RT Journal T1 Analysis of factors affecting heat transfer of double U-shaped buried tubes based on TRNSYS A1 Tao LIU,Ye TIAN,Yongzhi MA PB Journal of Shandong University(Engineering Science) FD 2019-12-20 YR 2019 JF Journal of Shandong University(Engineering Science) JO Journal of Shandong University(Engineering Science) VO 49 IS 6 SP 113 DO 10.6040/j.issn.1672-3961.0.2019.317 K1 ;double U-shaped buried tube heat exchanger;number of holes;hole depth;hole spacing;outlet water temperature of buried tubes LK {http://gxbwk.njournal.sdu.edu.cn/EN/article/article_1885.shtml}