Transcritical dual-loop Rankine cycle waste heat recovery system for China VI emission standards natural gas engine

Chenfang Wang, Shihao Liu, Shuming Zhan, Mengmeng Ou, Jiangjun Wei, Xiaozhang Cheng, Weilin Zhuge and Yangjun Zhang

Energy, 2024, vol. 292, issue C

Abstract: This paper presents the design of a waste heat recovery system for a China VI emission standards (China VI) natural gas engine to address cooling challenges. A heat balance bench experiment was conducted to characterize the waste heat properties of the engine's exhaust, exhaust gas recirculation exhaust (EGR), and coolant. A transcritical dual-loop Rankine cycle system was modeled and analyzed using MATLAB to recover this waste heat. The system utilizes two loops: high-temperature loop to recover exhaust waste heat and EGR waste heat and low-temperature loop to recover waste heat from the coolant and high-temperature loop, improving overall recovery. The low-temperature loop is based on a transcritical cycle, making the system more compact than a subcritical alternative and better suited for vehicle applications. Analysis identified water as the working fluid for high-temperature loop and R32 as the optimal working fluid for low-temperature loop. The Rankine cycle waste heat recovery system was found to increase the engine's power output by approximately 71.29 kW at rated operating conditions, representing a 21.03% gain over the original power.

Keywords: Dual-loop Rankine cycle; Waste heat recovery; Natural gas engine; Waste heat characteristics (search for similar items in EconPapers)
Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:292:y:2024:i:c:s0360544224003499

DOI: 10.1016/j.energy.2024.130577

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