Re: [EnergyPlus_Support] Split-air conditioning system

[Energy Partners <energy.partners@xxxxxxxxx>]

Dear James,

The room is simulated in a place with cold climate and the minimum temperature goes down to 9degree. 

The system is autosized so why E+ doesn't size the system bigger to keep the room warm?

Thanks.

Regards

Chun

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From: Jim Dirkes <jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Monday, 15 August 2011 8:58 PM
Subject: RE: [EnergyPlus_Support] Split-air conditioning system

 

It sounds like you DID disable the supplemental heating!

·         No gas consumption

·         Not enough heating during an additional 150 hours

 

Perhaps the model is showing you the actual results of a colder room.

 

Consider adding a report variable for the room temperature in order to see how cold the room becomes.

 

The Building Performance Team
James V. Dirkes II, P.E., BEMP , LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653

 

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of energy.partners
Sent: Monday, August 15, 2011 2:47 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Split-air conditioning system

 

 

Hi,

I am trying to set up a split-air conditioning system (DX single speed cooling, DX single speed heating and Air-to-air Heat pump). The size of the system is autosized. I have also set up gas heating as the supplemental heating. In reality some split systems don't have supplemental heating. I have tried to "turn off" this function by input the "Maximum Outdoor Dry-Bulb Temperature for Supplemental Heating" (under AirLoopHVAC:UnitaryHeatPump:AirToAir)to -10 degree. The gas heating consumption drop to zero but the "Time Set Point Not Met During Occupied Heating" increase from 50 to 230 hours which would be unacceptable. Could anyone give me some advice on how to disable the supplemental heating?

Thank you very much.

Regards.

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