Comparison of CO2 and steam in transcritical Rankine cycles for concentrated solar power

Garg, P and Srinivasan, K and Dutta, P and Kumar, P (2014) Comparison of CO2 and steam in transcritical Rankine cycles for concentrated solar power. In: International Conference of the SolarPACES, SEP 17-20, 2013, Las Vegas, NE, pp. 1138-1146.

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Abstract

High temperature, high pressure transcritical condensing CO2 cycle (TC-CO2) is compared with transcritical steam (TC-steam) cycle. Performance indicators such as thermal efficiency, volumetric flow rates and entropy generation are used to analyze the power cycle wherein, irreversibilities in turbo-machinery and heat exchangers are taken into account. Although, both cycles yield comparable thermal efficiencies under identical operating conditions, TC-CO2 plant is significantly compact compared to a TC-steam plant. Large specific volume of steam is responsible for a bulky system. It is also found that the performance of a TC-CO2 cycle is less sensitive to source temperature variations, which is an important requirement of a solar thermal system. In addition, issues like wet expansion in turbine and vacuum in condenser are absent in case of a TC-CO2 cycle. External heat addition to working fluid is assumed to take place through a heat transfer fluid (HTF) which receives heat from a solar receiver. A TC-CO2 system receives heat though a single HTF loop, whereas, for TC-steam cycle two HTF loops in series are proposed to avoid high temperature differential between the steam and HTF. (C) 2013 P. Garg. Published by Elsevier Ltd.

Item Type:	Conference Proceedings
Series.:	Energy Procedia
Additional Information:	Copy right for this article belongs to the ELSEVIER SCIENCE BV, SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	10 Oct 2014 09:14
Last Modified:	16 Oct 2014 08:20
URI:	http://eprints.iisc.ac.in/id/eprint/49997

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