Effect of Borehole Array Geometry and Thermal Interferences on Geothermal Heat Pump System (CROSBI ID 577057)
Prilog sa skupa u zborniku | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Kurevija, Tomislav ; Krapec, Vedrana ; Vulin, Domagoj
engleski
Effect of Borehole Array Geometry and Thermal Interferences on Geothermal Heat Pump System
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
Geothermal heat pumps; Borehole Array Geometry Modelling; Thermal interferences; Thermogeology
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Podaci o prilogu
2011.
objavljeno
Podaci o matičnoj publikaciji
Proceedings of ECOS 2011 Conference
Podaci o skupu
ECOS 2011 - The 24th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
predavanje
04.07.2011-07.07.2011
Novi Sad, Srbija