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[EnergyPlus_Support] Re: Variable Volume Refrigerant System

The EnergyPlus team is working to make it able to simuulate VRV o

--- In Energylus_Support@xxxxxxxxxxxxxxx, "James V Dirkes II, PE" <jvd2pe@...> wrote:
> Dear Mário,
> I'm currently working on a VRF system and am modeling it this way:
> ·         The actual system uses Mitsubishi City Multi VRF units with heat
> recovery capability.  I am not sure if this approach will work for other
> manufacturers of VRF systems.
> ·         My model uses water source heat pumps (WSHP) for each zone. These
> should capture the ability of the VRF system to "shift" energy around when
> some zones are heating while others are cooling.  The model is running
> without error, but I have not addressed the details of the energy portion
> yet.  That part will go similar to the following?
> o   The WSHP fans will be assigned power (efficiency and pressure rise) to
> match the VRF fans.
> o   The WSHP heating and cooling coils will have a "simple" power
> consumption coefficient.  If I can use 0 power, that will be best, since the
> VRFs don't use power at each zone except for the fans.  If I can't use 0 due
> to some E+ restriction, I'll probably make it equivalent to a COP as high as
> possible and then report that energy in a Custom Meter and use a Custom
> Decrement Meter  so it can be removed from the total electricity use.
> o   The WSHPs have a gas boiler with efficiency of 1.0 for supplemental heat
> and an electric chiller with COP of 1.0 for supplemental cooling.  The 1.0
> efficiency / COP values are used for simplicity so that energy used by the
> boiler and chiller is essentially the same as the load.
> o   I will report the boiler and chiller energy and "post-process" their
> energy using the manufacturer's part load efficiency equation.  It occurs to
> me just now that I may be able to apply curve values which mimic the
> manufacture part load performance and avoid the post processing?.
> The Building Performance Team
> James V. Dirkes II, P.E., LEED AP
> 1631 Acacia Drive NW
> Grand Rapids, MI 49504
> 616 450 8653
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx
> [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Mário
> Sent: Sunday, May 16, 2010 4:12 PM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] Variable Volume Refrigerant System
> Hello 
> Does anyone have any ideas on how to model a variable volume refrigerant
> system, like a VRV or VRF system in which you have one exterior machine
> linked to vários interior terminal machines?
> Thank´s
> MN


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