Dear Frank I am not in any position to say how people turn down their fires. By that I mean this is a performance based approach, not a prescription in any way. There are good reasons why people use an open fire. One is that the fire is very controllable.
I will address the efficiency determination separately. One thing at a time, though I agree with your HHV number the pure carbon. I think the H2 number you gave is the LHV (117 MJ/kg). So I am proposing that we segregate cooking appliances into functional categories with BASIC characterisations for each. They are of course driven by the customers and what they think when they buy something. A BBQ (barbie, braai) is a category of appliance that is largely use for roasting and grilling. It usually has very little power control with the food being raised or lowered, covered or not as a means of control. A kettle is a water heater that shuts off automatically if it is electrical. Is that available for LPG or wood pellets or ethanol? Why not? Maybe no one asked. Many people boil a small quantity if water, up to perhaps 2 litres. Cecil has identified this as a 'class' of cooking activity. Heating tea in the evening or morning is common. Sometimes people use LPG for this even if they rarely use it for anything else. This a task highly suited of a small stove that requires no attention and has zero controllability save being turned on and off. Translate that into larger units for heating 5 or 10 or 20 litres of water at a time. None of these require turn down. But none of them are 'cooking stoves'. The requirement, literally, for cooking is a controllable heat source. So the question is on the floor: how much control is enough to be a minimum? Regards Crispin >From BB9900 -----Original Message----- From: "Frank Shields" <[email protected]> Sender: "Stoves" <[email protected]> Date: Fri, 3 May 2013 11:02:49 To: 'Discussion of biomass cooking stoves'<[email protected]> Reply-To: Discussion of biomass cooking stoves <[email protected]> Subject: Re: [Stoves] Stove Definition - controllability _______________________________________________ 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/ _______________________________________________________ Unlimited Disk, Data Transfer, PHP/MySQL Domain Hosting http://www.doteasy.com _______________________________________________ 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/
