Multi-injection rate thermal response test with forced convection in a groundwater-filled borehole in hard rock
(2012) In Renewable Energy 48(December 2012). p.263-268- Abstract
- 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... (More)
- 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. (Less)
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https://lup.lub.lu.se/record/86bbd03a-a773-4aee-98ea-248d9d8b67bd
- author
- Liebel, Heiko ; Javed, Saqib LU and Vistnes, Gunnar
- organization
- publishing date
- 2012
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Convection, Ground-coupled heat pump, Multi-injection rate thermal response test
- in
- Renewable Energy
- volume
- 48
- issue
- December 2012
- pages
- 6 pages
- publisher
- Elsevier
- external identifiers
-
- scopus:84861818426
- ISSN
- 0960-1481
- DOI
- 10.1016/j.renene.2012.05.005
- language
- English
- LU publication?
- yes
- id
- 86bbd03a-a773-4aee-98ea-248d9d8b67bd
- date added to LUP
- 2016-04-15 11:54:47
- date last changed
- 2022-04-16 08:31:25
@article{86bbd03a-a773-4aee-98ea-248d9d8b67bd, abstract = {{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.}}, author = {{Liebel, Heiko and Javed, Saqib and Vistnes, Gunnar}}, issn = {{0960-1481}}, keywords = {{Convection; Ground-coupled heat pump; Multi-injection rate thermal response test}}, language = {{eng}}, number = {{December 2012}}, pages = {{263--268}}, publisher = {{Elsevier}}, series = {{Renewable Energy}}, title = {{Multi-injection rate thermal response test with forced convection in a groundwater-filled borehole in hard rock}}, url = {{http://dx.doi.org/10.1016/j.renene.2012.05.005}}, doi = {{10.1016/j.renene.2012.05.005}}, volume = {{48}}, year = {{2012}}, }