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Enhancement of R-134a Automotive Air Conditioning System
Technical Paper
1999-01-0870
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The paper deals with potential augmentation of the present R134a automotive air conditioning system with the intent to lower its total equivalent warming impact (TEWI) which is a source of concern from the standpoint of environmental benignity of the system. It is identified that the most effective augmentation strategy includes (1) increase in compressor isentropic efficiency, (2) increase in condenser effectiveness, (3) decrease in lubricant circulation through the system, (4) decrease in air side pressure drop in evaporator through improved condensate management, (5) increase in condenser airflow, (6) decrease in air conditioning load via permissible increase in the amount of recirculated air through the passenger compartment and (7) reduction in direct emission of R-134a from the system through conservation and containment measures. The effect of each of these augmentations on the coefficient of performance (COP) of the system is quantified in a rigorous fashion. Extensive results are presented pertaining to performance of the present baseline R-134a system, realistically enhanced R-134a system and the idealized R-134a system that gives an upper bound on the maximum possible augmentation from a thermodynamic point of view. The paper also provides extensive comparisons of the TEWI of the R-134a system with those of the proposed alternate systems, viz., the flammable subcritical systems (R-152a, R-290 and R-717), supercritical carbon dioxide (R-744) system and conventional open air (R-729) cycle system. Based on these comparisons, it is concluded that the enhanced R-134a system is the most pragmatic solution to deal with the issue of the automotive air conditioning system TEWI.
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Authors
Citation
Bhatti, M., "Enhancement of R-134a Automotive Air Conditioning System," SAE Technical Paper 1999-01-0870, 1999, https://doi.org/10.4271/1999-01-0870.Also In
References
- Bhatti M. S. A Historical Look at Chlorofluorocarbon Refrigerants ASHRAE Paper No. CH-99-21-3 American Society of Heating, Refrigerating and Air Conditioning Engineers Annual Meeting Chicago, Illinois January 23-27 1999
- Bhatti M. S. History of Automotive Air Conditioning, Part 1: Comfort Heating ASHRAE Journal August 1999
- Bhatti M. S. History of Automotive Air Conditioning, Part 2: Comfort Cooling ASHRAE Journal September 1999
- Molina M. J. Rowland F. S. Startospheric Sink for Chlorofluorocarbons: Chlorine Atom-Catalyzed Destruction of Ozone Nature 249 810 812 June 1974
- Bhatti M. S. Global Warming Impact of Automotive Air Conditioning Systems Society of Automotive Engineers VII International Mobility Technology Conference and Exhibition Sao Paulo, Brazil November 9-11 1998
- U. S. Bureau of Census Statistical Abstracts of the United States: 1997 117th Washington, D.C. 1997
- Bhatti M. S. A Critical Look at R-744 and R-134a Mobile Air Conditioning Systems Paper No. 970527 Society of Automotive Engineers Int. Cong. & Expo. Detroit, Michigan February 24-27 1997
- Emission of Greenhouse Gases in the United States 1996 Report No. DOE/EIA-0573(96) Energy Information Administration, Office of Integrated Analysis and Forecasting, U. S. Department of Energy Washington, D.C. October 1997
- Yellen J. Chair White House Council of Economic Advisers Statement on the Economics of the Kyoto Protocol before the Committee on Agriculture, Nutrition and Forestry U. S. Senate Washington, D. C. March 5 1998
- Geller L. S. Elkins J. W. Lobert J. M. Clarke A. D. Hurst D. F. Butler J. H. Myers R. C. Tropospheric SF 6 : Observed Latitudinal Distribution and Trends, Derived Emissions and Interhemispheric Exchange Time Geophysical Research Letters 24 6 675 678 March 15 1997
- Houghton J. T. Meira Filho L. G. Callander B. A. Harris N. Kattenberg A. Maskell K. Climate Change 1995: The Science of Climate Change, Contribution of Working Group I to the Second Assessment Report of Intergovernmental Panel on Climate Change (IPCC) 572 Cambridge University Press U. K. New York, NY, USA 1996
- Kays W. M London A. L. Compact Heat Exchangers Third McGraw-Hill Book Company New York 1984
- Wallis G. B. One Dimensional Two-Phase Flow McGraw Hill Book Company New York 1969
- Wallis G. B. Critical Two-Phase Flow Int. J. Multiphase Flow 6 97 112 1980
- Kim Y. Two-Phase Flow of HCFC-22 and HFC-134a through Short Tube Orifices Texas A&M University May 1993
- Bhatti M. S. Shah R. K. Turbulent and Transition Flow Convective Heat Transfer in Ducts Chap. 4 in Handbook of Single-Phase Convective Heat Transfer 4 1 4 166 Kakac S. Shah R. K. Aung W. John Wiley & Sons New York 1987
- Blasius H. 131 Berlin 1913
- Watson K. M. Thermodynamics of the Liquid State - Generalized Prediction of Properties Ind. Eng. Chem. 35 4 398 406 1943
- Glasstone S. Text-Book of Physical Chemistry D. Van Nostrand Co., Inc. New York 446 1940
- Raoult F. M. II 1125 1127 1886
- Raoult F. M. II 353 373 1888
- Raoult F. M. XV 375 407 1888
- Raoult M. XX 297 371 1890
- Grebner J. J. Crawford R. R. The Effect of Oil on the Thermodynamic Properties of Dichlorofluoromethane (R-12) and Tetrafluoroethane (R134a) Report No. ACRC TR-13 Air Conditioning and Refrigeration Center, University of Illinois Urbana, Illinois October 1994
- Clapeyron E. Journal de L'ecole Polytechnique XIV XXIII 153 190 1834
- Reid R. C. Prausnitz J. M. Poling B E. The Properties of Gases and Liquids Fourth 222 225 McGraw-Hill Book Company New York 1987
- Trouton F. On Molecular Latent Heat The London, Edinburgh and Dublin Magazine and Journal of Science XVIII 54 57 July - December 1884
- Dittus P. W. Boelter L. M. K. Heat Transfer in Automobile Radiators of the Tubular Type Univ. Calif. Pub. Eng. 2 13 443 461 October 17 1930 Int. Comm. Heat Mass transfer 12 3 22 1985
- Taniguchi Y. Aoki H. Fujikake K. Tanaka H. Study on Car Air Conditioning System Controlled by Car Occupants' Skin Temperature Paper No. SAE- 920169 Society of Automotive Engineers Int. Cong. & Expo. Detroit, Michigan February 24-28 1992
- AMERIGON Inc. Product Catalog 404 East Huntington Drive, Monrovia, California 1994
- Feher S. Stirling Air Conditioned Variable Temperature (SVTS) & Comparison with Thermoelectric Air Conditioned Variable Temperature Seat Paper No. SAE- 980661 Society of Automotive Engineers Int. Cong. & Expo. Detroit, Michigan February 23-26 1998
- Moyer K. L. Analytical and Empirical Evaluation of the Impact of Solar Control Glazing on Thermal Environment in Vans Paper No. SAE- 950052 Society of Automotive Engineers Int. Cong. & Expo. Detroit, Michigan February 24-27 1995
- Fritsch R. Automotive Insulating Glass - Improvements in Comfort Paper No. SAE- 910546 Society of Automotive Engineers Int. Cong. & Expo. Detroit, Michigan February 25-28 1991
- Bhatti M. S. Kadle P. S. Baker J. A. Dehumidifying Mechanism for Auto Air Conditioning April 23 1996
- 1997 ASHRAE Handbook of Fundamentals American Society of Heating, Refrigerating and Air Conditioning Engineers Atlanta, Georgia 1997
- Farley D. L. HVAC Load Program Harrison Radiator Division General Motors Corporation Lockport, New York August 1983
- Jenssen J. F. Air Quality, Ventilation and Comfort ASHRAE Journal October 1999
- Wheeler A. E. A View of IAQ as the Century Closes ASHRAE Journal November 1999
- Bhatti M. S. Open Air Cycle Air Conditioning System for Motor Vehicles Paper No. 980289 Society of Automotive Engineers Int. Cong. & Expo. Detroit, Michigan February 23-26 1998
- Carrier W. H. Progress in Air Conditioning in the Last Quarter Century Trans. ASHVE 321 348 August 1936