Simulation and analysis of the supercritical orc heat exchanger

Yung Ming Li, Chi-Chuan Wang

研究成果: Conference contribution同行評審

摘要

The traditional organic Rankine cycle (ORC) is operatedbelow critical point. However, the specific heat of the workingfluid undergoes tremendous change near the critical point. Thiscan improve the thermal performance of the system due to theenhancement of heat transfer coefficient within the heatexchanger. However, the strong temperature dependence ofthermo-physical properties of the working fluid especially atnear the critical point requires much more efforts in designing aheat exchanger. Hence, more elaborate calculation involvingstepwise integration is needed as far as accuracy is concerned.Therefore the heat exchanger is divided into several segments.The outlet temperatures of the first segment serve as the inputparameters for the second segment, and the process is carriedout further on. The fluid properties are calculated with theactual bulk temperature of each segment. With increasingnumber of segments, better resolution of temperaturedistribution of both heat source and working fluid within theheat exchanger is achieved. In the present study, a plate heatexchanger was numerically examined by using R-245fa as aworking fluid at a supercritical condition. The effects of theworking pressure and mass flow rate were examined in detail.For all cases in this study, the maximum of the total heattransfer rate was achieved by a working pressure of 3700 kPa,especially close to critical pressure. It is found that at a workingpressure of 4000 kPa and mass flow rate ranging from 1 kg/s to1.75 kg/s, the total heat transfer rate was independent of themass flow rate.

原文English
主出版物標題Heat Exchanger Technologies; Plant Performance; Thermal Hydraulics and Computational Fluid Dynamics; Water Management for Power Systems; Student Competition
發行者American Society of Mechanical Engineers (ASME)
ISBN(電子)9780791851401
DOIs
出版狀態Published - 1 一月 2018
事件ASME 2018 Power Conference, POWER 2018, collocated with the ASME 2018 12th International Conference on Energy Sustainability and the ASME 2018 Nuclear Forum - Lake Buena Vista, United States
持續時間: 24 六月 201828 六月 2018

出版系列

名字American Society of Mechanical Engineers, Power Division (Publication) POWER
2

Conference

ConferenceASME 2018 Power Conference, POWER 2018, collocated with the ASME 2018 12th International Conference on Energy Sustainability and the ASME 2018 Nuclear Forum
國家United States
城市Lake Buena Vista
期間24/06/1828/06/18

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