[EnergyPlus_Support] Re: Chiller

["patrik_789" <patrik_789@xxxxxxxx>]

Hello Sankar,

You wrote that I should use the component set point based control 
object to control two chillers, which are connected in parallel.
But such a control mechanism seems not to be adequate, because if I 
set the plant equip flow rate 1 and plant equip flow rate 2, the 
simulation crash
I thought that those Flow rates are the proportioned flow rates of 
the chillers, when one of those could not match the set point 
temperature of plant loop.
In this case the whole mass flow of the plant loop should be divided 
into:

%1 * whole mass flow = mass flow of the chiller 1 and
(1-%1) * whole mass flow =mass flow of the chiller 2.

In addition to that what I thought, I tried to auto size the plant 
equip flow rate 1 and 2. The simulation hasn't crashed, but when I 
had a look at the eio- file, the two following flow rates were 
reported:

Component Sizing, COMPONENT SETPOINT BASED OPERATION, TEST SCHEME, 
Design Volumetric Water Flow Rate [m3/s] Equipment # 1,  -99999. 
   
Component Sizing, COMPONENT SETPOINT BASED OPERATION, TEST SCHEME, 
Design Volumetric Water Flow Rate [m3/s] Equipment # 2,  -99999.    

Could you please point us in the right direction toward the 
solution, or could you explain us, how the component set point based 
control object is intended to be used.

Best regards

Patrik





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