| 摘要 |
PROBLEM TO BE SOLVED: To easily restore an initial state of shielding a water surface, when a water level changes or a water flow is generated in heat storage water due to disturbances or the like. SOLUTION: A water surface shielding material 17 for shielding the water surface of the heat storage tank of a regenerative air conditioner comprises ball members 20 and collar members 21, each provided at a position spaced by a prescribed distance L from the center of each of the ball member. The specific gravity of the ball member 20 and the collar member 21 and the distance L from the center of the collar member 21 are adjusted, so that each collar member 21 is located above a water surface W.
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