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Oil Circulation Ratio in CO2 Climate Control Systems
Technical Paper
2003-01-0730
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper presents the effect of the oil circulation ratio on the system performance of a CO2 climate control system and the effect of an oil separator on the oil circulation behavior using a new oil circulation ratio measurement method. In this study, the oil circulation ratio of a CO2/PAG mixture at various system conditions was measured. When the oil circulation ratio increases from 0.5 wt.% to 7 wt.%, the coefficient of performance decreases by 8% and 11% for idling and driving conditions, respectively. Without the oil separator, the oil circulation ratio increases more than 10 wt.%; with the oil separator, it was maintained at below detection level and 1.1 wt.% for idling and driving conditions, respectively.
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Authors
- Yunho Hwang - Center for Environmental Energy Engineering, University of Maryland
- Lorenzo Cremaschi - Center for Environmental Energy Engineering, University of Maryland
- Reinhard Radermacher - Center for Environmental Energy Engineering, University of Maryland
- Toshio Hirata - Denso Corp.
- Yukikatsu Ozaki - Nippon Soken Inc.
- Tadashi Hotta - Nippon Soken Inc.
Citation
Hwang, Y., Cremaschi, L., Radermacher, R., Hirata, T. et al., "Oil Circulation Ratio in CO2 Climate Control Systems," SAE Technical Paper 2003-01-0730, 2003, https://doi.org/10.4271/2003-01-0730.Also In
References
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