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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 7–12kW to heat water circulating in a ground heat exchanger. This high power is commonly supplied with a fuel-fired generator, which...
Persistent link: https://www.econbiz.de/10011263240
The issue of natural and forced groundwater movements, and its effect on the performance of ground heat exchangers is of great importance for the design and sizing of borehole thermal energy systems (BTESs). In Scandinavia groundwater filled boreholes in hard rock are commonly used. In such...
Persistent link: https://www.econbiz.de/10011044580
In this paper different approaches to groundwater flow and its effect in the vicinity of a borehole ground heat exchanger are discussed. The common assumption that groundwater flow in hard rock may be modelled as a homogeneous flow in a medium with an effective porosity is confronted and models...
Persistent link: https://www.econbiz.de/10011045725
A conventional thermal response test (TRT) provides a bulk estimate of the subsurface and borehole thermal properties over the length of the ground heat exchanger (GHE). The measurement of temperature inside the borehole during a TRT can be carried out to further determine thermal properties at...
Persistent link: https://www.econbiz.de/10011041393
of a geothermal system is presented. The procedure is applied to both simulated and experimental TRT (thermal response …
Persistent link: https://www.econbiz.de/10010808201
Ground source heat pump systems are often coupled to the ground by circulating a fluid through vertical Borehole Heat Exchangers (BHEs). The design of a system requires estimates of the ground thermal conductivity and the borehole thermal resistance, which are usually determined by an in situ...
Persistent link: https://www.econbiz.de/10011040424
A modified three-dimensional finite difference model for the borehole ground heat exchangers of a ground-source heat pump (GSHP) system was developed which accounted for multiple ground layers with different thermal properties in the borefield at no groundwater flow. The present model was used...
Persistent link: https://www.econbiz.de/10011041133
borehole heat exchangers (shank spacing), (2) a non-uniform initial thermal distribution (such as a geothermal gradient), and …
Persistent link: https://www.econbiz.de/10011045248
transient diffusive and convective heat exchange phenomena taking place in geothermal structures. The model is validated by … other types of geothermal structures. …
Persistent link: https://www.econbiz.de/10011209492
Ground source heat pump systems often use closed-loop heat exchangers, which depend on the soil thermal conductivity and borehole thermal resistance as parameters. An in-situ thermal response test provides a method to estimate these two parameters. In analyzing the in-situ test, one commonly...
Persistent link: https://www.econbiz.de/10010805742