Abstract
This study demonstrated to evaluate potentials of CO2 emission reduction by implementation of ground source heat pump systems for heating use in a standard residence over the land of Japan. In each 10-km grid of different climate and geologic conditions, required borehole heat exchaneger length for the sustainable system in terms of soil and brain temperatures were determined by the annual operation simulation based on the three-dimensional geo-property database. The potential CO2 emission reduction of a residence and the total reduction in each grid were calculated, and were compared among 46 prefectures. As a result, the potential reduction of each residence was high in the cold regions and the mountaineous regions. On the other hand, the potential reduction in entire grid was high in the relatively warm areas, especially in the industrial and urbanized areas along the coarst of Pacific ocean, because the residence density was large. These results revealed the potentially high contributons of ground source heat pump systems for CO2 emission reduction, not only in cold regions where the sytstems have been developed in advance, but also in warm regions, i.e., in any prefecture of Japan.
