A numerical model has been developed which describes the temperature distribution as a function of time within the storage elements of a Rotating Prism Solar Storage Wall. The model is tested against data obtained from a full-scale Rotating Prism Wall at Sede Boqer in Israel, and found to reproduce the measured temperatures extremely well. The thus validated model is used to predict the performance of such devices in various kinds of climate and to compare this performance with that to be expected from a nonvented Trombe Wall of standard design. In all cases the Rotating Prism Wall is found to provide considerably more useful energy than a nonvented Trombe Wall.

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