This dissertation was written as a part of the MSc in Energy Building Design at the In-ternational Hellenic University. This study involves the simulation of an office building located in Thessaloniki. The aim of this study is to examine a variety of materials, which are integrated in the building envelope, so as to define what impact they have on thermal comfort and building’s energy efficiency. There are two types of construction for the specific building (heavyweight and lightweight) and five types of glazing (clear, low-e summer, low-e winter, reflective, absorptive). Therefore, 10 different simulations were conducted for a 3-day time interval in April, August, October and December. The key parameters of all simulations were the temperature of floor surfaces (affected mean radiant temperature), predicted mean vote (PMV) values and thermostats (influenced heating & cooling energy needs). The simulation results of Energy Plus were assessed and transformed into qualitative results with the aid of ASHRAE Standard 55-2013 and European Standard EN15251.
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