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Author Topic: WBS plumbing layout  (Read 7008 times)
room101
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« on: February 04, 2009, 12:32:38 AM »



This is a rough idea how i am going to install my system, can anybody see any problems with it...

Ta..
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guydewdney
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« Reply #1 on: February 04, 2009, 08:42:30 AM »

If those at the bottom are pumps with one way valves - then why wont the water just circulate round in a tiny loop?

Id be inclined to put a motorised valve there instead. I take it they are to move heat from one tank to the other?

If you just have wbs on - then why wouldnt the water be drawn (for the taps) from the 'boiler' tank? Wont you need another valve - thermo controlled - at the top of each tank? When tank 'a' is hot - open valve to allow water to be drawn off - repeat with 'b'.


Or you could just get a tank with three coils?

Or a valve system to allow the wbs to use the same coil as the boiler?

tell us more Smiley
« Last Edit: February 04, 2009, 08:45:36 AM by guydewdney » Logged

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room101
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« Reply #2 on: February 04, 2009, 03:18:10 PM »

Yep your right, it probably go round in a mini loop, will have to rethink that.

Going to have to have 2 tanks because the WBS is 8m away from the cylinder but only 1m higher, think it would have trouble thermo syphoning, the largest cylinder that would go in the airing cupboard is a 140 liter so having another will help anyway as there is 10 of us in the house with 3 teenagers.

Will be fitting a 30 tube navitron panel in the next couple of weeks, so will need to dump some of the heat during the summer hopefully.
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guydewdney
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« Reply #3 on: February 04, 2009, 05:35:35 PM »

30 tubes - ten people? Flannel baths all round then? Any of the teenagers girls with long hair? That'll spank the 140 litre tank!

So - why not just have a thermostat operated valve at the top of the tanks - if its above 35 degrees (warm shower) then open. No pumps.

Could you heat dump TO the wbs cylinder I wonder? Thereby at least using it - not wasting it?
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room101
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« Reply #4 on: February 04, 2009, 06:28:52 PM »

Yep hoping to dump to the WBS tank and vice vesa, hence the 2 pumps, one to dump from solar to WBS during the summer and the other way around during the winter...

Tank usually cold by 10 in the morning from showers and such like, so hoping to recharge during the day for evening hot water use and no boiler use.

Am going to try to use cylinder stats to control the transfer of heat between the 2..
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Ivan
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« Reply #5 on: February 05, 2009, 12:05:04 AM »

Yep, that pair of pumps won't work. Why would you need two anyway - pumping cold water from cold cylinder into hot cylinder is the same as pumping hot water from the hot cylinder into cold cylinder.

Personally, I don't like the twin tank idea at all. It doesn't work for me. How are you going to control the pumps? Differential temperature of the tanks? Where does the sensor go? What about when someone draws off a load of water. What if the tanks are different sizes, or if it draws off one tank in preference to the other? As soon as some hot water is drawn off, the cylinder will have stratified layers of hot/cool/cold water - very difficult to work out which cylinder has most heat without multiple sensors. Lots of potential problems.

My suggestion would be a single tank, use a pump on the WBS if you can't thermosyphon, but have a thermosyphon rad to cope with pump/power failure, should it ever happen...and of course, you won't get the pipes banging when the cylinder gets over-temperature.
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room101
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« Reply #6 on: February 05, 2009, 12:09:10 AM »

Have no room for a larger tank anywhere  Cry
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dhaslam
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« Reply #7 on: February 05, 2009, 10:46:39 AM »

It is relatively easy to transfer heat from the WBS cylinder to the other one using a difference controller.   What isn't so easy is avoiding mixing the water temperatures ending up with two luke warm cylinders.  Transferring from a coil at the top of the WBS cylinder to a coil at the top of the other one should optimize hot water availability but it does add a lot to expense.   It would be worthwhile to put in a larger cylinder  somewhere and also to use one solar tube for each 5 litres of storage. 
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kristen
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« Reply #8 on: February 05, 2009, 12:25:28 PM »

"Have no room for a larger tank anywhere"

Have you got room for two half-size cylinders side-by-side?

If so maybe some sort of thermo-syphon could be used to distribute the heat.
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