PMV control system was applied for a ceiling radiation cooling/heating system utilizing groundwater as heat source/sink. System improvements including extension of the ceiling radiation panel and inverter control of pumps were carried out in the 2012. The research results in summertime cases are summarized below:
1) Indoor PMV values were settled in the range of 0.2-0.6 which was narrower than the previous year. 2) The power consumption of the pumps dropped to 1/3 of the previous year, and that of the whole system containing an makeup air unit dropped to 2/3.
