Question-and-Answer Resource for the Building Energy Modeling Community
Get started with the Help page
Ask Your Question

Can EnergyPlus accurately model VRF systems?

asked 2015-08-19 18:16:29 -0500

Sherry's avatar

updated 2015-08-19 18:30:06 -0500

We did a study and compared different modeling tools.

We found EnergyPlus has the most lab and field test data demonstrating the accuracy of the module. It also is able to model Heat Recovery VRF systems and it is able to model multiple HVAC systems per thermal zone. Therefore, EnergyPlus is able to model all of the common VRF installations in commercial buildings.

We want to hear your comments.

References EPRI (forthcoming), PG&E Emerging Technology study of a variable refrigerant flow system installed at the PG&E service office in Auburn, CA. Hwang, Yunho, et al. "Field Performance Measurements of VRF System with Subcooling Heat Exchanger." Purdue E-pubs. University of Purdue, 2012. Web. Aug. 2014. Raustad, Richard. Domitrovic, Ron, et al. “Technical Subtopic 2.1: Modeling Variable Refrigerant Flow Heat Pump and Heat Recovery Equipment in EnergyPlus” Sept. 2013. Web. Aug. 2014

edit retag flag offensive close merge delete

1 Answer

Sort by » oldest newest most voted

answered 2015-08-20 04:38:15 -0500

Jim Dirkes's avatar

When you say "accurately model", it sounds as though you're asking for real world validation. I don't have that. I have, however, recently compared single curve representations of VRF, such as are used by some modeling software, against the E+ "segmented" multi-curve approach. It sure looks like there are hundreds of hours in most climates (near the curve transition points) where the E+ approach matches manufacturer performance much better. In case it might be helpful, there's an upcoming webinar sponsored by DesignBuilder (which I'm helping to present) that will promote DB's capabilities for VRF but will also show some of the curve differences between E+ and single-curve approaches.

edit flag offensive delete link more

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

Question Tools

1 follower


Asked: 2015-08-19 18:16:29 -0500

Seen: 514 times

Last updated: Aug 20 '15