[bldg-sim] People load: BTUs vs moisture

[Vikram Sami]

Dan,
Not sure if this is relevant, but have you factored in the reheat load
associated with dehumidifying using a cooling coil? That might be where
your getting the additional load. Also - if you are cooling sensibly
separately, you might want to dehumidify using a liquid desiccant
system. This could end up saving you a lot.




Vikram Sami, LEED AP 
Direct Phone 404-253-1466 | Direct Fax 404-253-1366 

LORD, AECK & SARGENT ARCHITECTURE
Responsive Design * Technological Expertise * Exceptional Service 
www.lordaecksargent.com 


-----Original Message-----
From: bldg-sim at gard.com [mailto:bldg-sim at gard.com] On Behalf Of Dan
Johnson
Sent: Monday, August 07, 2006 5:21 PM
To: bldg-sim at gard.com
Subject: [bldg-sim] People load: BTUs vs moisture

Hi,
I'm designing an expensive residential dining room in Shanghai that will
be dehumidified using the required outside air through a chilled-water
coil and the room's sensible loads will be met using radiant cooling
from an exposed, chilled slab.

When I calculate the cooling/dehumidifying load based on moisture output
per person (using 0.235 lb/hr/person), I come up with a cooling capacity
that is 245% of what I need if I size the system to meet the heat output
per person (250 latent + 250 sensible).

Why do the two approaches yield such different system sizes?  (Or:
why
do the BTU/hr/person numbers not correspond to the
pounds-of-moisture/hr/person numbers?)

Is my moisture load (0.235 lb/hr/person) a good assumption for sedentary
dining in comfortable conditions?

Does ASHRAE Fundamentals list a table of moisture output/person in
different conditions?

Thanks in advance.

--Dan Johnson

Berkeley CA



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