Abstract :
The TRNSYS XST-model for the calculation of the thermal behaviour of ground buried hot water heat stores was
validated. For the validation procedure measured data of the seasonal hot water heat store in Hannover (Germany)
were used. In contrast to previous investigations the temperatures of the surrounding ground were also taken into consideration.
The determination of the heat store parameters was carried out using TRNSYS in combination with the
parameter identification software DF. The deviation between measured and calculated temperatures is less than
±3%. The measured and calculated heat quantities are also in good agreement (annual deviation less than 2%). The
validated XST-model was integrated into a TRNSYS model to calculate the thermal behaviour of the solar assisted
district heating system in Hannover in 2002. The deviations between measured and calculated heat quantities do not
exceed 5%.
2005 Elsevier Ltd. All rights reserved.