[Bldg-sim] VRF in EE4 workaround

[Jim Dirkes]

Dear Juan,
I am not an EE$ user, but the approach below is one I used in EnergyPlus before it could model VRF.  It may help you...

*         VRF with heat recovery:  A water source heat pump system does exactly the same functions as heat recovery VRF systems, but uses different equipment.  To model the VRF:
o   Assign fan power to match the VRF fan power
o   We'll want all of the actual power use to be reflected at the System level, not zone level, so define the WSHP compressor with a COP of 10,000.  That results in compressor power = load.
o   The WSHP plant loop will have a Boiler and Chiller, and only one or the other will operate to meet the loop needs, just like VRF.  Since neither of these have part load performance similar to the VRF outdoor unit, we want to make their energy use reflect loads only, and that requires boiler efficiency = 1.00 and chiller COP = 10,000.  (Note: This could also be accomplished using District heating and cooling)
o   After reporting the energy use for the boiler and chiller using  Meter:Custom, apply the proper VRF part load factors in a post-process calculation.


James V Dirkes II, PE, BEMP, LEED AP
www.buildingperformanceteam.com<http://www.buildingperformanceteam.com/>
Energy Analysis, Commissioning & Training Services
1631 Acacia Drive, Grand Rapids, MI 49504 USA
616 450 8653

From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Sebastian Carrizo
Sent: Tuesday, November 05, 2013 7:39 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] VRF in EE4 workaround

Hello forum users,

I need to model a VRF system in EE4, I have read that there is no direct way to do it so I was wondering whether anyone knew of a workaround/other method to asses the energy performance of such a system.

Thanks in advance
[https://mail.google.com/mail/u/1/images/cleardot.gif]

--
Juan Sebastian Carrizo
M.Eng Sustainable Energy | B.Eng Industrial Engineering
(c) 647-225-2243 | juan.carrizo at alumni.carleton.ca<mailto:juan.carrizo at alumni.carleton.ca>


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