[Stoves] Relative Humidity question

[Frank Shields]

Dear Crispin,

 

Just wondering. Why is it so important to measure water vapor in stack gas?
When you put in a chunk of new wood with 20% moisture you get a very high
concentration of water vapor then when that is gone you get the water vapor
of the hydrogen in the cellulose structure turning into water (HHV) if I am
understanding this right.  Such an extreme.

 

Thanks

 

Frank

 

 

Frank Shields

Control Laboratories, Inc.

42 Hangar Way

Watsonville, CA  95076

(831) 724-5422 tel

(831) 724-3188 fax

 <http://www.biocharlab> www.biocharlab.com

 

 

From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of
Crispin Pemberton-Pigott
Sent: Friday, March 22, 2013 5:11 PM
To: 'Discussion of biomass cooking stoves'
Subject: Re: [Stoves] Relative Humidity question

 

Dear Frank

 

That is a really good question.

 

I append the question: what instrument can read a water concentration of 100
mmoles/mole H2O?

 

The same calibration question arises.

 

Thanks

Crispin

 

 

++++++++

 

Dear Stovers,

 

I have a question regarding Relative Humidity. 

A saturated mix of water and magnesium nitrate (for example) at 40c will
produce a 'percent relative humidity' in the air trapped in the container
above of 48.42 +/- 0.37.

 

What does this mean? Is there a value of grams water per cubic meter of gas
(or some other unit) that we can use to calibrate instrumentation measuring
water vapor?  

 

Thanks

 

Frank

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