The drastically increase in energy demand and the problems resulted from environmental
pollution have led to a serious trend towards energy utilization efficiency improvement through
scientific researches related to renewable energies, particularit
y that Syria has a high solar
irradiance and prolonged sunshine hours.
This research focuses on determining the thermal efficiency for a prototype of a parabolic
trough solar concentrator (PTC) to obtain the optimal prototype thermally and economically
according to climatic conditions in Damascus.
It has been deposited the mathematical model of the studied concentrator depending on the
calculated design parameters through calculating the solar angles equations and direct solar
irradiance throughout the year. And it has been solved this model by using numerous computer
programs (Excel, EES).
This research aims to study the effect of adding alloying elements and heat treatment
of Zinc metal on solar energy absorbing , nine alloys ingots were manufactured by
changing the percentages of added Aluminum and Copper on the pure Zinc, and thes
e
ratios of Aluminum were : (10% , 20% , 30% , 40 % , 50%) to demonstrate the effect of
adding Aluminum to Zinc metal on solar energy absorbing , and ratios of copper were :
(20% , 40%) , as well as we prepare two pure zinc samples with 99.2% of purity , one
was rapidly cooled and the other slowly cooled , to demonstrate the effect of heat treatment
on solar energy absorbing .
In order to measure the solar energy absorbing for prepared samples , we
manufactured a device depends on the methods of heat exchange between solar radiation
and the surface exposed to radiation .
The obtained results showed that adding Aluminum and Copper to the pure Zinc
caused a decrease in solar energy absorbing .
As well as increasing the percentages of adding Aluminum and Copper to the pure
Zinc caused a gradually decrease in solar energy absorbing .
comparing the absorbing of pure zinc samples, one was rapidly cooled and the other
slowly cooled , the results showed that the sample was rapidly cooled was better than the
sample slowly cooled on solar energy absorbing .
