An Engineer in Wonderland - Arguing about solar heating
The solar panels are up, and on a not-very-sunny day got the water in the domestic cylinder up from 22 to 40 degrees, an 18°C rise, requiring 20°C of additional heating to get the cylinder to its operating temperature. The temperature rise in the cylinder would have been greater, as the panel exit temperature was 61°C, but the long feed pipes from the loft to the cylinder are not yet insulated.
But it got me thinking.
At the moment, the two panels are plumbed in parallel.
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A friend showed me these 