A Solar Collector with 3D Compound Parabolic Concentrator
Keywords:
Parabolic Concentrator Collector,, Solar energy.Abstract
Solar collectors with compound parabolic concentrator in three-dimensions were designed and constructed by 2 types including a truncated collector with 1 by 5 parts and a full size in the same of the concentrator ratio of 2.4. They were made to produce hot water and to determine the thermal efficiency by the method of ASHRAE 93-77 standard and the real condition using at the water mass flow rates range of 0.005 kg/s - 0.007 kg/s. The inlet water temperature, outlet water temperature, ambient temperature, and solar irradiation falling onto the collectors were measured. The results were found for each type of collectors as following :
The truncated collector was tested using ASHRAE 93-77 standard obtaining the water inlet temperature by average of 52.95 oC, the water outlet temperature by average of 58.32 oC, the average thermal efficiency of 47.00% at the ambient temperature by average of 38.30 oC and the solar irradiation by average of 848.37 W/m2. The real condition using was obtained the inlet water temperature by average of 50.62 oC, the outlet water temperature by average of 57.37 oC, the average thermal efficiency of 65.50% at the ambient temperature by average of 38.25 oC and the solar irradiation by average of 881.78 W/m2.
The full size collector was tested by ASHRAE 93-77 standard obtaining the inlet water temperature by average of 52.95 oC, the outlet water temperature by average of 56.17 oC, the average thermal efficiency of 24.17% at the ambient temperature by average of 38.30 oC and the solar irradiation by average of 848.37 W/m2. The real condition using was obtained the inlet water temperature by average of 50.62 oC, the outlet water temperature by average of 59.48 oC, the average thermal efficiency of 56.00% at the ambient temperature by average of 38.25 oC and the solar irradiation by average of 881.78 W/m2.
It was showed that the thermal efficiency of truncated collector was higher than that of the full size collector while the hot water obtained was nearly same.
References
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