navitron
 
Renewable Energy and Sustainability Forum
Welcome, Guest. Please login or register.

Login with username, password and session length
News: Anyone wishing to register as a new member on the forum is strongly recommended to use a "proper" email address - following recent spam/hack attempts on the forum, all security is set to "high", and "disposable" email addresses like Gmail, Yahoo and Hotmail tend to be viewed with suspicion, and the application rejected if there is any doubt whatsoever
 
Recent Articles: Navitron Partners With Solax to Help Create A More Sustainable Future | Navitron Calls for Increased Carbon Footprint Reduction In Light of Earth Overshoot Day | A plea from The David School - Issue 18
   Home   Help Search Login Register  
Pages: 1 [2] 3 4 5 6 ... 8   Go Down
  Print  
Author Topic: Small house WBS / Solar system  (Read 45506 times)
Flamethrower_
Hero Member
*****
Offline Offline

Posts: 745



« Reply #15 on: July 19, 2009, 07:36:28 AM »

Martin W,

I have used a second hand cylinder as a thermal store on a open vented circuit. I have connected my 28mm flow to the top DHW 1" female BSP tapping and the return to the bottom DCFD 1" BSP female tapping,

I have then fitted a retro coil to the immersion boss and connected this to the boiler flow and return on a sealed system, in the line I have an additional pump controlled by a cylinder stat fitted on the second hand cylinder. So this only operates when the cylinder is up to temperature (55c)

The original boiler coil will be used as heat dump circuit for the existing solar (when I get around to it!)

But it works superbly.

Rob



Logged
Stuart
Hero Member
*****
Offline Offline

Posts: 665


Engineer ..... at large


« Reply #16 on: July 19, 2009, 10:39:50 AM »

My understanding (could be wrong) is that as the wbs in an uncontrolled heat source it 'must' be fitted without valves etc directly to a vented cylinder. I don't know how you stand on diverter valves in a wbs circuit.

My thinking is...
The unvented cylinder has a temperature and pressure release valve. If this operates mains pressure cold water rushes in the bottom.
there will be a large heat bleed rad on the gravity circuit, so why not add a valve to the tank circuit to close (wired to fail safe) when tank reaches temperature.
the stove has a air control thermostat, not that were trusting that to regulate temperature, but there will be a high limit stat on the gravity flow to switch in the rad circuit.

a plumber friend, who just does combi's said I could use the old HW cylinder (like a thermal store) and pump the coil circuit to the unvented cylinder coil.
seems like a lot of plumbing.


Logged

8kw woodburner, Big piles of wood, 20 tube solar panel, custom tanks, back up gas boiler, North walls internally insulated
1968 landy that runs on anything and a currently wild meadow garden.

Nr. Tow Law
Stuart
Hero Member
*****
Offline Offline

Posts: 665


Engineer ..... at large


« Reply #17 on: July 19, 2009, 10:42:17 AM »

Oh by the way does anyone know what stops a Solar system being classified as an uncontrolled heat source?
Logged

8kw woodburner, Big piles of wood, 20 tube solar panel, custom tanks, back up gas boiler, North walls internally insulated
1968 landy that runs on anything and a currently wild meadow garden.

Nr. Tow Law
Brandon
Hero Member
*****
Offline Offline

Posts: 1348



« Reply #18 on: July 19, 2009, 10:44:04 AM »

when the power fails, the pump stops and so does heat transfer.
Logged

changing the world, one roof at a time.

Quality is never an accident; It is always the result of
high intention, sincere effort, intelligent direction, and
skilful execution; It represents the wise choice of many
alternatives.
Stuart
Hero Member
*****
Offline Offline

Posts: 665


Engineer ..... at large


« Reply #19 on: July 19, 2009, 10:48:22 AM »

so does the water not then begin to boil in the solar collectors?
Logged

8kw woodburner, Big piles of wood, 20 tube solar panel, custom tanks, back up gas boiler, North walls internally insulated
1968 landy that runs on anything and a currently wild meadow garden.

Nr. Tow Law
sleepybubble
Hero Member
*****
Offline Offline

Posts: 989


expect the unexpected, then its expected


« Reply #20 on: July 19, 2009, 04:44:52 PM »

so does the water not then begin to boil in the solar collectors?

Yes, this is acceptable. If the expansion in the solar loop becomes too great for the Expansion vessel to cope with then the T&PRV on the solar loop would dump. In practice with a correctly sized expansion vessel this would not occur.
The point being though that in a power failure, no further heat is transferred to the unvented cylinder.

I wouldn't be surprise if the building regs with regards WBS systems doesn't get revisted in the next six months, especially with all this hoo ha towards biomass boilers, in the DECC renewables strategy. Of course Brandon would know about that!
Logged

;-)
Brandon
Hero Member
*****
Offline Offline

Posts: 1348



« Reply #21 on: July 19, 2009, 06:30:13 PM »

Of course Brandon would know about that!

what do you mean?
Logged

changing the world, one roof at a time.

Quality is never an accident; It is always the result of
high intention, sincere effort, intelligent direction, and
skilful execution; It represents the wise choice of many
alternatives.
sleepybubble
Hero Member
*****
Offline Offline

Posts: 989


expect the unexpected, then its expected


« Reply #22 on: July 19, 2009, 07:52:07 PM »

Of course Brandon would know about that!

what do you mean?

Sorry but I had thought in another thread you had hinted at working with a manufacturer on getting a pressurised WBS system through building regs?

<I blame my appalling grasp of punctuation and spelling for any confusion>
« Last Edit: July 19, 2009, 09:27:29 PM by sleepybubble » Logged

;-)
martin W
Hero Member
*****
Offline Offline

Posts: 700


what do you mean my snoring is too loud!


WWW
« Reply #23 on: July 19, 2009, 08:13:09 PM »

Oh by the way does anyone know what stops a Solar system being classified as an uncontrolled heat source?

probably too new for th eregs to catch up...  Wink
Logged

Woodstove owner since Feb 2011 Tongue (yes it's finally off the pallet)
Solar Water Heating since 17th March 2009, 2.94kW PV since Dec 2011
Chicken Owner - Self sufficient in chicken c*@p, boy watch those tomatoes grow. Allotment owner since August 2011
Now an Lister wannabie Tongue
Stuart
Hero Member
*****
Offline Offline

Posts: 665


Engineer ..... at large


« Reply #24 on: July 20, 2009, 08:39:23 AM »

Yes am sure I had read somewhere we were way behind Europe in that regard.
The commercial system I've seen are all pressurised, but obviously more complicated than a stove with electronic controls and emergency cold water dumps into the boiler.

So is the solar system fine even if over the 15l (hot water under pressure) the regulations states?
Logged

8kw woodburner, Big piles of wood, 20 tube solar panel, custom tanks, back up gas boiler, North walls internally insulated
1968 landy that runs on anything and a currently wild meadow garden.

Nr. Tow Law
Brandon
Hero Member
*****
Offline Offline

Posts: 1348



« Reply #25 on: July 20, 2009, 09:53:04 PM »

yes I am, but not allowed to divulge details (yet... any day now) Grin
Logged

changing the world, one roof at a time.

Quality is never an accident; It is always the result of
high intention, sincere effort, intelligent direction, and
skilful execution; It represents the wise choice of many
alternatives.
Stuart
Hero Member
*****
Offline Offline

Posts: 665


Engineer ..... at large


« Reply #26 on: July 20, 2009, 11:58:03 PM »

Think i'm just going to leave that wall unplastered for the moment it seems.

Any one got a spare Hunter flue gatherer they way to sell? £135 seems a bit steep!
Logged

8kw woodburner, Big piles of wood, 20 tube solar panel, custom tanks, back up gas boiler, North walls internally insulated
1968 landy that runs on anything and a currently wild meadow garden.

Nr. Tow Law
Stuart
Hero Member
*****
Offline Offline

Posts: 665


Engineer ..... at large


« Reply #27 on: July 23, 2009, 11:15:06 AM »

sorted with a flue gather box. Still not sorted with plumbing. Sad
Logged

8kw woodburner, Big piles of wood, 20 tube solar panel, custom tanks, back up gas boiler, North walls internally insulated
1968 landy that runs on anything and a currently wild meadow garden.

Nr. Tow Law
Stuart
Hero Member
*****
Offline Offline

Posts: 665


Engineer ..... at large


« Reply #28 on: August 01, 2009, 01:51:37 PM »

Just got the quote for getting gas to the house its fairly cheap, so going ahead with it for the hob.
considering a Condensing system boiler as a back up. Mainly to add property resale value too. More complicated than ever now!

 
Logged

8kw woodburner, Big piles of wood, 20 tube solar panel, custom tanks, back up gas boiler, North walls internally insulated
1968 landy that runs on anything and a currently wild meadow garden.

Nr. Tow Law
Stuart
Hero Member
*****
Offline Offline

Posts: 665


Engineer ..... at large


« Reply #29 on: August 12, 2009, 01:24:04 PM »

Hope this pic works as Iím very proud of my little flame drawing.

I'm fairly sure this is the way to go with the bits i have
i just need help designing how the rads and system / combi will plumb in.

would prefer a system boiler as there cheaper and more simple creatures. but if someone thinks pre heating the DHW is the most efficient then we will have to have a rethink.

Obviously I donít want my CH to rob the DHW so i got as far as figuring a thermostatically controlled pump would stop that, as for diverter valves, check valves etc...
well i have to go and work at the house so thatís for later.

 
« Last Edit: October 05, 2009, 12:13:29 AM by Stuart » Logged

8kw woodburner, Big piles of wood, 20 tube solar panel, custom tanks, back up gas boiler, North walls internally insulated
1968 landy that runs on anything and a currently wild meadow garden.

Nr. Tow Law
Pages: 1 [2] 3 4 5 6 ... 8   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.20 | SMF © 2013, Simple Machines
SMFAds for Free Forums
Simple Audio Video Embedder
Valid XHTML 1.0! Valid CSS!