液体空気利用エネルギー貯蔵システムにおける蓄冷槽のシミュレーション

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  • Simulation of Heat Transfer in the Cool Storage Unit of a Liquid Air Energy Storage System.
  • エキタイ クウキ リヨウ エネルギー チョゾウ システム ニ オケル チクレイソウ ノ シミュレーション

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An energy storage system that stores energy in the form of liquid air is studied. In this system, the cool storage unit is the most important unit. From the viewpoint of safety and economy, it is most promising to store cold as sensitive heat of solids such as pebbles or concrete. To grasp temperature variation of the solid cool storage unit, a simulator was developed that calculates unsteady heat transfer between supercritical gas flow and solid material. Comparison of the calculation result with an experimental result showed that the temperature variation of the metal cool storage medium was accurate within 11%. For the concrete cool storage unit, the calculation result showed that with less pitch of the tube, a smaller quantity of medium was required. The minimum quantity was 3 times that of concrete, simply estimated from heat capacity of concrete and air. The volume required for concrete cool storage was less than 1/100 of that of reservoirs for a pumped-hydro power station having a drop of 500m.

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