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Pyrheliometer research #55
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Technically, it's the pyranometer that measures GHI |
There will need to be at least 2 sensors for pyrheliometer - one with a collimator, one without.
Where:
In terms of sensors, we'd be getting GHI and DNI (collimated sensor) then calculating DIF.
The collimated sensor (DNI) will need to be on the heliotropic platter so it can be pointed at the sun.
Does the GHI measurement need taking at the same time? Unsure. Assuming several readings will be taken over a period of time (need to investigate) and averaged, simultaneous readings might not be critical.
Assuming readings don't need taking at same time, the best location for the GHI sensor is in the middle of the heliotropic platter on the top side with solar panels. The GHI sensor can't go on the same side as the DNI because the camera lens will be blocking light from at least some directions, leading to flawed measurements. Similar issues with putting it on the outer rim. Only feasible location is the centre of the top side of the platter. The platter would need to be perfectly level when taking GHI measurement. The GHI sensor will need to be wide-angle (ambient light sensor) and not obstructed by solar cells.
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