Mechanical ventilation systems have been adopted in airtight energy- efficient houses in Canada to provide fresh air, remove moisture and indoor pollutants and provide a comfortable environment for the home-occupants. Homes constructed under the R-2000 Home Program are equipped with mechanical ventilation with heat recovery. Since 1984, the performance of approximately 700 R-2000 Homes has been monitored on an annual basis. This monitoring has included the measurement of indoor levels of formaldehyde and the documentation of ventilation system operation.
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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