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Parametric Analysis of Non-Adiabatic Transcritical Flow in Capillary Tubes for a New Refrigeration Cycle
Technical Paper
2005-01-2031
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper presents a non-adiabatic homogeneous model of carbon dioxide flow in a novel integrated accumulator-expander-heat exchanger, which integrates the functions of refrigerant storage, expansion and heat transfer, and can lower weight and cost of the system. The model is based on the fundamental conservation equations of mass, momentum and energy. These equations are solved simultaneously through iterations. The in-tube flow can be divided into a single-phase region and a two-phase region. The choking situation at the capillary outlet is evaluated by local sonic velocity judgment. Relationships between cooling pressure, evaporating temperature, capillary size, and other parameters are presented and analyzed in detail. It can be seen that the heat transfer changes with different kinds of capillary tubes under different conditions. The present model can be used for both system design and performance evaluation. It is also very helpful in understanding the transcritical flow behaviour inside capillary tubes.
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Citation
Chen, Y. and Gu, J., "Parametric Analysis of Non-Adiabatic Transcritical Flow in Capillary Tubes for a New Refrigeration Cycle," SAE Technical Paper 2005-01-2031, 2005, https://doi.org/10.4271/2005-01-2031.Also In
References
- Agrawal A. Eco-friendly refrigerants in the light of Montreal and Kyoto Protocols Purdue Compressor Engineering & Refrigeration and Air Conditioning Conference 2002
- Dickson T. R. Whittle W. Stobbart M. M. Internal heat exchanger accumulator 2002
- Zhang C. A. Mehraban H. Gibbons R. G. Jr. Urdea T. Accumulator with internal heat exchanger 2003
- Makizono K. Hirata T. Kuroda Y. Yamauchi Y. Accumulator module 2003
- Mei V. C. Chen F. C. Liquid over-feeding air conditioning system and method 1993
- Mei V. C. Chen F. C. Liquid over-feeding refrigeration system and method with integrated accumulator-expander-heat exchanger 1997
- Bansal P.K. Rupasinghe A. S. An empirical model for sizing capillary tubes International J. of Refrigeration 19 1996 497 505
- Bansal P.K. Rupasinghe A. S. A homogeneous model for adiabatic capillary tubes Applied Thermal Engineering 18 3-4 1998 207 219
- Bansal P.K. Xu B. A parametric study of refrigerant flow in non-adiabatic capillary tubes Applied Thermal Engineering 23 2003 397 408
- Bansal P.K. Wang G. Numerical analysis of choked refrigerant flow in adiabatic capillary tubes Applied Thermal Engineering 24 2004 851 863
- Zhang C. Ding G. Approximate analytic solutions of adiabatic capillary tube International J. of Refrigeration 27 2004 17 24
- Yoo S. H. Kim J. H. Hwang Y. W. Kim M. S. Min K. Kim Y. Heat transfer and pressure drop characteristics during the in-tube cooling process of carbon dioxide in the supercritical region International J. of Refrigeration 26 2003 857 864
- Choi J. Kim Y. Kim H. Y. A generalized correlation for refrigerant mass flow rate through adiabatic capillary tubes International J. of Refrigeration 26 2003 881 888
- Trisaksri V. Wongwises S. Correlations for sizing adiabatic capillary tubes International J. of Energy Research 27 2003 1145 1164
- Wongwises S. Suchatawut M. A simulation for predicting the refrigerant flow characteristics including metastable region in adiabatic capillary tubes International J. of Energy Research 27 2003 93 109
- Chen Y. Gu J. Non-adiabatic capillary tube flow of carbon dioxide in a novel refrigeration cycle Applied Thermal Engineering
- Fang X. Bullard C. W. Hrnjak P. S. Heat transfer and pressure drop of gas coolers ASHRAE Trans 107 2001 255 266
- Moody L. F. Friction factors for pipe flow Transaction of the ASME 1944 671 684
- Churchill S. W. Friction-factor equation spans all fluid-flow regimes Chemical Engineering 84 7 1977 91 92
- Collier J. G. Thome J. R. Convective boiling and condensation 3rd Oxford Science Publications 1996 274 279