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Re: [EnergyPlus_Support] Temperature and humidity setpoints

You can add an air-loop system to serve the same zones that are being served by 
the radiant panels.  By adding dehumdification controls, the air system can 
control for humidity (cooling priority 1 in the zone equipment list) and the 
radiant panels can pick up the remaining sensible load (cooling priority 2).  

If you already have an air system described and want to add humidity controls, 
see exmple file 5ZoneWaterCooled_HighRHControl.idf (chilled water system) or 
FurnaceWithDXSystemRHcontrol.idf (DX system).

If you have not already set up the air system description, the quickest way to 
would be to use COMPACT HVAC unitary or VAV objects.  Get the updated COMPACT 
HVAC interim release from the yahoo group files area 
(CompactHVACInterimUpdateV2-0-0.zip in the Updates folder).  This update 
includes humidity control options on the VAV and unitary system types.  If you 
add this to your idf which already contains the radiant system, the run will 
fail, because COMPACT HVAC will create duplicate instances of CONTROLLED ZONE 
EQUIPMENT and ZONE EQUIPMENT LIST.  Take the expidf output file and edit it to 
merge these objects for the two systems.

Mike


On 14 Sep 2007 at 7:35, lorenzomattarolo wrote:

> Dear E+ support,
> 
> I'm analysing an office building.
> The temperature of the office is controlled by a radiant system with
> panels on the ceiling.
> Besides an air system supplies primary air at a temperature of 16°C
> and at variable humidity. It varies the content of humidity according
> to a setpoint of 50% H.R. inside the office.
> 
> I'm modelling this office with E+ by a system with radiant panels
> which control the temperature of the zone 
> (by means of "zone control thermostatic" with "heating/cooling single
> setpoint")
> 
> How can I model this air system?
> Is there a way to control the temperature of the zone by the radiant
> system and the humidity of the zone by an air system?
> 
> Many thanks,
> 
> Lorenzo

========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx





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