CN103292465A - Trans-critical carbon dioxide heat pump water heater - Google Patents
Trans-critical carbon dioxide heat pump water heater Download PDFInfo
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- CN103292465A CN103292465A CN2013102180042A CN201310218004A CN103292465A CN 103292465 A CN103292465 A CN 103292465A CN 2013102180042 A CN2013102180042 A CN 2013102180042A CN 201310218004 A CN201310218004 A CN 201310218004A CN 103292465 A CN103292465 A CN 103292465A
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- carbon dioxide
- air cooler
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- expansion valve
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Abstract
The invention discloses a trans-critical carbon dioxide heat pump water heater which comprises a control system, a compressor, an air cooler, a filter, an electronic expansion valve, an evaporator with a fan, and a water pump. A temperature sensor is arranged at an air vent of the air cooler, and a pressure sensor is arranged at an air outlet of the compressor. The temperature sensor and the pressure sensor can timely transmit measured temperature tgc, o,p to the control system; the control system can judge whether the tgc, o,p satisfy a formula: p=131.3-8.39tgc, o+0.31t2gc,o-27.6x10-4t3gc, o or not according to received tgc, o,p, if yes, operating is continued, and if not, the control system controls and adjusts at least one of the electronic expansion valve, the fan of the evaporator and the water pump to enable carbon dioxide pressure p at the air vent of the compressor to satisfy the formula. When in use, the trans-critical carbon dioxide heat pump water heater can always have high performance coefficients.
Description
Technical field
The present invention relates to a kind of CO 2 trans-critical heat pump water heater.
Background technology
In the prior art, carbon dioxide heat-pump is owing to adopt carbon dioxide as refrigerant, it is nontoxic, nonflammable, little and cheap to the side effect of environment, yet, adopt the common efficient of carbon dioxide lower, the technological difficulties that are applied to art of heat pumps are many, and efficiency far is not as good as the equipment of common refrigerant.The critical piece of carbon dioxide heat-pump water heater has: compressor, air cooler, filter, electric expansion valve, the evaporimeter that has blower fan, fluid reservoir.Carbon dioxide working medium enters compressor, the carbon dioxide that is compressed into HTHP enters air cooler, and be cooled, the heat of its release is heated the cold water by this cooler, through after the air cooler, carbon dioxide enters filter then again through electric expansion valve throttling cooling and partial gasification, and moist steam becomes gas-liquid mixture after entering evaporimeter, then enters to enter compressor again behind the fluid reservoir and finish a circulation.In this circulation, the pressure carbon dioxide at exhaust outlet of compressor place has an optimum discharge pressure, this optimum discharge pressure makes the heating energy efficiency ratio COP of whole carbon dioxide heat-pump water heater reach best, in the prior art as can be known, air cooler exhaust ports carbon dioxide temperature t
Gc, oPressure carbon dioxide to the exhaust outlet of compressor place has significant impact, how to make that the pressure carbon dioxide at exhaust outlet of compressor place is that optimum discharge pressure is the difficult problem of carbon dioxide heat-pump industry always.
Summary of the invention
The purpose of this invention is to provide a kind of CO 2 trans-critical heat pump water heater with higher heating energy efficiency ratio COP.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: a kind of CO 2 trans-critical heat pump water heater, comprise the carbon dioxide heat-pump system, hot water supply system and control system, described carbon dioxide heat-pump system comprises the compressor that sets gradually, air cooler, filter, electric expansion valve, the evaporimeter that has blower fan, fluid reservoir, described air cooler inside has gas path and water passage, described hot water supply system comprises supply channel, described supply channel has cold water inlet, water pump, hot water outlet, described cold water inlet and hot water outlet are connected with the two ends of the water passage of described air cooler respectively, the air inlet of the gas path of described air cooler is connected with the exhaust outlet of described compressor reducer, the exhaust outlet of gas path is connected with the entrance of electric expansion valve, described filter bits is between the gas path exhaust outlet and electronic expansion valve inlet of described air cooler, water in the described supply channel carries out heat exchange with the carbon dioxide that enters in the gas path of air cooler in described air cooler, described electric expansion valve, the blower fan of evaporimeter, the even described control system phase control connection of water pump, the exhaust ports of described air cooler is provided with for detection of air cooler exhaust ports carbon dioxide temperature t
Gc, oTemperature sensor, the exhaust ports of described compressor is provided with the pressure sensor for detection of this exhaust ports pressure carbon dioxide p, described temperature sensor, pressure sensor connect with signal with described control system respectively, and described temperature sensor and pressure sensor can be with the temperature t that records
Gc, o, p in time is transferred to described control system, described control system can be according to the described t that receives
Gc, o, the p value judges whether it meets p=131.3-8.39t
Gc, o+ 0.31t
2 Gc, o-27.6 * 10
-4t
3 Gc, oIf, meet, then continue operation; If do not meet, the running parameter that described control system will control to adjust at least one parts in the blower fan, water pump of described electric expansion valve, evaporimeter makes the pressure carbon dioxide p of described exhaust outlet of compressor place meet above-mentioned relation.
In the technique scheme, preferably, described compressor is semiclosed reciprocating compressor.
In the technique scheme, preferably, the import department of described compressor is provided with low pressure controller, the exit is provided with dual pressure controller.
In the technique scheme, preferably, be set side by side with stop valve mutually with described electric expansion valve.
Beneficial effect of the present invention is: the pressure carbon dioxide of regulating the exhaust outlet of compressor place by the air cooler exhaust ports carbon dioxide temperature that records according to temperature sensor in real time, make it reach optimum discharge pressure, thereby make the carbon dioxide heat-pump water heater in the course of the work, can have higher heating energy efficiency ratio always.
Description of drawings
Accompanying drawing 1 is the schematic diagram of supercritical carbon dioxide Teat pump boiler of the present invention;
Accompanying drawing 2 is the running figure of supercritical carbon dioxide Teat pump boiler of the present invention;
Accompanying drawing 3 is the control chart of compressor outlet of the present invention;
Accompanying drawing 4 is the empirical value of COP of CO 2 trans-critical heat pump water heater of the present invention and the comparison diagram of theoretical value;
In the accompanying drawing: 1, carbon dioxide heat-pump system; 11, compressor; 12, air cooler; 13, filter; 14, electric expansion valve; 15, blower fan; 16, evaporimeter; 17, fluid reservoir; 18, low pressure controller; 19, dual pressure controller; 110, stop valve; 111, magnetic valve; 2, hot water supply system; 21, supply channel; 22, cold water inlet; 23, water pump; 24, hot water outlet; 112, carbon dioxide bypass.
The specific embodiment
Make following detailed description below in conjunction with the present invention of embodiment shown in the drawings:
Supercritical carbon dioxide Teat pump boiler as shown in Figure 1, it adopts carbon dioxide is working medium, it is mainly by carbon dioxide heat-pump system 1, hot water supply system 2 and control system (not shown).Carbon dioxide heat-pump system 1 comprises compressor 11, air cooler 12, filter 13, electric expansion valve 14, the evaporimeter 16 that has blower fan 15, the fluid reservoir 17 that sets gradually.Hot water supply system 2 comprises supply channel 21, and supply channel 21 has cold water inlet 22, water pump 23, hot water outlet 24.Air cooler 12 inside have the water passage for the gas path of carbon dioxide circulation and the circulation of supplying water, and cold water inlet 22 and hot water outlet 24 are connected with the port of export with the arrival end of the water passage of air cooler 12 respectively.The air inlet of the gas path of the air cooler 12 of the outlet of compressor 11 is connected, the exhaust outlet of the gas path of air cooler 12 communicates with the arrival end of electric expansion valve 14, and filter 13 is arranged between the arrival end of the exhaust outlet of gas path of air cooler 12 and electric expansion valve 14.The carbon dioxide that water in the supply channel 21 flows in the water passage flow process of air cooler 12 and in the gas path carries out heat exchange.Electric expansion valve 14 places are set side by side with stop valve 110 mutually, and stop valve 110 can be regulated the carbon dioxide flow that flows into electric expansion valve 14 inside.The port of export of electric expansion valve 14 links to each other with the arrival end of evaporimeter 16, and the port of export of evaporimeter 16 is connected to the arrival end of fluid reservoir 17, and the port of export of fluid reservoir 17 is connected to the porch of compressor 11.In addition, also be provided with a carbon dioxide bypass 112 that is communicated on electric expansion valve and the evaporimeter communication path from the exit of compressor reducer 11, in order to regulate the carbon dioxide flow in the carbon dioxide bypass 113, in this bypass, also be provided with a magnetic valve 111.
The blower fan 15 of electric expansion valve 14, evaporimeter 16, water pump 23 all with control system phase control connection.Wherein, compressor 11 is semiclosed reciprocating compressor.The import department of compressor 11 is provided with low pressure controller 18, the exit is provided with dual pressure controller 19.
In order to monitor the carbon dioxide exhaust outlet temperature of air cooler, be provided with the user in the exit of the gas path of air cooler 12 and detect air cooler exhaust ports carbon dioxide temperature t
Gc, oThe temperature sensor (not shown), in addition, be provided with pressure sensor for detection of the pressure carbon dioxide p of exhaust outlet of compressor place in the exhaust ports of compressor 11, temperature sensor, pressure sensor connect with signal with control system respectively, and temperature sensor and pressure sensor can be with the temperature t that records
Gc, o, p in time is transferred to described control system.
The workflow of this Teat pump boiler is as follows: the carbon dioxide in the fluid reservoir 17 enters compressor 11, become the carbon dioxide of HTHP after the compression through compressor 11, the carbon dioxide of HTHP enters the gas path of air cooler 12 subsequently, the water that flows through with water passage in the air cooler 12 carries out heat exchange, water absorbs heat and is heated then by hot water outlet 24 outflows, the carbon dioxide of HTHP is cooled and gets rid of from exhaust outlet, then electric expansion valve 14 throttlings are lowered the temperature and partial gasification becomes moist steam through entering after filter 13 filtrations, moist steam enters evaporimeter 16 and becomes gas-liquid mixture with the air heat exchange, changes the carbon dioxide that is low-temp low-pressure again and enter compressor 11 after fluid reservoir 17 reclaims.The speed of the blower fan 15 of flow that wherein, can be by regulating water pump 23, the aperture of electric expansion valve 14, evaporimeter 16 is regulated the gas outlet pressure of compressor 11.
The control chart of compressor outlet as shown in Figure 2:
The first step, water heater unlatching work;
Second step, control system receive the temperature t that temperature sensor is issued control system
Gc, o,This moment, control system was according to formula p=131.3-8.39t
Gc, o+ 0.31t
2 Gc, o-27.6 * 10
-4t
3 Gc, oCalculate the optimum pressure at the place, gas outlet of compressor, whether the current exhaust outlet of compressor place pressure carbon dioxide of the pressure sensor real-time Transmission that receives with control system is consistent again, if it is consistent, then each parameters of operating part can make the heating energy efficiency ratio COP of Teat pump boiler reach best in explanation Teat pump boiler this moment, if inconsistent, then at least one parts of regulating in the blower fan of electric expansion valve, evaporimeter, the water pump in the water supply system according to the method shown in the accompanying drawing 3 make the pressure carbon dioxide p of exhaust outlet of compressor place meet above-mentioned relation.As shown in Figure 3, when regulating pressure carbon dioxide P, the aperture of preferentially regulating electric expansion valve is followed fan speed by evaporimeter, is the adjusting of pump capacity at last.
As shown in Figure 4, this works under the varying environment temperature for this carbon dioxide heat-pump water heater, the deviation between the COP value that it is actual and the theoretical best COP value.Scheme as can be known thus, the best COP value of the COP value in its course of work of carbon dioxide heat-pump water heater of the present invention and expectation in theory is zero deflection almost, and the COP of carbon dioxide heat-pump water heater is lower than the best COP value of estimating in theory in the prior art.
Above-described embodiment only is explanation technical conceive of the present invention and characteristics, and its purpose is to allow the personage who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All equivalences that spirit is done according to the present invention change or modify, and all should be encompassed within protection scope of the present invention.Within the bright protection domain.
Claims (4)
1. CO 2 trans-critical heat pump water heater, comprise the carbon dioxide heat-pump system, hot water supply system and control system, described carbon dioxide heat-pump system comprises the compressor that sets gradually, air cooler, filter, electric expansion valve, the evaporimeter that has blower fan, fluid reservoir, described air cooler inside has gas path and water passage, described hot water supply system comprises supply channel, described supply channel has cold water inlet, water pump, hot water outlet, described cold water inlet and hot water outlet are connected with the two ends of the water passage of described air cooler respectively, the air inlet of the gas path of described air cooler is connected with the exhaust outlet of described compressor reducer, the exhaust outlet of gas path is connected with the entrance of electric expansion valve, described filter bits is between the gas path exhaust outlet and electronic expansion valve inlet of described air cooler, water in the described supply channel carries out heat exchange with the carbon dioxide that enters in the gas path of air cooler in described air cooler, described electric expansion valve, the blower fan of evaporimeter, the even described control system phase control connection of water pump, it is characterized in that: the exhaust ports of described air cooler is provided with for detection of air cooler exhaust ports carbon dioxide temperature t
Gc, oTemperature sensor, the exhaust ports of described compressor is provided with the pressure sensor for detection of this exhaust ports pressure carbon dioxide p, described temperature sensor, pressure sensor connect with signal with described control system respectively, and described temperature sensor and pressure sensor can be with the temperature t that records
Gc, o, p in time is transferred to described control system, described control system can be according to the described t that receives
Gc, o, the p value judges whether it meets p=131.3-8.39t
Gc, o+ 0.31t
2 Gc, o-27.6 * 10
-4t
3 Gc, oIf, meet, then continue operation; If do not meet, the running parameter that described control system will control to adjust at least one parts in the blower fan, water pump of described electric expansion valve, evaporimeter makes the pressure carbon dioxide p of described exhaust outlet of compressor place meet above-mentioned relation.
2. CO 2 trans-critical heat pump water heater according to claim 1, it is characterized in that: described compressor is semiclosed reciprocating compressor.
3. CO 2 trans-critical heat pump water heater according to claim 1, it is characterized in that: the import department of described compressor is provided with low pressure controller, the exit is provided with dual pressure controller.
4. CO 2 trans-critical heat pump water heater according to claim 1 is characterized in that: be set side by side with stop valve mutually with described electric expansion valve.
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| CN201310218004.2A CN103292465B (en) | 2013-06-04 | 2013-06-04 | Trans-critical carbon dioxide heat pump water heater |
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| CN201310218004.2A CN103292465B (en) | 2013-06-04 | 2013-06-04 | Trans-critical carbon dioxide heat pump water heater |
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| CN103292465B CN103292465B (en) | 2016-08-10 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103940148A (en) * | 2014-05-04 | 2014-07-23 | 江苏苏净集团有限公司 | Carbon dioxide heat pump system and control method thereof |
| CN106196595A (en) * | 2015-04-29 | 2016-12-07 | 江苏白雪电器股份有限公司 | Carbon dioxide heat pump water heater and leaving water temperature control method thereof |
| CN107883575A (en) * | 2017-12-04 | 2018-04-06 | 广东纽恩泰新能源科技发展有限公司 | Air energy heat pump water heater |
| CN108775733A (en) * | 2018-04-17 | 2018-11-09 | 西安交通大学 | Trans-critical cycle CO2The limit of the heat pump system based on security feature fills amount control method |
| CN110160294A (en) * | 2019-05-17 | 2019-08-23 | 中车大连机车研究所有限公司 | One kind being used for CO2The control method for electronic expansion valve of refrigerant air-conditioning |
| CN111623547A (en) * | 2020-05-13 | 2020-09-04 | 东南大学 | Compressor frequency control method of transcritical carbon dioxide heat pump hot water system |
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| CN201514040U (en) * | 2009-07-27 | 2010-06-23 | 珠海格力电器股份有限公司 | Carbon dioxide heat pump water heater |
| CN102313358A (en) * | 2010-07-01 | 2012-01-11 | 珠海格力节能环保制冷技术研究中心有限公司 | Control method for exhaust pressure of carbon-dioxide heat-pump water heater |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103940148A (en) * | 2014-05-04 | 2014-07-23 | 江苏苏净集团有限公司 | Carbon dioxide heat pump system and control method thereof |
| CN106196595A (en) * | 2015-04-29 | 2016-12-07 | 江苏白雪电器股份有限公司 | Carbon dioxide heat pump water heater and leaving water temperature control method thereof |
| CN107883575A (en) * | 2017-12-04 | 2018-04-06 | 广东纽恩泰新能源科技发展有限公司 | Air energy heat pump water heater |
| CN108775733A (en) * | 2018-04-17 | 2018-11-09 | 西安交通大学 | Trans-critical cycle CO2The limit of the heat pump system based on security feature fills amount control method |
| CN108775733B (en) * | 2018-04-17 | 2020-05-19 | 西安交通大学 | Transcritical CO2Limit charge amount control method of heat pump system based on safety characteristic |
| CN110160294A (en) * | 2019-05-17 | 2019-08-23 | 中车大连机车研究所有限公司 | One kind being used for CO2The control method for electronic expansion valve of refrigerant air-conditioning |
| CN111623547A (en) * | 2020-05-13 | 2020-09-04 | 东南大学 | Compressor frequency control method of transcritical carbon dioxide heat pump hot water system |
| CN111623547B (en) * | 2020-05-13 | 2021-07-20 | 东南大学 | Compressor frequency control method of transcritical carbon dioxide heat pump hot water system |
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| CN103292465B (en) | 2016-08-10 |
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