[bldg-sim] People load: BTUs vs moisture

Larry Degelman ldegelman at cox.net
Mon Aug 7 19:22:44 PDT 2006


Since 0.235 # of water per hour = around 235 Btu/hr, you should be seeing a
little less load than your assumption of 250 Btu/hr latent, but definitely
not 245% more.  By the way, ASHRAE recommended values for people in
restaurants is 275 Btu/hr sensible and 275 Btu/hr latent to account for the
extra heat (30 Btu/hr each for sensible and latent) from the food per
individual.

Regards,
===================================== 
Larry O. Degelman, P.E.                  ldegelman at cox.net 
Prof. Emeritus of Architecture    Ph./Fax: 1-979-696-2506
Texas A&M University
=====================================
 

-----Original Message-----
From: bldg-sim at gard.com [mailto:bldg-sim at gard.com] On Behalf Of Dan Johnson
Sent: Monday, August 07, 2006 4:21 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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