This dissertation was written as a part of the MSc in Energy Building Design at the
International Hellenic University. The main purpose of this diploma thesis is to raise the
awareness about the importance of the refurbishment of the active systems of Buildings.
This dissertation takes as a guide the EN15232 standard which proposes various
strategies to upgrade the HVAC and lighting systems of a building. Thus, a sample of
buildings of the Tertiary sector is selected and analyzed not only regarding their energy
consumption, but mainly for the possible implementations and finally the economical
feasibility of these interventions which was evaluated based on the NPV and IRR
indices and the depreciation time. The results showed that the larger the project, the
faster the depreciation of the original investment.
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