الفهرس 
.Simulation soft wares in Solar Thermal SystemsOnly 14 pages are availabe for public view
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Abstract
Solar energy is now a feasible and affordable alternative to the non-renewable and
environmentally polluting fossil fuels. The conversion of solar radiation into heat,
which can be used for heating systems, is one of the easiest and most direct uses of
this energy. Since the market is flooded with various types of solar energy systems,
such as solar collectors, and because these types are made in different countries
and work differently depending on where they are installed, it was necessary to
assess their effectiveness in order to provide home owners and solar technology
suppliers with information that will help them get the most out of their
investments. This study presents monitoring of the performance of different
commercial types of solar thermal collectors under our environmental conditions at
Fayoum University. The study has been monitored both experimentally and
theoretically by a Swiss simulation software package ‘POLYSUN’. Three
different types of commercial solar thermal collectors were tested (glazed FPC
with selective absorber (SOLE Wasco 200), glazed FPC with non-selective
absorber (SOLE NS 2.00) and U-pipe ETC (SOLE V15)). The tests were
performed at the same time with same conditions: latitude, tilt angle, direct of
installation, global radiation, inlet temperature, ambient temperature. The
monitoring of the performance for the three collectors were also done by using
POLYSUN V 9.1 to show the effectiveness and accuracy of POLYSUN which can
be used to accurately determine a system's output under actual operating
conditions. Based on the results of the simulations, optimizations for the best
operating conditions for these collectors in practical application were chosen. The
practical experiments were run at the same time for the three collectors to ensure
the same environmental conditions. Then comparison between the practical work
and the simulation was made. The results show that the optimum flow rate for the
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tested collectors was 30 l/h. The predicted performance done by POLYSUN
showed excellent agreement with the experimental results for all the tested
collectors. Also, POLYSUN was utilized to predict the performance over 12
months and declared considerable sessions’ impacts on the efficiency of the
collectors. ETC showed more stable performance than FPC over the tested period.
These results are a testament that POLYSUN is a reliable software tool, which can
be used to effectively and accurately design the solar thermal systems.