Abstract
A one-node electrical resistance network is considered, which simulates the thermal processes involved in the nocturnal cooling of low thermal capacity radiators. An analytical prediction equation derived from the electrical network behaviour is proposed in order to calculate the transient variation of the ambient air-radiator temperature gradient. A natural relaxation time (i.e., time constant), which depends on the thermal and geometrical properties of the radiator, as well as on the overall heat transfer coefficient at the radiator's exposed surface, characterizes the rate of change of the temperature gradient. In parallel with the analytical treatment, an experimental method is employed to obtain the natural relaxation time of two reduced model radiators tested in the field. These correspond very well with their theoretical counterparts.
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