Client - Architon LLP

A thermal analysis of the parts of the building served by Termodeck has been carried out (click here) and an analysis of the themal environment within the atrium has also been carried out (click here).

These thermal analyses inevitably considered the type of glazing since this has a major impact on the solar gains. However, high performance glazing inevitably has lower light transmittance properties which has an impact on the natural daylight received by the building. It is therefore important to perform a daylight analysis in conjunction with a thermal analysis.

Flow Analysis Ltd performed this daylight analysis by constructing the entire building and surrounding buildings in daylight analysis software. 

An analysis of daylight factors was performed on a floor-by-floor and zone-by-zone basis. In addition the effects of increasing window area and changes surface reflectances on the predicted daylight factors were assessed.

A summary of the results is as follows:

• All zones within the atrium have very high daylight factors.
• The building average daylight factor is very high (due mainly to the high values in the atrium zones), and is above the BCO guide office standard of between 2% and 5%.
• The average daylight factor is predicted to meet the BCO guide office standards in all individual zones, apart from one of the old building zones.

Thus it was concluded that the type of glazing necessary to maintain a comfortable thermal environment also results in satisfactory daylight levels.

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