[bldg-sim] People load: BTUs vs moisture

[Dan Johnson]

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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