[Stoves] Stove Definition - controllability

[Lanny Henson]

The minimum control would be enough to prevent food from over cooking and 
to turn up the heat to a point necessary to perform the cooking task.


----- Original Message ----- 
From: "Crispin Pemberton-Pigott" <crispinpigott at gmail.com>
To: "Stoves" <stoves at lists.bioenergylists.org>
Sent: Friday, May 03, 2013 5:11 PM
Subject: Re: [Stoves] Stove Definition - controllability


> 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" <frank at compostlab.com>
> Sender: "Stoves" <stoves-bounces at lists.bioenergylists.org>
> Date: Fri, 3 May 2013 11:02:49
> To: 'Discussion of biomass cooking 
> stoves'<stoves at lists.bioenergylists.org>
> Reply-To: Discussion of biomass cooking stoves
> <stoves at lists.bioenergylists.org>
> Subject: Re: [Stoves] Stove Definition - controllability
>
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