[TRNSYS-users] Humidity capacitance ratio and internal gains

[David Bradley]

Francois,
>
> I would like to know more about how to set a right value for the 
> "humidity capacitance ratio" in the .bui file.
>
> I know that it is about taking into account the materials in the zone 
> that absorb moisture such as furniture, clothes, etc... but I don't 
> know how to set a correct value for a given type of zone.
>
in the literature that I have seen, people typically recommend values 
that range from 4 to 15. I was never able to find any real justification 
for those values, however.

> Otherwise, regarding the internal gains from the occupants, I am 
> tempted to use a ratio of something like 0.75 for high school kids 
> compared to "standard gain" from adults.
>
> Has anybody had this thought already or should I just stick to the 
> standard values?
>
I recall some ASHRAE research awhile ago showing that energy gains from 
children are actually as high if not higher than they are for adults 
because their metabolism is higher. I would just assume that the high 
school age occupants cause the same latent and sensible gains as the adults.
Kind regards,
 David

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Thermal Energy System Specialists (TESS), LLC 
David BRADLEY                      22 N. Carroll Street - Suite 370 
Partner                            Madison, WI 53703 
                                   USA
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F: +1.608.278.1475
E-mail: bradley at tess-inc.com 
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