While calculating the efficiency of evacuated tube collector Solar air heater, how to calculate the Intensity of solar radiation? Is it measured directly using a solar radiation measuring instrument or can also be calculated using equations ?

2. Also what is the aperture area of the collector to be used in the same formula for calculation of efficiency. ? 

The formula i am using for efficiency calculation is - 

Q = m * c * (Tout - Tin ) / ( A * S )

Where 

S = Solar intensity 

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