A solar thermal system uses a parabolic dish collector. the total heat collected by the heater is 2 kW per meter length. Given cross section as 75mm X 125 mm and thickness as 1 m. How to calculate heat flux from total Heat ?
Hello Sarath,
the heat per meter length is typically based on the length of the collector. if you have a 1 m length (thickness) then your total thermal power is 2 kW.
To calculate the flux in the first case (figure a) you will need to consider the area as the three sides, so 0.075*1*2+0.125*1 m2. In the second case instead the area is only 0.125*1 m2. To calculate the flux divide the thermal power by the different areas in the two case.
Good luck!
Hello Silvia Trevisan
I had a same conclusion what you had stated. But in case 1, as per the calculation, if I divide thermal power by area 2000/((0.075*1*2)+(0.125*1)) then the heat flux would be 7272 W/m2. To my knowledge, which is not possible. The maximum heat flux in which the parabolic heater can have receive is 1412 W/m2.
Similarly in case 2 as well where heat flux would be 16000 W/m2.
Looking forward to hearing from you..
Thank you
Hi,
parabolic trough collector can achieve concentration ratios of around 100, thus the flux on the absorber pipe is much higher than typical DNI values.
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