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• W2187802293 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 (<5%). Dimension guidelines for solar coupled district heating systems with BTES were derived with a TRNSYS simulation model. They take both weather data as well as the heat load and the temperatures of the district heating network into consideration. 1. INTRODUCTION Installations encompassing Borehole Heat Exchangers (BHE) have recently gained in interest. For detailed planning validated calculation models play a crucial part in determining the thermal behaviour of installations especially those equipped with Borehole Thermal Energy Stores (BTES). With this in mind the validation of the “Superposition Borehole Model” (SBM) was undertaken. The SBM model is regarding number, type and hydraulic coupling of the BHE one of the most versatile applicable models. This paper describes how the model has been used to investigate a twice extended BTES for the first time using measurements acquired from the Neckarsulm heat store. A parametric analysis was conducted and the results were used to calculate the thermal behaviour of the solar coupled district heating system. Therefore a TRNSYS simulation model was developed and the validation was conducted using data measured in 2004. The solar coupled district heating system in Neckarsulm consists presently of about 300 flats (in 2004: 270 flats), a shopping centre, a school with gymnasium and two residential homes for the elderly. Solar thermal collectors with a total area of 5 670 m² respectively 3.97 MWth (2004: 5 263 m², 3.38 MWth) are installed at various buildings, a carport and at a noise barrier. The BTES has been extended twice (1998 and 2001) and now has a volume of 63 360 m³. The borehole heat exchangers used to charge and discharge the BTES consist of double-U-pipes. Figure 1 shows the layout of the district heating system. The BTES is directly connected to the heat distribution network and charged by the solar collectors by means of two 100 m³ buffer tanks. The two buffer tanks are used for short-term heat storage to balance peaks in heat delivery from the solar collectors. The buildings are connected to the district heating system via a 3-pipe heat distribution network. The heat distribution network is supplied either by the buffer tanks or the BTES, depending on the temperature level. A condensing gas boiler supplies additional heat to provide the required temperature level." @default.
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• W2187802293 date "2009-01-01" @default.
• W2187802293 modified "2023-09-24" @default.
• W2187802293 title "VALIDATION OF A COMPUTER MODEL FOR SOLAR COUPLED DISTRICT HEATING SYSTEMS WITH BOREHOLE THERMAL ENERGY STORE" @default.
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