Simulation of the Periodical Heat Transfer Performance of Vertical Ground Heat Ezchanger
Ground source heat pump (GSHP) systems usually operate in discontinuous mode to meet users demand and climate condition, whether for residential or official buildings. As a key component in GSHP systems, vertical ground heat exchanger(VGHE) operate in discontinuous mode too. So that, most of analytical and numerical models are difficult to have an accurate description to VGHEs heat transfer procedure. In this paper, the discontinuous mode is summarized as periodical mode in an 1-day cycle, a full-scale 3D numerical model of a single u-tube VGHE is set up, solved by FLUENT and compared with an analytical result. It is shown that, when VGHE operating in periodical mode, the soil effected radius will be smaller, the VGHEs heat supply ability will be better, compared with continuous mode. About fluid velocity in VGHE, there are an optimized range related to temperature difference, heat flux and pumps energy consumption. Besides, the running proportion is another important factor to heat transfer procedure, the less the running proportion is, the better the VGHEs heat transfer ability will be.
Ground source heat pump Vertical ground heat ezchanger Periodic operation mode Numerical simulation
Xinnan Song Zhipeng Zhang Lihong Liu
School of Energy and Power Engineering,Jiangsu University,Zhenjiang,China
国际会议
The 6th International Symposium on Heating,Ventilating and Air Conditioning(第六届国际暖通空调学术会议)
南京
英文
1949-1956
2009-11-06（万方平台首次上网日期，不代表论文的发表时间）