Naslov
Effect of Borehole Array Geometry and Thermal Interferences on Geothermal Heat Pump System

Autori
Kurevija, Tomislav ; Krapec, Vedrana ; Vulin, Domagoj

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of ECOS 2011 Conference / - , 2011

Skup
ECOS 2011 - The 24th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems

Mjesto i datum
Novi Sad, Srbija, 04.07.2011. - 07.07.2011

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Geothermal heat pumps; Borehole Array Geometry Modelling; Thermal interferences; Thermogeology

Sažetak
Properly sized borehole heat exchanger in geothermal heat pump systems (widely known also as ground source heat pump systems) needs to minimize long-term ground and working fluid temperature changes. These changes occurs due to imbalances of heat extracted from the ground during winter and heat rejected into the ground during summer months, as well as thermal interferences of adjacent boreholes in borehole array. Simple calculations and spreadsheet-based analogical solutions of required borehole length for heat transfer run into difficulties when dealing with such large, complex ground source heat pump heating and cooling systems which use compact borehole array. A number of analytical computer programs are available to simulate how ground loop fluid temperature varies in such complex systems, using so-called ‘g-function’ – a mathematical function dependent on the geometry and shape of the borehole array. The type of calculation involves a type of ‘step-function’, where 24 h ‘step’ of peak loading is superimposed on a top of a long-term base load. In analytical simulation models, the base load is typically specified as the heating and cooling load per month of a typical year, and is simulated as the combination of sequential monthly steps. This paper will show, by simulating long-term operation of complex geothermal heat pump system with multiple boreholes in various geometric arrays, how spacing of adjacent boreholes and thermal interferences influence required borehole length for heat transfer

Izvorni jezik
Engleski

Znanstvena područja
Rudarstvo, nafta i geološko inženjerstvo

POVEZANOST RADA