[논문]저온용 대체냉매의 성능 특성 연구

신정섭; 김만회

doi:10.7316/khnes.2016.27.4.462

저온용 대체냉매의 성능 특성 연구
Performance Characteristics Study on an Alternative Refrigerant in Low Temperature Applications 원문보기

한국수소 및 신에너지학회 논문집 = Transactions of the Korean Hydrogen and New Energy Society, v.27 no.4, 2016년, pp.462 - 469

Abstract ▼ AI-Helper

This paper presents the results of thermodynamic cycle analysis and performance tests of alternative mixtures in low temperature applications. Two near-azeotropic binary mixtures R-152a/R-1270 (35:65 by wt.%) and R-290/E170 (35:65 by wt.%) are considered in this study. They have zero ODP (Ozone Depletion Potential) and much lower GWP (Global Warming Potential) than R-404A which is an alternative of R-502. Refrigeration cycle characteristics such as cooling capacity, coefficient of performance, suction and discharge pressures and temperatures are compared to those for the baseline refrigerants (R-502 and R-404A) cycles. The performance tests are conducted at the evaporation and condensation temperatures of $5^{\circ}C$ and $45^{\circ}C$, subcooling and superheating temperatures of $5^{\circ}C$, respectively. Performance comparisons between baseline and alternative refrigerants are conducted on the same cooling capacity. The system performance of newly proposed refrigerant mixtures show promising results.

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문제 정의

The objective of the analysis is to find new environmentally friendly near- azeotropic mixtures that are likely to show higher performance than the R-502 and the R-404A system at the same operating conditions. This analysis was performed under ASHRAE LBP (low back pressure) test condition and subroutines of the NIST database REFPROP 9.
This paper presents the characteristics and performance of long-term R-502 alternative refrigerants. Theoretical cycle analysis has been performed using NIST REFPROP⁷⁾ and reported thermodynamic analysis results with two potential low GWP alternative refrigerants, R-502 and R-404A⁸⁾.

제안 방법

All of the information about the test conditions and test data were displayed on the monitor during the test, the test conditions were changed, based on this information. At steady state condition, 20 data points were collected during 120 seconds and averaged.
From this analysis with dozens of refrigerant mixtures, final two candidates were selected and then performance test was performed with the best candidate refrigerant mixture.
Performance tests were conducted with evaporation and condensation temperature of 5℃ and 45℃, respectively and subcooling and superheating temperatures of 5℃.
The analysis program automatically calculates the thermodynamic cycle up to five refrigerant mixtures by 1 weight % composition change steps. For example, ternary refrigerant mixture requires about 5000 compositions in analysis.
reported theoretical evaluation result of nine R-22 alternatives and three R-502 alternatives. Their study conducted with a semi-theoretical mode, CYCLE-11, with a pure cross-flow heat exchanger. Performance simulations were also conducted in a modified system equipped with a liquid-line/suction-line heat exchanger((LLSL-HX) cycle.

대상 데이터

R-404A and R-290/E170 (65/35 by wt.%) were used as the refrigerant. Table 6 shows that R-290/E170 (65/35 by wt.
%) requires much less charge than R-404A. The test data were collected using a data acquisition system consisting of a data logger, a serial communication (RS-232C), and a PC. The data were analyzed in real time using a PC and a data reduction program (MS-Excel with a Visual Basic).

이론/모형

The objective of the analysis is to find new environmentally friendly near- azeotropic mixtures that are likely to show higher performance than the R-502 and the R-404A system at the same operating conditions. This analysis was performed under ASHRAE LBP (low back pressure) test condition and subroutines of the NIST database REFPROP 9.1⁷⁾ were used to obtain thermodynamic properties of the refrigerant mixtures.

성능/효과

0°C. From the simulation data, R-1270/152a (65/35 by wt.%) and R-290/E170 (65/35 by wt.%) it is observed that they show better COP (coefficient of performance) than R-502 and R-404A. However the drawback of R-1270/152a (65/35 by wt.

참고문헌 (10)

M.-H. Kim, Global warming and alternative refrigerants technology, Magazine of SAREK, Vol. 36, No. 7, pp. 7-19, 2007.
A. Stegou-Sagia, N. Paignigiannis, Evaluation of mixtures efficiency in refrigerating systems, Energy Conversion and Management, Vol. 46, pp. 2787-2802, 2005.

상세보기
R. Camporese, G. Bigolaro, S. Bobbo, Experimental evaluation of refrigerant mixtures as substitutes for CFC12 and R502, International Journal of Refrigeration, Vol. 20, No. 1, pp. 22-31, 1997.

상세보기
P.A. Domanski, D.A. Didion, Theoretical evaluation of R22 and R502 alternatives, NIST Report Prepared for ARTI. MCLR Project 650-50900, 1993.
Y. Xuan, G. Chen, Experimental study on HFC-161 mixture as an alternative refrigerant to R502, International Journal of Refrigeration, Vol. 28, No. 3, pp. 436-441, 2005.

상세보기
European Parliament, "Regulation (EU) No 517/2014 of the European Parliament and of the Council on flourinated greenhouse gases," Off. J. Eur. Union, No. L150, pp. 195-230, 2014.
M. Huber, J. Gallagher, M. McLinden, G. Morrison, REFPROP 9.1, NIST Thermo- dynamic Properties of Refrigerants and Refrigerant Mixtures Database, 2009.
J.-S. Shin, M.-H. Kim, Performance evaluation of near-azeotropic R502 alternative refrigerants, The 7 th IIR Gustav Lorentzen Conference on Natural Working Fluids, Trondheim, Norway, 2006.
ASHRAE, Fundamentals, ASHRAE Handbook, Ch. 19-20, 2013.
S. Devotta, A.B. Waghmare, N.N. Sawant, B.M. Domkundwar, Alternatives to HCFC-22 for air conditioners, Applied Thermal Engineering, Vol. 21, pp. 703-715, 2001.

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저온용 대체냉매의 성능 특성 연구
Performance Characteristics Study on an Alternative Refrigerant in Low Temperature Applications 원문보기

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저온용 대체냉매의 성능 특성 연구 Performance Characteristics Study on an Alternative Refrigerant in Low Temperature Applications 원문보기

Abstract ▼ AI-Helper

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문제 정의

제안 방법

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참고문헌 (10)

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저온용 대체냉매의 성능 특성 연구
Performance Characteristics Study on an Alternative Refrigerant in Low Temperature Applications 원문보기

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