The performance of a built-in storage water heater can be improved by using a baffle plate in the absorber tank. We have studied the following different design conditions: 1.(i) a water heater with baffle plate and with night insulation cover,2.(ii) with baffle plate and without night insulation...

We have considered the general case of a collector with four reflectors. An analytical model is developed for study of the effect of an individual reflector on the collector. Reflectors R-1, R-2, R-3, and R-4 face south, north, west, and east, respectively. For a collector with two reflectors...

This paper presents transient analysis of an evacuated tubular solar collector. Basic energy balance equations for the glass envelope, the absorber and the fluid are solved using the finite difference technique to predict the various component temperatures as a function of time. Four versions of...

In this paper we have presented the design and steady-state analysis of a solar thermal system employing a phase-changing fluid as a heat carrier for transporting thermal energy from the collection side to the user side, without the use of an external mechanical device. The connection between...

The Republic of Botswana is one of the sunniest countries in Southern Africa. It has very little cloud cover, insufficient rainfall, very low humidity, and very low wind speed throughout the year for most parts of the country. The daily extremum temperatures appear to be very much related to...