Achieving urban sustainability is a complex process that includes improving buildings’ resilience and energy efficiency by using the optimum thermal insulation solution. With the advent of new energy restrictions, it is very important to find the best compromise between the price of the thermal insulation material and energy savings because, sometimes, the initial cost of a thermal rehabilitation seems to be very high. The purpose of this study is to illustrate the variations in the amount of heat energy required by a multi-storey residential structure in Romania that uses 14 various kinds of thermal insulation materials. The energy demand is determined using the dynamic method using a building energy simulator that can evaluate the energy usage of lighting, warmth, ventilation, climate control, and water heating.
The purpose of this study is to determine the differences between the steady-state energetic method and the dynamic energetic method in a multi-storey residential building in Romania. For both methods, there are two values for the heating energy demand, one obtained with the theoretical U value and g value according to Romanian Methodology Mc 001/1-2006 and one with the real U value and g value obtained from in situ measurements. The results of our study revealed a difference between the steady-state method and the dynamic method in both cases of approximately 20%. Because the heating energy demand needs to decrease in value according to European legislation and the classical energy demand determination is shallow, as it does not take into account some important factors, it is important to use a method that produces accurate values so the economic factor does not become overwhelming.
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