Hourly estimation of temperature using wall transfer coefficients

A procedure is described to estimate comfort and other temperatures in a simple massive room as it responds to ambient temperature, solar gain through walls and a window, and internal heat gains, with the possibility of a variable ventilation rate. Alternatively, it evaluates the heating or cooling load needed for a specified value of comfort temperature. The exchange of heat within the room is expressed using the rad-air model. Wall heat flows are handled using the wall transfer coefficients, bk, ck and dk which process meteorological and other hourly data. The procedure is illustrated using some hourly data in the CIBSE Guide but is intended for eventual use with hourly weather records so as to identify, for example, periods of possible overheating and to estimate seasonal energy needs.