Dear all
I am working with type 74 (cpc-solar collector). I am using it in a small circuit for water heating purpose. I had tried to vary the half acceptance angle parameter for cpc (30-65 degrees). Theoretically, with an increase in half acceptance angle value, the geometrical concentration ratio (GCR) will decrease and related by correlation, GCR=1/SIN (half acceptance angle).
Now, the results indicate that with an increase in half-acceptance angle, the collector outlet temperature is increasing. However, it also means that with decreasing GCR, the temperature is increasing. This contradicts the theoretical fact that temperature increase with an increase in GCR.
Besides, in the mathematical reference given in volume-4, page 552, the correlation for useful heat gain, the overall heat loss coefficient (UL) is also not divided by GCR. Generally, in concentrating collectors, the heat losses are divided by GCR.
Any help regarding this doubt will be appreciated.
Thanks
Best regards
Aditi
