Exact(50)
It is found that including the borehole thermal capacity substantially affects the design borehole length.
In one example considered, it is shown that the borehole length is 15% shorter when axial conduction effects are considered.
Lower borehole thermal resistance leads to better system performance and/or lower total borehole length and possibly lower installation costs.
These results demonstrate the importance of considering the recovery time in the GHEs design stage to reduce the borehole length.
Effect of borehole spacing on Heat Transfer Rate per unit borehole length (unit HTR) is computationally investigated for multiple Borehole Heat Exchangers (BHE).
Using the transient model instead of the quasi-steady state model leads to a 16% reduction in the required borehole length.
Similar(10)
When minimum inlet fluid temperature is decreased from 5 °C to 0 °C, total borehole lengths and total areas required for the installation of single U-pipe borehole heat exchangers are reduced by 13.3%and75.4%4% respectively, for double U-pipes borehole heat exchangers, the corresponding reductions are 11.5% and 73.1% respectively.
The design of the borehole field is the key element of these systems since the wrong evaluation of the boreholes' length affects the initial costs and/or the energy performance of the heat pump.
Investigation boreholes TB 01 TB 04 (length 10 m) were cored from the machinery platform into roof, floor and sidewalls of the cave (Fig. 3).
When the buried depth exceeds 800 m, the length of borehole per ton must be 0.3 0.5 m and borehole spacing less than 3.0 m (aperture is 100 mm) to ensure gas drainage from the first-mined seam).
Variation of HTR value per length of borehole in time is determined from the experimental data.
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