UK_Selfbuild : Message: Re: UK_Selfbuild Insulating "awkward" bits of pipework

Is there a simpler way of preventing self circulation without a motorised
valve? Can it it be done with some sort of low presure non-return valve? I
have been trying to work out how to do this but can't quite figure it out.

Simon

--- In UK_Selfbuild@..., Eric MEARS <Eric.Mears@...> wrote:
>
>
>
> That would indeed cure the heat loss - but have you calculated the payback
> period ?
>
> I haven't done so either but suspect that it might be quite a while.
>
>
>
>
> Regards
>
> Eric Mears
> CHESTERFIELD
> Derbyshire
>
> -----Original Message-----
> From: Lee
> Sent: Tuesday, July 07, 2009 9:15 PM
>
>
> The solution as far as I can see is to fit a 2-port motorised valve, powered
> by the UFH pump supply, so when the pump is off, the pipes are closed.
>

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Hi all Coming out of my thermal store, I have a multitude of pipes. Now, most of these I have insulated along the straight lengths, but there are several...

Lee
leewild80

Jul 6, 2009
7:26 am

I'd be tempted to go for one of the non-adhesive options (sheet or roll) else it'll be a bugger if you ever have to fiddle with the pipework. Nick Nick Laurie...

Nick Laurie
nick115398

Jul 6, 2009
7:36 am

if in a cupboard, maybe some baffles to stop air circulation could work well ? Air's a v.good insulator, so long as it isn't convecting - when it becomes a...

Chris Hunter (home)
chris_j_hunter

Jul 6, 2009
9:09 am

Hello Lee I've used Armaflex tape to stick Armaflex at joins. It only really sticks to foam (like Armaflex or itself) not to pipes etc. That means tou can...

Peter and Jane
pandj.munnoc...

Jul 6, 2009
8:54 pm

Thanks for all the replies. I've ordered a couple of rolls of foam tape that looks like the Armaflex lagging tape but is cheaper (and will no doubt be crap!). ...

Lee
leewild80

Jul 7, 2009
11:40 am

Box it (them?) in and stuff with rockwool? Or use those DHW cylinder jackets you can buy in the DIY sheds and wrap them around? Cheers, Tim....

Tim Hawes
haweste

Jul 7, 2009
5:59 am

another idea is to wrap the joints in plastic bags, and then use expanding foam. I'm thinking the same way equipment is often boxed for transport - put it in a...

WEBSTER, Edward ( kno...
johnw_aka_webbo

Jul 7, 2009
7:26 am

I think I would wrap the item in cling film first so that if (or more probably next week (murphys law)) you did need to service the joint then you should be...

Stephen McGarry
stocksons_se...

Jul 7, 2009
8:58 am

I guess my description was poor. If you use a pair of bags, one either side of the joint, and then fill them both with foam, you end up with two halves that...

WEBSTER, Edward ( kno...
johnw_aka_webbo

Jul 7, 2009
9:11 am

I would think you need to keep the pump bodies exposed, or at least the motor part of it. ... This email (including any attachments) may contain confidential ...

WEBSTER, Edward ( kno...
johnw_aka_webbo

Jul 7, 2009
11:50 am

... I'm pretty sure that the CH circulation pumps at work have a purpose-made moulded EPS insulation "shell" round them, but IIRC it's only round the pump ...

Andrew McLeod
avmcleod2000

Jul 7, 2009
1:31 pm

I have a data logger on mine, we loose about 4-5 C out of the tank, and surrounding pipes overnight (so in 7 hours). We also loose about 2 C at 06:30, when we...

Rick
rickdipper

Jul 7, 2009
2:12 pm

Do you start your CH circulating pump at 06:30? On initial start it'll push round a slug of cooler water which will return to the store and bring down the...

Tim Hawes
haweste

Jul 7, 2009
4:03 pm

... Funny you mention the circulation. I noticed (by accident) the other day, that the flow pipe to my UFH manifold was constantly hot, even though it was so...

Lee
leewild80

Jul 7, 2009
8:14 pm

That would indeed cure the heat loss - but have you calculated the payback period ? I haven't done so either but suspect that it might be quite a while. ...

Eric MEARS
ejmears

Jul 7, 2009
8:30 pm

You'd also want to arrange a delay between valve and pump so that the pump doesn't find itself pushing against a closed valve. Nick Nick Laurie PC Repairs ...

Nick Laurie
nick115398

Jul 7, 2009
9:12 pm

Presumably you could do the usual thing of connecting the pump via the contacts that close when the valve is fully open, just like you do with the normal...

Graham Pye
grahampye

Jul 7, 2009
10:07 pm

Just been discussing the 2-port valve idea on another forum. The simple answer is to power the valve from the pump supply, and then power the pump from the...

Lee
leewild80

Jul 8, 2009
1:58 pm

Is there a simpler way of preventing self circulation without a motorised valve? Can it it be done with some sort of low presure non-return valve? I have...

sj_purser

Jul 7, 2009
10:48 pm

Hi Eric No I haven't looked at the payback period, but for me there's more to it than financial gain. Where the UFH pipes drop down through the wall to the UFH...

Lee
leewild80

Jul 8, 2009
6:57 am

My initial investigations show the hot bits on our stuff are the exposed isolation valves, blending valves, motors, and of course the plate heat exchanger....

WEBSTER, Edward ( kno...
johnw_aka_webbo

Jul 7, 2009
1:42 pm

Simon Exactly so. A non return valve in a pumped circuit will prevent thermo-circulation. Used one on my central heating in the lkast house. Got one in the...

Peter and Jane
pandj.munnoc...

Jul 8, 2009
4:05 am

Interesting - although the thermo-circulation is in the same direction as normal pumped flow, so not sure how this could cure it ?...

Lee
leewild80

Jul 8, 2009
4:21 am

Lee This is the problem, how do you stop thermal self circulation through the pump in flow direction without the use of a motorised valve. I can't think of a...

sj_purser

Jul 8, 2009
10:01 pm

years ago (ie: when my father put-in CH, with a floor-standing gas-boiler & radiators) it was the norm to rely on natural circulation & to have no pump at all...

chris_j_hunter

Jul 9, 2009
8:09 am

... I checked, and it is as I thought. The pumps are enclosed in an EPS shell, so it must be OK to insulate them. Presumably a fair bit of heat will still leak...

Andrew McLeod
avmcleod2000

Jul 8, 2009
9:22 am

I'm sure someone posted that answer earlier today, which is why I didn't bother to respond before. That is certainly how all of our 2 port valves are wired. ...

WEBSTER, Edward ( kno...
johnw_aka_webbo

Jul 8, 2009
2:41 pm

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