ARTICLE:

• NUMERICAL STUDY OF HEAT TRANSFER OF A SINGLE U-TUBE IN VERTICAL GROUND-COUPLED HEAT PUMP SYSTEMS  download article

Dr. Chong-Fang Ma
College of Environmental & Energy Engineering, Beijing University of Technology Beijing 100082, China

Z. X. Gu
Beijing University of Technology, Beijing, China

Y. T. Wu
Beijing University of Technology, Beijing, China

ABSTRACT

The heat transfer rate of a single U-tube ground heat exchanger was studied numerically. First, a 3D 60-m full scale computational model of a working single U-tube ground heat exchanger was built and numerical simulation was performed. The simulation was validated by comparing numerically calculated results with experimental results. After that, two models are built to compute the heat extraction rate of a single U-tube of a heat pump operating in both cooling and heating mode, under both continuous and cyclic operation. The effects of borehole depth, inlet temperature and velocity of the heat transfer medium on the heat transfer rate were investigated, for both cooling and heating mode, continuous and cyclic operation.

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