Sounds like pump heat. To check, set the
pump’s rated head pressure to something approaching zero.
From:
Sent: Tuesday, December 29, 2009
12:46 PM
To:
Subject: [EnergyPlus_Support]
losses in plant loop??
Hey there,
I have a model with a central chiller plant serving the water cooling coils of
eleven AHUs.
For an electricity breakdown I wanted to separate the total chiller electric
consumption up into the cooling coils to reflect the cooling electricity demand
of each AHU.
I did this by using the ratio of total cooling energy of each coil (Total Water
Cooling Coil Energy) and the total chiller cooling energy (Chiller Evap Heat
Trans) and assigned this ratio to the total chiller electricity consumption
(Chiller Electric Consumption)
In doing so I discovered a deviation in the cooling energy of about 7% between
the chiller cooling energy and the sum of the water cooling coils energy.
I was not able to explain this difference and was hoping somebody in this group
can help me out or might have experienced the same thing as well.
Thanks,
Tobias
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