Abstract
This paper presents the performance measurement & evaluation for a thermal storage system to use a building slab and others in the classroom of a university building. Ice storage system is popular for use of heat pump system recently. But ice storage tank capacity is a little to use a heating water storage enough. Then this thermal storage system to use a building slab is developed conveniently for increases of heating storage capacity add to heating water storage system. The measurement result indicates the effect of the heating storage system to use a building slab.