1. Abstract

      The experimental work in this paper compares, under the same environmental conditions and at four flow conditions (2,3,5,7) Lpm, the performance of a solar collector with triangular tubes placed next to grooves of a V-corrugated absorber plate and a solar collector with circular tubes placed on a flat plate. The outcomes were

1-Because the surface area of the corrugated plate V with grooves is greater than the surface area of the flat plate, and as a result, the amount of solar radiation falling on it is greater than the amount of solar radiation falling on the flat plate, so the solar collector with triangular tubes placed beside grooves of V-corrugated absorber plate is more efficient in thermal conductivity than the solar collector with circular tubes placed on the flat plate. Additionally, the triangle-shaped tubes have a larger surface area of contact with the V-corrugated absorber plate than the circular tubes do with the flat plate. This enhances the heat transfer from the V-corrugated plate to the triangle-shaped tubes, which increases the heating of the water used.

2- Increasing the flow water in the pipes of the both solar collectors, increases the volume of heat exchange between the pipes and the water inside it, because in cases of high-water flow, the number of times the water passes inside the solar collector is greater, which increases the water absorption of heat that is generated from sunlight falling on the solar collector. which increases the efficiency of the solar collector. As it was used in this research four water flows, (2,3,5,7) l/min respectively.

Keyword.: Solar Collector, V- corrugated absorber plate, triangular tubes, circular tubes, heat transfer, thermal conductivity, grooves.