Abstract

A one-dimensional thermal circuit network model of the collector-storage wall is developed based on the energy balances of the collector-storage wall and the building. This one-dimensional model is compared with a two-dimensional model to determine the effects of nonuniform heat flow through the wall. The results show that a one-dimensional model, which assumes that the air temperature varies exponentially in the flow direction, gives excellent agreement compared with the two-dimensional model. The one-dimensional model is used to determine the effects of air flow rate and gap heat transfer coefficient on the auxiliary heating energy consumption. It is found that auxiliary heating requirements are not significantly affected by air flow in the gap.

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