Making my own thermal store using ecenomy 7!

[cowboyplumber]

I've a bit of a project to do for me dear old pa. He's renovating an old wooden cabin in the wilds of derbyshire and there's no mains water or gas.
there is electric, and i spent this week overseeing the drilling of a borehole (£17k ) .
So we got electric 240 100 amp, and 6000 Gallons an HOUR! at 3 bar on a 32mm incomer!
What i'm thinking is an vented cylinder with 3 x 3kw immersions to act as a thermal store with two finned coils to extract the heat.
On the ch coil flow; pump, two port, conn to phe, rads then nrv on return, then return to phe.
On the dhw: phe, flow switch.
The property will be highly insulated and the dhw will be oprating 2 showers , 2 basins , sink , no baths.
WILL IT WORK?
Cheers,
Cowboy

 

[simond]

I would have looked at a GSHP if you are already drilling a borehole.

But if the drilling rig has gone then an eco7 based thermal store is not a bad idea. I think Chelmer do something like this, if you prefer buying something already made.

What appears to be missing in your post is calculations, ie: how much heat this log cabin is going to need. Without that you are p***ing in the breeze with regards to specifications.

 

[ChrisR]

You could have had a Ground source heat pump while you were at it. Worcester do a borehole system. (that ISN'T the system their MD has in his house which they can't get working).

You could have got a discount on the second hole. Wholesale, like.

 

[cowboyplumber]

Cheers lads, was just running the idea past you to see if it was feasable. i will work on some figures per requirements / heatlosses. As for the heatpump, he's not keen on the capital outlay, plus doesnt trust owt thats not solid state. IE post 1968

 

[Corgigrouch]

plus doesnt trust owt thats not solid state. IE post 1968

Ha Ha Ha ..I was born in 1965 so he can trust my advise to go Ground source heat pump or for a bit less air to air heat pump. Anything is cheaper to run than immersion elements

 

[cowboyplumber]

Think me pa was born in a coal cellar during a bombing raid in 1943, so it rules Viessman out too .
Done some back of fag packet heatloss calcs and I reckon the ch loading is 10 to 11 Kw. Given two (mains) power showers running full pelt for eight minutes a day, I reckon that 250 to 300 of stored water will be plenty of buffer.
What I an trying to get around by using two coils is the 'sludge bucket' reputation of thermal stores, ie by using a CH coil within the cylinder I can create a sealed system using an expansion vessel, prv etc.
Cheers,
cowboy

 

[Agile]

Cheers lads, was just running the idea past you to see if it was feasable. i will work on some figures per requirements / heatlosses. As for the heatpump, he's not keen on the capital outlay, plus doesnt trust owt thats not solid state. IE post 1968

There are Peltier Effect solid state heat pumps but as far as I am aware never used for domestic heating purposes. For some reason those used for electronic equipment cooling are very expensive at about £90 for a 5w unit!

Tony