Incorporation of latent loads into the cooling degree days concept

The cooling degree days concept is a tool to estimate and analyze weather related energy consumption in buildings, i.e. the cooling system electric energy consumption. The main problem with applying this method is that it disregards latent cooling loads. This paper deals with an approach for monitoring electric energy consumption due to cooling in buildings based on cooling degree days, which allows an estimation of latent loads. In addition to applying methods for determining base temperature to base humidity, a new technique is introduced, which is based on a significance test of the enthalpy latent days partial regression coefficient. Analogous to the performance line concept, the influence of latent loads can be presented in the form of a “performance surface” graph. The performance surface is a plot of electric energy consumption as a function of cooling degree days and latent enthalpy days. The above methods are tested on data sets consisting of electric energy consumption data obtained from two buildings and hourly meteorological data.

► An approach based on cooling degree days, which includes latent loads, is introduced.
► The influence of latent loads presented in the form of a “performance surface” graph.
► A new technique for determining the base humidity using the F-test statistics shown.
► Methods applied to the metered data for two different buildings and compared.
► The new approach cannot be evaluated with total electric energy consumption data.