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[EnergyPlus_Support] Re: AHU with a DX coil and variable air flow

Hello,

In the real system i have a VRV heat pump connected to a coil in the AHU. I don't know which is the best way to simulate this system in E+, especially with the variable air flow rate.

Thanks for your help.


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Edward G. Lyon" <eglyon@...> wrote:
>
> I don't know if the Energy+ software/equipment will do this, but practically DX equipment has a narrower constraint on airflow variations.  If your flow goes outside the boundaries of what the equipment is designed for, you risk either coil freezing or compressor overloads/damage. E+ will give you warnings about these deviations.  Variable airflow systems typically use fluid coils as that configuration is more easily controlled without equipment risks.
> 
> Ned Lyon, P.E. (MA)
> Staff Consultant
> SIMPSON GUMPERTZ & HEGER
> 781.907.9000 main
> 781.907.9350 direct
> 781.907.9009 fax
> www.sgh.com
> 
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of joao.rosa83
> Sent: Thursday, May 03, 2012 11:49 AM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] AHU with a DXcoil and variable air flow
> 
> 
> 
> Hello,
> 
> I'm trying to setup an AHU 100% Outside air with a DX coil and a variable air flow rate?
> 
> It is possible to use de unitary equipment "AirLoopHVAC:UnitaryHeatPumpAirToAir" with a Fan: VariableVolume ? I'm using the "AirLoopHVAC:UnitaryHeatPumpAirToAir" with a Fan:CostantVolume with Coils:DX:SingleSpeed and a AirTerminal:SingleDuct:VAV:HeatAndCool:NoReheat, but the OA remains constant.
> 
> The goal is to have a constant temperature at the exit of the AHU and change the mass flow according to the zones internal loads and the zone setpoint temperature.
> 
> Thanks for your help
> João
>




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