A procedure is proposed for the use of degree-days for building energy monitoring to eliminate anomalies associated with performance lines. Base temperature may be determined from plots of the daily energy consumption and mean daily temperature, or alternatively from second-order polynomial trend lines if only weekly or monthly data is available. The degree-days may then be determined to this base value rather than the published values of 15.5°C. The creation of performance lines for a building based on the true building base temperature then enables building diagnostics, including changes in base temperature with time and the identification of areas where savings may be made. The procedure is illustrated using two examples: heating of the Cumberland infirmary in Carlisle; and the cooling of a naturally ventilated office building. 12 refs.
Primary author(s): Day A R;Knight I;Dunn G;Gaddas R
Vol.24, No.4, 2003, p.221-228
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