The article in last month's issue of "Energy Management" gave a brief overview of the Energy Efficiency Office's programme of demonstrations in the housing sector, as managed by BRE the Building Research Establishment. In the case of new housing, these are showing the benefits of integrating packages of energy efficiency measures into the designs of range of dwelling types.
In building design the ability to predict the effects of daylight is of increasing importance. Daylight can be an important factor in building energy efficiency; in some buildings lighting may account for half the energy cost. This paper describes the weather data that are available for daylight prediction. First of all the requirements for data are evaluated. For many energy applications, the key quantity is the percentage of the working year a given design illuminance is exceeded by daylight.
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