[Equest-users] Equest, fan coils and Ashrae

[David Bastow]

Nick,
 
I have put together a number of hotel models, like you are discussing,
where I modeled all the rooms on like 15 floors with the same exposure
all together.  Of course the top floor and the ground floor were split
off and modeled independently, since they have different exposures.
Also, the corner rooms, with four different exposures, for the most
accurate modeling, can be split off and modeled separately.  The
internal heat gains should be similar on all these rooms to model
properly.  I added up all the CFM's, KW fan loads, outside air, and the
heating and cooling capacity of the equipment for all the rooms all
together.  These models modeled accurately compared to actual historical
energy use data of the hotels.
 
David A. Bastow 
McClure Engineering, Inc.  

________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of
Nicholas Lander
Sent: Thursday, September 02, 2010 9:51 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Equest, fan coils and Ashrae


Folks, 
This may be a stupid question but it has me stumped. I'm primarily
concerned with fan coil units, but any HVAC system raises similar
issues:


ASHRAE Appendix G lets you group zones together into thermal blocks as
long as they have the same HVAC systems and loads and orientation. So,
for example, hotel rooms can be grouped as each is identical to the
next. The question is, how do you model the HVAC of this thermal block?


For example, hotel rooms use fan coil units for cooling. A single FCU
uses X-amount of energy based on fan size and pressure drop. So how do
you accurately model fan energy when grouping several zones, and hence
several FCUs, together?


Thanks
Nick
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