[Terrapreta] Engineering tool box

[Gerald Van Koeverden]

Joe,

Mea Culpa!

Actually I mean exactly what you are saying, but my message is rather  
confusing since I was referring to the context of a previous posting,  
in a rather convoluted way.

In that previous posting I made the mistake of assuming that the  
specific heat for water and charcoal was the same, that a kilogram of  
char had the same amount of heat energy as a liter of water.  I was  
trying to figure out roughly how much water you could heat by using  
that water to drench hot char fresh from the 'oven.'  Instead of just  
letting that char cool off, I was beginning to speculate on how much  
water - and hopefully steam - one could generate from it.

All I'm really saying in the message you responded to, is that I was  
wrong by a factor of four, without admitting I made a mistake!

Gerrit

On 31-Mar-08, at 6:45 PM, joe ferguson wrote:

> No, it means that a given amount of heat would raise the  
> temperature of the charcoal ~4 times as much as it would the  
> water.  e.g., 1 BTU would raise the temp. of one pound of water by  
> 1 degree F, but it would raise the temp. of charcoal ~4 degree F.
>
> Joe
>
> Gerald Van Koeverden wrote:
>> I realize that there are several real engineers on this list.   
>> For  those of us aspiring wannebe engineers like me, have we all   
>> discovered the on-line Engineering Tool Box?
>>
>> I just checked it for the specific heat of various materials.   
>> The  specific heat of charcoal is only 1/4 that of water, i.e.  
>> 0.24.  Thus  it would take four times as much weight of charcoal  
>> to heat water as  I assumed.
>>
>> http://www.engineeringtoolbox.com/
>>
>> gerrit
>>
>>
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>