how much water vapour does a small propane heater generate ,i have a
small workshop and every yeat the metal ceiling suffers from
condensation and i have to cover everything with plastic to avoid
damage to my tools,would a propane heater make things worse?,thanks
Propane would make it worse as it produces water vapour
I sometimes use a calor heater in my workshop but have a window open to keep
the moisture down
I would put up a false ceiling of insulated material as it would be the cold
roof causing the water vapour to condense and provide a bit of ventilation
let the damp air out
then maybe some heating like an electric tube heater
Propane is C5H12 so the equation for its burning is
C5H12 + 8O2 = 6H2O + 5CO2
Since the atomic weights are near enough C = 12, H = 1 and O = 16, 72 g of
propane (5x12+12) gives 6 x18 = 108 g of water.
So 1kg of propane will make (1000/72)*108 = 1.5kg of water.
On Sun, 03 Oct 2010 17:32:35 +0100, The Natural Philosopher
Are these comments about gas heaters generally or only in the OP's
uninsulated workshop? I ask because I see B&Q stocked full of butane
heaters each winter. Why would anyone buy them if they are that bad?
Are they better inside an insulated house?
When our CH broke in the winter, I used fan heaters. I suppose fan
heaters can start fires but thought they were safer than these butane
heaters since there seems to be a story most years about someone being
poisoned by them.
Unflued, like the portable gas fire type, produce around a litre of
water for every kg of gas burnt.
Which is fine if you still have power... There were several stories
last winter that a failure in the gas supply and the giving out of
fan heaters to those affected soon lead to the failure of the local
electricity supply as well.
We have a portable butane heater for when the power goes. Just looked
at it's rating plate 4.2kW (knocks the spots of a fan heater...) and
burns 301g/hr flat out, so thats a mug full of water per hour. We
don't need to use it flat out, it normally runs on one or two (from
three) radiants. How much moisture does a human put out per hour?
On Thu, 07 Oct 2010 07:00:30 +0100, Chris J Dixon wrote:
Maybe another factor. How much does 15kg Butane cylinder cost on the
return empty, take away full basis?
15kg butane (using the figures on my heaters rating plate ) provides
(15/0.3) * 4.2 = 210 kw (ish).
Well as long as B&Q et al don't advertise the drawbacks,
then students, pensioners and those on a tight budget will
be tempted. After all, it's a gas heater i'nt it? and much
cheaper than those in the gas showrooms.
NOTE Email address IS correct but might not be checked for a while.
the metal roof needs insulating somehow.
Is it corrugated metal? - obviously fibreglass is the cheapest option, but
you'd have to find a way of getting it to stay up there - if there's
internal rafters, you can cut the fibre to fit inbetween these, then staple
garden netting over the timbers to prevent it falling back down.
Doesn't look fantastic but does the job
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