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Title: Experimentation and cycle performance prediction of hybrid A/C system using automobile exhaust waste heat
Authors: Wang, Lei
Cai, Wenjian
Zhao, Hongxia
Lin, Chen
Yan, Jia
Keywords: Automobile air-conditioning system
Exhaust waste heat
Hybrid system
Compression ratio
Issue Date: 2016
Source: Wang, L., Cai, W., Zhao, H., Lin, C., & Yan, J. (2016). Experimentation and cycle performance prediction of hybrid A/C system using automobile exhaust waste heat. Applied Thermal Engineering, 94, 314-323.
Series/Report no.: Applied Thermal Engineering
Abstract: A hybrid air-conditioning (A/C) system is proposed which consists of two cycles: (1) an ejector cycle driven by exhausted waste heat; and (2) a compressor A/C cycle. The system can operate under three modes: compressor, hybrid and ejector. Under the hybrid mode, the ejector driven by waste heat reduces the compression ratio (CR) of the compressor and boosts the compressor discharge pressure to the condenser pressure. The governing equations are derived based on energy and mass balances for each component of the system. The performance of the hybrid A/C system under compressor mode and hybrid mode is first analyzed theoretically at design conditions. Then it was tested experimentally through variations of (1) primary pressure from 11 to 23 bar; (2) evaporation pressure from 2.5 to 4.5 bar; and (3) condensation pressure from 9 to 12.5 bar, respectively. The experimental results show that the hybrid system is feasible, and can significantly enhance the performance of the automobile A/C systems, 35.2% COP improvement at the automobile idle conditions and more than 40% COP improvement when the automobile speeds over 80 km/h conditions. The increase of primary pressure and evaporation pressure has a positive effect on system performance while the increase of condensation pressure has a negative effect. The hybrid A/C system has the potential to be adopted in automobiles for the advantages of low cost, durable operation and better energy efficiency
ISSN: 1359-4311
DOI: 10.1016/j.applthermaleng.2015.10.051
Schools: School of Electrical and Electronic Engineering 
Rights: © 2015 Elsevier Ltd. This is the author created version of a work that has been peer reviewed and accepted for publication by Applied Thermal Engineering, Elsevier Ltd. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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