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|Title:||An analysis of heat flow through a borehole heat exchanger validated model||Authors:||Florides, Georgios A.
|Keywords:||Mathematical models;Heat exchangers;Heat--Convection;Computer simulation;Thermal conductivity||Category:||Electrical Engineering, Electronic Engineering, Information Engineering||Field:||Engineering and Technology||Issue Date:||2012||Publisher:||Elsevier||Source:||Applied Energy, 2012, Volume 92, Pages 523-533||Abstract:||Earth heat exchangers are essential parts of the ground-source heat pumps and the accurate prediction of their performance is of fundamental importance. This paper presents the development and validation of a numerical model for the simulation of energy flows and temperature changes in and around a borehole heat exchanger when a fluid circulates through a U-tube. Based on the time-dependent convection-diffusion equation, the FlexPDE software package is employed to solve the resulting boundary value problem that model a heat exchanger. First, the mathematical model is validated through a comparison with data obtained from experiments with real borehole set-ups in Cyprus. Then the validated model is used to study the heat flow and the temperature variation in the heat-exchanger. Finally conclusions are extracted on how various parameters like the U-tube diameter, the variation of the ground thermal conductivity and specific heat and the borehole filling material affect the temperature of the inlet and outlet fluid.||URI:||http://ktisis.cut.ac.cy/handle/10488/6748||ISSN:||03062619||DOI:||http://dx.doi.org/10.1016/j.apenergy.2011.11.064||Rights:||© 2011 Elsevier Ltd.||Type:||Article|
|Appears in Collections:||Άρθρα/Articles|
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