TY - GEN
T1 - A boundary element method for circulating thermal resistance of U-tube underground heat exchanger
AU - Liu, Yi
AU - Shi, Yang
AU - Zhang, Ya Ning
PY - 2014
Y1 - 2014
N2 - The boundary element method was introduced to calculate the thermal resistance between pipe outside surface and the borehole inner surface of vertical U-shaped pipe underground heat exchanger. The effects of U-tube diameter, borehole diameter and tube spacing on the thermal resistance were also discussed. The results showed that it took only 10 min to complete a simulation of an underground heat pump running continually for 1000 h, which took least 3 h to complete the same cycle through finite volume method. When the thermal conductivity λ of the backfill material was 1.8 W/m2·K, the thermal resistance of the U-shaped pipe decreased with the increase in the tube spacing, it decreased with the increase in the U-tube diameter, however, it increased when the borehole diameter increased.
AB - The boundary element method was introduced to calculate the thermal resistance between pipe outside surface and the borehole inner surface of vertical U-shaped pipe underground heat exchanger. The effects of U-tube diameter, borehole diameter and tube spacing on the thermal resistance were also discussed. The results showed that it took only 10 min to complete a simulation of an underground heat pump running continually for 1000 h, which took least 3 h to complete the same cycle through finite volume method. When the thermal conductivity λ of the backfill material was 1.8 W/m2·K, the thermal resistance of the U-shaped pipe decreased with the increase in the tube spacing, it decreased with the increase in the U-tube diameter, however, it increased when the borehole diameter increased.
KW - Boundary element method
KW - Soil source heat pump system
KW - Thermal resistance
KW - Underground heat exchanger
UR - https://www.scopus.com/pages/publications/84904052963
U2 - 10.4028/www.scientific.net/AMR.953-954.705
DO - 10.4028/www.scientific.net/AMR.953-954.705
M3 - 会议稿件
AN - SCOPUS:84904052963
SN - 9783038351344
T3 - Advanced Materials Research
SP - 705
EP - 709
BT - Advanced Energy Technology
PB - Trans Tech Publications Ltd
T2 - 3rd International Conference on Energy and Environmental Protection, ICEEP 2014
Y2 - 26 April 2014 through 28 April 2014
ER -