I'm using a 5 collectors in series with a differential controller to turn on the pump when the difference of collector outlet and inlet temperatures is more than 5 and turn it off when it is less than 2.But the signal and collector output temperatures are fluctuating too much, also the signal is not compatible with temperature variations.as you can see in the following diagram, the signal is 1 when the outlet temperature is at maximum !
(red line is collector outlet temperature and orange line is the controller signal)
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amirrezaheidary
master student of energy systems Engineering
Sharif university of technology
Tehran-Iran
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