Dear Jeannie,
For v5, I do it manually after getting the simulation to run by
looking in the output for the E+ calculated sizes. I like to use the
HVACSizingSummary Report to find the autosized capacity, then manually size the
equipment with the desired additional capacity.
Remember that when you manually size one piece of equipment, it often
affects other equipment. E.g., Sizing the chiller affects the pump, coils and
air loops. I have not spent much time trying to figure this out, so to be safe
I generally autosize everything or manually size everything. I know you CAN
mix manual and auto sizing, but you can get problems from doing so also.
A possible shortcut is to make the Sizing:Parameters SizingFactor
= 1.15 (which affects both heating and cooling). If the unmet load hours are
below the maximum threshold at 1.15, I sometimes don’t bother changing
the heating factor to 1.25
p.s., I am delighted to hear that v6 can do this automatically!
Thanks E+!
The Building Performance Team
James V. Dirkes II, P.E., LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Linda Lawrie
Sent: Thursday, September 30, 2010 10:14 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] ASHRAE Equipment Capacity Sizing
Factors - Different for Heating and Cooling
one waits until V6 is released.
At 08:11 AM 9/30/2010, jeannieboef wrote:
Sizing:System, Sizing:Zone and Sizing:Parameters don't differentiat the sizing factor for heating (1.25) and cooling (1.15)...how does one go about this?
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