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Field demonstration of a first thermal response test with a low power source.

Raymond, Jasmin; Lamarche, Louis; Malo, Michel (2015). Field demonstration of a first thermal response test with a low power source. Applied Energy , vol. 147 . p. 30-39. DOI: 10.1016/j.apenergy.2015.01.117.

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Résumé

Thermal response tests conducted to assess the subsurface thermal conductivity for the design of ground-coupled heat pump systems require a power source of about 7–12 kW to heat water circulating in a ground heat exchanger. This high power is commonly supplied with a fuel-fired generator, which is an important source of cost. An alternative method relying on a power source of less than 1 kW was consequently developed and used for a first field demonstration. Heat was injected along ten short sections of heating cable standing in the water column filling the pipe of the exchanger. Recovery temperatures measured at the middle height of each heating section were analyzed with a linear heat source solution of finite length. The ten local measurements distributed over a depth of 139 m and averaged according to the site stratigraphy revealed a subsurface thermal conductivity that is within an acceptable range of the bulk value determined with a conventional test. The new method has the potential to reduce the use of generators for thermal response tests since a low power source is common to construction sites.

Type de document: Article
Mots-clés libres: geothermal; heat pump; heat exchanger; thermal response test; heating cable; thermal conductivity
Centre: Centre Eau Terre Environnement
Date de dépôt: 23 avr. 2018 19:10
Dernière modification: 23 avr. 2018 19:10
URI: http://espace.inrs.ca/id/eprint/3922

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