Residential Energy Analysis Using Modified Degree Day Procedures

Abstract

ABSTRACT TO analyze the energy saving potential of energy conservation measures for a particular residential structure, seasonal energy use must be estimated. Several simplified approaches have been used to estimate or predict residential energy consumption. Many of these approaches utilize the heating degree day concept to predict energy consumption during the heating season. Heating degree days have traditionally been calculated using an 18.3 C base temperature. Use of a base temperature of 18.3 C, assumes that at outdoor temperatures below 18.3 C the structure must have an external supply of heat energy. Thus, 18.3 C represents the balance point temperature of the structure. Factors which affect balance point temperature of a structure are internal heat gains, structural thermal characteristics, solar gains, and thermostat setting. With improved thermal characteristics and lower thermostat settings, balance point temperatures are being lowered. Thus, use of heating degree days calculated from a 18.3 C base temperature may lead to considerable error in prediction of residential heating energy consumption. The primary objective of this study was to determine the effects of lowering heating degree day base temperature on prediction of residential energy consumption.