- 期刊
- OpenAccess
Numerical Analysis of a 3D PCM-embedded Evaporator with Serpentine Flow Channels for Low-grade Waste Heat Recovery from the Organic Rankine Cycle
摘要
The prediction of the consequences of the intermittent heat supply from the hot engine oil used in waste heat recovery (WHR) from the organic Rankine cycle (ORC) is of considerable interest in industry. In the present study, we propose a new WHR-ORC evaporator embedded with phase change material (PCM) and serpentine flow channels for the hot engine oil and cold supercritical carbon dioxide. This study focuses on the WHR-ORC situation, where the hot engine oil stops providing energy to carbon dioxide (the cold fluid, CO_2) as the inlet temperature decreases, albeit with the PCM continuing to supply additional heat to the CO_2 before the heated supercritical CO_2 enters the turbomachinery, with compensation for the loss of the energy supplied normally from the hot engine oil. A CFD tool is utilized to evaluate the performance of the PCM-embedded evaporator. Given a situation where the hot oil heat supply is not continued via a temperature drop from 195 °C to 45 °C, with the inclusion of PCMs, a reduction of 20.9, 24.9, and 26.4 % in the temperature drop of the CO_2 is achieved in the cases of an intermittent heat supply for the periods of downtime of 30, 45, and 60 seconds, respectively. Additionally, the overall dynamic response of heat transfer consistently and physically changes with variations in the hot oil inlet temperature.
延伸閱讀
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