User Expression set up for cooling capacity

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Hello All,

I am trying to set up user expression for defining the cooling capacity @ system level based on total cooling SF, total cooling capacity and local space area. i have PTAC system and it is system per zone.
For Example,
Total Project Cooling cap = X
Total Project Area = Y

Cooling capacity for each system = #pa("Total Project Cooling cap")/ #pa("Total Project Area")* #LR("SPACE","AREA")

Above expression does not work since i am referencing local space @ system level.

Do anybody have any idea how to recall local space area @ system level.

Thanks in advance.

Vipul

vipulbabriya at aol.com's picture
Joined: 2011-09-30
Reputation: 0

Instead of setting SYSTEM:COOLING-CAPACITY, set ZONE:COOLING-CAPACITY
with this expression and it should work. SPACE is a directly referenced
command from the ZONE command, not the SYSTEM command. Do not input
anything for SYSTEM:COOLING-CAPACITY. PTAC is a zonal system. Each zone
underneath a SYSTEM of TYPE = PTAC gets its own system. All capacity
inputs at the SYSTEM command for PTAC only serve as defaults for the
individual zonal systems. So if your capacity varies by each individual
PTAC, which this expression implies, then COOLING-CAPACITY should be
input at the ZONE.

Kevin

Kevin Madison2's picture
Offline
Joined: 2012-01-24
Reputation: 0