[Default] On Fri, 4 Oct 2013 18:14:31 -0400,"Lanny Henson" <[email protected]> wrote:
>2- A few points I am still trying to understand is how to calculate the pot >mass since metal has a different specific heat than water. I am using a 316 >stainless pot so I am using .5 as a factor. Is that about right? Specific heat of water is 4.187kJ/kg, a quick google suggests 316 ss is 0.5kJ/kg so it's less than water by a factor of ~10 but of course it weighs 8 times as much so they are similar on a volume basis. >3- Also I still need the formula for calculating the loss from woods >moisture content. I an drying a batch of wood as I type. Before the moisture >here in NW Georgia USA has been but we have had a wet season and the last >batch was 14.5%. Wood sure does burn well at 14.5% in my stove. >4- Another confusing point is the difference between net and gross calorific I addressed these two points in my earlier post. Weigh the wood first, then dry it at 110-125C until it loses no further weight. Reweigh it and subtract the last figure from the first to get the water content. As a rule of thumb the useable heat (Lower Heating Value), net of losses due to latent heat of vaporisation, is the dry weight times the calorific value for dry wood (18.6MJ/kg its LHV) minus about 2.7MJ/kg for the water content calculated from the above. AJH _______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org for more Biomass Cooking Stoves, News and Information see our web site: http://stoves.bioenergylists.org/
