Abstract:
Mathematical models were used in this project to find the direct and reflected solar
radiation from the air layer on the surface of the earth per hour based on the total
daily solar radiation on a horizontal surface, also mathematical models has been
used to calculate the radiation of the tilted surfaces. Most of the ingredients used in
this project as data required previews of several solar energy applications thermal
simulation and solar power systems. In addition mathematical models it has been
used to study the movement of the fluid inside the tube (receiver), and study the
effect of direct and reflected solar radiation on the pressure, temperature ,speed,
kinetic energy and forces of fluid inside the tube. As it has been the use of
mathematical models to study the parabolic trough solar collector performances
and estimate its efficiency. present and discuss of changes in amount of solar
radiation incident occur on the surfaces with the changing time and the direction of
the surface results were compared with field studies for October and found that
there is a consensus between the studies theoretical and practical studies by error
of 9.5 Degree . also has been present and discuss the changes that occur to the
properties of the fluid inside the tube (receiver) using the FLUENT simulation
program, were also present and discuss the changes that occur to the properties of
parabolic trough solar collector with time and direction of the surface of the
reflector and the mass flow rate and the concentration ratio. The theoretical studies
compared with the results of laboratory experiments and found there is a difference
between the results of the theoretical study and practical for reasons that have been
discussed and presented. The results obtained in this research useful as data Initial
to get quick estimates of solar radiation and use this results to calculate cooling
loads in buildings ,vegetable drying and solar energy application both electric and
thermal.
