A kind of heat pump energy-storage system for stabilizing intermittent energy short-term fluctuationTechnical field
The present invention relates to heat reclamation type heat pump systems, store up more particularly to a kind of heat pump for stabilizing intermittent energy short-term fluctuationIt can system.
Background technique
Since the use of traditional energy can cause the environmental problems such as greenhouse effects, atmosphere pollution, the cleanings energy such as photovoltaic power generationThe usage amount in source is being substantially increased.Currently, the electrical appliances power supply such as household electrical appliances given in life by photovoltaic power generation becomes utilization sideOne of formula.
Heat pump can make heat by inverse endless form as a kind of efficient energy-saving device for making full use of low grade heat energyIt high temp objects is flowed to from cryogenic object, consume a small amount of mechanical work, obtains biggish heat, it can be effectively difficult to applyLow grade heat energy, which uses, reaches energy saving purpose.
But there is self problems for photovoltaic generating system: output electric energy by the environment such as intensity of illumination, temperature fluctuation becauseThe influence of element, will appear biggish fluctuation in a short time.Currently, some heat pumps are used by photovoltaic power generation and battery joint power supplyFlap portion is filled in battery by mode when photovoltaic power generation output power is greater than compressor nominal operation power.Work as photovoltaicWhen the output power that generates electricity is less than compressor nominal operation power, compensated using the electricity in battery.Due to filling for batteryElectricity and discharge process have the loss of power to have larger so that heat pump system is unable to fully utilize for the power of photovoltaic power generationPart wastes.Therefore, it is necessary to solve the problems, such as that heat pump system is low to photovoltaic generation power utilization rate in a short time.
Further more, normal domestic use formula air-conditioning mostly uses the heat pump type air conditioner of no heat reclamation type, certain defective there is:In summer, the indoor unit of air-conditioning produces cooling capacity, and heat is discharged in air by outdoor unit, this partial condensation heat not only cannot getIt is effective to utilize, and waste heat can aggravate the tropical island effect in city into air.It is therefore desirable to solve common heat pump type air conditionerThe problem low to condensation heat utilization efficiency.
Also need to solve the equilibrium problem of refrigerated medium heat in improvement: in some heat reclamation type heat pump air conditioners, alwaysCooling and warming is kept to run simultaneously, evaporator absorbs heat, water heat release of the condenser into hot-water cylinder from water pot.But whenWhen meeting hot and cold water temperature requirements simultaneously, compared with common Teat pump boiler, evaporating temperature is lower, with common refrigeration air-conditioner workCondition is compared, and condensation temperature is higher, is caused the refrigeration of unit and heating efficiency to reduce, is consumed energy larger.
Summary of the invention
Goal of the invention: the object of the present invention is to provide a kind of heat pump energy-storage system for stabilizing intermittent energy short-term fluctuation, solutionsDetermined it is existing in the prior art it is low to photovoltaic generation power utilization rate in a short time, refrigeration is low with heating efficiency, energy consumption is bigProblem.
Technical solution: to reach this purpose, the invention adopts the following technical scheme:
The heat pump energy-storage system of the present invention for stabilizing intermittent energy short-term fluctuation, including water pot energy storage-taking energy unit,Water pot energy storage-taking energy unit includes hot-water cylinder and cold water tank, and hot-water cylinder connects floor heating hot water unit and domestic hot-water's unit, hot waterTank is also connected with heat-recovery condenser unit, and heat-recovery condenser unit connects double evaporators list with expansion valve by frequency-changeable compressorMember, double evaporators unit connect cold water tank, air-conditioning unit in cold water tank junction chamber；The heat pump energy-storage system further includes controlUnit processed, control unit are separately connected room air and adjust unit, water pot energy storage-taking energy unit, double evaporators unit, recuperation of heatCondenser unit and frequency-changeable compressor.
Further, the heat pump energy-storage system further includes the first solenoid valve and water pump, and water pot energy storage-taking energy unit further includesVariable frequency pump and variable frequency pump, the first output end and first input end of cold water tank are separately connected room air and adjust unit, coldSecond input terminal of water pot connects double evaporators unit, and the second output terminal of cold water tank connects double evaporators list by variable frequency pumpThe first input end of member, hot-water cylinder connects heat-recovery condenser unit, the first output end connection of hot-water cylinder by variable frequency pumpHeat-recovery condenser unit, the second output terminal of hot-water cylinder are separately connected the input terminal and first solenoid valve of domestic hot-water's unitOne end, the input terminal of the other end connection floor heating hot water unit of the first solenoid valve, the second input terminal of hot-water cylinder are connected by water pumpIt delivers a child the output end of hot water unit living and the output end of floor heating hot water unit.
Further, the double evaporators unit includes plate heat exchanger, and the first refrigerating medium output end of plate heat exchanger connectsThe second input terminal of cold water tank is connect, the first refrigerating medium input terminal of plate heat exchanger connects variable frequency pump, and the first of cold water tank is defeatedOutlet and first input end are separately connected room air and adjust unit, and the first output of condenser of plate heat exchanger is separately connectedFirst refrigerant input terminal of the output end of the input terminal of frequency-changeable compressor and air-cooled finned heat exchanger, plate heat exchanger passes throughOne end of third solenoid valve and one end of expansion valve are separately connected after second solenoid valve, the other end connection of third solenoid valve is air-cooledThe input terminal of formula finned heat exchanger, the side of air-cooled finned heat exchanger are equipped with constant-speed fan, and the other end of expansion valve connects heatRecycle condenser unit.
Further, the heat-recovery condenser unit includes plate heat exchanger, the second refrigerant input of plate heat exchangerThe output end of end connection frequency-changeable compressor, the second refrigerant output end of plate heat exchanger connect the defeated of air-cooled finned heat exchangerEnter end, the other end of the output end connection expansion valve of air-cooled finned heat exchanger, the side of air-cooled finned heat exchanger, which is equipped with, to be becomeSecond refrigerating medium output end of frequency fan, plate heat exchanger connects variable frequency pump, the second refrigerating medium input terminal of plate heat exchangerConnect the first output end of hot-water cylinder.
Further, it includes air-cooled finned heat exchanger that the room air, which adjusts unit, air-cooled finned heat exchanger it is defeatedOutlet connects the first input end of cold water tank by variable frequency pump, and the of the input terminal connection cold water tank of air-cooled finned heat exchangerThe side of one output end, air-cooled finned heat exchanger is equipped with variable-frequency fan.
Further, described control unit includes controller, the temperature signal probe in room air, is set to cold water tankIn temperature signal probe and the temperature signal probe in hot-water cylinder, controller is separately connected third solenoid valve, secondSolenoid valve, the first solenoid valve, variable-frequency fan, variable-frequency fan, variable frequency pump, variable frequency pump, variable frequency pump, frequency-changeable compressor.
Further, described control unit controls second solenoid valve unlatching, third solenoid valve and the first solenoid valve in summerBe turned off, in winter when control third solenoid valve open, second solenoid valve close, the first solenoid valve open.
The utility model has the advantages that the invention discloses a kind of heat pump energy-storage systems for stabilizing intermittent energy short-term fluctuation, with existing skillArt is compared, have it is following the utility model has the advantages that
(1) using renewable intermittent energy sources such as frequency-changeable compressor consumption wind, light, interval performance in a short time is not only eliminatedThe fluctuation bring in source influences, and provides cooling and heating load, energy saving for user；
(2) it is powered using the output power of photovoltaic power generation directly to frequency-changeable compressor, with conventional photovoltaic power generation and batteryThe mode of joint power supply is compared, and can effectively be improved in a short time to the utilization rate of the output power of photovoltaic power generation, be reduced electricityPower loss；
(3) waste heat of traditional air conditioner has been recycled, heat hot water has been used for, has saved the energy consumption of heat hot water and be beneficial to slow downUrban heat land effect；
(4) refrigerant first passes through plate heat exchanger and exchanges heat with the water in hot-water cylinder, the temperature of water in heat hot water tank,Overall refrigerating effect on the basis of guaranteeing total heating capacity, is improved to secondary heat dissipation is carried out by air cooled condenser again；
(5) different recuperation of heat operational modes is used whether room according to user, so that the system under single operational modeCold, heating efficiency improves.
Detailed description of the invention
Fig. 1 is the schematic diagram of system in the specific embodiment of the invention；
Fig. 2 is the schematic diagram of photovoltaic power generation short-term fluctuation characteristic in the specific embodiment of the invention；
Fig. 3 is room temperature change curve in the specific embodiment of the invention；
Fig. 4 is the voltage change curve of the adjusting revolving speed of variable-frequency fan in the specific embodiment of the invention；
Fig. 5 is the voltage change curve of the adjusting revolving speed of frequency-changeable compressor in the specific embodiment of the invention；
Fig. 6 is cold water tank water temperature change curve in the specific embodiment of the invention.
Specific embodiment
Technical solution of the present invention is further introduced With reference to embodiment.
Present embodiment discloses a kind of heat pump energy-storage system for stabilizing intermittent energy short-term fluctuation, as shown in Figure 1,Including water pot energy storage-taking energy unit, water pot energy storage-taking energy unit includes hot-water cylinder 17 and cold water tank 3, and hot-water cylinder 17 connects floor heatingHot water unit and domestic hot-water's unit, hot-water cylinder 17 are also connected with heat-recovery condenser unit, and heat-recovery condenser unit passes through changeFrequency compressor 20 and expansion valve 11 connect double evaporators unit, and double evaporators unit connects cold water tank 3, in 3 junction chamber of cold water tankAir-conditioning unit；The heat pump energy-storage system further includes control unit, control unit be separately connected room air adjust unit,Water pot energy storage-taking energy unit, double evaporators unit, heat-recovery condenser unit and frequency-changeable compressor 20.
Heat pump energy-storage system further includes the first solenoid valve 14 and water pump 19, and water pot energy storage-taking energy unit further includes frequency conversion waterPump 16 and variable frequency pump 5, the first output end and first input end of cold water tank 3 are separately connected room air and adjust unit, cold waterSecond input terminal of tank 3 connects double evaporators unit, and the second output terminal of cold water tank 3 connects double evaporators by variable frequency pump 5The first input end of unit, hot-water cylinder 17 connects heat-recovery condenser unit by variable frequency pump 16, and the first of hot-water cylinder 17 is defeatedOutlet connects heat-recovery condenser unit, and the second output terminal of hot-water cylinder 17 is separately connected the input terminal and the of domestic hot-water's unitOne end of one solenoid valve 14, the input terminal of the other end connection floor heating hot water unit of the first solenoid valve 14, the second of hot-water cylinder 17Input terminal connects the output end of domestic hot-water's unit and the output end of floor heating hot water unit by water pump 19.
Double evaporators unit includes plate heat exchanger 6, and the first refrigerating medium output end of plate heat exchanger 6 connects cold water tank 3The second input terminal, the first refrigerating medium input terminal of plate heat exchanger 6 connects variable frequency pump 5, the first output end of cold water tank 3 andFirst input end is separately connected room air and adjusts unit, and the first output of condenser of plate heat exchanger 6 is separately connected frequency conversionFirst refrigerant input terminal of the output end of the input terminal of compressor 20 and air-cooled finned heat exchanger 8, plate heat exchanger 6 passes throughOne end of third solenoid valve 9 and one end of expansion valve 11 are separately connected after second solenoid valve 10, the other end of third solenoid valve 9 connectsGive a dinner for a visitor from afar the input terminal of cold type finned heat exchanger 8, the side of air-cooled finned heat exchanger 8 is equipped with constant-speed fan 7, expansion valve 11 it is anotherOne end connects heat-recovery condenser unit.
Heat-recovery condenser unit includes plate heat exchanger 15, and the second refrigerant input terminal of plate heat exchanger 15, which connects, to be becomeThe output end of frequency compressor 20, the second refrigerant output end of plate heat exchanger 15 connect the input of air-cooled finned heat exchanger 13End, the other end of the output end connection expansion valve 11 of air-cooled finned heat exchanger 13, the side of air-cooled finned heat exchanger 13 is setThere is a variable-frequency fan 12, the second refrigerating medium output end of plate heat exchanger 15 connects variable frequency pump 16, and the second of plate heat exchanger 15First output end of refrigerating medium input terminal connection hot-water cylinder 17.
It includes air-cooled finned heat exchanger 1 that room air, which adjusts unit, and the output end of air-cooled finned heat exchanger 1 passes through changeFrequency water pump 2 connects the first input end of cold water tank 3, the first output of the input terminal connection cold water tank 3 of air-cooled finned heat exchanger 1The side at end, air-cooled finned heat exchanger 1 is equipped with variable-frequency fan 22.
Control unit includes controller, temperature signal probe 21, the temperature in cold water tank 3 in room airSignal probe 4 and the temperature signal probe 18 in hot-water cylinder 17, controller are separately connected the 9, second electricity of third solenoid valveMagnet valve 10, the first solenoid valve 14, variable-frequency fan 22, variable-frequency fan 12, variable frequency pump 2, variable frequency pump 5, variable frequency pump 16, frequency conversionCompressor 20.
Control unit controls the unlatching of second solenoid valve 10 in summer, and third solenoid valve 9 and the first solenoid valve 14 are turned off,It controls third solenoid valve 9 when in winter to open, second solenoid valve 10 is closed, and the first solenoid valve 14 is opened.
Fig. 2 is the schematic diagram for describing the short-term fluctuation characteristic of photovoltaic power generation.Since the output power of photovoltaic power generation is by weatherSituation is affected, and in illumination abundance, power is higher, and in illumination deficiency, power is lower, therefore it has intermittent fluctuationCharacteristic.
1. the present invention, which automatically controls air-conditioning unit by control unit, makes Indoor Temperature by taking summer operation mode as an exampleDegree is maintained at 26 DEG C of set temperature, is adjusted using revolving speed of the PID controller negative feedback mode to variable-frequency fan 22, whereinRatio and integral two is used only in PID controller, and parameter is set as KP=4.615, Ki=-0.05722.When temperature signal probe 4When measuring 3 water temperature of hot-water cylinder and dropping to 12 degree, control unit opens variable-frequency fan 22, and in real time according to temperature signal probe 4 atTemperature adjusts the revolving speed of variable-frequency fan 22 revolving speed and variable frequency pump 2, so that the temperature and wind speed of the wind of the blowout of variable-frequency fan 22Resultant effect is in human comfort's range area.Indoor temperature value is conveyed to control unit by temperature signal probe 21, with set temperatureIt is compared.When room temperature be greater than set temperature when, control unit increase 22 revolving speed of variable-frequency fan, and with room temperature withThe reduction of the difference of set temperature, 22 revolving speed of variable-frequency fan are gradually reduced.Wherein the rotational speed regulation of variable-frequency fan 22 passes through defeated to itsThe voltage signal for entering 0~5V realizes that the size of voltage signal reflects the speed of 22 revolving speed of variable-frequency fan.When system reaches stable stateWhen, room temperature maintains 26 DEG C, and the change curve of room temperature is as shown in figure 3, the voltage value for the adjusting revolving speed that variable-frequency fan 22 inputs becomesIt is as shown in Figure 4 to change curve.
2. the present invention changes the revolving speed of frequency-changeable compressor 20 by control unit, photovoltaic power generation short-term fluctuation is stabilized, is realizedDynamic energy storage.Frequency-changeable compressor 20 is powered by photovoltaic power generation, when the power of photovoltaic power generation is greater than the specified function of frequency-changeable compressor 20When rate, 20 revolving speed of frequency-changeable compressor increases, and makes the reduction of 3 temperature of cold water tank, and the overall refrigerating effect of system gets a promotion at this time, and control is singleMember reduces 22 revolving speed of variable-frequency fan, so that room temperature is remained unchanged, is at this time energy storage mode.Become when the power of photovoltaic power generation is less thanWhen the rated power of frequency compressor 20, the input power of frequency-changeable compressor 20 is smaller, and the revolving speed of frequency-changeable compressor 20 reduces, so thatOverall refrigerating effect is reduced, at this time for take can mode.Control unit increases 22 revolving speed of variable-frequency fan, and cooling capacity passes through air in cold water tank 3Unit transportation is adjusted to interior, meets user demand.It is sine curve by the input power curve approximation of frequency-changeable compressor 20, insteadThe short-term fluctuation characteristic of photovoltaic power generation is reflected, as shown in Figure 5.After system reaches stable state, the water temperature of cold water tank 3 changes such as Fig. 6 instituteShow, cyclic fluctuation is carried out about 5 DEG C, reflects its energy storage capacity.
3. the conversion that double evaporators unit of the invention is evaporated device in summer, winter.In summer, outdoor temperature compared withHeight, second solenoid valve 10 are closed, and third solenoid valve 9 disconnects, and vaporizer side can using water as refrigerating medium using plate heat exchanger 6Realize dynamic energy storage.In winter, no refrigeration demand, third solenoid valve 9 are closed, and second solenoid valve 10 disconnects, and vaporizer side usesAir-cooled finned heat exchanger 8, constant-speed fan 7 are opened, and it is at this time air source heat pump operational mode that refrigerant absorbs heat from air.
4. the present invention adjusts 12 turns of variable-frequency fan of heat-recovery condenser unit according to user demand in summer, control unitSpeed makes to set refrigerating efficiency, heating efficiency under operating condition and mentions in the case where overall refrigerating effect, total heating capacity obtain satisfactionIt is high.Carrying out practically mode is adjusted according to the use state of user.
User closes the switch of air-conditioning unit when withdrawing from a room, and control unit closes variable frequency pump 2, frequency conversion wind22, variable-frequency fan 12 are fanned, heat-recovery condenser unit carries out part recuperation of heat, and wherein recuperation of heat amount is opened compared to variable-frequency fan 12It increased in the case where opening.Refrigerant reduces in the degree of supercooling of the output end of air-cooled finned heat exchanger 12, in plate evaporationSpecific refrigerating effect in device 6 is reduced, and 3 temperature drop rate of cold water tank slows down.Due to the heat dissipation capacity of air-cooled finned heat exchanger 12It reduces, the heat recycled is mentioned for promoting water temperature in hot-water cylinder 17, total heating capacity compared to when opening variable-frequency fan 12It is high.Water temperature in hot-water cylinder 17 is transported to control unit by temperature signal probe 18, and when water temperature rises to 50 degree, control unit is closedCompressor 20, variable frequency pump 5, variable frequency pump 16 are closed, system is out of service, is kept the temperature.
When user returns to room, the switch of air-conditioning unit is opened, control unit opens frequency-changeable compressor 20, frequency conversion water5, variable frequency pump 16, variable frequency pump 2, variable-frequency fan 22 are pumped, and the revolving speed of variable-frequency fan 12 is adjusted to maximum, heat-recovery condenserUnit carries out part recuperation of heat.At this point, the heat dissipation capacity of fan-cooled radiator 12 increases to maximum, refrigerant exchanges heat in air-cooled finThe degree of supercooling of the output end of device 12 increases, and the specific refrigerating effect in plate heat exchanger 6 increases, and the temperature of cold water tank 3 reduces speedDegree is speeded, and evaporating temperature reduces, so that the condensation temperature of plate heat exchanger 15 declines, unit heating capacity is reduced, overall refrigerating effect phaseIt increases than total heat recovery mode.Control unit reduces 22 turns of variable-frequency fan according to the temperature signal of temperature signal probe 4Speed keeps constant room temperature, meets user's refrigeration demand.Hot-water cylinder 17 has risen to higher in total heat recovery mode at this timeTemperature, can domestic hot-water supply unit, floor heating hot water unit use, meet user hot water demand.