Using a 1D numerical temperature recovery model to estimate in-situ thermal diffusivity by an up-welling heat source in an artesian well

doi:10.1016/j.geothermics.2019.05.002

Chia Nan University of Pharmacy & Science Institutional Repository > 環境永續暨休閒學院 > 觀光事業管理系(含溫泉所) > 期刊論文 > Item 310902800/32654

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標題:	Using a 1D numerical temperature recovery model to estimate in-situ thermal diffusivity by an up-welling heat source in an artesian well
作者:	Chang, Cherng-Tzong Hsu, Nien-Sheng Wenfu Chen(陳文福)
貢獻者:	Water Resources Agcy Natl Taiwan Univ, Dept Civil Engn Chia Nan Univ & Sci, Inst Hot Spring Ind
關鍵字:	Temperature recovery In-situ thermal diffusivity Artesian
日期:	2019-09
上傳時間:	2020-07-29 13:53:53 (UTC+8)
出版者:	PERGAMON-ELSEVIER SCIENCE LTD
摘要:	The determination of thermal diffusivity is a pre-requisite for geothermal site characterization and utilization. The temperature recovery (TR) method is a popular method for determining in-situ thermal conductivity together with the thermal response test and thermal conductivity probe methods. To determine in-situ thermal properties of the subsurface following a thermal disturbance produced by drilling processes or a heating cable within a borehole, the TR method is used to record decaying temperatures during the recovery period. However, to date, no studies exist to determine thermal diffusivity using up-welling water within a well. In this study, we introduce a 1D numerical method for estimating in-situ thermal diffusivity of the subsurface using up-welling thermal water as a heat source within an artesian well. Our numerical model includes parameters for the position of a sensor within a borehole, as well as for the thermal properties of a well casing and an annulus. Two data sets from the scientific literature were used to verify our model. Field data from the Jiashi Hot Spring in Taiwan were also used to demonstrate model suitability. Our model's value for thermal conductivity is consistent with the range of values for saturated sand within the scientific literature. Accuracies for thermal diffusivity estimations under short disturbance/recovery period were also evaluated. The results suggest that in-situ thermal diffusivity can be accurate determined, with an error less than 10%, using a short testing period with pumping time as low as four hours and a recovery of 24 h.
關聯:	Geothermics, v.81, pp.143-151
顯示於類別:	[觀光事業管理系(含溫泉所)] 期刊論文

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