TY - JOUR
T1 - Experimental study on the applicability of ungrouted ground heat exchangers on thermal response tests
AU - Fujii, Hikari
AU - Kosukegawa, Hiroyuki
AU - Farabi-Asl, Hadi
AU - Nasrabady, Saeid Jalili
PY - 2016
Y1 - 2016
N2 - The applicability of ungrouted ground heat exchangers (GHEs) in thermal response tests (TRTs) has not been confirmed since TRTs are generally carried out in grouted GHEs. In this work, two TRTs were carried out in a 102 m GHE of 100 mm casing ID under ungrouted and grouted conditions. The TRT results were interpreted through the conventional graphical method and more advanced approach using the cylindrical source function and optical fiber thermometers. The interpretation results of thermal conductivity in the ungrouted and grouted GHE showed reasonably good matching in both interpretation methods, indicating the applicability of the TRTs to ungrouted GHEs for the optimum design and the development of potential maps of ground source heat pump systems.
AB - The applicability of ungrouted ground heat exchangers (GHEs) in thermal response tests (TRTs) has not been confirmed since TRTs are generally carried out in grouted GHEs. In this work, two TRTs were carried out in a 102 m GHE of 100 mm casing ID under ungrouted and grouted conditions. The TRT results were interpreted through the conventional graphical method and more advanced approach using the cylindrical source function and optical fiber thermometers. The interpretation results of thermal conductivity in the ungrouted and grouted GHE showed reasonably good matching in both interpretation methods, indicating the applicability of the TRTs to ungrouted GHEs for the optimum design and the development of potential maps of ground source heat pump systems.
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M3 - Article
AN - SCOPUS:84995595631
VL - 38
SP - 43
EP - 51
JO - Journal of the Geothermal Research Society of Japan
JF - Journal of the Geothermal Research Society of Japan
SN - 0388-6735
IS - 2
ER -