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RE: [EnergyPlus_Support] Coil water flow rate control (Coil:Heating:Water)





If you want to control the flow etc. yourself without knowing the demand changes, etc., why bother to run the simulation usint the weather file.
 
EPlus is controlling the heat transfer according to the heat demand calculated.  If you mismatch them, the result will be set point not met.
 
When you change the set-point temperature of the boiler or the zone, or the ODT, the flow rate will change.

What is the "control" you wanted to have?  If you are thinking of generating the performance curve using EPlus by controlling the flowrate and calculate the heat transferred, it is a different programming input requirement.   Think of what you do in a lab.  You will need all those information as input.  There is no EPlus simulation short cut, without the necessary input data.
 
The Engineering Ref. Manual do have some information on how to generate the heat transfer properties of some heat exchanger types.

 Dr. Li  

 

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: jones.aidan.t@xxxxxxxxx
Date: Thu, 12 Apr 2012 19:05:18 +0000
Subject: [EnergyPlus_Support] Coil water flow rate control (Coil:Heating:Water)

 
Hi,

EnergyPlus will automatically control the capacity of fan coil units (as part of unitventilator, etc) by modulating the water flow through the coil, leading to constantly varying water flow and heat transfer.

Is there a way (via EMS or otherwise) for the user to control the water flow through the coil? If not, is there some way to control the heat transferred in the coil?

Many thanks

Aidan




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