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Modified exergy analysis of a two-stage refrigeration system for a battery electric vehicle.

Number: 2138

Author(s) : VEGINI G. L. R., RIBEIRO G. B.

Summary

As a manner to decrease greenhouse emission, the used hybrid powertrain and battery electric vehicles (BEV) has increased considerably in the last years. Thus, an efficient thermal management system of BEV must take into account the battery heat removal and the mobile air-conditioning, making a direct cooling scheme that consists of two-stage refrigeration where one evaporator is addressed to the vehicle cabin, whereas the other is addressed to the battery pack. Focusing on these refrigeration systems, steady-state endoreversible modeling is proposed. The heat dissipated by the battery pack and the indoor and outdoor air conditions are applied as input conditions. Global thermal conductances are considered for all heat exchangers, considering different fluid phases. A scroll compressor with fixed volumetric and global efficiencies is modeled. The thermodynamic states throughout the cycle are achieved numerically by the means of successive substitutions. To evaluate the system performance, the modified exergy analysis (MEA) is implemented in this study. Employing this analysis, the amount of exergy destruction is split between the refrigerant and any system component. Furthermore, the refrigerant fluids R-1234ze, R-1234yf, and R-32 are applied and compared to the baseline fluid R-134a. This proper evaluation of the source of the exergy destruction will serve as a guide to enhance the performance of vapor compression systems commonly used BEV thermal management.

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  • Original title: Modified exergy analysis of a two-stage refrigeration system for a battery electric vehicle.
  • Record ID : 30030484
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022/07/10

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