Simulation of CO2 Brayton cycle for engine exhaust heat recovery under various operating loads

Gequn Shu; Chengyu Zhang; Hua Tian; Yuanyuan Gao; Tuanbing Li; Ronggeng Qiu

doi:10.1007/s12209-015-2462-4

Transactions of Tianjin University ›› 2015, Vol. 21 ›› Issue (3) : 193 -198. DOI: 10.1007/s12209-015-2462-4

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Simulation of CO₂ Brayton cycle for engine exhaust heat recovery under various operating loads

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Abstract

A bottoming cycle system based on CO₂ Brayton cycle is proposed to recover the engine exhaust heat. Its performance is compared with the conventional air Brayton cycle under five typical engine conditions. The results show that CO₂ Brayton cycle proves to be superior to the air Brayton cycle in terms of the system net output power, thermal efficiency and recovery efficiency. In most cases, the recovery efficiency of CO₂ Brayton cycle can be higher than 9% and the system has a better performance at the engine’s high operating load. The thermal efficiency can be as large as 24.83% under 100% operating load, accordingly, the net output power of 14.86 kW is obtained.

Keywords

CO₂ / Brayton cycle / waste heat recovery

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Gequn Shu, Chengyu Zhang, Hua Tian, Yuanyuan Gao, Tuanbing Li, Ronggeng Qiu. Simulation of CO₂ Brayton cycle for engine exhaust heat recovery under various operating loads. Transactions of Tianjin University, 2015, 21(3): 193-198 DOI:10.1007/s12209-015-2462-4

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