Log gassifying boiler system

[redgalloway]

Hi all

Im renovating and extending (by quite a bit) an old stone and brick house. the new bit will be heavilly insulated timber frame with a breathable design, the old bit will be upgraded as much as possible/practical in terms of insulation. UFH throughout. 100m2 single storey old part, 70m2 new part but on two floors so 140m2. 0.19 U value for walls in new part. ceilings 2.3- 2.5 throughout.

Im thinking seriously of installing an Atmos log gassifying boiler - the one with a possiblity to run wood pellet, oil or gas as well (any experience anyone?) It will be coupled to a big thermal store with a ladomat 21. I would like to be able to utilise the heat from an existing stove with backboiler and, later on , solar water panels and a microhydro.

My problem is I havent got a clue about what size of system I will need ( ie KW). I have more wood than you can shake a stick at so I dont mind oversizing it a little if it means i dont have to light it so much. Also I dont know what I need from my thermal store in terms of numbers of coils etc.

Any ideas would be very helpful.

Red

[dhaslam]

An output of 25Kw would add about 20 degrees to a 1000 litre tank in an hour so you are into a fairly big scale.  The new part of the house  would manage very well on 2Kw,  but the older part might need more.   I suppose you should scale to a four hour maximum output  burn with 75% going into store allowing 30C rise. That would be 4X25X.75X860/30=   2000 litres odd.   

[daftlad]

How about a masonry stove?
Oi stop groining everyone!
They are efficient, store plenty of heat, only need fireing twice a day, I am glad you are thinking of a gassifying boiler rather than a tin box stove.
laters

[billi]

Hi Red

the thermal store i helped installing only had on coil , from the bottom to the top and provides DHW  all heatsources (woodgasifier in the living room) as well as heating is then connected direct to the store
Solar thermal with an attached heatexchanger

I would like to be able to utilise the heat from an existing stove with backboiler and, later on , solar water panels and a microhydro.

Microhydro would be my first  investigation to find out if it is sufficient to heat /supply my house

All the best Billi

Here is a picture of the store  (with my bad English translation )

[sleepybubble]

to calculate the thermal load on your proposed development use the worksheet available as a pdf, linked from the bottom of this page Whole-House-Boiler-Sizing-Method-for-Houses-and-Flats-CE54

Substitute your DHW requirements over the arbitrary 2000w value. Deduct any input from your existing WBS and you will have a value in Kw to target for your new stove.

Hope that helps.

Mark

[Poolguy]

I know the answer to the solar panel sizing and the themal stor sizing.......!

How many solar panels.... to cover asmuch roof as you have.

How big a themal store..... as big as you can afford!

As an alternative start with Floor area x 10 = thermal store (lts) / 100 = solar panel area (m2)


Its rough but I prefer the first method.

Andrew

[Kombi]

Mark,

I can't get the link to work???

Nicolas

[sleepybubble]

Mark,

I can't get the link to work???

Nicolas

funny works fine here, but isn't that just the way....

http://www.energysavingtrust.org.uk/business/Global-Data/Publications/Whole-House-Boiler-Sizing-Method-for-Houses-and-Flats-CE54

is the full link... then at the bottom of the page it says 'download PDF' if yoy click on that after a bit of whirring and waiting you should have the worksheet to print off...

hope that helps.

[Bill H]

Here is a picture of the store  (with my bad English translation )

Wow Billi - looks like some kind of thermo nuclear thingy... !  

Didn't think they were available to the publik !

Bill