Acknowledgement
Supported by : 아주대학교
Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)
- Volume 5 Issue 3
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- Pages.169-178
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- 1993
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- 1229-6422(pISSN)
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- 2465-7611(eISSN)
Investigation of the Performance of the Alternative Refrigerant HFC-134a through Capillary tube : Numerical Analysis
대체냉매 HFC-134a의 모세관 성능에 관한 수치해석적 연구
Abstract
Performance charts of capillary tubes for R-134a are presented. The calculation is based on the one-dimensional, adiabatic flow through capillary tube. The length of capillary tube changes with inlet pressure, mass flux, inlet quality(or subcooling), and inside diameter. The length for R-134a is shorter by 12.5~23% than that for R-12 as mass flux varies, by 13~18.5% as inlet pressure changes, by 15~15.2% as inside diameter changes, and by 3.6~20% as subcooling(or quality) changes. In general, the length for R-134a is shorter than that for R-12 by 10~20%. Pressure drop per unit length for R-134a is greater than that for R-12 since specific volume of R-134a is larger that of R-12 and vapor pressure of R-134a is greater than that of R-12. Flash point of R-134a is ahead of that of R-12.