Re: [EnergyPlus_Support] Baseline Fan Flow/W Error

["Jim Dirkes jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>]

Dear Javed,

There is a big difference between what you think is the flow/W ratio (4.07 x 10^-5) and what E+ is seeing (1.46 x 10^-5).  What is causing that difference?

I suspect that this coil is operating at reduced fan flow while trying to provide full capacity at startup (your error message shows the first hour of the DesignDay)./

There are no single speed coils of this capacity for VAV systems in real life for that reason, so I think it may be better to model it as a multi-speed coil.

On Sat, Sep 5, 2015 at 3:43 PM, Javed Iqbal eee.javed@xxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

 

Dear All,

I am getting following warnings though m3/s/W is in the proscribed limit. For instance VAV Sys 1 has m3/s/W of 4.07X10^-5 which is within the range but still getting following repetitive warning. I would appreciate any help on this.  

 ** Warning ** CalcDoe2DXCoil: Coil:Cooling:DX:SingleSpeed="VAV SYS 1 COOLING COIL" - Air volume flow rate per watt of rated total cooling capacity is out of range at 1.465E-005 m3/s/W.

   **   ~~~   **  Environment=SUMMER DESIGN DAY IN UNTITLED, at Simulation time=03/31 00:00 - 00:30

   **   ~~~   ** Expected range for VolumeFlowPerRatedTotalCapacity=[2.684E-005--6.713E-005]

   **   ~~~   ** Possible causes include inconsistent air flow rates in system components,

   **   ~~~   ** or variable air volume [VAV] system using incorrect coil type.

--

Javed Iqbal, LEED AP, CEA

Sr. Energy Analyst 

--

James V Dirkes II, PE, BEMP, LEED AP
CEO/President
The Building Performance Team Inc.
1631 Acacia Dr, GR, Mi 49504

Direct: 616.450.8653
jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx

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The body must be given a little less than it needs. Otherwise it will turn traitor.

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Posted by: Jim Dirkes <jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx>

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