[Bldg-sim] VRF with humidity control DOAS

Jeremiah Crossett jcrossett at phasechange.com
Sun Jun 15 22:15:20 PDT 2014

I think this may be a better question for the Energy Plus list.

 * ​​Jeremiah D. Crossett ** | Senior Analyst  **| **LEED Green Associate *
*​​120 E. Pritchard St.  | Asheboro, NC 27203  ​​ |
Mobile 503-688-8951www.phasechange.com <http://www.phasechange.com/>  *

On Sun, Jun 15, 2014 at 10:03 PM, Sanket Puranik <sanketpuranik at gmail.com>

> Hi,
> I have modeled VRF system but I am getting high humidity for several hours
> in an year so I have implemented DOAS system  with humidity control. I took
> reference of "DOASDXCOIL_wADPBFMethod.idf" for adding DOAS to control
> humidity.
> The humidity problem has not been solved and I am getting same RH values
> as before adding DOAS. What can be the problem with the system?
> I am getting following warnings:
> 1) "CalcDoe2DXCoil: Coil:Cooling:DX:TwoStageWithHumidityControlMode="OA
> COOLING COIL" - Air volume flow rate per watt of rated total cooling
> capacity is out of range"
> 2) "CalcDoe2DXCoil: Coil:Cooling:DX:TwoStageWithHumidityControlMode="OA
> COOLING COIL" - Full load outlet temperature indicates a possibility of
> frost/freeze error continues."
> One more interesting thing I have observed is that VRF system is using
> double the electricity for cooling for the same building as compared to VAV
> system!! VRF system is supposed to be more energy efficient than VAV
> system??
> Also I have modeled chilled beam system where I am again facing problems
> of high humidity. I am planning to use  same type of DOAS as in the example
> file mentioned above. Is it a good way or should I refer to other example
> file which would be more appropriate?
> Kind Regards,
> Sanket
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