Experimental study on the applicability of ungrouted ground heat exchangers on thermal response tests

Hikari Fujii; Hiroyuki Kosukegawa; Hadi Farabi-Asl; Saeid Jalili Nasrabady

Experimental study on the applicability of ungrouted ground heat exchangers on thermal response tests

Hikari Fujii, Hiroyuki Kosukegawa, Hadi Farabi-Asl, Saeid Jalili Nasrabady

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Pages (from-to)	43-51
Number of pages	9
Journal	journal of the geothermal research society of japan
Volume	38
Issue number	2
Publication status	Published - 2016
Externally published	Yes

All Science Journal Classification (ASJC) codes

Geophysics

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title = "Experimental study on the applicability of ungrouted ground heat exchangers on thermal response tests",

abstract = "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.",

author = "Hikari Fujii and Hiroyuki Kosukegawa and Hadi Farabi-Asl and Nasrabady, {Saeid Jalili}",

year = "2016",

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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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