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Improving parameter estimates obtained from thermal response tests: Effect of ambient air temperature variations

descriptionPublicationkeyboard_double_arrow_right Article , Journal 01 Jun 2011Publisher:Elsevier BVJournal:Geothermics, volume 40, pages 136-143 (issn: 0375-6505,

Authors: Álvaro Montero; Javier F. Urchueguía; P. Fernández de Córdoba; Tatyana V. Bandos;

doi: 10.1016/j.geothermics.2011.02.003

Improving parameter estimates obtained from thermal response tests: Effect of ambient air temperature variations

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Abstract

[EN] This paper presents a method of subtracting the effect of atmospheric conditions from thermal response test (TRT) estimates by using data on the ambient air temperature. The method assesses effective ground thermal conductivity within 10% of the mean value from the test, depending on the time interval chosen for the analysis, whereas the estimated value can vary by a third if energy losses outside the borehole are neglected. Evaluating the same test data using the finite line-source (FLS) model gives lower values for the ground thermal conductivity than for the infinite line-source (ILS) model, whether or not heat dissipation to ambient air is assumed. This paper has been supported by the European Union Commission under projects GROUND-MED FP7-ENERGY-2007-2-TREN-218895, 043340, and Geotrainet - IEE/07/581; the Spanish Ministry of Education and Science under projects "Modelado y simulacion de sistemas energeticos complejos" (Programa Ramon y Cajal 2005) and ENE2008-00599/CON; by the Government of Valencia under project GV/2008/292; and by PAID-06-09/2734.

Related Organizations

Universitat Politècnica de València
Spain

Keywords

Ambient air temperature, Ground-source heat pump, Mean values, Heat exchangers, Ground thermal conductivity, Testing, Parameterization, Air temperature, Atmospheric temperature, Heat transfer, Borehole heat exchangers, Finite line-source method, Parameter estimation, Geothermal system, Heat dissipation, Thermal response test, Test data, Energy dissipation, Ambient air, Time interval, Ground-source heat pumps, Geothermal heat pumps, Energy loss, Borehole, Thermal conductivity, FISICA APLICADA, MAQUINAS Y MOTORES TERMICOS, Atmospheric conditions, Parameter estimate, Estimation method, MATEMATICA APLICADA

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