AN EXPERIMENTAL INVESTIGATION OF AN ELLIPTICAL RISERS FLAT-PLATE COLLECTOR USING COILS INSERT

A flat-plate solar collector system is investigated with five elliptical risers that utilized for heating the water. Two solar collectors are used with and without coil inserts. Four elliptical coils are used as inserts for each risers of the heat solar collector. The two heat collectors are operated during the periods from 3rd to 5th January2019 of winter season with constant tilted angle of 54oat sunny weather in Baghdad city (33.3oN and 44.3oE). The experimental results indicate that the solar collector system with elliptical coils inserts gave the best performance in term of outlet temperature about 13% more than that solar collector without inserts. Also, the efficiency of solar collector with coil inserts increased about 20% than that solar collector without inserts. The present results are compared with previous work and a good convergence in behavior is noticed.