Re: [EnergyPlus_Support] VRF air conditioning system performance curve

[Jeremiah Crossett <jcrossett@xxxxxxxxxxxxxxx>]

Jim,

This tool is much more comprehensible with your charts- With your visualisations the user can tell if they are within reason!  Have you thought of submitting this to to the E+ team to replace the original version?

Jeremiah D. Crossett  | Senior Analyst  |  Phase Change Energy Solutions

120 E. Pritchard St.  | Asheboro, NC 27203  | Mobile 503-688-8951

www.phasechange.com 

  

On Sat, Oct 13, 2012 at 4:27 AM, Jim Dirkes <jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

 

This can be a complex topic!

I have attached a tool which Is available on the Help Desk site. This may be helpful for you

p.s., The last worksheet is of my own making as a means of visualizing the curves.

 

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

 

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of soohyeunyang
Sent: Saturday, October 13, 2012 6:06 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] VRF air conditioning system performance curve

 

 

I have a question about performance curve.
I have constructed the VRF air conditioning system using VRF example file(version 7.0)
Cooling(Heating) Capacity Ratio modifier Function of Temperature Curve, Cooling(Heating) Capacity Modifier Curve Function of Flow Fraction, Cooling(Heating) Capacity Ratio Modifier Function of Low(High) Temperature Curve, Cooling(Heating) Capacity Ratio Boundary Curve, and etc. shoud be entered in IDF file.
But, I don't know exactly how the coefficient constant, coefficient x, coefficient x**2, coefficient y, coefficient y**2, coefficient x*y values in Peformance Curves are decided.
I have refered to the "EngineeringReferences".
For example, the equation in connection with DX cooling coil capacity coefficents are decided using a regression analysis. At this point, a regression analysis uses the entering wet-bulb temperature, outdoor dry-bulb Temperature and total cooling capacity. I am wondering how i know these values and selection criteria. And does a regression analysis conduct using E+?
Please give me tips.
Thank you.

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