Public defence in Building Technology: Uniben Tettey

Title: Primary Energy Use of Residential Buildings – Implications of materials, modelling and design approaches
Subject: Building Technology
Faculty: Faculty of Technology
Date: Wednesday 15 March 2017 at 1.00 pm
Place: Room M1083 (Södrasalen), building M, Växjö
External reviewer: Professor Jan-Olof Dalenbäck, Chalmers, Gothenburg, Sweden
Examining committee: Professor Anne Grete Hestnes, Norwegian University of Science and Technology, Trondheim, Norway
Professor Folke Björk, KTH, Stockholm, Sweden
Professor Jesper Arfvidsson, Lund University, Sweden
Chairman: Professor Ann-Charlotte Larsson, Department of Built Enviroment and Energy Technology, Linnaeus University
Supervisor: Professor Leif Gustavsson, Department of Built Enviroment and Energy Technology, Linnaeus University
Examiner: Dr Krushna Mahapatra, Department of Built Enviroment and Energy Technology, Linnaeus University
Spikning: Wednesday 22 February 2017 at 10.00 am at the University library in Växjö


Public defence poster

The building sector is a major user of primary energy and large emitter of greenhouse gas emissions. The construction, operation and disposal of buildings are associated with various energy- and material-related sustainability challenges. Climate change may affect buildings in diverse ways, including their thermal performance, indoor environment and deterioration of building components. Thus, buildings can play a crucial role in the transition to a sustainable society. Different strategies, including improved energy efficiency, substitution of carbon intensive materials and fuels, efficient energy supply can be employed for this purpose. In this thesis, implications of different insulation materials, modelling and design strategies on primary energy use of residential buildings are studied using a system analysis methodology with a life cycle perspective. The analyses focus on production primary energy and CO2 emission implications of different insulation materials in optimising building envelope components. Uncertainties related to modelling input parameters and assumptions and how they influence energy balance calculations of buildings as well as energy savings of different energy efficiency measures are also studied. Further, various design strategies and measures are analysed to optimise the operation and production energy use of buildings as well as their interaction with different energy supply systems under current and future climate scenarios.

The results show that application of extra insulation to building envelope components reduces operating primary energy use but also leads to increased primary energy and CO2 emissions from insulation material production. Input data and assumptions for building energy balance simulations vary widely in the Swedish context giving significant differences in calculated energy demand. Among the considered parameters, indoor air temperature, internal heat gains and efficiency of ventilation heat recovery have significant impacts on simulated building energy performance as well as on energy efficiency measures. Significant reductions are achieved in operation final and primary energy demands while overheating is avoided or greatly reduced when different design strategies and measures are implemented. Overall, the results suggest that significant primary energy reductions are achievable under climate change, if new buildings are designed with appropriate strategies.

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