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The Role of Suction Line Heat Exchanger in Transcritical R744 Mobile A/C Systems
Technical Paper
1999-01-0583
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Transcritical R744 systems are under consideration for use in mobile air conditioning. Experimental results indicate that the inherent thermodynamic shortcomings of R744 could be overcome by exploiting inherent advantages in transport properties, pressure drop, and other characteristics. This paper describes one possible way to improve both capacity and energy efficiency of the R744 system for the car air conditioning. It considers the use of a suction line heat exchanger. Four different configurations of the prototype system were tested: without heat exchanger, and with three coaxial heat exchangers having lengths 1.0, 1.5 and 2.0m. All heat exchangers were made from identical pipes.
Results show that both the capacity and the coefficient of performance could be increased by up to 25%. Greater influence is registered at the higher temperatures of the air to the gas cooler.
The results also demonstrate the extent to which suction line heat exchangers can increase compressor discharge temperatures, thereby complicating the task of compressor design and introducing reliability risks.
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Authors
- D. Boewe - Air Conditioning and Refrigeration Center (ACRC), University of Illinois
- J. Yin - Air Conditioning and Refrigeration Center (ACRC), University of Illinois
- Y. C. Park - Air Conditioning and Refrigeration Center (ACRC), University of Illinois
- C. W. Bullard - Air Conditioning and Refrigeration Center (ACRC), University of Illinois
- P. S. Hrnjak - Air Conditioning and Refrigeration Center (ACRC), University of Illinois
Citation
Boewe, D., Yin, J., Park, Y., Bullard, C. et al., "The Role of Suction Line Heat Exchanger in Transcritical R744 Mobile A/C Systems," SAE Technical Paper 1999-01-0583, 1999, https://doi.org/10.4271/1999-01-0583.Also In
References
- Lorentzen, G. Pettersen, J. 1993 A New, Efficient and Environmentally Benign System for Car Air-Conditioning International Journal of Refrigeration 16 1 4 12
- Yin J. Park Y. C. Boewe D. McEnaney R. Beaver A. Bullard C. W. Hrnjak P. S. 1998 Experimental and model comparison of transcritical CO 2 versus R134a and R410 system performance Natural Working Fluids '98, IIR - Gustav Lorentzen conference Oslo 331 340
- McEnaney R.P. Boewe D.E. Yin J. M. Park Y. C. Bullard C. W. Hrnjak P.S. 1998 Experimental Comparison of Mobile A/C Systems when Operated With Transcritical CO 2 Versus Conventional R134a 1998 International Refrigeration Conference at Purdue 145 150
- Park Y. C. McEnaney R. Boewe D. Yin J. M. Hrnjak P. S. 1999 Steady State And Cycling Performance Of A Typical R134a Mobile A/C System SAE International Congress and Exposition, Paper 99PC-4
- McEnaney R. Park Y. C. Yin J. Bullard C. W. Hrnjak P. S. 1999 Performance Of The Prototype Of A Transcritical R744 Mobile A/C System SAE International Congress and Exposition, Paper 99PC-6