Study of multi-cool/heat tubes buried under ground with narrow space between tubes part1. examination of the measurement result and system evaluation for a welfare inst.

摘要

When several cool/heat tubes are buried under ground with narrow pitch, the heat exchange ability dropped by influence of adjacent tubes. Though each tube needs sufficient distance for buried, tubes are buried with narrow space under ground on account of the restriction of the site and excavation costs. Therefore, this study aims at developing a obvious design technique for the system. In this paper, the efficiency of Multi- cool/heat tube was evaluated from the measurement result. Finally, numerical analysis was performed in order to investigate the performance of this system for long-term operation.