Abstract
A mathematical model based on the forward time step marching technique is developed for predicting the thermal behaviour of a built-in-storage type solar water heater. Using the model, the performance of such a system is studied with and without night insulations as well as for various flow patterns like continuous flow, intermittent flow, instantaneous withdrawal, minimum temperature limit withdrawal, constant temperature withdrawal etc., under three types of orientation, viz. fixed surface, single axis tracking and double axis tracking. It is observed that the sysem performs better under single axis tracking mode as compared to fixed surface mode but the improvement in the performance over single axis tracking is marginal when double axis tracking is employed.
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