液体空気利用エネルギー貯蔵システム : (コンクリート方式蓄冷槽の伝熱特性)

概要

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Thermal performance of a concrete cool storage unit for a liquid air energy storage system is evaluated. Since the cool storage unit is used in a wide temperature range, a large heat amount can be stored without using latent heat. A concrete composition is investigated for the concrete cool storage unit. This concrete has high durability for low-temperature transients by including air-entraining low-water agent and stainless steel fiber. The major problems for loss of concrete thermal performance are the decrease of concrete thermal conductivity due to crack formation and the decrease of gap conductance due to magnification of the air gap between concrete and heat transfer tube. The decrease of thermal conductivity of the high durability concrete is low, 0.6%/10 cycles which is about 1/7 of normal concrete. The gap conductance does not decrease significantly and its value is about 2.6 times that of normal concrete. Thermal performance of the concrete cool storage unit can be kept after low-temperature transients by using the high durability concrete.
2000-06-25