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Multi-injection rate thermal response test with forced convection in a groundwater-filled borehole in hard rock

H. T. Liebel ; Saqib Javed (Institutionen för energi och miljö, Installationsteknik) ; G. Vistnes
Renewable Energy (0960-1481). Vol. 48 (2012), p. 263-268.
[Artikel, refereegranskad vetenskaplig]

Convection is shown in earlier studies to improve the thermal contact between heat exchanger and borehole wall in water-filled boreholes. This study investigates the effect of convection on the required borehole length for a ground-coupled heat pump installation. Artificial convection was induced by an ordinary groundwater pump during a multi-injection rate thermal response test (MIR-TRT). For comparison, a second MIR-TRT was performed without pumping of groundwater. The required borehole length was estimated for a ground-coupled heat pump installation supplying a Swedish single-family house. The estimates are based on the results from the MIR-TRTs for thermal conductivity and borehole resistance. The results show linear decrease in required borehole length with increasing heat input rate during the MIR-TRT without pumping of groundwater due to buoyancy-driven convection. An artificial convection stronger than buoyancy-driven convection during the MIR-TRT with pumping of groundwater reduced the required borehole length by 9 %-25 % depending on the heat input rate.

Nyckelord: Convection, Ground-coupled heat pump, Hard rock, Multi-injection rate thermal response test



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Denna post skapades 2012-10-24. Senast ändrad 2016-08-19.
CPL Pubid: 165056

 

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Institutioner (Chalmers)

Institutionen för energi och miljö, Installationsteknik (2005-2014)

Ämnesområden

Building Futures
Energi
Hållbar utveckling
Samhällsbyggnadsteknik

Chalmers infrastruktur