Επίδραση του είδους των θερμαντικών μέσων στην ενεργειακή ζήτηση των κτιρίων

Abstract

This dissertation presents the methods of heating the premises of a building as well as their evaluation according to the way of heat transfer and the differentiated energy demand of each to cover the same energy losses. The categories of heating media (HM) and more specifically the characteristics of the heating media in the way the spaces are heated are mentioned. A detailed study of the energy demand of a building is carried out according to the analysis of thermal losses as well. The differentiation of energy demand according to the type of heating media (HM) is analyzed and the quantitative calculations of thermal losses are presented. Finally, the methodology of the modeling used by the Energy Plus simulation program is presented which, thanks to its data entry capabilities, can give satisfactory results for the energy demand of the heating media of a building. Therefore, with the help of Energy-Plus we can compare the radiators with those of the fan-element bodies (Fan Coil), through the simulation and calculate the energy demand of the building, in order to reach conclusions about the factors that affect the performance of each radiator. We found that the most important factor influencing the energy demand of buildings is the insulation of the building. In conclusion, and as shown by simulations we performed in a typical building, the demand can vary significantly (up to 20%) when the percentage of radiant heat from heating media changes from 0 to 100%. The distribution of losses in ventilation and escape through the shell significantly affects the above percentage of differentiation.