Performance prediction of a sub-slab heat exchanger for geothermal heat pumps

被引:11
作者
Den Braven, K [1 ]
Nielson, E [1 ]
机构
[1] Univ Idaho, Dept Mech Engn, Moscow, ID 83844 USA
来源
JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME | 1998年 / 120卷 / 04期
关键词
D O I
10.1115/1.2888132
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
A large portion of the installation cost of a ground-coupled heat pump system is for the excavation necessary for ground coil placement. One possible method of reducing this cost is to place the ground coils beneath the slab floor of the building. This configuration of ground coil placement has not been specifically addressed in previous research. Freezing of the soil must be avoided in such a system. To simulate the temperature response of the surrounding soil to heat pump operation, a computer model was developed which incorporates line source theory in the form of a system of rings. The fluid temperature change along the length of the coil was used to determine the distribution of the ground load throughout the ring system. The model includes an adiabatic upper boundary, seasonal soil temperature variation, and thermal interference throughout the system. Using these results, the minimum soil temperature over a season was predicted Based on these results, design recommendations for ground coil installation are provided based on available area, soil type, heat extraction rate, depth of coil beneath the slab poor, and depth of slab floor below grade. These include recommendations for pipe spacing, flow direction, and a method to determine whether this type of system is feasible for installation in a particular location.
引用
收藏
页码:282 / 288
页数:7
相关论文
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