Monday, March 22, 2010

Modify the Plumbing for summer testing...

22 March: I am already convinced that the Diurnial benefits have already been demonstrated, and now remain to be monitored, quantified and value engineered over the rest of the spring, and next winter.
    Interseasonal benefits are now the bigger research question.
   Therefore I am currently replumbing the ‘magic metre’ during this dull cloudy day, to reduce the number of valves and tees, and make it possible to measure the deep earth temperature at any time during the summer, without having to have the heatpump running – I can do this morning and evening. In effect, the loft pump will be able to circulate the entire ground loop without any effect from the GSHP or the sunboxes, and display the temperature on the controlling thermostat. It’s a 3-speed pump, so for testing, I would run it fast, to get a quicker result.
Normal mode

PS why do there seem to be two screwthreads in the world of 22mm compression plumbing?... DOH!!
It makes it so much more difficult when swapping meters, pump and valves, as it requires checking each screwthread visually, and if there is not a match, then the olive has to be squeezed off carefully to release the closing nut... if the olive won't come off, then new pipe has to be cut...  (anybody who has tried compression joint plumbing will recognise the syndrome).
 Testing mode

25 March: The plumbing is modified now, but I will have to do some very clear diagrams to stick on the wall to make it clear to anybody after me how the valves are to be arranged for  running, or testing. I also had to move all the Electrics about 100mm to the right, realising that the previous position was dangerously close to the glycol expansion bottle.
 The lever ball valves just in front of the pump are the only differences in these photos.
 The dimpled tray under the piping is actually an upturned chest freezer lid, someone was using it on the field behind the house when the snow was here, and left it after.... its perfect for catching all the glycol drips when I have to drain the system! I can buy a drip tray of almost the same size from the nearby garden centre, but it is dark green and I wouldn't easily pick up small green droplets of leaking glycol!

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