply of air source heat pump water heating system
When the outdoor air temperature is greater than 0 ℃ and the solar energy is seriously insufficient, the heat provided by the sun can not heat the water in the hot water storage to the set temperature, the air source heat pump hot water system can be used for independently supplying heat, namely, the water in the hot water storage is conveyed to the second water/water heat exchanger through the hot water system circulating water pump and is subjected to heat exchange with the condenser, and then returns to the hot water storage through the tenth electromagnetic valve, so that the water temperature in the hot water storage is continuously increased until the water in the hot water storage is heated to the set temperature, and at the moment, the hot water system circulating water pump and the compressor stop working.
And (3) working condition III: auxiliary heating of solar water heating system
Under the conditions that the outdoor temperature is lower than 0 ℃ and the solar energy is relatively insufficient, the air source heat pump water heating system can be used as a main heat source, the solar water heating system is used as an auxiliary heat source, namely, the solar water heating system is used for defrosting an evaporator of the air source heat pump water heating system, and the operation energy efficiency ratio of the air source heat pump water heating system is improved; the water in the hot water storage is continuously conveyed into the second water/water heat exchanger by the hot water system circulating water pump and exchanges heat with the refrigerant in the condenser, the heated water returns into the hot water storage through the tenth electromagnetic valve, and the circulation is performed, so that the water temperature in the hot water storage is continuously increased until the water in the hot water storage is heated to the set temperature, and at the moment, the hot water system circulating water pump, the solar heat collection system circulating water pump and the compressor stop working;
and (4) working condition four: auxiliary heating of air source heat pump hot water system
The outdoor temperature is lower than 0 ℃ and the solar energy is relatively sufficient, but the water in the hot water storage can not be heated to the set temperature by completely relying on the heat provided by the solar energy, at the moment, the solar water heating system can be used as a main heat source, and the air source heat pump water heating system can be used as an auxiliary heat source; the water of the hot water storage is continuously conveyed to the solar heat collector by the hot water system circulating water pump to be heated, part of hot water coming out of the solar heat collector is directly returned to the hot water storage through the sixth electromagnetic valve to be continuously circulated, the other part of hot water is subjected to defrosting treatment on the first evaporator of the air source heat pump hot water system, the heat obtained by the air source heat pump hot water system is transmitted to the backwater of the hot water storage through the condenser in the second water/water heat exchanger, the heated backwater is returned to the hot water storage, and the circulation is performed in such a way that the water temperature in the hot water storage is continuously increased until the water in the hot water storage is heated to the set temperature, and at the moment, the hot water system circulating water pump, the solar heat collection system circulating water pump and the compressor stop working;
working condition five: solar water heating system and air source heat pump water heating system combined heat supply
Under the conditions that the outdoor air temperature is higher than 0 ℃ and the solar energy is relatively insufficient, the solar water heating system and the air source heat pump water heating system can be combined for supplying heat to the hot water storage, so that the energy consumption for supplying heat by independently using the air source heat pump water heating system is reduced; the water of the hot water reservoir is continuously conveyed to the solar heat collector and the second water/water heat exchanger to be heated through the circulating water pump of the hot water system, the hot water coming out of the solar heat collector is directly returned to the hot water reservoir through the sixth electromagnetic valve to be continuously circulated, and meanwhile, the hot water is returned to the hot water reservoir through the tenth electromagnetic valve to be continuously circulated through the circulating water pump of the hot water system; the two hot water heating cycles are repeated continuously, so that the water temperature in the hot water storage is increased continuously until the water in the hot water storage is heated to the set temperature, and at the moment, the circulating water pump of the hot water system, the circulating water pump of the solar heat collection system and the compressor stop working.
A temperature sensor is arranged in the hot water storage device.
The invention has the advantages that: according to the invention, the solar water heating system and the air source heat pump water heating system are organically combined, so that the solar water heating system and the air source heat pump water heating system can be adopted for supplying heat singly, complementarily or jointly according to different weather conditions, the efficient utilization of solar energy is realized, the working efficiency of the air source heat pump is improved, and the energy consumption is saved. Meanwhile, the invention effectively solves the problem of hot water supply when the ambient temperature is low or the solar energy is insufficient, and ensures the normal supply of hot water all the year round.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Reference numerals illustrate: 1-solar heat collection system circulating water pump, 2-solar heat collector, 3-first solenoid valve, 4-first water/water heat exchanger, 5-second solenoid valve, 6-third solenoid valve, 7-fourth solenoid valve, 8-fifth solenoid valve, 9-sixth solenoid valve, 10-first evaporator, 11-air/water heat exchanger, 12-seventh solenoid valve, 13-eighth solenoid valve, 14-ninth solenoid valve, 15-second evaporator, 16-compressor, 17-condenser, 18-electronic expansion valve, 19-second water/water heat exchanger, 20-tenth solenoid valve, 21-hot water system circulating water pump, 22-hot water reservoir.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings.
Referring to fig. 1, a solar energy and air source heat pump water heating system of the present invention includes a water heating reservoir 22, a solar energy water heating system for supplying heat to the water heating reservoir 22, and an air source heat pump water heating system with double evaporators; the solar water heating system sequentially comprises a water heating system circulating water pump 21, a third electromagnetic valve 6, a solar heat collecting system circulating water pump 1, a solar heat collector 2, a sixth electromagnetic valve 9 and related connecting pipelines which are connected in series, wherein the solar heat collector 2 is a flat tracking type heat collector or a vacuum tube tracking type heat collector, so that the solar heat collector 2 can be automatically adjusted according to the deflection of the sun in different seasons; a first water/water heat exchanger 4 is connected in parallel between the solar heat collection system circulating water pump 1 and the third electromagnetic valve 6 and between the solar heat collector 2 and the sixth electromagnetic valve 9, and a second water/water heat exchanger 19 is connected in parallel between the hot water circulating water pump 21 and the third electromagnetic valve 6 and between the sixth electromagnetic valve 9 and the hot water reservoir 22; a first electromagnetic valve 3 and a second electromagnetic valve 5 are respectively arranged at the input end and the output end of the first water/water heat exchanger 4, and a ninth electromagnetic valve 14 and a tenth electromagnetic valve 20 are respectively arranged at the input end and the output end of the second water/water heat exchanger 19;
the double-evaporator air source heat pump hot water system comprises a first evaporator 10 for exchanging heat with a first water/water heat exchanger 4 and a condenser 17 for exchanging heat with a second water/water heat exchanger 19, wherein an air/water heat exchanger 11 is connected in parallel in a loop formed by the first evaporator 10 and the condenser 17, and the air/water heat exchanger 11 exchanges heat with air through the second evaporator 15; the output end of the condenser 17 is connected with the input end of the electronic expansion valve 18, the output end of the electronic expansion valve 18 is respectively connected with the input ends of the first evaporator 10 and the second evaporator 15, the input end of the condenser 17 is connected with the output end of the compressor 16, and the input end of the compressor 16 is respectively connected with the output ends of the first evaporator 10 and the second evaporator 15; the input ends of the first evaporator 10 and the second evaporator 15 are respectively provided with a fourth electromagnetic valve 7 and a seventh electromagnetic valve 12, and the output ends of the first evaporator 10 and the second evaporator 15 are respectively provided with a fifth electromagnetic valve 8 and an eighth electromagnetic valve 13; the compressor 16 is controlled by a variable frequency system, so that different power outputs are adopted under different working conditions, and energy consumption is saved.
When the invention is embodied, the control can be carried out according to different working conditions:
working condition one: solar water heating system for supplying heat alone
When the outdoor solar energy is sufficient and the heat provided by the sun can heat the hot water in the hot water reservoir 22 to the set temperature, the hot water can be independently supplied by the solar water heating system, and the specific operation is as follows: starting a circulating water pump 21 of a hot water system, a third electromagnetic valve 6, a circulating water pump 1 of a solar heat collecting system and a sixth electromagnetic valve 9, and closing the first electromagnetic valve 3, the second electromagnetic valve 5, a ninth electromagnetic valve 14, a tenth electromagnetic valve 20, a fourth electromagnetic valve 7, a fifth electromagnetic valve 8, a seventh electromagnetic valve 12, an eighth electromagnetic valve 13 and a compressor 16; at this time, the water in the hot water reservoir 22 is pressurized by the hot water system circulating water pump 21 and the third electromagnetic valve 6 and then enters the solar heat collector 2 for heating by the solar heat collector circulating water pump 1, the heated hot water returns to the hot water reservoir 22 by the sixth electromagnetic valve 9, and circulates in such a way that the water temperature in the hot water reservoir 22 is continuously increased until the hot water in the hot water reservoir 22 reaches the set temperature (the temperature is detected by the temperature sensor arranged in the hot water reservoir 22), and at this time, the hot water system circulating water pump 21 and the solar heat collector circulating water pump 1 stop working;
working condition II: independent heat supply of air source heat pump water heating system
When the outdoor air temperature is greater than 0 ℃ and the solar energy is seriously insufficient, and the heat provided by the sun can not heat the water in the hot water storage 22 to the set temperature, the water can be independently supplied by the air source heat pump hot water system, and the specific operation is as follows: the seventh electromagnetic valve 12, the eighth electromagnetic valve 13, the compressor 16, the ninth electromagnetic valve 14, the tenth electromagnetic valve 20 and the circulating water pump 21 of the hot water system are opened, and the third electromagnetic valve 6, the sixth electromagnetic valve 9, the first electromagnetic valve 3, the second electromagnetic valve 5 and the circulating water pump 1 of the solar heat collecting system are closed; at this time, the refrigerant is sent into the condenser 17 through the compressor 16, the refrigerant transfers heat to the water in the second water/water heat exchanger 19, then condenses, and increases the water temperature, then sends the refrigerant into the second evaporator 15 through the electronic expansion valve 18 and the seventh electromagnetic valve 12, the refrigerant evaporates and absorbs heat in the second evaporator 15 to gasify, and the gasified refrigerant is sucked into the compressor 16 again through the eighth electromagnetic valve 13 and then starts a new cycle; meanwhile, the water in the hot water reservoir 22 is delivered to the second water/water heat exchanger 19 through the hot water system circulating water pump 21, and after heat exchange with the condenser 17, the water is returned to the hot water reservoir 22 through the tenth electromagnetic valve 20, and circulated in such a way, the water temperature in the hot water reservoir 22 is continuously increased until the water in the hot water reservoir 22 is heated to its set temperature (the temperature is detected by the temperature sensor provided in the hot water reservoir 22), at which time, the hot water system circulating water pump 21 and the compressor 16 are stopped.
And (3) working condition III: auxiliary heating of solar water heating system
Under the conditions that the outdoor temperature is lower than 0 ℃ and the solar energy is relatively insufficient, the air source heat pump water heating system can be used as a main heat source, the solar water heating system is used as an auxiliary heat source, namely, the solar water heating system is used for defrosting an evaporator of the air source heat pump water heating system, and the operation energy efficiency ratio of the air source heat pump water heating system is improved; the specific operation is as follows: the fifth electromagnetic valve 8, the fourth electromagnetic valve 7, the compressor 16, the solar heat collection system circulating water pump 1, the first electromagnetic valve 3, the second electromagnetic valve 5, the hot water system circulating water pump 21, the ninth electromagnetic valve 14 and the tenth electromagnetic valve 20 are opened, and the third electromagnetic valve 6, the sixth electromagnetic valve 9, the seventh electromagnetic valve 12 and the eighth electromagnetic valve 13 are closed; at this time, the refrigerant is sent into the condenser 17 through the compressor 16, the refrigerant is condensed after exchanging heat with the water in the second water/water heat exchanger 19 through the condenser 17, the condensed refrigerant enters the first evaporator 10 through the electronic expansion valve 18 and the fourth electromagnetic valve 7, and absorbs the heat brought by the first water/water heat exchanger 4 to gasify, the first evaporator 10 is defrosted in the process of gasifying and absorbing heat, and the gasified refrigerant is sucked by the compressor 16 and starts a new cycle; meanwhile, the water in the hot water storage 22 is continuously conveyed into the second water/water heat exchanger 19 by the hot water system circulating water pump 21 and exchanges heat with the refrigerant in the condenser 17, the heated water is returned into the hot water storage 22 through the tenth electromagnetic valve 20, and is circulated in such a way that the water temperature in the hot water storage 22 is continuously increased until the water in the hot water storage 22 is heated to the set temperature (the temperature is detected by the temperature sensor arranged in the hot water storage 22), and at the moment, the hot water system circulating water pump 21, the solar heat collecting system circulating water pump 1 and the compressor 16 are stopped;
and (4) working condition four: auxiliary heating of air source heat pump hot water system
The outdoor temperature is lower than 0 ℃ and the solar energy is relatively sufficient, but the water in the hot water storage 22 cannot be heated to the set temperature by the heat provided by the solar energy, and the solar water heating system can be used as a main heat source and the air source heat pump water heating system can be used as an auxiliary heat source; the specific operation is as follows: starting a solar heat collection system circulating water pump 1, a third electromagnetic valve 6, a first electromagnetic valve 3, a second electromagnetic valve 5, a hot water system circulating water pump 21, a sixth electromagnetic valve 9, a ninth electromagnetic valve 14, a tenth electromagnetic valve 20, a compressor 16, a fourth electromagnetic valve 7 and a fifth electromagnetic valve 8, and closing a seventh electromagnetic valve 12 and an eighth electromagnetic valve 13; at this time, after the refrigerant of the air source heat pump hot water system exchanges heat in the condenser 17, the refrigerant enters the compressor 16 through the electronic expansion valve 18, the fourth electromagnetic valve 7, the first evaporator 10 and the fifth electromagnetic valve 8, and a new heat pump cycle is started; meanwhile, the water of the hot water reservoir 22 is continuously conveyed to the solar heat collector 2 to be heated by the hot water system circulating water pump 21, part of hot water coming out of the solar heat collector 2 directly returns to the hot water reservoir 22 through the sixth electromagnetic valve 9 to continue circulation, and the other part of hot water enters the first water/water heat exchanger 4 through the first electromagnetic valve 3 to defrost the first evaporator 10 of the air source heat pump hot water system, and the hot water after heat exchange is conveyed to the solar heat collector 2 again through the second electromagnetic valve 5 and the solar heat collector system circulating water pump 1 to be circularly heated; the heat obtained by the air source heat pump water heating system transfers heat to the backwater of the hot water storage 22 through the condenser 17 in the second water/water heat exchanger 19, the solar water heating system is assisted to heat the hot water storage 22, the heated hot water is returned to the hot water storage 22 through the tenth electromagnetic valve 20, and the circulation is performed, so that the water temperature in the hot water storage 22 is continuously increased until the water in the hot water storage 22 is heated to the set temperature (the temperature is detected through the temperature sensor arranged in the hot water storage 22), and at the moment, the water circulating pump 21 of the hot water system, the circulating pump 1 of the solar heat collecting system and the compressor 16 stop working;
working condition five: solar water heating system and air source heat pump water heating system combined heat supply
Under the conditions that the outdoor air temperature is higher than 0 ℃ and the solar energy is relatively insufficient, the solar water heating system and the air source heat pump water heating system can be combined for supplying heat to the hot water storage 22, so that the energy consumption for supplying heat by independently using the air source heat pump water heating system is reduced; the specific operation mode is as follows: starting a solar heat collection system circulating water pump 1, a third electromagnetic valve 6, a hot water system circulating water pump 21, a sixth electromagnetic valve 9, a ninth electromagnetic valve 14, a tenth electromagnetic valve 20, a compressor 16, a seventh electromagnetic valve 12 and an eighth electromagnetic valve 13, and closing a fourth electromagnetic valve 7, a fifth electromagnetic valve 8, a first electromagnetic valve 3 and a second electromagnetic valve 5; at this time, after the refrigerant of the air source heat pump hot water system exchanges heat in the condenser 17, the refrigerant enters the compressor 16 through the electronic expansion valve 18, the fourth electromagnetic valve 7, the first evaporator 10 and the fifth electromagnetic valve 8, and a new heat pump cycle is started; meanwhile, the water of the hot water reservoir 22 is continuously conveyed to the solar heat collector 2 and the second water/water heat exchanger 19 for heating through the hot water system circulating water pump 21, the hot water coming out of the solar heat collector 2 is directly returned to the hot water reservoir 22 through the sixth electromagnetic valve 9 for continuous circulation, and meanwhile, the hot water is returned to the hot water reservoir 22 through the tenth electromagnetic valve 20 in the second water/water heat exchanger 19 for continuous circulation through the hot water system circulating water pump 21; the two hot water heating cycles are repeated continuously, so that the water temperature in the hot water reservoir 22 is increased continuously until the water in the hot water reservoir 22 is heated to the set temperature (the temperature is detected by a temperature sensor arranged in the hot water reservoir 22), and at this time, the hot water system circulating water pump 21, the solar heat collecting system circulating water pump 1 and the compressor 16 are stopped.
Claims (4)
1. The control method of the solar energy and air source heat pump water heating system is characterized in that the solar energy and air source heat pump water heating system comprises a hot water storage (22), a solar energy water heating system for supplying heat to the hot water storage (22) and an air source heat pump water heating system with double evaporators; the solar water heating system sequentially comprises a water heating system circulating water pump (21), a third electromagnetic valve (6), a solar heat collecting system circulating water pump (1), a solar heat collector (2), a sixth electromagnetic valve (9) and related connecting pipelines in series; a first water/water heat exchanger (4) is connected in parallel between the solar heat collection system circulating water pump (1) and the third electromagnetic valve (6) and between the solar heat collector (2) and the sixth electromagnetic valve (9), and a second water/water heat exchanger (19) is connected in parallel between the hot water system circulating water pump (21) and the third electromagnetic valve (6) and between the sixth electromagnetic valve (9) and the hot water storage (22); the input end and the output end of the first water/water heat exchanger (4) are respectively provided with a first electromagnetic valve (3) and a second electromagnetic valve (5), and the input end and the output end of the second water/water heat exchanger (19) are respectively provided with a ninth electromagnetic valve (14) and a tenth electromagnetic valve (20); the double-evaporator air source heat pump hot water system comprises a first evaporator (10) for exchanging heat with a first water/water heat exchanger (4) and a condenser (17) for exchanging heat with a second water/water heat exchanger (19), wherein an air/water heat exchanger (11) is connected in parallel in a loop formed by the first evaporator (10) and the condenser (17), and the air/water heat exchanger (11) exchanges heat with air through a second evaporator (15); the output end of the condenser (17) is connected with the input end of the electronic expansion valve (18), the output end of the electronic expansion valve (18) is respectively connected with the input ends of the first evaporator (10) and the second evaporator (15), the input end of the condenser (17) is connected with the output end of the compressor (16), and the input end of the compressor (16) is respectively connected with the output ends of the first evaporator (10) and the second evaporator (15); the input ends of the first evaporator (10) and the second evaporator (15) are respectively provided with a fourth electromagnetic valve (7) and a seventh electromagnetic valve (12), and the output ends of the first evaporator (10) and the second evaporator (15) are respectively provided with a fifth electromagnetic valve (8) and an eighth electromagnetic valve (13);
the control method comprises the following working conditions:
working condition one: solar water heating system for supplying heat alone
When the outdoor solar energy is sufficient, the heat provided by the sun can heat the hot water in the hot water storage (22) to the set temperature, the solar water heating system can be used for independently heating, namely, the water in the hot water storage (22) is heated through the solar heat collector (2), the heated hot water returns to the hot water storage (22) through the sixth electromagnetic valve (9), the circulation is performed, the water temperature in the hot water storage (22) is continuously increased until the hot water in the hot water storage (22) reaches the set temperature, and at the moment, the hot water system circulating water pump (21) and the solar heat collection system circulating water pump (1) stop working;
working condition II: independent heat supply of air source heat pump water heating system
When the outdoor air temperature is higher than 0 ℃ and the solar energy is seriously insufficient, the heat provided by the sun can not heat the water in the hot water storage (22) to the set temperature, the air source heat pump hot water system can be used for independently supplying heat, namely, the water in the hot water storage (22) is conveyed into the second water/water heat exchanger (19) through the hot water system circulating water pump (21) and is subjected to heat exchange with the condenser (17), and then returns into the hot water storage (22) through the tenth electromagnetic valve (20) for circulation, so that the water temperature in the hot water storage (22) is continuously increased until the water in the hot water storage (22) is heated to the set temperature, and at the moment, the hot water system circulating water pump (21) and the compressor (16) are stopped in operation,
and (3) working condition III: auxiliary heating of solar water heating system
Under the conditions that the outdoor temperature is lower than 0 ℃ and the solar energy is relatively insufficient, the air source heat pump water heating system can be used as a main heat source, the solar water heating system is used as an auxiliary heat source, namely, the solar water heating system is used for defrosting an evaporator of the air source heat pump water heating system, and the operation energy efficiency ratio of the air source heat pump water heating system is improved; the water in the hot water storage (22) is continuously conveyed into the second water/water heat exchanger (19) by the hot water system circulating water pump (21), heat exchange is carried out between the water and the refrigerant in the condenser (17), the heated water returns into the hot water storage (22) through the tenth electromagnetic valve (20), the water is circulated in such a way, the water temperature in the hot water storage (22) is continuously increased until the water in the hot water storage (22) is heated to the set temperature, and at the moment, the hot water system circulating water pump (21), the solar heat collection system circulating water pump (1) and the compressor (16) stop working;
and (4) working condition four: the air source heat pump water heating system is used for auxiliary heating, the outdoor temperature is lower than 0 ℃, the solar energy is relatively sufficient, but the water in the water heating storage (22) cannot be heated to the set temperature by completely relying on the heat provided by the solar energy, and the solar energy water heating system can be used as a main heat source and the air source heat pump water heating system can be used as an auxiliary heat source; the water of the hot water storage (22) is continuously conveyed to the solar heat collector (2) by the hot water system circulating water pump (21), part of the hot water coming out of the solar heat collector (2) is directly returned to the hot water storage (22) through the sixth electromagnetic valve (9) to continue circulating, the other part of the hot water is defrosted by the first evaporator (10) of the air source heat pump hot water system, the heat obtained by the air source heat pump hot water system is transferred to the backwater of the hot water storage (22) through the condenser (17) in the second water/water heat exchanger (19), the heated backwater is returned to the hot water storage (22), and the circulation is performed in such a way that the water temperature in the hot water storage (22) is continuously increased until the water in the hot water storage (22) is heated to the set temperature, and at the moment, the hot water system circulating water pump (21), the solar heat collection system circulating water pump (1) and the compressor (16) stop working;
working condition five: solar water heating system and air source heat pump water heating system combined heat supply
Under the conditions that the outdoor air temperature is higher than 0 ℃ and the solar energy is relatively insufficient, the solar water heating system and the air source heat pump water heating system can be combined for supplying heat to the hot water storage (22), so that the energy consumption for supplying heat by independently using the air source heat pump water heating system is reduced; the water of the hot water reservoir (22) is continuously conveyed to the solar heat collector (2) and the second water/water heat exchanger (19) through the hot water system circulating water pump (21), the hot water coming out of the solar heat collector (2) is directly returned to the hot water reservoir (22) through the sixth electromagnetic valve (9) to be continuously circulated, and meanwhile, the hot water is returned to the hot water reservoir (22) through the tenth electromagnetic valve (20) in the second water/water heat exchanger (19) through the hot water system circulating water pump (21); the two hot water heating cycles are repeated continuously, so that the water temperature in the hot water storage (22) is increased continuously until the water in the hot water storage (22) is heated to the set temperature, and at the moment, the hot water system circulating water pump (21), the solar heat collection system circulating water pump (1) and the compressor (16) stop working.
2. The method for controlling a solar and air source heat pump water heating system according to claim 1, wherein: the solar heat collector (2) is a flat tracking type heat collector or a vacuum tube tracking type heat collector.
3. The method for controlling a solar and air source heat pump water heating system according to claim 1, wherein: the compressor (16) is controlled by a variable frequency system.
4. The method for controlling a solar and air source heat pump water heating system according to claim 1, wherein: a temperature sensor is arranged in the hot water reservoir (22).
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| CN107178903A (en) * | 2016-03-09 | 2017-09-19 | 青岛海尔新能源电器有限公司 | Solar heat pump water heating apparatus and its control method |
| CN108870742A (en) * | 2017-05-10 | 2018-11-23 | 青岛经济技术开发区海尔热水器有限公司 | A kind of novel Double energy source water heating system and control method |
| WO2019005678A1 (en) * | 2017-06-27 | 2019-01-03 | Imby Energy, Inc. | Cogeneration systems and methods for generating heating and electricity |
| CN110068038B (en) * | 2019-03-19 | 2021-05-11 | 南京航空航天大学 | Solar energy or air energy combined heat and power system and method thereof |
| CN113587203A (en) * | 2021-07-23 | 2021-11-02 | 西安石油大学 | Multi-module combined control solar-heat pump composite heat collection system based on PLC |
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