GCRIS

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Sensitivity and Uncertainty Analysis To Reduce Cooling Requirement of Low-Rise Apartment Blocks in the Hot-Humid Climate Region of Turkey
(Izmir Institute of Technology, 2012) Yıldız, Yusuf; Korkmaz, Koray
Cooling demand in apartment buildings is an important problem due to the global warming today. Implementing passive design techniques to reduce cooling requirements cannot be possible in dense cities. Therefore, energy performance of apartment buildings usually depends on uncertainties caused by local climate and design parameters such as window size, zone height, features of materials and so on. The main aims of dissertation are to determine design parameters that have the most impact on the annual cooling energy loads for low-rise apartment blocks in hothumid climatic region of Turkey, and to evaluate uncertainty in annual cooling loads caused by design parameters and global warming. Global sensitivity and uncertainty analysis methods are performed by using morphology of an existing low-rise apartment block in Izmir, Turkey. The minor aim of thesis is to develop a practical guide to help architects while designing low-rise apartment blocks which have low cooling load located in Izmir. This practical guide was developed by using the results of sensitivity and uncertainty analyses and interviews with architects who have worked on commercial architectural projects in Izmir and are considered to be experts on energy efficiency in buildings. The results show that the sensitivity of evaluated design parameters and annual cooling energy loads in low-rise apartment blocks varies based on the effect of global warming and floors in the apartment block. In addition, total window area, natural ventilation and solar heat gain coefficient of the glazing based on the orientation have the most influence on annual cooling load of low-rise apartment blocks in hot-humid climates. Furthermore, the developed practical guide is feasible and could be used in design process of low-rise apartment blocks targeted low cooling demand in hot-humid climates.
A Method on Energey-Efficient Retrofitting for Existing Building Envelopes
(Izmir Institute of Technology, 2010) Güçyeter, Başak; Günaydin, Hüsnü Murat
Starting in 1970s with the two major oil crises, conservation of non-renewable energy sources became an important concern. Buildings, which hold a large portion of energy consumed in the world, became subject to significant reductions through the energy consuming processes, especially for space heating and cooling energy consumption end uses. Strong initiatives are set in the world, promoting energy efficiency in buildings, both for new designs and existing building stock. However, energy-efficient improvement of existing building stock is a more challenging process for existing buildings; due to lack of energy conscious decisions, which were disregarded during design process. Energy-efficient retrofitting thus becomes an important focus of the research areas that aim to endorse efficiency in buildings Principally with Energy Performance in Buildings Directive of European Union, methodologies to optimize design decisions for energy-efficient retrofitting emerged. In Turkey, energy performance of buildings is recently introduced with a regulation in 2008. Prior to this regulation TS 825 Thermal Insulation in Buildings was the main control mechanism, which was only mandatory a decade ago. The lack of methodological approach and control mechanisms caused the relatively young Turkish building stock, become non-insulated or poorly insulated. Therefore this research focuses on proposing a methodology for energy-efficient retrofitting of public building envelopes, particularly as building types which may raise public awareness on the necessity of energy efficiency in buildings. The dissertation aims to fill the gap of a structured methodology which can be applied throughout defined set of actions to diagnose the existing performance of a building, to propose retrofitting options and evaluate these options to assess an advantageous solution to energy-efficient retrofit of public building envelopes. The thesis aims to indicate the savings in annual energy consumption, reduction in CO2 emissions and improvement in indoor thermal comfort as a result of a retrofitting action applied due to a structured methodology.

Phd Degree / Doktora

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