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RE: [EnergyPlus_Support] Re: Plant Demand Error
The domestic hot water can certainly impact the plant loop. When hot
water is "used" it is replaced by "new" water that can be colder. You
can set the temperature of this new mains water in different ways.
_____
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of energypluser
Sent: Thursday, July 20, 2006 3:14 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Plant Demand Error
Dear Mike,
I have check the coil total cooling load. The sum of the two coils is
less than 27kW.
But the plant cooling demand is still 35kW.
In the csv file, I find that the sum of the flow rate through the two
coils is equal to that of the
chiller. And the temperature difference of the coil inlet & outlet node
is almost the same of
the chiller.
I use the formula Q=Cp*Mdot*DeltaT to calculate the heat transfered.
I find that the heat transfered from the chiller is corresponding to the
plant cooling demand.
But the heat transfered in the two coils is corresponding to the zone
cooling demand. And it
is 10kW bigger than the sum of the coil total cooling load from the csv
file.
I really do not think that the pump and fan can add 10kW cooling demand
to the loop.
Can I just increase the setpoint of the cooling loop to fix this
problem?
I remember that the coil cooling demand and the loop cooling demand is
matched before I
added the domestic water object. Does it have some influence on the loop
cooling demand?
The domestic water is operating when the coil are suppling chilled air
to the zones.
Thank you in advance
mac.cz
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