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Optimal sizing of borehole heat exchangers (CROSBI ID 163269)

Prilog u časopisu | prethodno priopćenje

Ruševljan, Miroslav ; Soldo, Vladimir ; Ćurko, Tonko Optimal sizing of borehole heat exchangers // Strojarstvo : časopis za teoriju i praksu u strojarstvu, 51 (2009), 5; 473-480

Podaci o odgovornosti

Ruševljan, Miroslav ; Soldo, Vladimir ; Ćurko, Tonko

engleski

Optimal sizing of borehole heat exchangers

The heat pumps coupled to the borehole heat exchangers (BHE) can serve for heating and/or cooling of buildings. Optimal sizing of BHE is important because of high drilling costs and importance of matching borehole thermal capacity with the capacity of the heat pump. Proper design of such systems is usualy based on complex mathematical simulations that have to be performend not only for peak building loads, but also for building loads that are calculated throughout the whole year. For this reason the building loads have to be analysed in more detail than for sizing of a conventional system. Designers of heat pumps systems coupled to the BHE should also take into acount the long-term temperature changes in the ground surrounding the BHE, which would influence the overall efficiency of the system during its life cycle. The required BHE length is substantially influenced by the thermal conductivity of the ground, that can be only roughly estimated from the local geological data. Experimental thermal response tests provide a good estimate of the ground thermal conductivity and of the borehole thermal resistance. High cost of the thermal response test reduces its application to commercial and institutional objects with the large number of BHE. In this work the overview of calculation methods for the heat pumps coupled to the BHE is presented, with suggestions for optimal sizing of the BHE.

borehole heat exchanger; ground thermal conductivity; heat pump; long-term temperature changes; optimal sizing

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Podaci o izdanju

51 (5)

2009.

473-480

objavljeno

0562-1887

Povezanost rada

Strojarstvo

Poveznice
Indeksiranost