[EnergyPlus_Support] Minimum Humidity Control

["aboyemeplus" <Merid.Aboye@xxxxxxxxxxxxxx>]

With the objective to control minimum relative humidity in a zone, I 
have added the following to an air handling system generated using 
COMPACT HVAC objects THERMOSTAT, ZONE:UNITARY, and SYSTEM:UNITARY.

a) Humidistat controlling RH in Zone 1 according to a specified RH   
schedule.

b) Humidifier located downstream of the AHU "Cooling Coil" and 
upstream of the "Zone Splitter". The inlet and outlet nodes of the 
humidifier are  "Air Loop Outlet" and "Supply Path Inlet". Both of 
these nodes were generated using the COMPACT:HVAC objects.

c)A "Setpoint Manager: Single Zone Min Hum" object with "AHU 1 
Supply Path Inlet" as the SetPoint Node and "ZONE 1 ZONE AIR NODE" 
as the name of the Control Zone Node. Note that the latter field is 
called "Name of a Node list (or Node)" in the IDF, while the I/O 
Reference describes it as the "name of the zone node of the humidity 
control zone". My input was based on the description provided in the 
I/O reference (Please confirm whether or not the latest I/O refrence 
is accurate on this).

The above modifications made no difference in the results. The 
minimum RH specified in the humidistat RH schedule has not been met. 
Inspection of the "eplusout.bnd" indicates that there is no 
humidifier in the system.

1) Is it possible to add a component such as a humidifier to an air 
system created using COMPACT:HVAC objects?

2) How is the signal from the Humidistat used by the "Setpoint 
Manager" or the "Humidifier"? I do not see a call/reference to the 
humidistat from either of these objects.

3)Do I need to add other objects besides those descibed above to 
simulate minimum humidity control? 

Please provide insight when you have a chance. Thank you for your 
valuable time. Will be happy to upload the model, if needed.


Merid 
 






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