Simplified analysis of heat transfer for vertical multi-boreholes ground heat exchangers
YU Mingzhi, MA Tengteng, ZHANG Kai, HU Aijuan, CUI Ping, FANG Zhaohong
CIESC Journal . 2016, (5): 1844 -1851 .  DOI: 10.11949/j.issn.0438-1157.20150946