A New Correcting Algorithm for Thermal Response Test Data Evaluation
- 269 Downloads
Thermal Response Test (TRT) has become a very popular method of evaluating geothermal properties for ground-coupled heat pump systems. However, a test must be carried out under certain operating conditions of the project it serves, which is a strong restriction to its standardization. Few studies have previously focused on how to deal with TRT results in alternative conditions. Based on line source model, the influences of different factors on TRT results were analyzed, and a new algorithm for correcting TRT results was developed in this paper. The algorithm was applied to a case study, and the results calculated using the new algorithm show that thermal conductivity difference before and after comparison changed from −0.97 W/(m K) to 0.10 W/(m K) at different test conditions, and the relative error between the corrected values of ground thermal conductivity was reduced to 4.63%. Therefore, the new proposed correcting algorithm provides reference to the standardization of TRT and the generalization of test conditions, which can help save test time and cost caused by repeating tests.
KeywordsThermal response test Correcting algorithm Test duration Test conditions Heat transfer
The project is supported by National Key R&D Program of China (2017YFC0702900).
- 1.Gehlin, S.E.A., Nordell, B.: Thermal response tests of boreholes-results from in situ measurements. In: Geothermal Project at Richard Stockton College Conference. Luleå University of Technology, Luleå, Sweden (1998)Google Scholar
- 3.Kelvin, W.T.: Mathematical and Physical Papers. Cambridge University Press, London, UK (1882)Google Scholar
- 4.Ingersoll, L.R., Plass, H.J.: Theory of the ground pipe heat source for the heat pump. ASHVE Trans. 47(7), 339–348 (1948)Google Scholar
- 5.Morgensen, P.: Fluid to duct wall heat transfer in duct system heat storage. In: Proceedings of the International Conference on Surface Heat Storage in Theory and Practice, pp. 652–657. Stockholm, Sweden (1983)Google Scholar
- 6.Austin III, W.A.: Development of An In-Situ System for Measuring Ground Thermal Properties. Oklahoma State University, Oklahoma (1988)Google Scholar
- 7.Kavanaugh, S.P.: Simulation and Experimental Verification of Vertical Ground-Coupled Heat Pump Systems. Oklahoma State University, Oklahoma (1985)Google Scholar
- 8.Hellstrom, G.: Ground Heat Storage; Thermal Analysis of Duct Storage Systems. University of Lund, Lund (1991)Google Scholar
- 9.Incropera, F.P., DeWitt, D.P.: Fundamentals of Heat and Mass Transfer, 5th edn. Wiley, New York, USA (2002)Google Scholar
- 10.Wang, Q.: Simulation of Heat Transfer and Development of In-situ Testing Equipment of Rock and Soil Thermophysical Properties. Jilin University, Jilin (2009). (in Chinese)Google Scholar