الفهرس 
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Abstract
Since solar energy is available only during daylight hours of a certain periods of the year, a means of providing heat on a continuous bases from this intermittent source is required. This can be done by storing energy during daylight hours for later use. Energy storage provides a useful means of improving solar system performance. In this thesis, detailed theoretical models have been developed for both sensible and phase-change energy storage units. The present detailed models took all the assumptions made in earlier studies into account.
The transient simulation program (TRNSYS) developed at Solar Energy Laboratory, University of Wisconsin-Madison was used to determine the performance of the solar heating systems. A comparison was made between the solar system performance obtained using the present detailed models and the corresponding performance obtained using the assumptions made in earlier studies for both air and water-based active solar heating systems. The effects of varying the melting temperature and latent heat of the phase-change materials on the performance of air-based solar active heating systems were also examined. These effects were studied for different locations and different heating season months.
A sensible energy storage material called ’Abu-Siebera clay’, which is found in Abu-Siebera, Egypt was investigated to test its performance as a sensible store medium.