Responses to changes of energy input to an enclosure are exponential in nature. The time scales are characterised by active (heating) and cooling (passive) time constants. The time constants can be evaluated from room construction parameters. Heating and cooling paths are followed sequentially rather than simultaneously. A method for predicting heating and cooling trajectories is presented. Verification of the proposed procedure is through reproduction of time-temperature records of an environmental test room for which energy input was by skirting.
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