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http://dx.doi.org/10.9726/kspse.2014.18.6.126

A Study on the Additives of mixed Gas charged in Thermostatic Bulb for Expansion Valve  

Kim, Si-Young (Dept. of Mechanical System Engineering, Pukyong National University)
Ju, Chang-Sik (Dept. of Chemical Engineering, Pukyong National University)
Koo, Su-Jin (Institute of Defense Science & Technology, Pukyong National University)
Publication Information
Journal of Power System Engineering / v.18, no.6, 2014 , pp. 126-132 More about this Journal
Abstract
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 $-15^{\circ}C{\sim}15^{\circ}C$. 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($N_2$ 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 $N_2$ 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.
Keywords
P-T diagram; Mixed Gas; R-134a; R-410A; R-22; Maximum operating pressure(MOP);
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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