RE: [EnergyPlus_Support] HVAC loop Controls - Need help

["Griffith, Brent" <brent.griffith@xxxxxxxx>]

The program will accept such input and try to run.  But this input is not going to work very well and will lead to the coils fighting each other if those schedules are constant 12C and 35C.   The cooling coil will open up water flow to try and hit 12C while the heating coil will open up flow to try and hit 35C.  The two controllers operate independently of each other.  Unless you want to model a fault, or have some clever variations in the schedules, this input is not going to work well.  Further there aren?t really air terminal models that are set up to switch between 12C and 35C deck temperatures and still control the zone.



The cooling coil controller would work better if the sensor is at the outlet of the cooling coil instead of downstream.  With the heating coil located in between the cooling coil and its sensor, it will have difficulties to make setpoint whenever the heating coil is on.   



From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Santiago Velez
Sent: Monday, May 06, 2013 7:32 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] HVAC loop Controls - Need help





Dear group, I have some doubts about how HVAC loops controls work. I've modeled an AHU with cooling and heating water coils (Branch and controller object below). I was wondering how to set setpointmanager objects to control water coils so that supply air temperature is 12 C when cooling and 35 C when heating. I now how to do this with zone reheat coils, but I want to make sure I understand how control work.



Is it ok to set 2 Setpointmanagers objects, one for cooling and one heating,  that set different temperatures to different nodes, (eg.  
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