|This is the arrangement from May 2010 to March 2012|
Simplify the circuit
The advent of the Varisol tubes has forced me to make this change - I have been thinking about it since January, and did some very complicated diagrams designed to keep the previous design layout, and add the tubes. I had a brainwave during a Forest football match while we were being beaten 2-1 by the bottom team of the League, Doncaster.
|New arrangement on the garden table|
I can see that there could be an improvement in performance and reliability with the new circuit. With the whole flow going through the panels, there is a risk that if the sun box has a major problem then the entire heat pump cannot work, and this could occur in winter. This has happened this month with the failure of the valve and pump. The circuit requires very large piping and fittings - if I had the simple trickle method, I could have used 22mm or even 15mm piping. When the heat pump has finished a heating cycle, there is a period during which very cold glycol continues to circulate into the borehole running the energy meter in reverse, and cooling the borehole because a large amount has to be flushed through.
|New circuit arrangement, simpler and more reliable.|
(prior to fitting thermal insulation).