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

Si-Young Kim, Chang-Sik Ju, Su-Jin Koo
2014 Journal of the Korea Society For Power System Engineering  
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).
more » ... 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.
doi:10.9726/kspse.2014.18.6.126 fatcat:vxt7l5iplzadfibdvo5adks7kq