Sunday, December 9, 2012

Plumbing for Roof Sunbox finished

9 Dec 2012: I made the final connections for the plumbing on the external part Saturday Night, and modified them slightly on Sunday Morning. Very Nottingham…. Then the top surface polycarbonate had to be fitted and I got Henry and Joe (visiting for a concert in the Arena, Nottingham) to lift the polycarbonate into place. 
Before starting with the top surface, Henry and Joe inspected the ETFE panels on the main Sunbox. These are heavy with raindrops, but many of the droplets are on the inside. With an inflated panel, there is a supply of fresh dry air in the cavity all the time. In this case, the cavity is sealed and any vapour in there is showing as condensation at the moment - condensing on the coolest surface which is where the recent rain has fallen. Never mind, I am happy with the improved solar capture for these fronts. Even though the raindrops might stop some transmission, the overall productivity of the panels is increased nearly twofold.The roof Sunbox now has the top lid on, and I have emailed the scaffolder to take the tubes and boards down.
This is the plumbing at the lower end, it is the supply pipe entry. Glycol enters at the lowest point, and if there is any thermal energy in the radiators, the liquid is drawn from the upper radiator. The drain cock makes it easier in future to drain down if I have to.The upper plumbing, as I left it on Saturday night, but on Sunday morning, I realised that the 90ยบ bend was unnecessary (with this wonderful flexible pipe connection) so I connected the supply pipe (right) directly to the copper as I had done earlier with the return pipe (on the left).
Since the photo was taken, I have also comprehensively insulated around these pipes and restored the aluminium duct cover.
  I had an email from Stephen F, who has visited my house in the summer. He commented that the flexible pipes have a small internal diameter and could constrict flow, and if there were particles in the circuit, they might cause a clot. I replied with my various reasons for using the flexible pipes.
1. There is some thermal movement in the radiators, so flexible connections remove risk of copper pipes pulling out of joints, and also, with uncertainty about the precise final location of the sunbox on the roof, the flexible joints allow me to make small adjustments.
2. Some constriction of flow is useful to stop the Sunbox 3 pump accidentally pushing liquid through the Sunbox 4 circuit. The pump on the Sunbox 4 will be able to push through the narrow pipes.
3. We have a strainer in the loop next to the GSHP, so any particles get trapped in one location, making it easier for them to be removed at service intervals.
4. Narrow pipes (15mm) allow the warmed liquid to be carried away more quickly instead of sitting in fatter (28mm pipes) losing heat before being delivered to the ground loop.

7 comments:

  1. Heating and Plumbing system of our house is very important as these both system must be managed in such a way that once constructed can survive long!
    In that case, always hire expert plumber.

    For Plumbers in Texas, Please visit - Plumber in Cypress Tx

    ReplyDelete
    Replies
    1. Hi, and thanks. I am getting a bit fed up with using PTFE tape on my joints, I get far too many small leaks....or perhaps I dont put enough tape on. I am tempted to go back to using good old Plumbers paste on the compression joints!

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  2. Awesome title and nice pics. is not that making dark the roof top rooms?

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    Replies
    1. Hi, the boxes do not cut out winter sun, yes they might reduce daylight very slightly, but each room also has a large main window east or west. The boxes provide solar shading in summer, which is welcome. Thanks for the question, I will add it somewhere.

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    2. Linda, i have added your question and my answer to one of the main posting, of about a month ago when we had snow on the roof.

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    3. I just came onto your post and found it quite interesting. I am also associated with heating birmingham, plumbers birmingham, central heating birmingham and love to enjoy the stuff on the same as its rarely found on internet. Thanks again for writing such a good post.

      Delete
  3. I just came onto your post and found it quite interesting. I am also associated with heating birmingham, plumbers birmingham, central heating birmingham and love to enjoy the stuff on the same as its rarely found on internet. Thanks again for writing such a good post.

    ReplyDelete

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