Thermal response test and numerical analysis based on two models for ground-source heat pump system

Abstract Thermal response test (TRT) is becoming increasingly popular in obtaining the ground thermal properties as well as evaluating the performance of the ground heat exchanger (GHE) that determines the properties of ground source heat pump (GSHP) system. This study investigated a practical engineering project, which is located in Shijiazhuang, Hebei Province, as an example to test the ground thermal properties. A popular constant heating-flux method (CHFX) was used with the heat load of 3.6 kW and 8.4 kW, respectively. This investigation compared and analyzed the ground thermal properties by the line source model (LSM) and the cylinder source model (CSM). This study also conducted the sensitivity analysis on different data intervals by fixing starting time or ending time. Moreover, a new method (Bland–Altman analysis) was proposed to analyze and determine the agreement between simulated and experimental data. The results showed that the new method performed well in evaluating the agreement and could help to properly choose the test duration and data interval for thermal response test.

[1]  J. E. Bose,et al.  Design/data manual for closed-loop ground-coupled heat pump systems , 1985 .

[2]  J. C. Jaeger,et al.  Conduction of Heat in Solids , 1952 .

[3]  Hongxing Yang,et al.  Heat transfer analysis of ground heat exchangers with inclined boreholes , 2006 .

[4]  Licentiate Thesis,et al.  Thermal Response Test - In Situ Measurements of Thermal Properties in Hard Rock , 1998 .

[5]  Mustafa Inalli,et al.  In-situ thermal response test for ground source heat pump system in Elazığ, Turkey , 2009 .

[6]  G. Hellström,et al.  Comparison of four models for thermal response test evaluation , 2003 .

[7]  D. Altman,et al.  Measuring agreement in method comparison studies , 1999, Statistical methods in medical research.

[8]  Maoyu Zheng,et al.  Development of a numerical model for the simulation of vertical U-tube ground heat exchangers , 2009 .

[9]  Mustafa Inalli,et al.  Modeling a ground-coupled heat pump system by a support vector machine , 2008 .

[10]  S. Gehlin.  Thermal response test : in situ measurements of thermal properties in hard rock , 1998 .

[11]  Louis Lamarche,et al.  A new contribution to the finite line-source model for geothermal boreholes , 2007 .

[12]  J. Claesson,et al.  SIMULATION MODEL FOR THERMALLY INTERACTING HEAT EXTRACTION BOREHOLES , 1988 .

[13]  L. Gosselin,et al.  Numerical analysis of thermal response tests with a groundwater flow and heat transfer model , 2011 .

[14]  Mehmet Esen,et al.  Forecasting of a ground-coupled heat pump performance using neural networks with statistical data weighting pre-processing , 2008 .

[15]  W. Press,et al.  Numerical Recipes: The Art of Scientific Computing , 1987 .

[16]  Daniel Pahud,et al.  Numerical evaluation of thermal response tests , 2007 .

[17]  Mustafa Inalli,et al.  Predicting performance of a ground-source heat pump system using fuzzy weighted pre-processing-based ANFIS , 2008 .

[18]  Chengying Qi,et al.  Improved method and case study of thermal response test for borehole heat exchangers of ground source heat pump system , 2010 .

[19]  Burkhard Sanner,et al.  Thermal Response Test - Current Status and World-Wide Application , 2005 .

[20]  Stephen P. Kavanaugh,et al.  Ground Source Heat Pumps : Design of Geothermal Systems for Commercial and Institutional Buildings , 1997 .

[21]  Ryozo Ooka,et al.  Development of a numerical model to predict heat exchange rates for a ground-source heat pump system , 2008 .

[22]  J. D. Deerman.  Simulation of Vertical U-tube Ground-coupled Heat Pump Systems using the Cylindrical Heat Source Solution , 1991 .

[23]  J M Bland,et al.  Statistical methods for assessing agreement between two methods of clinical measurement , 1986 .

[24]  Clive Baldock,et al.  The Bland-Altman analysis: Does it have a role in assessing radiation dosimeter performance relative to an established standard? , 2010 .