Posted by Solar Flare on November 6, 2005, 7:15 pm
Also this would mean the power draw of the pump would vary with the net head it
has to perform after filling the top items etc.
Next item: What models are there out there using this technique and how
inefficient and/or noisy are they?
Posted by Christian Kaiser on November 6, 2005, 7:47 pm
Maybe it's some misunderstanding from a language point of view, but the
electronics that could regulate the speed of a pump will automatically drive
the pump in the best way: by temperature sensor value differences.
If the pump's too slow, the difference of the collector temperature to
return pipe temperature will rise, thus the pump's speed will be increased,
which lowers the temperature difference, ... etc.
Thus measuring this data, the pump will be driven with the optimal speed
necessary for best efficiency.
At startup, when the collectors are empty, the temperature difference will
rise very fast (empty collectors heat up like the devil), so the pump is
given maximum power. Then, when the collectors and pipes are filled, this
will slow down until the collector's temperature is some defined difference
above the temperature of the outlet of the heat exchanger.
Posted by Solar Flare on November 6, 2005, 9:00 pm
Is this a standard hydronic heating pump control function then?
Posted by Christian Kaiser on November 7, 2005, 11:55 am
Nope, a solar control (UVR 61-3 from www.ta.co.at).
Posted by Solar Flare on November 8, 2005, 12:01 am
My German isn't too good though.