I'm in the process of buying a couple of multifuel burners for our two downstairs rooms and need to work out what heat output I should be looking for (in KW).
One room is about 15' by 26' with a low (6'2" ceiling)
The other room is about 15' by 29' with an 8' ceiling
Can anyone tell me the formula and if anyone is selling a multifuel burner then let me know.
Thanks
DPS the house is a timber framed wattle and daub affair :)
The main problem is getting a reasonable u-Value for wattle and daub. Once you've got that, the calculation is simple. Anyone like to suggest one? To me, it sounds like it would insulate better than brick.
Also, is the room draughty? Presumably small windows? Are they well fitting? How many outside walls in each room?
Christian.
The rooms are pretty draughty, smallish well fitting windows mostly secondary glazed with 6mm glass. The smaller room has one and a half outside walls along the long edge, the larger room has three outside walls along both long edges and one short edge, it also has two external doors.
Thanks
David
Currently, using 1.5 as a uValue, assuming warm rooms above and besides and designed for -3C outside, I estimate.
3.3kW for the small room. 5.5kW for the big room.This is allowing 3 air changes rather than 1.5 to allow for draughts. Also, I strongly suspect that wattle and daub will provide better than 1.5 uValue.
If, for example, you managed to fix the draughts and have a normal level of ventilation and the uValue turned out to be 0.8, you would get
2.1kW for the small room. 3.2kW for the big room.Christian.
wattle and daub is very similar to (thicker) plasterboard: Key is the air gap/cavity, which should be filled with insulation.
Typical timber frame I have seen is lath on outside rendered (should be lime mortar, most these days been upgraded with DPM chicken wire and cement coat), air gap (mouse runs?) then hazel lath and daub over.
Blimey is that all, I thought it would be a lot more than that.
Thanks
D
Any clue as to a u-Value, though? I presume uninsulated.
Christian.
err- work it out yourself from plasterboard, tinber and air gap values... :D
Having lived in wattle and daub, its better than single brick, a bit better than double brick, but not as good as cavity insulated double brick...
The killer is draughts.
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