Natural cross ventilation to take advantage of air velocity in getting comfort, and solar protection, are the main design criteria traditionally proposed for warm humid climate. Usually, priority is given to natural ventilation related to design decisions such as orientation and windows (size, location and type). However, the wind is the most variable climatic factor, also affected by the urban context, the architectural shape and even, opening and closing windows and doors.
The design of mixed-mode ventilation and comfort cooling systems have taken another step forward with the construction of the Centre for Mathematical Sciences in Cambridge - the new home for the mathematical genius Stephen Hawking. But how energy efficient are the buildings likely to be?
From 1953 to 1975, some half a million high-rise flats were constructed in the UK in response to the need at that time for the rapid provision of substantial numbers of affordable dwellings. For a variety of reasons, including environmental and social problems, many of these buildings were subsequently demolished. However, many housing authorities still own a considerable number of high-rise developments which, while structurally sound, will require to be upgraded if they are to continue in service for rental purposes.
In Sweden, the activity on building new residences has been decreased for a number of years. The building stock as an average has therefore become older and in the future it will be subject for refurbishment. This paper deals with how to optimise retrofit measures, i.e. how to act in order to minimise the Life-Cycle Cost (LCC) of a building. Insulation measures are emphasised but also other retrofits are dealt with such as changing the heating system. It is shown that the heating system has a vital influence on the optimal amount of extra insulation which is to be applied.
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