Journal
INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS, SOLARPACES 2014
Volume 69, Issue -, Pages 726-736Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.egypro.2015.03.083
Keywords
CSP; Dish Stirling; Phase change storage; Heat pipe; Concentrating Solar Power
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Dish-Stirling systems provide high-efficiency solar-only electrical generation and currently hold the world record at 31.25%. This high efficiency results in a system with a high possibility of meeting the DOE SunShot goal of S0.06/1(Wh. However, current dish-Stirling systems do not incorporate thermal storage. For the next generation of non-intermittent and cost-competitive solar power plants, we propose adding a thermal energy storage system that combines latent (phase-change) energy transport and latent energy storage in order to match the isothermal input requirements of Stirling engines while also maximizing the exergetic efficiency of the entire system. This paper reports current findings in the area of selection, synthesis and evaluation of a suitable high performance metallic phase change material (PCM) as well as potential interactions with containment alloy materials. The metallic PCM's, while more expensive than salts, have been identified as having substantial performance advantages primarily due to high thermal conductivity, leading to high exergetic efficiency,. Systems modeling has indicated, based on high dish Stirling system performance, an allowable cost of the PCM storage system that is substantially- higher than SunShot goals for storage cost on tower systems. Several PCM's are identified with suitable melting temperature, cost, and performance. (C) 2015 Published by Elsevier Ltd.
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