In recent years, R&D work has focused on radiant air-conditioning systems that use groundwater as a heat source/sink for realizing net zero-energy buildings (nZEBs). In a previous report, we described summer target figure for PMV of a ceiling radiation cooling system using groundwater including the power consumption of the electric fan and air-conditioner based on thermoregulatory behaviors. This paper presents the results of research about a cool spot installation in the radiation cooling/heating office. The effectiveness evaluation was carried out considering the number of time until thermal sensation is restored to a comfortable state after a subject’s going-out action.
