Assessing thermal performance of office building envelopes : a case study on energy efficiency

Sürmeli, Ayşe Neşen
In this study, the energy conservation potential of selected retrofitting interventions on an office building were investigated, on the basis of which some rational strategies for the improvement of building envelopes in terms of energy, environment and comfort design were proposed. Examined were various measures on envelope constructions that can be retrofitted to existing buildings. By using simulation techniques, the effectiveness of such measures in reducing energy consumption and environmental threat were also assessed. Effects of glazing types, effect of insulation and thermal mass were analyzed as energy efficient retrofit measures to the Engineering Building (MM building) situated on Middle East Technical University Campus, Ankara. The Energy-10 computer program was used for the modeling and simulation of the energy flows through the envelope to examine measures for reducing thermal load. Within this framework, the energy conservation potential of single and combined retrofitting actions was investigated. Based on results from the evaluation model, it was found that a saving of 161.20 MWh in the annual heating load could result, depending on the glazing type. The evaluation showed that thermal insulation is the most effective factor in thermal performance when placed as an exterior layer on walls. The study showed thermal mass has significant impact on increasing the duration, where highest temperatures were achieved, under passive mode. The study also revealed that applying a combination of retrofitting measures which responded to the challenges and opportunities presented by different façade orientations, a saving of 52.41% can be achieved in annual heating energy use in case study building.


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The thesis aims to examine how the formation of façades, that is, the interface with a dual response both to interior functioning and exterior urban fabric, is separated from the totality of architectural design by new technological developments and design intentions. This aim is accomplished in three sections, respectively: “analysis of the façade, the properties and formation process in time”; “examining the façade formation of the high-rise office buildings in Levent-Maslak area in respect to the analysi...
Citation Formats
A. N. Sürmeli, “Assessing thermal performance of office building envelopes : a case study on energy efficiency,” M.S. - Master of Science, Middle East Technical University, 2004.