This work investigates the performance of a simple solar combisystem in a proposed well-insulated modern house with underfloor heating and compares results with those obtained in the same house built using current and previous UK U-values and various infiltration levels. Two UK locations, Gatwick and Aberdeen, with different climate conditions have been selected to obtain a broad range of results. Heating requirements and floor temperatures for each case are calculated using a dynamic thermal model and used as inputs to the solar combisystem modelled in TRNSYS. Parametric analysis of collector areas and flow rates are undertaken to optimise the performance of the solar combisystem. The results show significantly higher solar fractions for the well-insulated house in both locations compared to the other cases. The work confirms the expectations that solar combisystems perform better in the south of the UK than in the north.
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