CN102504764A - Environment-friendly refrigerant applicable to heat pump system of gas engine - Google Patents
Environment-friendly refrigerant applicable to heat pump system of gas engine Download PDFInfo
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- CN102504764A CN102504764A CN2011103500570A CN201110350057A CN102504764A CN 102504764 A CN102504764 A CN 102504764A CN 2011103500570 A CN2011103500570 A CN 2011103500570A CN 201110350057 A CN201110350057 A CN 201110350057A CN 102504764 A CN102504764 A CN 102504764A
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- refrigerant
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The invention discloses an environment-friendly refrigerant applicable to a heat pump system of a gas engine, which is composed of an HFC-152a (Hydrofluorocarbon-152a) and an HFC-134a (Hydrofluorocarbon-134a) and is characterized in that: a specific mass percentage proportion of two groups of element materials is as follows: the HFC-152a to the HFC-134a is 5-50% to 50-95% and the sum of the mass percentages of the mixed two groups of the element materials is 100%. A preparation method of the environment-friendly refrigerant comprises the step of physically mixing the two groups of the element materials at a room temperature according to an appointed proportion. The environment-friendly refrigerant provided by the invention has the characteristics of zero ODP (Ozone Depression Potential), lower GWP (Global Warming Potential), small temperature slippage, good thermodynamic performance, good market availability and the like; the environment-friendly refrigerant can be directly injected into the traditional gas-turbine driven heat pump using an R134a refrigerant, excessive component exchange is not needed and lubricating oil is not need to be repeatedly injected. According to the invention, the requirement on an outlet water temperature can be met and the environment-friendly refrigerant has the advantages of good coefficient of performance and energy-saving effects.
Description
Technical field
The invention belongs to the refrigeration agent in heat pump or refrigeration, the air-conditioning system, especially be suitable as the refrigeration working medium in the gas engine heat pump system.
Background technology
After Kyoto Protocol in 1997, in September, 2007, international community in Montreal protocol further reached the decision of quickening to eliminate global warming potential (GWP) higher H CFCs class refrigeration agent again.As the surrogate of CFCs class refrigeration agent, the R134a refrigeration agent once was widely used in field of Refrigeration and Air-conditioning with its outstanding over-all properties, but listed restricted gas list in because having higher GWP value.China is air-conditioning heat pump big producing country, for protection environment, enhancing China's refrigeration air-conditioner product competitive power in the international market, must quicken the superseded process of high GWP value refrigeration agent.
Gas engine heat pump system is a kind of energy-efficient refrigeration and heating equipment, and the refrigeration agent that is applied at present in the gas-fired heat pump does not have hydrocarbon type of inflammable (HCs) natural refrigerant basically.Thermomechanical property R134a and R407C etc. preferably all has high GWP value, is not suitable for secular promoting the use of.Taking all factors into consideration under the factors such as the thermomechanical property of alternative refrigerant, environmental performance and direct perfusion, the present invention proposes nearly azeotropic two-component mixture R152a/R134a as the gas-fired heat pump alternative refrigerants.
Summary of the invention
The purpose of this invention is to provide a kind of refrigeration working medium that is suitable in the gas engine heat pump system, make its environmental characteristics and cycle performance all good.
Be applicable to the environmental protection refrigerant of gas engine heat pump system; By HFC-152a (1, the 1-C2H4F2 C2H4F2) and HFC-134a (1,1; 1; The 2-Tetrafluoroethane) form, it is characterized in that the concrete mass percent proportioning of two constituent element materials is: HFC-152a/HFC-134a:5-50/50-95%, blended two constituent element material mass percentage ratio sums are 100%.
The preparation method of environmental protection refrigerant according to the invention is two constituent element materials to be carried out physical mixed at normal temperatures by its specified quality proportioning get final product.
The present invention has the following advantages and beneficial effect:
Characteristics such as have ODP and be zero, GWP is lower, temperature glide is little, thermomechanical property is good and the market availability is good; Can directly fill in the gas-burning machine heat pump of original use R134a refrigeration agent; Need not do too much part replacement, more not need heavily to annotate lubricating oil.And when satisfying the leaving water temperature(LWT) demand, have the good coefficient of performance and an energy-saving effect.
The basic physical properties such as the table 1 of two kinds of constituent elements:
The basic parameter of contained constituent element in the environmental protection refrigerant of table 1 gas engine heat pump system
T
b: normal boiling point, T
c: critical temperature, P
c: emergent pressure
Embodiment
Through specific embodiment the present invention is explained in detail below.(annotate: the prescription of part embodiment has certain combustibility).
Embodiment 1: get 10
Mass%HFC-152a, 90
Mass%HFC-134a, with after the physical mixed under these two kinds of component normal temperature as refrigeration agent.
Embodiment 2: get 20
Mass%HFC-152a, 80
Mass%HFC-134a, with after the physical mixed under these two kinds of component normal temperature as refrigeration agent.
Embodiment 3: get 30
Mass%HFC-152a, 70
Mass%HFC-134a, with after the physical mixed under these two kinds of component normal temperature as refrigeration agent.
Embodiment 4: get 40
Mass%HFC-152a, 60
Mass%HFC-134a, with after the physical mixed under these two kinds of component normal temperature as refrigeration agent.
Embodiment 5: get 50
Mass%HFC-152a, 50
Mass%HFC-134a, with after the physical mixed under these two kinds of component normal temperature as refrigeration agent.
Above-mentioned 5 embodiment have related parameter and cycle performance index as shown in table 2:
Refrigeration agent basic physical properties calculation of parameter value among table 2 embodiment 1～5
| ? | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 |
| Relative molecular mass g/mol | 96.761 | 92.008 | 87.7 | 83.777 | 80.19 |
| Critical temperature ℃ | 102.79 | 104.37 | 105.82 | 107.14 | 108.36 |
| Emergent pressure MPa | 4.1086 | 4.1584 | 4.2079 | 4.2564 | 4.3037 |
The design conditions of heat pump are taken as: condensing temperature=54.4 ℃; Vaporization temperature=7.2 ℃; Superheating temperature=24.8 ℃; Condensate depression=8.3 ℃; Compressor heat insulating ability 0.95, volumetric efficiency 0.95; Refrigerating duty 40Kw.
The refrigeration cycle performance perameter of above-mentioned embodiment of Theoretical Calculation and R134a comprises refrigerating effect per unit swept volume, compressor exhaust temperature, condensing pressure and system performance coefficient etc., and is as shown in the table.
5 embodiment of table 3 the present invention and R134a performance are relatively
| Parameter and performance | R134a | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 |
| Evaporating pressure/MPa | 0.3772 | 0.3658 | 0.3577 | 0.3518 | 0.3475 | 0.3444 |
| Condensing pressure/MPa | 1.4698 | 1.4361 | 1.4085 | 1.386 | 1.3677 | 1.3529 |
| Pressure ratio | 3.9 | 3.93 | 3.94 | 3.94 | 3.94 | 3.93 |
| Exhaust temperature/℃ | 85.4 | 87 | 88.3 | 89.5 | 90.6 | 91.6 |
| COP | 4.451 | 4.45 | 4.455 | 4.463 | 4.471 | 4.479 |
| Heat supplied/kw | 48.987 | 48.989 | 48.978 | 48.962 | 48.946 | 48.931 |
| Refrigerating effect per unit swept volume/kJ/m 3 | 2467.3 | 2414.4 | 2377.2 | 2350.3 | 2330.8 | 2316.6 |
| Unit volume heating capacity/kJ/m 3 | 3021.6 | 2957 | 2910.8 | 2876.9 | 2852. | 2833.8 |
| ODP | 0 | 0 | 0 | 0 | 0 | 0 |
| GWP | 1300 | 249.7 | 366.4 | 483.1 | 599.8 | 716.5 |
The result shows: though compare with R134a new working medium the unit volume refrigeration heating capacity reduce slightly, the coefficient of performance of total system but is improved, and explains that new working medium has energy-efficient advantage.Can also find out that by calculation result the exhaust temperature of compressor slightly improves, and condensing pressure descends slightly.Condensing pressure is low more, helps the security of system more, and refrigeration agent saturation vapour pressure and the R134a saturation vapour pressure among the embodiment 1～5 also pressed close to very much simultaneously, and this has proved the feasibility that adopts direct filling type replacement scheme from the system pressure angle.
As nearly azeotropic mixture, the refrigerant temperature slippage among the embodiment 1～5 is very little.In 0～3MPa pressure range, the minimum temperature slippage is 0.017 ℃, and the maximum temperature slippage is no more than 0.12 ℃, has well nearly azeotropic effect.Therefore the present invention is keeping new working medium stability, is preventing to have than remarkable advantages aspect the composition variation because of accidental release produces.
In order further to understand the performance characteristics that new working medium is applied to the gas-burning machine heat pump testing table; In summer, respectively air-the gas engine heat pump system of water form based on pure refrigerant R134a and mix refrigerant R152a/R134a has been carried out the experimental study of refrigeration performance; In the winter time, carried out the experimental study of gas-burning machine heat pump heating performance to new working medium again.Refrigeration and heating condition PT result show: this gas engine heat pump system is used novel environment-friendly refrigerant of the present invention can obtain the higher coefficient of performance and primary energy ratio.
In experimental study, find; The compressor wasted work with gas engine change in rotational speed rule is during cooling condition: at the gas engine rotating speed is between 1300～1600rpm; The compressor wasted work difference of mix refrigerant R152a/R134a and R134a is little; And when the gas engine rotating speed was elevated to 1900rpm, mix refrigerant R152a/R134a compressor wasted work reduced about 1kW than R134a coolant compressor wasted work, generally speaking; Adopt the compressor wasted work of mix refrigerant R152a/R134a little, more help energy saving of system than R134a.
System performance coefficient when gas-burning machine heat pump uses R134a and R152a/R134a respectively during to cooling condition is studied with the dynamic rule of inflow temperature; Can obtain: when the vaporizer inflow temperature is in 11.47～20.8 ℃; Use systems under the mixing medium R152/R134a situation can raising about 2%～4%, the energy-saving effect that new working medium is good is described.
Make an experiment to the Changing Pattern of system's heat supply leaving water temperature(LWT) with the condensing surface inflow temperature.Can sum up: the heat supply leaving water temperature(LWT) raises with the rising of condensing surface inflow temperature.When the condensing surface inflow temperature was 36 ℃, the heat supply leaving water temperature(LWT) reached 50 ℃, and when the condensing surface inflow temperature was 41 ℃, the heat supply leaving water temperature(LWT) can reach 55.1 ℃, and heat supply temperature is further promoted.
From the cascaded utilization of energy angle, the coefficient of performance COPt just experimental study respectively after using the gas engine heat pump system coefficient of performance COP of new working medium during to heating condition and considering to reclaim the gas engine waste heat.The result shows that when the condensing surface inflow temperature was 41 ℃, COP and COPt were higher than 3.45 and 6.01 respectively, shows the good performance and the characteristics of total energy approach.
Claims (1)
1. be applicable to the environmental protection refrigerant of gas engine heat pump system; By HFC-152a (1, the 1-C2H4F2 C2H4F2) and HFC-134a (1,1; 1; The 2-Tetrafluoroethane) form, it is characterized in that the concrete mass percent proportioning of two constituent element materials is: HFC-152a/HFC-134a:5-50/50-95%, blended two constituent element material mass percentage ratio sums are 100%.
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|---|---|---|---|
| CN2011103500570A CN102504764A (en) | 2011-11-08 | 2011-11-08 | Environment-friendly refrigerant applicable to heat pump system of gas engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019228094A1 (en) * | 2018-05-30 | 2019-12-05 | Wang Binhui | Medium-high temperature heat pump mixed working medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1563255A (en) * | 2004-04-05 | 2005-01-12 | 天津大学 | A group of mixed working media containing HFCs and HPCs for mid-high temperature heat pump |
| CN101006154A (en) * | 2004-08-25 | 2007-07-25 | 咸允植 | R502, r12 or r22 substitute mixed refrigerant and refrigeration system using thereof |
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2011
- 2011-11-08 CN CN2011103500570A patent/CN102504764A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1563255A (en) * | 2004-04-05 | 2005-01-12 | 天津大学 | A group of mixed working media containing HFCs and HPCs for mid-high temperature heat pump |
| CN101006154A (en) * | 2004-08-25 | 2007-07-25 | 咸允植 | R502, r12 or r22 substitute mixed refrigerant and refrigeration system using thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019228094A1 (en) * | 2018-05-30 | 2019-12-05 | Wang Binhui | Medium-high temperature heat pump mixed working medium |
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Application publication date: 20120620 |