consumption. Then the most suitable solutions and materials will be chosen for optimum energy efficiency. The heat losses will be measured again, and the option of supplementing these losses along with other energy needs (electricity, ventilation) is examined by renewable energy potential. The energy source that is most available in site should be chosen. So the retrofitting of the building in Singapore is a challenging project which requires consideration of efficient and sustainable technologies in order to minimise energy use and maximize comfort levels in the building. 1.2 Building Description The building is located in Singapore. It is a three storey building which has a rectangular shape with dimensions 10.4m height, 18.6m width and 54.4m length. The site plan of the building shows that it is surrounded by other buildings from the north, south and east sides with the first two being much closer (Figure 1). The ground floor is used as an exhibition centre, the first floor as a library and the second floor for offices. The basic spatial requirements for this building include reception areas, toilets and circulation spaces. The office floor includes an office space, a small kitchen area and a photocopy/printing room. The library includes reading rooms, book storage spaces and café. The population density values according to CIBSE guide are 10m2/person for offices and libraries, and 3m2/person for exhibition halls. These values are not expected to be constant for the exhibition centre and library. There are also several aspects affecting the thermal performance of this building, including glazing, wall and roof fabric, and ventilation which can be modified. Population also affects the thermal performance but obviously cannot be changed.
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