Thermal recovery test for determining the thermal conductivity of the soil

Author:

Vasilev Marija1ORCID,Banjac Milos1ORCID

Affiliation:

1. Department of Thermomechanics, Faculty of Mechanical Engineering, University of Belgrade, Belgrade, Serbia

Abstract

This paper presents a new in-situ experimental procedure for determining a thermal conductivity of soil, as one of the thermophysical properties necessary for dimensioning vertical buried heat exchangers of geothermal heat pumps. The proposed method, called the Thermal Recovery Test, is based on the assumption that there is a direct analogy between the hydrodynamic process of filling (recovery) the well with water from a porous aquifer after its partial or complete discharging and the process of establishment of thermal equilibrium in an infinite medium previously disturbed by a line heat sink (source). Apart from presentation the theoretical background of these two phenomena, the display of the identical theoretical logarithmic character of the change of hydrostatic pressure and soil temperature, description of the experimental procedure, the experimental results of three performed experiments are also presented. Additionally, results for the experimentally obtained values of the thermal conductivity of the soil are compared with those obtained from the Thermal Response Test, and the advantages and drawbacks of the new Thermal Recovery Test method are analyzed.

Funder

Ministry of Education, Science and Technological Development of the Republic of Serbia

Publisher

National Library of Serbia

Subject

Renewable Energy, Sustainability and the Environment

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