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鄭秀烈,金度完,韓喜煥,金宗植 啓明大學校 産業技術硏究所 1993 産業技術硏究所 論文報告集 Vol.16 No.2
Recently, in view of the shortage of the energy resources in our country and the present state in an increasing consumption of energy, there has been an increasing interest in developing thermal storage techniques of available heat sources. The thermal energy storage may be classified into the following methods ; the method using sensible heat and latent heat, and the method by means of reversible thermochemical reactions. Among them, the thermal storage by means of reversible thermochemical reactions is quite attractive because the heat storage capacity per unit mass or unit volume is usually much higher than those by means of sensible heat and latent heat, and in this thermal storage a longer term heat storage is possible without any thermal insulation when the reaction products are stored separately in different reservoirs after the reaction. In the present study, among many chemical reactions, the reversible reaction of Ca(OH)₂/CaO is employed as a promising candidate for the component reaction in the thermal energy storage system. As a step in the application of thermochemical reaction cycle of Ca(OH)₂ and CaO for chemical heat storage, the heat-storage characteristics of a packed bed of Ca(OH)₂ during endothermic dehydration were studied experimentally and numerically. As a result, it was found within the range of experimental conditions employed in the present study that the bed temperature remained almost at the reaction equilibrium temperature, which is determined by partial pressure of water vapor in the outlet gas. The numerical results obtained be solving fundamental differential equations derived with a few assumptions agreed fairly well with the experimental data, and fundamental heat-storage characteristics of Ca(OH)₂ packed bed were considered to be well explained by this numerical modeling.