CN1514193A - Low temperature heat source heat pump system and its capacity regulating method - Google Patents
Low temperature heat source heat pump system and its capacity regulating method Download PDFInfo
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- CN1514193A CN1514193A CNA031415563A CN03141556A CN1514193A CN 1514193 A CN1514193 A CN 1514193A CN A031415563 A CNA031415563 A CN A031415563A CN 03141556 A CN03141556 A CN 03141556A CN 1514193 A CN1514193 A CN 1514193A
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Abstract
The method applies refrigerant mixed by two or above compositions to change circulating media concentration through a separation unit; when load is increased at heat pump operation system separates composition of high boiling point through separation unit to raise concentration of low boiling point media in circulation for enhancing ability of heating at low temperature environment; when load is decreased high boiling point composition of high concentration stored in low pressure liquid storage tank at bottom part of separation unit is absorbed systematically through heating means to decrease heat generating amount of system.
Description
Technical field
The present invention relates to a kind of low-temperature thermal source heat pump system and capacity regulation method thereof, utilize the heat pump of variable refrigerant composition, to enlarge the scope and the efficient of power system capacity, particularly after environment temperature reduces, the expansion of system's heating efficiency.
Background technology
Heat pump is normally two-way, and promptly they can realize heating or cooling, perhaps heating and cooling simultaneously sometimes.At present with power-actuated dwelling house with and small commercial air heat source and thermal pump system move and performance on exist limitation aspect two.Mainly be, they do not have sufficient capacity under low temperature environment, must utilize the supplemental heat source such as resistance heated or oil combustion like this.In addition, heat pump under low temperature environment, work the heating air themperature be lower than the temperature that people feel comfortably cool.Equally, when heat pump was used to freeze purpose, the indoor and outdoor surroundings variation of temperature caused the variation to refrigeration requirement, otherwise influenced indoor comfort degree and the decline that causes systematic function.
Summary of the invention
The purpose of this invention is to provide a kind of low-temperature thermal source heat pump system and capacity regulation method thereof.
A kind of low-temperature thermal source heat pump system is the inlet ports that is connected to four-way change-over valve by exhaust outlet of compressor, the first outlet port of four-way change-over valve is by pipeline junction chamber external heat exchanger successively, check valve, high-pressure storage tank, the low pressure regulator of road connection wherein, check valve, indoor heat exchanger, the 3rd port of four-way change-over valve, the second outlet port tube connector one tunnel of four-way change-over valve directly connects the air entry of compressor, another road connects the import of separator, the outlet of separator connects the air entry of compressor, connect another pipeline of through magnetic valve from high-pressure storage tank outlet, the mechanism of decompressor is in the gas-liquid separator of separator; Heating the circulation time indoor heat exchanger is condenser, and its outlet links to each other with the high-pressure storage tank import by check valve during actual motion, is to link to each other with outdoor heat exchanger as evaporimeter by low pressure regulator, check valve in the outlet of high-pressure storage tank.
It is the separator that outdoor heat exchanger is communicated with described compressor, evaporimeter that the capacity regulation method of a kind of low-temperature thermal source heat pump system provides one, when moving in the winter time: system was for improving the operative liquid refrigerant mixture that evaporating pressure is discharged when described low pressure receiver was used to hold low temperature environment, by heating and add cold-producing medium in the described low pressure receiver of two kinds of means rectifying of phegma, thereby make in the mixture of institute's splendid attire and be mainly higher boiling working medium component, to increase system's low boiling point refrigerant circulation composition, increase the heating efficiency of heat pump; When environment temperature raise, described low pressure receiver to reduce power system capacity, improved system effectiveness to the higher boiling cold-producing medium that described system provides the high concentration of being held.
The capacity regulation method of another kind of low-temperature thermal source heat pump system provide one with described compressor, evaporimeter is the separator that outdoor heat exchanger is communicated with, when summer operation: when required cooling load increases, the execution valve event of low pressure regulator, increase the refrigerant flow that flows through evaporimeter, when the evaporator outlet refrigerant temperature still can not drop to range of set temperature within a certain period of time, the bypass line that then reduces pressure is opened, make excessive liquid enter separator, liquid working substance falls through undue gas-liquid separator the time, the low pressure receiver is heated simultaneously, distillation process takes place, in higher boiling working medium amount increase, the low boiling point component ratio of cycle fluid raises in the system, and system's refrigerating capacity increases; When required refrigeration duty reduced, compressor air suction pressure was on the low side after setting value, and the higher boiling working medium in the low pressure receiver is heated and enters systemic circulation, and higher boiling working medium ratio increases in the system, and system's refrigerating capacity reduces.
The present invention can move in very wide environment temperature effectively, when moving in the winter time, this scope satisfies the requirement of building heating load, by providing enough high temperature to add hot-air to the space effectively, heat pump can provide comfortable room air to transmit temperature, can not produce the cold airflow effect again, and heat pump uses the cold-producing medium of the safety of accepting as environment.And in summer during cooling condition, system's output cold becomes with the need, and air-conditioning is effective, and system's start and stop are few, the usefulness height.
The present invention uses zeotrope to realize above advantage as cycle fluid, and it is based on following reason:
At first, R22 working medium commonly used at present belongs to HCFC working medium, existing in the world limited production, superseded plan at it, and progressively implementing.And in the working substance substitute of R22, the better pure matter of rare performance mostly is mixed working fluid greatly.
Secondly, overcome the limitation of pure matter in the heat pump utilization.When outdoor temperature reduced, conventional pure matter working medium was because the limitation of self thermodynamic properties can not be drawn the demand that more heat satisfies the room heat from environment.Need to use the auxiliary thermal source heating service.And adopt mixed working-medium to change concentration to regulate, and can improve the thermodynamic properties of working medium by changing the component of low boiling working fluid in the mixture, make it can from environment, draw more heat.
Mixed working fluid has the advantage that can mate working medium concentration stabilize performance, and degree of the thickening capacity regulating of mixed working fluid can be improved seasonal energy efficiency ratio (seer).Adopt degree of thickening capacity regulating in the sub-load district, the mated stable state Energy Efficiency Ratio of the mixed working fluid through rationally selecting all will be higher than pure matter cold-producing medium R22.Experiment showed, that the seasonal energy efficiency ratio (seer) that obtains is greater than the seasonal energy efficiency ratio (seer) of start-stop regulating system if air-conditioning system working medium concentration in operation season changes according to mating the working medium concentration curve.
The degree of thickening of mixed working fluid is regulated the fluctuation that can eliminate the start-stop loss and reduce room temperature.Desirable degree of thickening capacity regulating can be by following that adjusting is exerted oneself and loaded, and is constant or regulate much smaller indoor temperature change generated in case than start-stop to satisfy indoor temperature.Can the be not periodic start-stop of this kind air-conditioning system because of the frequent movement of temperature controller, thus the start-stop loss of refrigeration capacity eliminated.
Description of drawings
Accompanying drawing is a kind of low-temperature thermal source heat pump system architecture schematic diagram.
The specific embodiment
Because system of the present invention adopts the varying capacity mode, need the cold-producing medium of use more than conventional system, need store unnecessary volume during operation.In order to achieve this end, native system uses high-pressure storage tank 5 and low pressure receiver 16, in low pressure receiver 16, deposit with respect to systemic circulation concentration and excessive mainly be high boiling refrigerant mixture, in high-pressure storage tank 5, hold the unnecessary cold-producing medium that is same as system's concentration.
According to the present invention, heat pump uses a certain amount of two (many) components mixed non-azeotropic refrigerant that is enough to realize power system capacity, and the boiling point of a kind of (or multiple) component in the cold-producing medium is higher than other components in the mixture; One by a rectifying column 15 to low pressure receiver 16 feed and the separator 13 of from system's mixture, removing high boiling component.Further according to this mode of the present invention, the liquid in the receiver 16 can be heated the concentration range that makes the high boiling component that is separated in the mixture be in a very high percentage.
This mode of the present invention can use a lot of HFC mixtures or other cold-producing mediums of accepting as environment to carry out work.Though concrete cold-producing medium composition and the present invention are irrelevant, as an example, the cold-producing medium that the present invention adopts is that R32/R134a contains R32 and R134a.The multiple combination of they and other HFC working medium also can be worked effectively, and this depends on wishes the heating and cooling excursion that obtains to require wherein two kinds of its normal boiling points of working medium in the mixture to differ certain value simultaneously.
Accompanying drawing is illustrated in valves all in the system, connection line and assembly.Low pressure regulator wherein adopts electric expansion valve.
The conventional part of heat pump of the present invention comprises indoor heat exchanger 4, outdoor heat exchanger 3, compressor 1, four-way change-over valve 2, low pressure regulator 6 and relevant valve accessories.Increasing part in addition is to establish in order to realize the varying capacity purpose, the check valves of separator 13, the decompression bypass line 20 that is parallel to low pressure regulator 6 and evaporimeter (being indoor heat exchanger 4 during refrigeration, is outdoor heat exchanger 3 when heating), low pressure modulating valve door opening/shutting controller and several the control flow directions that comprise the high-pressure storage tank 5 that holds the highly pressurised liquid that condenser flows out, form by gas-liquid separator 14, rectifying column 15, low pressure receiver 16 etc.
It is from compressor 1 → four-way change-over valve 2 → indoor heat exchanger 4 (as condenser) → check valves 8 → high-pressure storage tank 5 → low pressure regulator 6 → check valve 9 → outdoor heat exchanger 3 (as evaporimeter) → four-way change-over valves 2 → separator 13 → compressor 1 that heat pump fluid flows to.When heat pump is in refrigerating mode, flow to from compressor 1 → four-way change-over valve 2 → outdoor heat exchanger 3 (as condenser) → check valves 7 → high-pressure storage tank 5 → low pressure regulator 6 → check valve 10 → indoor heat exchanger 4 (as evaporimeter) → four-way change-over valves 2 → separator 13 → compressor 1.Compressor can be any common piston type, rotary or other types compressor.
According to the present invention, an electric heater 17 is arranged in the low pressure receiver 16.For energy-conservation, also can adopt electric heater and heat(ing) coil composite construction to realize heating purposes.At this moment heat(ing) coil is connected to the opposite side of high-pressure storage tank outlet magnetic valve by conduit with it, and the break-make by the control magnetic valve can make selectively that working medium flows through low pressure receiver 16, it is heated.When opening magnetic valve, heat(ing) coil is not in system.The alternative condition of compound mode of heating is: when outdoor environment temperature higher, as selecting a certain temperature by calculating, be higher than under this temperature, adopt Electric heating to provide heat to make low boiling component concentration wherein be lower than certain limit to low pressure receiver 16, and when being lower than this environment temperature, then because high-pressure storage tank refrigerant liquid temperature is much higher than rectification temperature, event can this fluid working substance flows through the low pressure receiver so that it keeps uniform temperature by controlling, and extra electric energy need be provided, more economical; Because add liquid in the heat low receiver, the cold-producing medium that returns can be abundant cold excessively before entering low-voltage device, thereby raise the efficiency simultaneously.But consider and adopt the compound mode of heating system that can make to be not easy to stablize, and move and control the complexity that becomes, so this patent is only introduced independent electrical heating pattern.By a common rectifying column 15 to its underpart low pressure receiver 16 feed, rectifying column is worked together in conjunction with a common liquid/vapor gas-liquid separator 14, their working method is such, when the systematic steady state operate as normal, the overheated gas that is all certain overheat range (as 5 ℃) from evaporimeter 3 outflows, directly flow back into compressor 1, the low pressure receiver 16 in the separator 13, rectifying column 15 are all outside system.When outdoor temperature reduces, working medium under the ultimate constituent ratio is difficult to absorb enough heats in evaporimeter 3 and can not be all evaporated, the degree of superheat reduces gradually up to the two-phase state during from 3 outflows, even throttling arrangement is regulated voluntarily, make refrigerant flow reduce, but can cause the pressure of inspiration(Pi) of compressor to be lower than controlling value (as being set at 0.5Mpa), at this moment the magnetic valve 11 on parallel with the low pressure regulator 6 decompression bypass line 20 that leads to separator 13 is opened, making has the mixture working medium of low discharge to flow to 13 interior gas-liquid separators, by the ejection of terminal aperture, it is the two-phase state, liquid phase working fluid partly can stay along rectifying column 15, this electrical heating of separator bottom is simultaneously also opened, institute adds that temperature is in height in the heat requirement jar, low boiling working fluid is between each self-corresponding saturation temperature t height and t under the jar internal pressure are low, and then the fractional distillation process time can lack to approach the t height.Provide certain adding under the heat at electric heater like this, cause blending ingredients evaporation, the more solution rising of can vaporizing, its degree is with volatility is relevant separately.R134a normal boiling point-26.16 ℃, R32 is-52.8 ℃, so this mixture is non-azeotropic.Carry out caloic exchange in rectifying column, being in contact with one another of the mixture liquid by the gas mixture that rises and decline makes more low boiling working fluid R32 be got back in the system by the compressor suction, and higher boiling working medium R134a is left in the low pressure receiver.After staying low pressure receiver 16, compressor 1 pressure of inspiration(Pi) goes back up to the controlling value scope when a certain amount of high boiling component in the system is separated like this, and power system capacity is increased.
When outside air drops to when being lower than 5 ℃, will there be more liquid to flow in the low pressure receiver.At this moment can be bigger by the electrical heating amount, to adapt to stronger demand for heat.By rectifying, systemic circulation working medium composition is than reaching a new balance, and wherein the percentage of R134a can descend a lot, and this depends on the parameter of whole system.Like this, just can obtain component easily less than a certain R134a percentage.Certainly, consider whether the security (comprising the flammable restriction of mixture) and the compressor of system is special high pressure resistant pattern, generally can be by controlling the minimum percent that the high pressure maximum is come higher boiling composition in the control system cycle fluid.If system is through particular design, system can move under very low higher boiling working medium percentage.
One regulation is arranged during the control of magnetic valve 11 break-makes of decompression on the bypass line 20, promptly be that it has opened the regular hour restriction at every turn, 11 do not close even compressor air suction pressure still is returned to setting, at this moment the electric heater 17 in the low pressure receiver 16 is still in work, and distillation process is still carrying out.Also do not reach requirement as degree of thickening purpose behind the certain hour, then 11 connect certain hour once more, phegma is provided.So repeatedly, up to the system's concentration that realizes requiring.Decompressor 12 can be electric expansion valve, capillary, restriction sleeve, constant pressure valve, and the flow during bypass is the 1/3-1/5 of main expansion valve flow.
Making the low boiling component of low pressure receiver 16 be lower than the finite concentration scope needs certain hour, and this depends primarily on the quantity of the low boiling working fluid that adds heat, flowed into, and reaches the liquid that stops to heat after the requirement in 16, makes its no longer evaporation as far as possible.Mixture in the system contains R134a still less now, because most R134a is stored in the low pressure receiver.
Again according to the present invention, when outdoor temperature raise and add heat request descend, when system need reduce capacity, the frigorific mixture of working in the system should return to the R134a that comprises higher concentration.This can be by providing bigger heat to realize to low pressure receiver 16.When the compressor air suction mouth pressure is higher than the controlling value certain limit, drive heater, notice that at this moment the decompression bypass line 20 at magnetic valve 11 places is not worked.Because that store in 16 is the higher boiling working medium R134a of high concentration, heating makes the higher boiling component ratio that sucks compressor 1 air entry increase, thereby reduce the circulation composition of low boiling working fluid in system's mixture, pressure of inspiration(Pi) can drop to control range, reaches to subtract the appearance purpose.
Below basically narration be winter and transition season heat pump the operation working condition, the control of circulating mixture concentration and winter is opposite substantially under the summer cooling condition.During normal the operation, as long as temperature deviation in allowed limits, the original content operation is pressed by system, and compressor air suction pressure keeps the certain numerical value scope.When outdoor temperature raise, outdoor heat exchanger 3 cooling medium inlet temperature raise, and indoor refrigeration duty also can increase.Evaporimeter 4 side draught heats increase, and the evaporator outlet working medium degree of superheat increases, and low pressure regulator 6 apertures increase, and internal circulating load is increased, and system's refrigerating capacity increases.If indoor environment temperature is still higher promptly higher when with setting certain deviation being arranged at indoor heat exchanger 4 outlet refrigerant temperatures under the same systemic circulation concentration, bypass solenoid valve 11 is opened, therefore have some liquid working substances and fall when the gas-liquid separator 14 of process separator 13, R32 concentration raises in the low pressure receiver 16.When the decompression bypass line is opened, heater is opened provides heat, distillation processes take place in the rectifying column 15 makes the R32 in 16 come back in the system, and higher boiling working medium R134a can increase, the higher boiling composition R32 ratio of cycle fluid raises in the system, must cause system's refrigerating capacity to increase, satisfy the air-conditioning needs.When outdoor temperature reduces, indoor refrigeration duty reduces, outdoor heat exchanger 3 cooling medium inlet temperature also can reduce, working medium took place cold in 3, evaporimeter 4 pressure descend, and cause compressor 1 pressure of inspiration(Pi) to descend, when it drops to when departing from control minimum pressure value certain value, system feedback strengthens the electrical heating amount in the low pressure receiver, and decompression bypass line 20 is obstructed.Then mainly be that higher boiling working medium enters circulation in the low pressure receiver 16, higher boiling working medium proportion increases in the systemic circulation, and system's refrigerating capacity reduces, and evaporator pressure returns to the ideal range of control.
Before mention that no matter summer, refrigerating operaton still was winter heating's operation, systemic circulation working medium percentage has certain excursion in case the locking system condensing pressure is too high, guarantees safe operation.Control mode is when system high pressure reaches the lower bound of a certain scope, stops the heating of low pressure receiver 16, stops separation process.If high pressure continues to raise, then can strengthen electrical heating amount in 16, increase higher boiling working medium composition in the systemic circulation working medium.Usually, by above measure, system high pressure can fall after rise.Just in case system high pressure continues to be elevated to the high limit of control range, then the action of high voltage protective device, system-down.
The action of each magnetic valve, heater is by automaton 21 commander, and according to the signal and the setting value of pressure sensor and temperature sensor, the low pressure regulator of control is carried out the heat that adds of the aperture of valve and low pressure receiver internal heater.
The operation of heat pump exists the oil return problem.For native system, have only in the low pressure receiver 16 after accumulating lubricating oil, can not cooled dose take back automatically in the compressor, therefore need regularly oil return.And when compressor exhaust temperature is higher than a certain design temperature, also need to increase the oil return operating frequency.During oil return, magnetic valve 18 is opened, and vacuum solenoid valve 19 is closed, the lubricating oil that leans on compressor 1 air intake duct draws low pressure receiver 16 to be accumulated.Air exit on the gas-liquid separator 14 is made structural shape shown in Figure 1: two identical little blast pipes of ratio piston compressor air suction main caliber, on wherein one magnetic valve 19 is housed, to control its break-make, keep normally open at ordinary times, when the needs oil return, this magnetic valve energising is closed, and 18 energisings of oil return pipe magnetic valve are opened, compressor normal suction pipe resistance increases, and the pressure of low pressure receiver will be than pressure of inspiration(Pi) height, thus the lubricating oil that foot accumulates in the Suction cop.
During compressor start, for preventing the liquid hammer situation of compressor, can be designed so that 19 short time of magnetic valve close, reduce inspiratory capacity, simultaneously because the low pressure throttling arrangement is an electric expansion valve, can make it when system is out of service to close, and also can be designed to initial start stage it is slowly opened.
When stable state heats, may on evaporimeter, produce frost.In this case, can reverse four-way change-over valve 2, realize the Defrost operation of about a few minutes termly.System promptly by summer refrigeration modes carry out traditional Defrost operation.
Claims (7)
1. low-temperature thermal source heat pump system, it is characterized in that: compressor (1) exhaust outlet is connected to the inlet ports of four-way change-over valve (2), an outlet port (2a) of four-way change-over valve (2) is by pipeline junction chamber external heat exchanger (3) successively, check valve (7), high-pressure storage tank (5), the low pressure regulator (6) of road connection wherein, check valve (10), indoor heat exchanger (4), the port (2c) of four-way change-over valve (2), the port (2b) of four-way change-over valve (2), outlet port (2b) tube connector one tunnel directly connects the air entry of compressor (1), another road connects the import of separator (13), the outlet of separator (13) connects the air entry of compressor, connect another pipeline (20) of through magnetic valve (11) from high-pressure storage tank (5) outlet, the mechanism of decompressor (12) is in the gas-liquid separator (14) of separator (13); Heating circulation time indoor heat exchanger (4) is condenser, its outlet links to each other with high-pressure storage tank (5) import by check valve (8) during actual motion, is to link to each other with outdoor heat exchanger (3) as evaporimeter by hanging down pressure regulator (6), check valve 9 in the outlet of high-pressure storage tank (5).
2. a kind of low-temperature thermal source heat pump according to claim 1 system, it is characterized in that: the decompressor (12) in the said decompression bypass line (20) is electric expansion valve, capillary, restriction sleeve, constant pressure valve.
3. a kind of low-temperature thermal source heat pump according to claim 1 system, it is characterized in that: said low pressure receiver (16) is the container that electric heater is equipped with in an inside.
4. the capacity regulation method of a low-temperature thermal source heat pump system, it is characterized in that, provide one with described compressor (1), evaporimeter is the separator (13) that outdoor heat exchanger (3) is communicated with, when moving in the winter time: described low pressure receiver (16) the operative liquid refrigerant mixture that system discharges for the raising evaporating pressure when being used to hold low temperature environment, by heating and add cold-producing medium in the phegma described low pressure receivers of two kinds of means rectifying (16), thereby make in the mixture of institute's splendid attire and be mainly higher boiling working medium component, to increase system's low boiling point refrigerant circulation composition, increase the heating efficiency of heat pump; When environment temperature raise, described low pressure receiver (16) to reduce power system capacity, improved system effectiveness to the higher boiling cold-producing medium that described system provides the high concentration of being held.
5. the capacity regulation method of a kind of low-temperature thermal source heat pump according to claim 4 system is characterized in that the aperture control heating capacity of said low pressure regulator.
6. the capacity regulation method of a low-temperature thermal source heat pump system, it is characterized in that, provide one with described compressor (1), evaporimeter is the separator (13) that outdoor heat exchanger (3) is communicated with, when summer operation: when required cooling load increases, the execution valve event of low pressure regulator (6), increase the refrigerant flow that flows through evaporimeter (4), when the evaporator outlet refrigerant temperature still can not drop to range of set temperature within a certain period of time, the bypass line (20) that then reduces pressure is opened, make excessive liquid enter separator (13), liquid working substance falls through undue gas-liquid separator (14) time, low pressure receiver (16) is heated simultaneously, and distillation process takes place, and the higher boiling working medium amount in (16) increases, the low boiling point component ratio of cycle fluid raises in the system, and system's refrigerating capacity increases; When required refrigeration duty reduced, compressor (1) pressure of inspiration(Pi) was on the low side after setting value, and the higher boiling working medium in the low pressure receiver (16) is heated and enters systemic circulation, and higher boiling working medium ratio increases in the system, and system's refrigerating capacity reduces.
7. the capacity regulation method of a kind of low-temperature thermal source heat pump according to claim 6 system is characterized in that the aperture control refrigerating capacity of said low pressure regulator.
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| CN 03141556 CN1247945C (en) | 2003-07-08 | 2003-07-08 | Low temperature heat source heat pump system and its capacity regulating method |
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| CN 03141556 CN1247945C (en) | 2003-07-08 | 2003-07-08 | Low temperature heat source heat pump system and its capacity regulating method |
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| CN 200510067537 Division CN1690596A (en) | 2003-07-08 | 2003-07-08 | Low-temperature thermal source heat pump capacity regulation method |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100376850C (en) * | 2006-03-27 | 2008-03-26 | 浙江大学 | Hot pump system with variable capacity |
| CN101813373A (en) * | 2010-04-27 | 2010-08-25 | 冯益安 | Low-pressure extraction-type heat pump water heater or water boiler |
| CN101813403A (en) * | 2010-04-21 | 2010-08-25 | 冯益安 | Low-pressure extraction-type air conditioner or heat pump water heater |
| CN102147162A (en) * | 2011-03-16 | 2011-08-10 | 浙江大学 | Rectifying type variation-concentration self-overlaying gas liquefaction system |
| CN101769659B (en) * | 2009-01-05 | 2011-08-31 | 珠海格力电器股份有限公司 | Heat pump type air conditioner system |
| CN105276864A (en) * | 2014-07-10 | 2016-01-27 | 南京理工大学 | Variable-component refrigerant heat pump hot water unit |
| CN107036230A (en) * | 2016-02-04 | 2017-08-11 | Lg电子株式会社 | The method of air-conditioning and control air-conditioning |
| CN108364701A (en) * | 2018-05-02 | 2018-08-03 | 哈尔滨理工大学 | A kind of self-circulation system of the cold driving motor of high pressure helium |
| CN109881669A (en) * | 2019-03-11 | 2019-06-14 | 浙江大学城市学院 | A kind of plastic bushing energy pilework and construction method |
| CN110036248A (en) * | 2016-12-07 | 2019-07-19 | 三菱重工制冷空调系统株式会社 | Heat source system, control device, control method and program |
| CN110220326B (en) * | 2019-02-26 | 2024-01-23 | 北京华电东晟科技有限公司 | Automatic variable-load air source heat pump for preparing high-temperature hot water from ultralow-temperature air |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100376850C (en) * | 2006-03-27 | 2008-03-26 | 浙江大学 | Hot pump system with variable capacity |
| CN101769659B (en) * | 2009-01-05 | 2011-08-31 | 珠海格力电器股份有限公司 | Heat pump type air conditioner system |
| CN101813403A (en) * | 2010-04-21 | 2010-08-25 | 冯益安 | Low-pressure extraction-type air conditioner or heat pump water heater |
| CN101813373A (en) * | 2010-04-27 | 2010-08-25 | 冯益安 | Low-pressure extraction-type heat pump water heater or water boiler |
| CN102147162A (en) * | 2011-03-16 | 2011-08-10 | 浙江大学 | Rectifying type variation-concentration self-overlaying gas liquefaction system |
| CN102147162B (en) * | 2011-03-16 | 2012-06-27 | 浙江大学 | Rectifying type variation-concentration self-overlaying gas liquefaction system |
| CN105276864A (en) * | 2014-07-10 | 2016-01-27 | 南京理工大学 | Variable-component refrigerant heat pump hot water unit |
| CN105276864B (en) * | 2014-07-10 | 2018-01-05 | 南京理工大学 | One kind becomes component refrigerants heat-pump hot-water unit |
| CN107036230A (en) * | 2016-02-04 | 2017-08-11 | Lg电子株式会社 | The method of air-conditioning and control air-conditioning |
| CN110036248A (en) * | 2016-12-07 | 2019-07-19 | 三菱重工制冷空调系统株式会社 | Heat source system, control device, control method and program |
| CN108364701A (en) * | 2018-05-02 | 2018-08-03 | 哈尔滨理工大学 | A kind of self-circulation system of the cold driving motor of high pressure helium |
| CN108364701B (en) * | 2018-05-02 | 2024-02-06 | 哈尔滨理工大学 | Self-circulation system of high-voltage helium cold driving motor |
| CN110220326B (en) * | 2019-02-26 | 2024-01-23 | 北京华电东晟科技有限公司 | Automatic variable-load air source heat pump for preparing high-temperature hot water from ultralow-temperature air |
| CN109881669A (en) * | 2019-03-11 | 2019-06-14 | 浙江大学城市学院 | A kind of plastic bushing energy pilework and construction method |
| CN109881669B (en) * | 2019-03-11 | 2023-09-19 | 浙江大学城市学院 | Plastic sleeve energy pile structure and construction method |
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