CN102352219A - Binary mixed working medium for self-cascade solar energy low-temperature Rankine cycle system - Google Patents
Binary mixed working medium for self-cascade solar energy low-temperature Rankine cycle system Download PDFInfo
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- CN102352219A CN102352219A CN2011102200210A CN201110220021A CN102352219A CN 102352219 A CN102352219 A CN 102352219A CN 2011102200210 A CN2011102200210 A CN 2011102200210A CN 201110220021 A CN201110220021 A CN 201110220021A CN 102352219 A CN102352219 A CN 102352219A
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Abstract
The invention discloses a binary mixed working medium for a self-cascade solar energy low-temperature Rankine cycle system, wherein the evaporation temperature of the binary mixed working medium is 90 DEG C-150 DEG C. The binary mixed working medium comprises isopentane and 1, 1, 1, 3, 3-pentafluoropropane the weight ratio of which is 30-80/20-70, and the two components are physically mixed at the normal temperature according to the specified mixture ratio. The working medium causes zero damage to an ozone layer, the greenhouse effect is lower, the working medium is in line with the environmental protection requirements, and the thermal engineering parameters and the cycle performance are excellent. When the working medium is used, an ordinary solar heat collector can be adopted in the self-cascade solar energy low-temperature Rankine cycle system, and the Rankine cycle efficiency of the system and the thermal efficiency of the system can simultaneously achieve the higher level.
Description
Technical field
The invention belongs to the refrigeration agent in refrigeration or the air-conditioning system, be specifically related to a kind of vaporization temperature and be 90-150 ℃ the hybrid refrigeration working medium of sun power in the overlapping Rankine cycle system.
Background technology
Employing is the solar energy utilization technique on basis with the Rankine cycle, not only can effectively utilize solar energy resources, reduces CO
2Discharging reduces Greenhouse effect, can also reduce manufacturing cost effectively.The direction of current solar low-temperature Rankine cycle technology develops the efficient that is to improve system, but one of key issue that runs into is exactly to lack the cycle fluid that is fit to.At present the working medium used of solar low temperature ranking cycle system is pure matter mostly, or is the alkanes material of representative with butane, pentane etc., and other classification working medium have R134a, ammonia etc.Though alkanes material circulation heating power better performances is extremely inflammable and explosive, has higher danger, thereby has limited it and further applied.Working medium such as R134a, ammonia circulating pressure level is higher, in the practical application solar energy collector withstand voltage properties is had relatively high expectations, and ordinary solar heat collector is difficult to use.Therefore, the novel working medium that development environment is friendly, thermal performance is good, practical application is safe and reliable is most important to the development of solar low-temperature Rankine cycle technology.
Summary of the invention
The objective of the invention is, it is 90-150 ℃ of hybrid refrigeration working medium that is applicable to sun power from the overlapping Rankine cycle system that a kind of vaporization temperature is provided.
Be used for the binary mixing medium from the overlapping solar low temperature ranking cycle system, by iso-pentane and 1,1,1,3, the 3-pentafluoropropane is formed, and the quality percentage is: 30-80/20-70, two constituent element material mass percentage ratio sums equal 100%.The basic parameter of two constituent element materials is as shown in table 1.Preparing method of the present invention is that two constituent element materials are carried out physical mixed at normal temperatures by its specified quality proportioning.
The present invention has following some beneficial effect:
(1) compliance with environmental protection requirements: ODP is zero, and GWP is also very low.(2) thermal parameter is suitable: under design conditions, stress level is lower, and is therefore lower to the bearing capacity and the sealing requirements of system device, can reduce system cost.(3) cycle performance is good: the Rankine cycle efficient of the present invention under design conditions is greater than 10%, and unit mass circulation net work work output is more than the 50kJ/kg basically.(4) the cycling hot utilization ratio is higher: the present invention is a non-azeotropic mixed working medium; In phase transition process, there is temperature glide, reduces inner irreversible loss, when having internal exchanger in the system; Can effectively improve the recovery utilization rate of decompressor exhaust steam residual heat, thereby improve system thermal efficiency.
The contained constituent element basic parameter of this system's mixing medium of table 1
T
b: normal boiling point, T
c: critical temperature, P
c: emergent pressure
Embodiment
Embodiment 1: get 20
Mass%HFC-245fa, 80
Mass%R601a mixes the back at normal temperatures as cycle fluid.
Embodiment 2: get 32
Msaa%HFC-245fa, 68
Mass%R601a mixes the back at normal temperatures as cycle fluid.
Embodiment 3: get 50
Mass%HFC-245fa, 50
Mass%R601a mixes the back at normal temperatures as cycle fluid.
Embodiment 4: get 70
Mass%HFC-245fa, 30
Mass%R601a mixes the back at normal temperatures as cycle fluid.
Average operating mode from the overlapping solar low temperature ranking cycle system is taken as: 90 ℃ of first step heat collector temperature outs, and 150 ℃ of second stage heat collector temperature outs, 30 ℃ of condensing temperatures, pump pressure compression process and expansion process are isoentropic process.By experiment and calculate, above-mentioned 4 embodiment have related parameter and cycle performance index as shown in table 2.
Four embodiment cycle performances of table 2
Claims (1)
1. be used for binary mixing medium, it is characterized in that said mixing medium is by iso-pentane and 1,1 from the overlapping solar low temperature ranking cycle system; 1,3, the 3-pentafluoropropane is formed; The quality percentage is: 30-80/20-70, two constituent element material mass percentage ratio sums equal 100%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011102200210A CN102352219A (en) | 2011-08-02 | 2011-08-02 | Binary mixed working medium for self-cascade solar energy low-temperature Rankine cycle system |
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| CN2011102200210A CN102352219A (en) | 2011-08-02 | 2011-08-02 | Binary mixed working medium for self-cascade solar energy low-temperature Rankine cycle system |
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| CN102352219A true CN102352219A (en) | 2012-02-15 |
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| CN2011102200210A Pending CN102352219A (en) | 2011-08-02 | 2011-08-02 | Binary mixed working medium for self-cascade solar energy low-temperature Rankine cycle system |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1219945A (en) * | 1996-04-10 | 1999-06-16 | 联合信号公司 | Azeotrope-like compositions of 1,1,1,3,3-pentafluoropropane and hydrocarbons |
| WO2010081990A1 (en) * | 2009-01-14 | 2010-07-22 | Arkema France | Heat transfer method |
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2011
- 2011-08-02 CN CN2011102200210A patent/CN102352219A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1219945A (en) * | 1996-04-10 | 1999-06-16 | 联合信号公司 | Azeotrope-like compositions of 1,1,1,3,3-pentafluoropropane and hydrocarbons |
| WO2010081990A1 (en) * | 2009-01-14 | 2010-07-22 | Arkema France | Heat transfer method |
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Application publication date: 20120215 |