[EnergyPlus_Support] Re: Overheating - New file uploaded to EnergyPlus_Support

["Michael J. Witte" <mjwitte@xxxxxxxx>]

This is a multiple-zone constant volume system with central DX cooling coil and 
electric reheat coils.  There are several issues here . . .

1.  The input file has multiple SET POINT MANAGER:SINGLE ZONE REHEAT objects 
(one for each controlled zone) which all place a setpoint on the same node.  
All but the last of these will be ignored, because they will each overwrite the 
previous setpoint in the order they are input.

2.  If the intent is to control the cooling coil to meet the most demanding 
zone cooling load, then use SET POINT MANAGER:WARMEST.  If the intent is to 
have one zone be the master zone, then use SET POINT MANAGER:SINGLE ZONE 
COOLING.  In either case, there should only be one set point manager placing a 
setpoint on the cooling coil control node.

3.  Nearly all of the EnergyPlus reheat terminal units currently control to 
meet the cooling setpoint if there is a cooling load and to meet the heating 
setpoint if there is a heating load.  So, if a zone has a small heating load, 
you will see reheat coil operation to temper the cold supply air to avoid 
cooling beyond the cooling setpoint.

Mike


On 7 Jul 2005, at 3:56, Yahoo! Groups Notification wrote:

> 
> Hello,
> 
> This email message is a notification to let you know that
> a file has been uploaded to the Files area of your EnergyPlus_Support 
> group.
> 
>   File        : /Problem_Submittals/Sam Roose/25_no_OA_temp_limits_V1_2_2.idf
>   Uploaded by : samroose2004 <sam@xxxxxxxxxxxxxxxxxxxxx> Description : Elec
>   heating coils and DX Cooling coil - heating on well above setpoint 
> 
> You can access the file at the URL:
> http://groups.yahoo.com/group/EnergyPlus_Support/files/Problem_Submittals/Sam%20
> Roose/25_no_OA_temp_limits_V1_2_2.idf 
> 
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx




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