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http://dx.doi.org/10.9726/kspse.2014.18.1.069

A Study on the Dynamic Characteristics of Nitrogen Mixed Gas for Thermostatic Expansion Valve Sensing Blub  

Kim, Si-Young (Dept. of Mechanical System Engineering, Pukyong National University)
Koo, Su-Jin (Institute of Defense Science & Technology, Pukyong National University)
Ju, Chang-Sik (Dept. of Chemical Engineering, Pukyong National University)
Publication Information
Journal of Power System Engineering / v.18, no.1, 2014 , pp. 69-75 More about this Journal
Abstract
The pressure and temperature characteristics of mixed refrigerant gases in bulb for thermostatic expansion valve were studied using R22 refrigerant and $N_2$ gases. The characteristics of mixed refrigerant gases were investigated according to pressure variation and the variation of composition ratio of R22 refrigerant and $N_2$ gases in the temperature range of -$15^{\circ}C$~$15^{\circ}C$. The Maximum operating pressure(MOP) of mixed refrigerant gases were showed a tendency to decrease with decreasing the mixing ratio of $N_2$ gas. The characteristics in the case of the mixing ratio of 90:1 for R22 refrigerant and $N_2$ gases were the same result as Reference refrigerant. In addition, the characteristics of the mixed refrigerant gases in the mixing ratio of 90:1 for R22 refrigerant and $N_2$ gases were showed almost linear in the measurement range of pressure-temperature, and the physical properties also were showed similar results with Reference refrigerant. It was able to confirm that a MOP on the thermostatic expansion valve for sensing bulb can be maintained by adjusting the mixing ratio of R22 refrigerant and $N_2$ gases.
Keywords
Thermostatic Expansion Valve(TXV); Maximum Operating Pressure(MOP); P-T diagram; R22 refrigerant; $N_2$ gas;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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1 C. Y. Park, 2009, "Electronic Expansion Valves VS. Thermal Expansion Valves", SAREK Journal, Vol. 38, No. 8, pp. 65-71.
2 S. P. Won, 2011, "Modelling of an Automotove Block Type Thermostatic Expansion Valve", SAREK Journal, Vol. 23, No. 4, pp. 251-258.
3 www.kvc.com, 1999, "Data sheet danfoss termo statiske ekspansjonsventiler".
4 D. Andrew et. al., 1968, "Modern Refrigeration and Air Conditioning", Goodheart Willcox. p. 343.
5 James M. Calm, 2008, "Properties and Efficiencies of R-410A, R-421A, R-422B and R-422D compared to R-22" JMC/RMS-0807a, pp. 1-10.
6 H. S. Chang, 2007, "Condensation Heat Transfer Characteristics of R-410A as an Alternative R-22 in the Condenser with Small Diameter Tubes", Clean Technology, Vol. 13, No. 2, pp. 151-158.
7 J. D. Kim, J. S. Lim and B. G. Lee, 2002, "CFC Alternative Refrigerants", Journal of the Korean Industrial and Engineering Chemistry, Vol. 13, No. 6, pp. 491-501.   과학기술학회마을
8 D. S. Jung and Y. J. Song, 2000, "Performance of Alternative Refrigerant Mixtures for HCFC22, Int J Refrigeration. Vol. 23, No. 6, pp. 466-474.   DOI   ScienceOn
9 Domanski, P. A and Didion, D. A., 1993, "Thermodynamic evaluation of R22 alternative refrigerants and refrigerant mixtures", ASHRAE Trans. Vol. 99, Part2, pp. 636-648.
10 W. Keith snelson. and J . W. linton, 1995, System Drop- in Tests Refrigerant Blend R- 125/R143a/ R134a (44%52%4%) Compared to R-502, ASHRAE Trans, Vol. 101, pp. 17-24.
11 D. Andrew et. al., 1968, "Modern Refrigeration and Air Conditioning", Goodheart Willcox. pp. 170-178.
12 W. David et. al., 1992, "Chemistry Science of Change", Winston Inc., p. 419.
13 www.spolan.com, 2000, "Refrigerant Pressure Temperature Table"
14 J. I. Yoon, 2013, " Effects on Heat Exchangers Efficiency on Performance of Cryogenic Refrigeration Cycles," Journal of the Korean Society for Power System Engineering, Vol. 17, No. 4, pp. 58-63.