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Re: [EnergyPlus_Support] Simulating VRV/VRF systems

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Simulating VRV/VRF systems
From: Linda Lawrie <linda@xxxxxxxxxxxxxx>
Date: Wed, 20 Jul 2011 16:15:56 -0600
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Because the V6.0.0.037 release contains the VRF model we've been working on.

Here was our knowledge base article before the model was completed:
Update 1/22/2010: The VRV/VRF model is scheduled to be added to E+ near the end of 2010/beginning of 2011.

The VRV (or VRF) model is not yet included as an equipment type in EnergyPlus and may be added in the future. Heat recovery for VRV systems will not be added until a later date when manufacturers provide sufficient data to develop a model for this performance aspect of VRV systems. Simulating a VRV system with the existing VAV model will only provide valid information when cooling is required. The results will only be as good as the DX cooling coil performance curves allow. The heating side of a VAV system does not use a DX compression system (i.e., uses gas or electric heat) so this part of the VRV system can not be modeled with a VAV system. The air-to-air heat pump model is the closest available model and will provide information for cooling-only or heating-only operation (VRV heat pump mode). Again, VRV heat recovery mode can not be simulated at this time.

At 04:11 PM 7/20/2011, Vinay Devanathan wrote:

Hello All,

I have come across the PVVT modeling approach as a workaround for simulating VRV/VRF Systems in eQuest.

I was wondering why the workaround of using Water-source Heat Pumps to mimic a VRV/VRF system has not been proposed as yet.

Any explanation/reasoning would be much appreciated.

Thank you.

Vinay

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References:
- [Bldg-sim] Simulating VRV/VRF systems
  - From: Vinay Devanathan

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