TRANSIENT ANALYSIS OF A TRIANGULAR BUILT-IN-STORAGE SOLAR WATER-HEATER UNDER WINTER CONDITIONS

In this paper, the performance of a triangular built-in-storage solar water heater under winter conditions has been studied. The triangular cross-section of the system results in higher solar gain and enhances the natural convection leading to a higher water temperature. The forw ard finite difference technique is employed and initial conditions arc derived from the assumption that the water temperature and the temper ature at each node are in equilibrium with the ambient temperature. Th e performance of the system is analyzed under no flow, constant flow r ate and intermittent flow rate conditions. The effect of the night ins ulation cover is also analyzed. A comparative study of the triangular water heater with a rectangular one is also made. The effect of the ti lt angle on the water heater is also discussed. The efficiency of the system under various conditions is also discussed.