A large number of EnergyPlus energy simulations were carried out in order to assess the cost-effective potential for energy efficiency refurbishment of a case study office building in London. Parameters varied were thermal efficiency of fabric, glazing, lighting power and air-tightness. In all 981 permutations were modelled. Results of the simulations were used in life cycle cost and life cycle carbon analysis to assess the life cycle impacts of the measures. Linear regression was used to derive a surrogate model of energy savings, such that additional analysis could be undertaken by varying parameters in the model rather than through further EnergyPlus simulation. This model was then used to estimate optimal internal wall insulation thickness for the case study building.
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