Green Building Bible, Fourth Edition |
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Posted By: Doubting_ThomasOurs is all single storey, although the intention is to distribute the long cold feed to the ensuite water heater by running up to the eaves space (approx. 2.8m rise) before dropping down locally.How do you propose to get the air out of this and, more interestingly, avoid it accumulating in use?
Posted By: Doubting_ThomasOK, somehow the resolution has got even worse when postingYep, think the forum software reduced it to 600 pixels wide. Thanks for the PDF, much easier to read.
Posted By: Simon StillYou really want to be able to get properly hot water out of the bath taps to top up a bath - even turned up, thermostatic outlets don't usually get hot enough IME.
Posted By: Doubting_ThomasForgive my ignorance on the air in pipe issue (we never got taught any services classes at Uni or in practice so this is all new to me!). Are you saying that pushing the water up will increase the chances of air ingress somehow?IANAPE (I am not a plumber, either) but it seems to me that water will always have at least a bit of air dissolved in it and anywhere the pipe goes up then down again the pressure will be slightly lower so it's more likely to come out of solution and there will not be any route for it to escape (other than by dissolving again) so it'll accumulate tending to make flow noisy and increasing resistance. I don't know for sure but speculate that something like an air release valve is needed.
Posted By: Ed DaviesIANAPE (I am not a plumber, either) but it seems to me that water will always have at least a bit of air dissolved in it and anywhere the pipe goes up then down again the pressure will be slightly lower so it's more likely to come out of solution and there will not be any route for it to escape (other than by dissolving again) so it'll accumulate tending to make flow noisy and increasing resistance. I don't know for sure but speculate that something like an air release valve is needed.
Posted By: CWattersIs a single triangle symbol a one way valve or a reducer?Reducer. I typed that question then noticed the label on the diagram saying so.
Posted By: CWattersPresumably the )( symbol is for an isolating valve.Flow regulator. Though isolating valves in those positions might be a good idea.
Posted By: Ed DaviesThough isolating valves in those positions might be a good idea.
Posted By: ringiBefore planning on putting in two SunAmps, check you are happy with the cost of them.
Posted By: CWattersI note you have specified a 28mm water softener but with 22mm pipe before and after.
Posted By: CWattersIf it's a single storey house what are the distances like from the store to the WC hot outlets? Long enough for a secondary loop?
Posted By: djhI don't understand why some pipe is Cu whilst other pipe is PEX. We put softened water in the WCs as well
Posted By: Doubting_ThomasI think in a passivhaus build we can't have that much heated pipework from a central store without overheating risk.
Posted By: Simon StillCold tap only for a toilet really is fine - the 'cold' water in the pipe will be at house temperature (ie c20C) most of the time anyway.
Posted By: djhWhy would anybody want hot water to clean their teeth?I think Ringi meant that the hot water could circulate while you used the WC or cleaned your teeth, ready for your shower or wash.
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