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DOI : , Vol.19, No.6, 41 ~ 48, 2011
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| Title |
| Heat Absorption and Release of Phase Change Materials with Thermal Energy Storage for Heat Recovery from Anaerobic Digester of Sewage Treatment Plant |
| 김광수 Kwang Soo Kim , 전태환 Tae Hwan Jun , 박정오 Jung O Park , 김이태 I Tai Kim |
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| Abstract |
| The use of latent heat storage system using phase change materials(PCMs) is an effective way of storing thermal energy and has the advantage of high-energy storage density. To know the thermal properties of PCMs around room temperatues this study was investigaed on polyethylene glycol(PEG), fatty acids and hydrated salts as PCMs for for heat recovery from anaerobic digester of Sewage Treatment Plant. The experiments were carried out with bench scale device which consisted of cylinder glass tubes of 20ml, no insulation of their bottom parts for heat transfer, putting insulation round the their rest parts. To study heat absorption at hot conditions, the tubes contained PCMs were kept on the temperature of 10℃ and then moved to the temperature of 50℃. To study heat release at cooling conditions, the tubes contained PCMs were kept on 50℃ and then moved to the temperature of 10℃. The experimental results of heat absorption and release of PCMs are as follows. In case of PEG the more molecular weight is high, the more the heat storage in hot conditions and heat release in cooling conditions showed clearly. In fatty acids, performing with the caprilic acid and glycerine matters, the caprilic acid was observed heat storage and release very perfectly but the glycerine did not. In hydrated inorganic salts, the Glauber`s salt(Na2SO4·10H2O) and Zn(NO3)·6H2O, with high hydrate molecular weight were very attractive for thermal storage and release but CH3COONa·3H2O with low hydrate molecular weight did not show the thermal properties of heat storage and release. |
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| Key Words |
| Phase change materials, Heat absorption, Heat release, Latent heat, heat recovery |
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