Paper No 816 – nZEB with GWHP in cold region of Japan – 14th IEA Heat Pump Conference, Chicago, USA
The objective of this study is evaluation of the nZEB in a cold region in Japan equipped with an open-loop groundwater source heat pump (GWHP) system and radiant ceiling panel (RCP) system from both the energy conservation and the thermal environmental points of views. Firstly, the annual energy consumption was calculated based on the recorded measurements. The results indicated that this building could reach the ZEBready level in Japan. The primary energy consumption can be decreased by approximately 67% compared to that of the reference building by applying this system. Secondly, the indoor thermal comfort was evaluated based on the physical measurements and survey questionnaire. The results showed that the suspended RCP system could achieve comfortable indoor thermal conditions during the year. The indoor temperature was maintained within the range of 22–26 °C. Finally, energy conservation and the thermal comfort of the continuous operation methods for heating were compared to those of the intermittent operation method. Benefits of the continuous operation method were proved that a stable indoor thermal environment was maintained, and the COP and SCOP of the GWHP system were increased by 12%.