J4  2012, Vol. 46 Issue (12): 2237-2242    DOI: 10.3785/j.issn.1008-973X.2012.12.015
 土木工程

1.山东科技大学 土木建筑学院, 山东 青岛 266590；2.山东省土木工程防灾减灾重点实验室, 山东 青岛 266590；
3.青岛理工大学 环境与市政工程学院,山东 青岛 266033
Determination method for  rock-soil thermal properties
based on system optimization
ZHANG Chang-xing1,2, HU Song-tao 3, LIU Yu-feng1,2, CONG Xiao-chun1,2
1. College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, China；
2. Shandong Provincial Key Laboratory for Disaster Prevention and Reduction in Civil Engineering,Qingdao 266590, China；
3. School of Environmental and Municipal Engineering, Qingdao Technological University, Qingdao 266033, China
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Abstract:

For determining rock-soil thermal properties in the design of ground source heat pump system (GSHPs), this work presented a system model of rock-soil thermal response test (TRT) based on the duct storage system (DST) model of vertical U-pipes ground heat exchanger (GHE). As objective function，the temperature difference quadratic sum of the simulated average water temperature in the GHE from the system model and the testing value from the TRT was calculated. And a simulation-optimization approach was proposed for determining the optimal thermal conductivity and the heat capacity of rock-soil. A calculating sample based on TRT was conducted to validate the simulation-optimization approach. After the optimal result was applied in the system model of rock-soil TRT, three groups of simulated average water temperature based on different GHE models (finite line source model, cylinder source model, DST model) were compared with the test values. The result showed that the temperature difference quadratic sum corresponding to the DST model was minimum, and the maximum relative errors of heat transfer rate of GHE between the simulating values from the system model of rock-soil TRT and the test input values were lower than 3.11%.

 : TU 111