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Available online at www.sciencedirect.com ScienceDirect Energy Procedia 105 (2017) 1889 – 1894 The 8th International Conference on Applied Energy – ICAE2016 Thermodynamic Analysis of Organic Rankine Cycle with Hydrofluoroethers as Working Fluids Hanzhi Wanga,b,c, Huashan Lia,b, Lingbao Wanga,b, Xianbiao Bua,b,* a Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China bGuangdong Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China c University of Chinese Academy of Sciences, Beijing 100049, China Abstract This paper presents an analysis of organic Rankine cycle (ORC) using hydrofluoroethers including HFE7000, HFE7100 and HFE7500 as working fluids under constant external conditions. A computer program has been developed to parametrically compare the first and second law efficiencies, power output, turbine size factor with increase in turbine entry temperature. The results show that HFE7000 produces the maximum thermodynamic efficiencies and performs better in view of the net power output under the given working conditions. Moreover, HFE7000 has the lowest turbine size factor comparing with HFE7100 and HFE7500. Therefore, HFE7000 can be recommended to be used as working fluid in ORC to convert low-grade heat into power. Keywords: Low-grade thermal energy; Organic Rankine cycle; Hydrofluoroether; Thermodynamic analysis 1. Introduction In recent years, energy and environmental problems are becoming increasingly prominent. As a well accepted technology, the organic Rankine cycle (ORC) has attracted a lot of attention since it can make good use of low-grade thermal energy sources, such as solar thermal, geothermal and waste heat in industry [1]. A proper working fluid is critical in the ORC applications, and various researchers dedicated to this subject [2-7]. The working fluids used in the ORC processes mainly involve the chlorofluorocarbons (CFCs, e.g. R113), hydrochlorofluorocarbons (HCFCs, e.g. R123), hydrofluorocarbons (HFCs, e.g. R245fa) or hydrocarbons (HCs, e.g. R600). However, both the CFCs and HCFCs possess ozone depletion potential (ODP), while the HFCs have relatively significant global warming potential (GWP); as the * Corresponding author. Tel.: +86 20 87057792; fax: +86 20 87057791. E-mail address: buxb@ms.giec.ac.cn 1876-6102 © 2017 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of the scientific committee of the 8th International Conference on Applied Energy. doi:10.1016/j.egypro.2017.03.554 © 201176TTheheAuAthuothrso.rPsu.bPliusbhelidshbyedEblsyevEielrseLvtdie. rThLitsdi.s an open access article under the CC BY-NC-ND license S(hettlpe:c//tciorenataivnedc/omr mpeoenrs-.orergv/ileicwenusensd/beyr-rnecs-pndo/n4s.0ib/)i.lity of ICAE Peer-review under responsibility of the scientific committee of the 8th International Conference on Applied Energy.PDF Image | Thermodynamic Analysis ORC Hydrofluoroethers working fluid
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