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Modelling and energy efficiency improvement of the building of the Municipal Art Gallery of Chania

Kouroutzidou Zografo

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Summary

Buildings today are increasingly expected to meet higher and more complex performance requirements: they need to be sustainable, use zero net energy, promote a healthy and comfortable environment for occupants, be grid-friendly, and be economical to build and maintain. The subject of this Undergraduate Diploma Thesis is the modeling and energy upgrade of the building of the Municipal Gallery of Chania. The main objective is to maintain the ideal indoor environmental conditions foreseen for collection and exhibition spaces, such as museums and galleries, in order to preserve the exhibits and the thermal comfort of the users. The gallery is classified as a Neoclassical one, housed in a three-story 20th century building. The modeling of the building was simulated with the Energy Plus software package and in accordance with the prescribed data of the TOTEE.Based on the results of the simulation of the existing building, suggested energy upgrade measures regarding both the shell and the energy systems (updating the lighting system with the use of LED lamps, replacing the frames with new certified and high energy efficiency ones and glazing, etc.) are evaluated. Changes, such as thermal insulation inside the external walls, on the roof and on the floor in contact with the outside environment, are also taking place. Upgrades are made to the existing cooling and heating systems and the installation of a photovoltaic system using the photovoltaic roof tile technique, so as not to alter the character of the building. The best solutions, chosen according to the European methodology of cost-optimality, have been combined in a last simulation. The results show that the final consumption is estimated at 36,62 kWh/m2/year and that it is possible to achieve high energy savings (76,9%), a reduction in CO2 emissions of 76,9%, as well as economic (Payback Period=6,7 years and IRR = 10,35%) and environmental improvements, although heritage buildings show less flexibility in proposing energy efficiency measures. At the same time, the changes in temperature, relative humidity and thermal comfort indicators are observed and analyzed with the aim of improving the well-being of both the works and the people in the Gallery, the values of which are within the "safe" limits set by the bibliography with some small deviations (14°C -33°C, 33%-61% and PMV: -1-1, PPD: 7%-30% respectively).Lastly, it appears that there are energy efficient solutions for upgrading historical shell buildings, which ensure the preservation of their distinctive architecture and can be transformed into green buildings. At the same time, buildings of great cultural importance such as galleries and museums can, with proper management, reduce their energy footprint while maintaining a healthy and pleasant environment for users and exhibits

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