[BLDG-SIM] infiltration heat loss in summer

[mbusman@xxxxxxxxxxx]

Ian,

You might want to look at what thermostat setpoint you are using in your
model.  If you look at TMY stats for the June-Sept. period, the average dry
bulb temperature ranges from 72.4 deg. - 76.9 deg.  If you have a setpoint
in your model of 78 deg., it's quite possible to get sensible cooling
calculated.  If you've ever lived there, the reality is that you'll probably
set the thermostat at 70-72 degrees in order to feel comfortable, run the
A/C most of the time, and be thankful that Georgia Power electric rates are
some of the cheapest in the country.

You might also look at how your bldg. mass is defined and run some hourly
reports on outside air 
drybulb temperatures nside space temperature, status of A/C system (on or
off),and compare.  You might find hours at night that are cooler than the
thermostat setpoint, but heat stored during the day might be causing your
A/C system to keep running, or if you shut off the A/C, the space temp. may
remain above setpoint.

Regards,

Mike Busman, C.E.M.
Senior Project Engineer
NORESCO, LLC
17671 Cowan, Suite 206
Irvine, CA  92614
tel. 949-253-3533, ext. 303
fax  949-253-2049

-----Original Message-----
From: Ian Doebber [mailto:idoebber@xxxxxx]
Sent: Saturday, January 31, 2004 7:49 PM
To: BLDG-SIM@xxxxxxxx
Subject: [BLDG-SIM] infiltration heat loss in summer


Analyzing my summer component loads for Atlanta GA, I discover that the net
sensible effect of infiltration is negative.  In other words, infiltration
sensibly overall cools my house during the summer.  The infiltration latent
effect is as it should be, adding heat into the house.  When I view
pre-existing data on summer infiltration effects on homes the reported
effect is that it heats the house.  I am wondering if data showing sensible
cooling effect of infiltration during the summer is legitamate and that the
published summer effects of infiltration adds the latent and sensible
infiltration effects together to get a rough estimate of the overall
infiltration effect during the summer.

Thanks
Ian


======================================================
You received this e-mail because you are subscribed 
to the BLDG-SIM@xxxxxxxx mailing list.  To unsubscribe 
from this mailing list send a blank message to 
BLDG-SIM-UNSUBSCRIBE@xxxxxxxx

======================================================
You received this e-mail because you are subscribed 
to the BLDG-SIM@xxxxxxxx mailing list.  To unsubscribe 
from this mailing list send a blank message to 
BLDG-SIM-UNSUBSCRIBE@xxxxxxxx