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Author Topic: Advice for beginner please re WBS+PV  (Read 6575 times)
iank
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« Reply #15 on: October 11, 2010, 09:00:45 PM »

Many thanks for this usefull advice which has saved us from 2 bad errors

Firstly, not putting in a massive WBS that requires an almost full time job feeding it. I envisage doing more with my recent retirement than spending it at the saw bench.  The calculations given to us by AL will be helpful in deciding the size of stove. We generally like a colder house, and only felt cold when internal temperature got to about 12degrees when we lived in glasgow.
Is there anywhere I can find out the estimated wood requirements for different size stoves? I think we will go for a reasonable size stove that will not break our backs, the biggest accumulator tank we can fit in, run the stove flat out for a bit, and hopefully have a couple of days off.

Secondly, not having a back up heating scource. I guess we will stick with the oil boiler, as it and tank are already there, although LPG would be preferable environmentally and for cooking, but would need to buy amd install a new boiler.
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Brandon
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« Reply #16 on: October 11, 2010, 11:40:49 PM »

Is there anywhere I can find out the estimated wood requirements for different size stoves? I think we will go for a reasonable size stove that will not break our backs, the biggest accumulator tank we can fit in, run the stove flat out for a bit, and hopefully have a couple of days off.


The estimate wood consumption of a stove is simple, as you take the rated output in kW (bear in mind that this is in lab conditions) and divide by 4 (due to wood below 20% MC having an energy density of about 4kWh/kg) to give kg/h (the volume will vary with wood species, but the mass required will be pretty steady)

A stove that is not providing an excess of heat to the property will NOT be able to make use of an accumulator, as there will not be any energy to accumulate.  If you have your own supply of timber then it may be worth considering a proper wood boiler and accumulator, even then, if you are using 25kW, then a 50kW boiler will only store 1 hours worth of heat for every hour of burn.

A wood processing effort on par with justme's will be required to heat solely with wood on that scale.

As has been said before, insulate, insulate, insulate, I would advocate a minimum of 100mm of phenolic (or equivalent as a minimum on walls and floor, and 200mm in the roof.  Then start your draught proofing.

HTH

Brandon
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