- Moisture meters
Like for firewood, paper, floor substrate etc.
Do they report a reading of moisture as a percentage of volume or mass?
Am trying to work out the change in mass of a sample of wood as a result of a change in moisture content reading – since I have figures for density of water and dry wood matter I just need to know whether the ratio is by mass or volume. I think ❓Posted 4 years ago
Actually, a bit of google foo (cheers arbtalk) has unvealed the following:
Average weight of seasoned timber 15%moisture content
so 1000000/2160=0.002160 x 600 = my log should weigh about 1.29kg when ‘dry’. Another [furniture] site gives pine to be 400kg/m3 which would mean my log should weigh about 860g when dry but that could be very very dry.Posted 4 years ago
What species of timber is it?
Which part of the tree?
(All variable )
And all irrelevant for energy calcs as all wood (lignin) has basically the same energy and mass density regardless of species or age etc, as long as you are doing your are taking into account moisture content you can calculate the total net energy within a sample with basic maths. (more or less)
zokes – I might tray that one day. What Im trying to do is make an estimate of the total mass of moisture free wood matter in a pile based on some samples and adjusting for moisture content (by mass it would seem) to project total net energy output at a forecast moisture level of c.15-20% when the wood is seasoned.
I use a moisture meter sharkbait. A tenner of eBay.Posted 4 years ago
Ah roight, so per mass unit, does wood give out the same energy regardless of species? So, say a piece of oak will be heavier than a piece of pine, but will contain roughly the same amount of lignin per mass unit? And therefore will give out more heat? Is that what you mean?
My phone autocorrected MM to MulletusMaximus as I tweet him and it’s a shortcut. 😕Posted 4 years ago
I thought you were passing nastursiams about my hair cut again!
The MM is a chinese thingy. Im fairly happy that it’s accurate enough for my purposes and doubt its any much worse than a branded one.
For a given moisture content the amount of energy per Kg released from any two species of tree will be more or less the same.
So, now that I know that the MM reads moisture as a proportion of mass I can do my calcs…
Had a BIG day at the coppice last weekend. Will post a thread in a few days when Ive sorted it all out. But all I will say is mcmoonter better be sitting down for this one 😉Posted 4 years ago
The meters we use (for concrete and wood) cost upwards of three hundred squid. 😯 But they’re Tramex and unless you’re using one on a site, everyone gets a bit sniffy. I’m sure that’s how they survive.
Tbh, I often wonder if a chinese jobbie from eBay would be accurate enough to do for say a year, chuck it and buy another one.Posted 4 years ago
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