Experimental investigations on dynamic performance of organic Rankine cycle integrated with latent thermal energy storage under transient engine conditions

Zhi Li, Lei Wang, Ruicheng Jiang, Bingzheng Wang, Xiaonan Yu, Rui Huang and Xiaoli Yu

Energy, 2022, vol. 246, issue C

Abstract: To succeed on the aim of achieving a carbon-neutral energy system, improving the efficiency of waste heat recovery is an important technique route. However, most of available heat sources in energy-intensive industries and transport sectors always present fluctuating nature that prohibits the safe and efficient operation of organic Rankine cycle (ORC) based waste heat recovery systems. Hereby, this study proposes a novel ORC system integrated with latent thermal energy storage (LTES), using LTES to reduce the thermal power fluctuations of engine exhaust and improve the safety performance of downstream ORC system. A dual-model test bench including the traditional basic ORC and ORC-LTES directly driven by engine exhaust is designed and established. The dynamic performance of basic ORC and ORC-LTES is experimentally investigated and compared under different step-change and cyclic engine conditions. The experimental results indicate that the existing of LTES can significantly reduce the fluctuating range of exhaust temperature at the evaporator inlet under both step-change and cyclic engine conditions. Under step-change engine conditions, ORC-LTES can completely resist the sudden reduction of exhaust temperature and mass flowrate under small step-change ratio of engine load, and the superheat degree of ORC-LTES lasts much longer time to drop to zero than the basic ORC under larger step-change ratio of engine load, while superheat degree of the basic ORC fast drops to zero under different step-change engine conditions. Under cyclic engine condition, ORC-LTES keeps safely operating all the time while the basic ORC has to stop working in each period, in addition, the net power and thermal efficiency of ORC-LTES are 23.5% and 23.2% higher than that of the basic ORC respectively.

Keywords: Dynamic performance; Organic rankine cycle; Latent thermal energy storage; Fluctuating heat source; Waste heat recovery (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:246:y:2022:i:c:s0360544222003164

DOI: 10.1016/j.energy.2022.123413

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