# Relating energy consumption to performance Duncan East Sustainability Manager.

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Relating energy consumption to performance Duncan East Sustainability Manager

Degree days The number of days on which the average temperature is below a chosen baseline, multiplied by the number of degrees by which the temperature is below the baseline

Degree days Example – baseline temperature 15.5 0 C On June 9 th 2014 the average temperature over 24 hrs was 14.5 0 C This is 1 degree below our chosen baseline, hence the number of degree days for that day is 1 (day) x 1 (degree) = 1 degree day (DD) On January 11 th, 2010 the average temperature over 24 hrs was -4.5 0 C This is 20 degrees below our chosen baseline, hence the number of degree days for that day is 1 (day) x 20 (degrees) = 20 degree day (DD) Do this for every day of the month or year and you have a measure of how much heating you are likely to have needed