Hydroponics Roofs for Saving Energy of Green Schools in the Cold and Dry climate of Iran: A Comparative Study between Two Broad and Modular Hydroponic Green Roofs

Green schools are a new type of school, in which the use of renewable energy is less than that of conventional schools. In this regard, nowadays, adding green layers to the roof of schools, in addition to increasing the Students' communication with nature, energy saving has improved in these spaces. However, to improve energy saving yield, the priority of these types of roofs in different climates must be identified by scientific investigations. So, the present research has studied two- extensive and modular hydroponic green roofs as common types of green roofs in green schools. For archiving to aims of this research, it has made use of the two methods of numerical computation and simulation method with the help of Energy Plus software8 as a credible software in the field of energy analysis in the buildings. The steps of this investigation have been as follows: In the first step, the heat resistance of two modular and extensive hydroponic green roof have been extracted by numerical calculations.  And In the second step, two green roofs have been simulated for a green school in Shahrekord as one of the oldest cities in Iran. In the following, the results of thermal resistance of the two samples of hydroponic green roofs which are resulted from numerical calculations and also the indoor temperature which is extracted from the simulated schools in the coldest and hottest months of the year have been compared separately in each step. Generally, results of extracted from findings have shown that. the extensive Hydroponic green roof has better thermal resistance in comparison with modular hydroponic green roofs, and also simulations by energy plus software have represented that, the temperature of the space under extensive Hydroponic green roof is closer to the comfort conditions in the cold seasons.