الفهرس 
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Abstract
In this thesis, a double pass solar air heater with a corrugated absorber plate and
built-in external reflector is adopted to improve its thermo-hydraulic performance.
The proposed solar air heater is tested with five tilt angles: 0°, 5°, 10°, 15° and 20°.
Data obtained from the proposed heater are compared with the conventional design
without reflector under a typical six air flow rate 11, 13, 15, 17, 20 and 25 l/s. The
measured results are reported based on some parameters such as thermal, exergy,
thermo-hydraulic efficiencies, cost heat unit and temperature differences. The
heater with external reflector improves the performance parameters when
compared with the conventional heater. Also, increasing the air flow rate enhances
thermal and thermo-hydraulic efficiencies and reduces the production cost. The
energy input configuration has been shown to be the superior effect on the
enhancement of heater performance than the others effects. The maximum
effectiveness and achieved average temperature differences for proposed heater
were 0.74 and 26.5 °C, respectively. The maximum improvements in average
thermal and thermo-hydraulic efficiencies for proposed heater were 19.33 % and
19.84 % respectively. The maximum value and enhancement ratio of average
exergy efficiency for proposed heater was 1.14 % and 27.01 % respectively. The
optimum cost heat unit is achieved using proposed heater estimated by about
0.0047 $ and maximum 93.11 % reduction. The optimum values of the
performance parameters of the proposed heater under study are obtained when the
mass flow rate of flowing air and tilt angle are 25 l/s and 20° respectively.