Performance enhancement of high temperature latent heat thermal storage systems using heat pipes with and without fins for concentrating solar thermal power plants |
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| Affiliation: | 1. Barbara Hardy Institute, University of South Australia, Mawson Lakes Boulevard, Mawson Lakes, South Australia 5095, Australia;2. Department of Chemical and Material Engineering, Sebha University, Libya;1. Department of Mechanics, Mathematics and Management (DMMM), Polytechnic of Bari, Via Re David 200, 70126, Bari, Italy;2. Department of Agro-Environmental and Territorial Sciences (DISAAT), University of Bari, Via Amendola 165/A, 70126, Bari, Italy;3. Department of Civil Engineering and Architecture (DICAR), Polytechnic of Bari, Via Orabona, 70126, Bari, Italy;1. LEGI UMR 5519, BP 53, Grenoble Cedex 9, 38041, France;2. Hydroquest, Le Tarmac, 29 Chemin du Vieux Chêne, Meylan, 38240, France;3. LMFA UMR 5509, Ecole Centrale de Lyon, Ecully Cedex, 69134, France;1. IDMEC/LAETA, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal;2. Departamento de Física, Escola de Ciências e Tecnologia, Universidade de Évora, Évora, Portugal;3. Department of Electrical Engineering and Automation, Instituto Superior de Engenharia de Lisboa, Lisbon, Portugal;4. Centro Algoritmi, Universidade do Minho, Guimarães, Portugal |
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| Abstract: | A key drawback of using latent heat thermal storage systems for concentrating solar thermal power plants is the low thermal conductivity of the phase change material during the melting and solidification processes. This paper investigates an approach for reducing the thermal resistance by utilising axially finned heat pipes. A numerical model simulating the phase change material melting and solidification processes has been developed. This paper also includes the models of the evaporation and condensation of the heat pipe working fluid. The results show that by adding four axial fins and including the evaporation and condensation, the overall thermal performance of the storage system is enhanced significantly compared to having bare heat pipes. After 3 h a total of 106% increase in energy storage is obtained during the charging process. The results also show that the combined effect of incorporating the evaporation/condensation process and adding the fins leads to a threefold increase in the heat storage during the first 3 h. During the discharge process, there was a 79% increase in energy discharged and also the combined effect of incorporating the evaporation/condensation as well as adding the fins results in an almost four fold increase in the heat extracted within the first 3 h. A parametric analysis has also been carried out to analyse the effect of the finned heat pipe parameters after incorporating evaporation and condensation of the heat pipe working fluid. |
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| Keywords: | Thermal storage-high temperature Heat pipes Phase change material |
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