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Selection and Comparative Studies of Working Fluids for Organic Rankine Cycle (ORC)


Selection and Comparative Studies of Working Fluids for Organic Rankine Cycle (ORC)
Authors : Vipin K, Anil Kumar B. C
Publication Date: 05-10-2015

Authors

Author(s):  Vipin K, Anil Kumar B. C

Published in:   International Journal of Engineering Research & Technology

License:  This work is licensed under a Creative Commons Attribution 4.0 International License.

Website: www.ijert.org

Volume/Issue:   Volume. 4 - Issue. 10 , October - 2015

e-ISSN:   2278-0181

 DOI:  http://dx.doi.org/10.17577/IJERTV4IS100093

Abstract

Energy conservation within the world is becoming more important in recent years particularly the use of low grade temperature and small scale heat sources. Organic cycle has the ability to deal with low heat source to generate power. The conventional Rankine cycle which uses water as the working fluid needs much higher temperature heat source while Organic Rankine cycle can generate power at much lower temperature heat source. However the water becomes uneconomical as working fluid. This is because high boiling point of water compared with organic fluid and also water is a wet fluid so in the T-S diagram the expansion lies inside the curve that indicate the droplet formation at the exit. So to avoid that we need to go for new fluid. So here we introduce a new methodology for selecting the appropriate fluid. In this paper numerical program is developed based on COOLPROP and find out the Thermal efficiency, Second law efficiency and Volumetric flow rate. of 30 fluids. The Temperature profile in the evaporator and condenser plays an important role in energy utilization. The condenser and evaporator pressure limits the use of some working fluids. According to results obtained from the analysis of Thermal efficiency, Second law efficiency, Volumetric flow rate in the case of sub critical cycle with varying evaporator temperature, the fluid R125 is selected as the suitable fluid with 3-6% efficiency while varying the temperature from 313-363K.then while considering the subcritical cycle with varying pressure The fluid R22 is more suitable with 7-10% efficiency while varying the pressure 10-20bar. Third cycle that is Trans critical cycle with varying pressure in that R134a is more suitable with 16-17% efficiency while varying the pressure 70-90 bar. To generalize the fluid which is applicable to all the cycle is R125 not much efficient but can be used in all the cycle that will be discussed in detail.

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