팽창밸브 개폐용 감온통 혼합가스의 첨가제 연구 (A Study on the Additives of mixed Gas charged in Thermostatic Bulb for Expansion Valve)

서지정보

· 발행기관 : 한국동력기계공학회
· 수록지 정보 : 동력시스템공학회지 / 18권 / 6호 / 126 ~ 132페이지
· 저자명 : 김시영, 주창식, 구수진

초록

본 연구에서는 냉매 감온통 가스의 현재까지 단점을 보완하고자 R-410A를 기준물질로 정하고 여기에 R-134a를 소량씩 투입하여 R-134a/R-410A의 혼합비(3상혼합물, R-134a/R-32/R-125)를 변화시키면서 온도변화에 따른 압력변화를 측정하고 측정하고, 혼합냉매 특성치 분석 프로그램(Refrop v9.0, NIST)을 이용하여 열역학적 특성치를 분석 하였다. 또한 R-22 냉매와 온도-압력거동이 유사한 혼합냉매에 첨가제(N2, He gas)를 첨가하여 혼합냉매/첨가제의 혼합비를 변화시키면서 온도변화에 따른 최대조작압력(MOP, maximum operating pressure) 변화, 분석 및 검토 하였다

영어초록

The P-T characteristics of mixed refrigerant in thermostatic expansion valve sensing bulb were studied using R-134a and R-410A refrigerant. The characteristics of mixed refrigerant were investigated according to pressure variation and the variation of composition ratio of R-134A and R-410A in the temperature range of –15℃∼15℃. The Thermodynamic characteristic values ​​of the mixed refrigerants were identified using the characteristic value analysis program of mixed refrigerant(Refrop v9.0, NIST). The P-T characteristics in the case of the mixing ratio of 90:10 for R-410A and R-134A were the same result as R-22. And the physical properties showed similar results with R-22. The Maximum operating pressure(MOP) of mixed refrigerant showed a tendency to decrease with decreasing the mixing ratio of additive gases(N2 or He) gases. The characteristics in the case of the mixing ratio of 80:1 for mixed refrigerant and additive gases were the similar result as Reference refrigerant.(R-22 MOP, Sporlan company) In addition N2 and He, both showed the same results. It was able to confirm that a MOP on the thermostatic expansion valve sensing bulb can be maintained by adjusting the mixing ratio of mixed refrigerant gases and additive gases.

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