VALIDATION OF A COMPUTER MODEL FOR SOLAR COUPLED ...

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VALIDATION OF A COMPUTER MODEL FOR SOLAR COUPLED ...

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HEATING SYSTEMS WITH BOREHOLE THERMAL ENERGY STORE ... thermal behaviour of the solar coupled district heating system in Neckarsulm a TRNSYS.

EFFSTOCK 2009, Stockholm, Sweden, June 14-17 2009

VALIDATION OF A COMPUTER MODEL FOR SOLAR COUPLED DISTRICT HEATING SYSTEMS WITH BOREHOLE THERMAL ENERGY STORE J. Nußbicker-Lux1), W. Heidemann1), H. Müller-Steinhagen1), 2) 1)

Institute of Thermodynamics and Thermal Engineering (ITW), University of Stuttgart Pfaffenwaldring 6, D-70550 Stuttgart, Germany Tel. +49-(0)711-685-63536, Fax: +49-(0)711-685-63503 [email protected] 2)

DLR Stuttgart, Institute of Technical Thermodynamics (ITT), Germany Pfaffenwaldring 38-40, D-70569 Stuttgart, Germany

ABSTRACT Using measurements acquired from the Neckarsulm Borehole Thermal Energy Store (BTES) the Superposition Borehole Model was closely checked. The model has for the first time been used to investigate a twice extended BTES. At a thermal conductivity of 2.3 to 2.4 W/(m⋅K) and a volumetric heat capacity of 2.85 MJ/(m³⋅K) the correlation between measured and calculated data was best, i. e. the maximum difference between heat quantities was about 3%, while the maximum difference between temperatures was about 3 Kelvin. To calculate the thermal behaviour of the solar coupled district heating system in Neckarsulm a TRNSYS simulation model was developed. The correlation between measured and calculated heat quantities was good (