Re: [EnergyPlus_Support] Electric v/s Hot Gas Reheat

[Don Shirey <shirey@xxxxxxxxxxxx>]

Merid,

As explained in the documentation, the maximum amount of heat reclaim 
for the COIL:Desuperheater:Heating is 30% of the total heat rejection. 
For your simulation, this must not be sufficient..... particularly at 
part-load conditions.  Yes, this could be real.  Did you compare the 
maximum heating capacity of your electric reheat coil to the maximum 
heat provided by your COIL:Desuperheater:Heating object?  No, there are 
no other aspects of the model that need to be modified.

UNITARYSYSTEM:HEATPUMP:AIRTOAIR and UnitarySystem:HeatPump:WaterToAir 
currently allow the user to specify both Blow through or Draw through 
fan arrangements. We intend to add draw thru configuration to the 
Unitary HeatCool systems in a future release (Oct 2006 or April 2007 
depending on scheduling).

Don

aboyemeplus wrote:

>Hi All,
>
>I am modeling a unitary system (type:Furnace:BlowThru:HeatCool)with 
>the high humidity control activated.
>First, I run the model with a Hot Gas Reheat Coil, then with an 
>electric reheat coil. The rest of the model remained unchanged. The 
>results from the simualtion using the electric reheat coil show that 
>zone temperature and humidity are tightly controlled. On the other 
>hand, the Hot Gas reheat simulation resulted in significant zone 
>temperature deviations from the cooling setpoint (zone is cooled as 
>much as 7 oF lower that setpoint temperature, to maintain desired 
>max humidity). This, in turn, required a much high system cooling 
>capacity. 
>
>Is this real? If not, are there any other aspects of the model that 
>need to be modified depending on which reheat coil type is used? 
>
>Also, are there any Unitary System Objects in EnergyPlus that 
>support a Draw thru configuartion for cooling and BlowThru for 
>heating?
>
>Your help is much appreciated.
>
>Merid 
>
>
>
>
>
>The primary EnergyPlus web site is found at:
>http://www.energyplus.gov
>
>The group web site is:
>http://groups.yahoo.com/group/EnergyPlus_Support/
>
>Attachments are not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.
>
>EnergyPlus Documentation is searchable.  Open EPlusMainMenu.idf and press the "search" button.
> 
>Yahoo! Groups Links
>
>
>
>  
>




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