Question-and-Answer Resource for the Building Energy Modeling Community
Get started with the Help page
Ask Your Question
5

Heat Rejection by VRF Condensing Unit

asked 2016-12-20 10:45:55 -0500

Ladan's avatar

updated 2017-01-25 00:50:14 -0500

I am modeling an HVAC system, where my rejected heat by VRF condensing unit is used/recovered for heating domestic hot water. Do you know how I can get an hourly output of my VRF rejected heat in Energyplus?

edit retag flag offensive close merge delete

2 Answers

Sort by ยป oldest newest most voted
3

answered 2016-12-22 06:03:33 -0500

Jim Dirkes's avatar

I think the answer that will serve you best is to review the .rdd (text) file after a successful simulation. It contains all of the Output:variables which apply to your simulation. Search for VRF-related variables and try them out. The .RDD file is invaluable, as are output:variables, for understanding results.

edit flag offensive delete link more

Comments

Thanks for your help. The problem is that I do not see that output in my current settings for VRF.

Ladan's avatar Ladan  ( 2016-12-23 16:53:21 -0500 )edit

When you say "do not see that output", do you meant that you have opened the .RDD text file and cannot find any reference to VRF? Each time E+ runs successfully, an .RDD file is created. The name is yourfilename.RDD and it will be in the same folder as all of your other output.

If you are still having difficulty after checking that file, please attach your .IDF file.

Jim Dirkes's avatar Jim Dirkes  ( 2016-12-24 04:38:26 -0500 )edit
0

answered 2017-06-07 15:13:01 -0500

If you have created your water-cooled VRF system correctly by setting the AirConditioner:VariableRefrigerantFlow object's Condenser Type input field set to WaterCooled, and created a PlantLoop object to represent the domestic hot water system using the rejected heat, then you should be able to generate an output variable named VRF Heat Pump Condenser Heat Transfer Rate. This should add a column to your output CSV file to show the Watts of heat transfer that occurs between the refrigerant and the condenser water loop (in this case, your domestic hot water system).

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

Training Workshops

Careers

Question Tools

Stats

Asked: 2016-12-20 10:45:55 -0500

Seen: 824 times

Last updated: Jun 07 '17