CN103292465B - Trans-critical carbon dioxide heat pump water heater - Google Patents
Trans-critical carbon dioxide heat pump water heater Download PDFInfo
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- CN103292465B CN103292465B CN201310218004.2A CN201310218004A CN103292465B CN 103292465 B CN103292465 B CN 103292465B CN 201310218004 A CN201310218004 A CN 201310218004A CN 103292465 B CN103292465 B CN 103292465B
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Abstract
The open a kind of trans-critical carbon dioxide heat pump water heater of the present invention, including control system, compressor, air cooler, filter, electric expansion valve, the vaporizer with blower fan, water pump, the exhaust ports of air cooler is provided with temperature sensor, the gas outlet of compressor goes out to be provided with pressure transducer, temperature t that temperature sensor and pressure transducer can will recordgc,o, p be transferred to control system in time, can be according to the t received in control systemgc,o, p value judge whether it meets p=131.3 8.39tgc,o+0.31t2 gc,o‑27.6×10‑ 4t3 gc,oIf met, then continue to run with；If do not met, at least one parts in control and regulation electric expansion valve, the blower fan of vaporizer, water pump are made pressure carbon dioxide p at exhaust outlet of compressor meet above-mentioned relation by control system.This carbon dioxide heat pump water heater at work, can have superior performance coefficient always.
Description
Technical field
The present invention relates to a kind of trans-critical carbon dioxide heat pump water heater.
Background technology
In prior art, carbon dioxide heat-pump is owing to using carbon dioxide as refrigerant, it is nontoxic, nonflammable, side effect to environment is little and cheap, but, using carbon dioxide the most inefficient, the technological difficulties being 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 vaporizer with blower fan, fluid reservoir.Carbon dioxide working medium enters compressor, the carbon dioxide being compressed into High Temperature High Pressure enters air cooler, and be cooled, the heat of its release makes to be heated by the cold water of this cooler, after air cooler, carbon dioxide enters filter the most again through electric expansion valve throttling cooling partial gasification, and moist steam becomes gas-liquid mixture after entering vaporizer, is again introduced into compressor and completes a circulation after then entering fluid reservoir.In the cycle, pressure carbon dioxide at exhaust outlet of compressor 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 optimal, understands, air cooler exhaust ports carbon dioxide temperature t in prior artgc,oPressure carbon dioxide at exhaust outlet of compressor is had significant impact, and how making the pressure carbon dioxide at exhaust outlet of compressor is the difficult problem that optimum discharge pressure is always carbon dioxide heat-pump industry.
Summary of the invention
It is an object of the invention to provide a kind of trans-critical carbon dioxide heat pump water heater with higher heating energy efficiency ratio COP.
nullFor solving above-mentioned technical problem，The present invention adopts the following technical scheme that a kind of trans-critical carbon dioxide heat pump water heater，Including carbon dioxide heat pump system、Hot water supply system and control system，Described carbon dioxide heat pump system includes the compressor set gradually、Air cooler、Filter、Electric expansion valve、Vaporizer with blower fan、Fluid reservoir，There is inside described air cooler gas path and water passage，Described hot water supply system includes supply channel，Described supply channel has cold water inlet、Water pump、Hot water outlet，Described cold water inlet with hot water outlet respectively two ends with the water passage of described air cooler be connected，The air inlet of the gas path of described air cooler is connected with the air vent of described compressor、The air vent of gas path is connected with the entrance of electric expansion valve，Described filter is between gas path air vent and the electronic expansion valve inlet of described air cooler，The described water in supply channel carries out heat exchange with the carbon dioxide in the gas path entering air cooler in described air cooler，Described electric expansion valve、The blower fan of vaporizer、The control system phase control connection that water pump is uniformly described，The exhaust ports of described air cooler is provided with for detecting air cooler exhaust ports carbon dioxide temperature tgc,oTemperature sensor, the exhaust ports of described compressor is provided with the pressure transducer for detecting this exhaust ports pressure carbon dioxide p, described temperature sensor, pressure transducer connect with signal with described control system respectively, temperature t that described temperature sensor and pressure transducer can will recordgc,o, p be transferred to described control system in time, described control system can be according to the t described in receivinggc,o, p value judge whether it meets p=131.3-8.39tgc,o +0.31t2 gc,o-27.6×10-4 t3 gc,oIf met, then continue to run with；If do not met, the running parameter of at least one parts in the electric expansion valve described in control and regulation, the blower fan of vaporizer, water pump is made pressure carbon dioxide p at described exhaust outlet of compressor meet above-mentioned relation by described control system.
In technique scheme, it is preferable that described compressor is semiclosed reciprocating compressor.
In technique scheme, it is preferable that the import department of described compressor is provided with low pressure controller, exit is provided with dual pressure controller.
In technique scheme, it is preferable that be set side by side with stop valve mutually with described electric expansion valve.
The beneficial effects of the present invention is: regulate the pressure carbon dioxide at exhaust outlet of compressor in real time by the air cooler exhaust ports carbon dioxide temperature recorded according to temperature sensor, reach optimum discharge pressure, so that carbon dioxide heat pump water heater is in the course of the work, can have higher heating energy efficiency ratio always.
Accompanying drawing explanation
Accompanying drawing 1 is the schematic diagram of the supercritical carbon dioxide Teat pump boiler of the present invention；
Accompanying drawing 2 is the running figure of the supercritical carbon dioxide Teat pump boiler of the present invention；
Accompanying drawing 3 is the control figure of the compressor outlet of the present invention；
Accompanying drawing 4 is empirical value and the comparison diagram of theoretical value of the COP of the trans-critical carbon dioxide heat pump water heater of the present invention；
In accompanying drawing: 1, carbon dioxide heat pump system；11, compressor；12, air cooler；13, filter；14, electric expansion valve；15, blower fan；16, vaporizer；17, fluid reservoir；18, low pressure controller；19, dual pressure controller；110, stop valve；111, electromagnetic valve；2, hot water supply system；21, supply channel；22, cold water inlet；23, water pump；24, hot water outlet；112, carbon dioxide bypass.
Detailed description of the invention
The present invention is described in detail below by the embodiment shown in below in conjunction with the accompanying drawings:
Supercritical carbon dioxide Teat pump boiler as shown in Figure 1, it uses carbon dioxide to be working medium, and it is mainly by carbon dioxide heat pump system 1, hot water supply system 2 and control system (not shown).Compressor 11 that carbon dioxide heat pump system 1 includes setting gradually, air cooler 12, filter 13, electric expansion valve 14, the vaporizer 16 with blower fan 15, fluid reservoir 17.Hot water supply system 2 includes that supply channel 21, supply channel 21 have cold water inlet 22, water pump 23, hot water outlet 24.The internal water passage with the gas path for carbon dioxide stream passes and circulation of supplying water of air cooler 12, cold water inlet 22 and hot water outlet 24 are connected with arrival end and the port of export 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 air vent of the gas path of air cooler 12 communicates with the arrival end of electric expansion valve 14, and filter 13 is arranged between air vent and the arrival end of electric expansion valve 14 of the gas path of air cooler 12.The carbon dioxide that water in supply channel 21 flows in the water passage flow process of air cooler 12 and in gas path carries out heat exchange.Being set side by side with stop valve 110 at electric expansion valve 14 mutually, the carbon dioxide flow flowed within electric expansion valve 14 can be adjusted by stop valve 110.The port of export of electric expansion valve 14 is connected with the arrival end of vaporizer 16, and the port of export of vaporizer 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.It addition, be additionally provided with one to be communicated to electric expansion valve and the carbon dioxide bypass 112 vaporizer communication path from the exit of compressor 11, for the carbon dioxide flow in regulation of carbon dioxide bypass 113, at this, bypass is additionally provided with an electromagnetic valve 111.
Electric expansion valve 14, the blower fan 15 of vaporizer 16, water pump 23 are all connected with control system phase control.Wherein, compressor 11 is semiclosed reciprocating compressor.The import department of compressor 11 is provided with low pressure controller 18, exit is provided with dual pressure controller 19.
In order to monitor the carbon dioxide exhaust port temperatures of air cooler, it is provided with user in the exit of the gas path of air cooler 12 and detects air cooler exhaust ports carbon dioxide temperature tgc,oTemperature sensor (not shown), additionally, exhaust ports at compressor 11 is provided with for detecting the pressure transducer of pressure carbon dioxide p at exhaust outlet of compressor, temperature sensor, pressure transducer connect with signal with control system respectively, temperature t that temperature sensor and pressure transducer can will recordgc,o, p be transferred to described control system in time.
The workflow of this Teat pump boiler is as follows: the carbon dioxide in fluid reservoir 17 enters compressor 11, the carbon dioxide of High Temperature High Pressure is become after the compression of compressor 11, the carbon dioxide of High Temperature High Pressure subsequently enters the gas path of air cooler 12, the water flow through with water passage in air cooler 12 carries out heat exchange, water absorption heat is heated then to be flowed out by hot water outlet 24, the carbon dioxide of High Temperature High Pressure is cooled to be got rid of from air vent, after filter 13 filters, then enter electric expansion valve 14 throttling cooling and partial gasification becomes moist steam, moist steam enters vaporizer 16 and becomes gas-liquid mixture with air heat-exchange, after fluid reservoir 17 reclaims, again change the carbon dioxide in low-temp low-pressure enter compressor 11.Wherein, the gas outlet pressure of compressor 11 can be regulated by the speed regulating the blower fan 15 of the flow of water pump 23, the aperture of electric expansion valve 14, vaporizer 16.
The control figure of compressor outlet as shown in Figure 2:
The first step, water heater unlatching work；
Second step, control system receive temperature sensor and issue temperature t of control systemgc,o ,Now control system is according to formula p=131.3-8.39tgc,o +0.31t2 gc,o-27.6×10-4 t3 gc,oCalculate the optimum pressure at the gas outlet of compressor, the current compressor exhaust ports pressure carbon dioxide of the pressure transducer real-time Transmission received with control system again is the most consistent, if it is consistent, then illustrate that now all parts parameter can make the heating energy efficiency ratio COP of Teat pump boiler reach optimal in Teat pump boiler, if it is inconsistent, make pressure carbon dioxide p at exhaust outlet of compressor meet above-mentioned relation according at least one parts in the water pump in method regulation electric expansion valve, the blower fan of vaporizer, the water supply system shown in accompanying drawing 3.As it is shown on figure 3, when regulation of carbon dioxide pressure P, the preferential aperture regulating electric expansion valve, it is followed by the fan speed of vaporizer, is finally the regulation of pump capacity.
As shown in Figure 4, this works at different ambient temperatures for this carbon dioxide heat pump water heater, the deviation between the COP value of its reality and theory optimal COP value.Thus figure understands, and the COP value in its work process of the carbon dioxide heat pump water heater of the present invention and optimal COP value anticipated in theory are almost without deviation, and optimal COP value the most anticipated for the COP of carbon dioxide heat pump water heater in prior art.
Above-described embodiment only for technology design and the feature of the present invention are described, its object is to allow person skilled in the art will appreciate that present disclosure and to implement according to this, can not limit the scope of the invention with this.All equivalence changes made according to present invention spirit or modification, all should contain within protection scope of the present invention.Within bright protection domain.
Claims (4)
- null1. a trans-critical carbon dioxide heat pump water heater，Including carbon dioxide heat pump system、Hot water supply system and control system，Described carbon dioxide heat pump system includes the compressor set gradually、Air cooler、Filter、Electric expansion valve、Vaporizer with blower fan、Fluid reservoir，There is inside described air cooler gas path and water passage，Described hot water supply system includes supply channel，Described supply channel has cold water inlet、Water pump、Hot water outlet，Described cold water inlet with hot water outlet respectively two ends with the water passage of described air cooler be connected，The air inlet of the gas path of described air cooler is connected with the air vent of described compressor、The air vent of gas path is connected with the entrance of electric expansion valve，Described filter is between gas path air vent and the electronic expansion valve inlet of described air cooler，The described water in supply channel carries out heat exchange with the carbon dioxide in the gas path entering air cooler in described air cooler，Described electric expansion valve、The blower fan of vaporizer、Water pump all with Described control system phase control connects, it is characterised in that: the exhaust ports of described air cooler is provided with for detecting air cooler exhaust ports carbon dioxide temperature tgc,oTemperature sensor, the exhaust ports of described compressor is provided with the pressure transducer for detecting this exhaust ports pressure carbon dioxide p, described temperature sensor, pressure transducer connect with signal with described control system respectively, temperature t that described temperature sensor and pressure transducer can will recordgc,o, p be transferred to described control system in time, described control system can be according to the t described in receivinggc,o, p value judge whether it meets p=131.3-8.39tgc,o +0.31t2 gc,o-27.6×10-4 t3 gc,oIf met, then continue to run with；If do not met, the running parameter of at least one parts in the electric expansion valve described in control and regulation, the blower fan of vaporizer, water pump is made pressure carbon dioxide p at described exhaust outlet of compressor meet above-mentioned relation by described control system.
- Trans-critical carbon dioxide heat pump water heater the most according to claim 1, it is characterised in that: described compressor is semiclosed reciprocating compressor.
- Trans-critical carbon dioxide heat pump water heater the most according to claim 1, it is characterised in that: the import department of described compressor is provided with low pressure controller, exit is provided with dual pressure controller.
- Trans-critical carbon dioxide heat pump water heater the most according to claim 1, it is characterised in that: it is 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 true CN103292465B (en) | 2016-08-10 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103940148B (en) * | 2014-05-04 | 2016-06-29 | 江苏苏净集团有限公司 | A kind of 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 |
| 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 |
| 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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| CN101240962A (en) * | 2008-01-18 | 2008-08-13 | 西安交通大学 | Carbon dioxide heat pump control method based on pressure-temperature |
| 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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2013
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Patent Citations (3)
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| CN101240962A (en) * | 2008-01-18 | 2008-08-13 | 西安交通大学 | Carbon dioxide heat pump control method based on pressure-temperature |
| 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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| A correlation of optimal heat rejection pressures in transcritical carbon dioxide cycles;S.M.Liao,T.S.Zhao,A.Jakobsen;《PERGAMON》;20001231;全文 * |
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