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

Chiller performance output variables

asked 2015-03-12 16:09:53 -0500

hugopft's avatar

updated 2015-03-12 16:55:48 -0500

I would like to know an output variable to analyze the behavior of a chiller along the project day and also the thermal load which this chiller is responsible to attend (basically I want the thermal load of the building).

I know that EnergyPlus provides the nominal capacity of the chiller. The problem is that, they probably are doing some considerations before print this value in the results. This is why I am asking for an output variable which allow me understand how my chiller is really working during a piriod of time.

edit retag flag offensive close merge delete


@hugopft I edited your question to have a more succinct title. Feel free to adjust it, but a long title doesn't always get people's attention.

Neal Kruis's avatar Neal Kruis  ( 2015-03-12 16:54:33 -0500 )edit

Thanks Neal Kruis.

hugopft's avatar hugopft  ( 2015-03-13 07:42:48 -0500 )edit

1 Answer

Sort by ยป oldest newest most voted

answered 2015-03-12 16:51:19 -0500

updated 2015-03-12 17:00:03 -0500

Take a look at the section of the Input Output Reference that discusses chiller output. I think you are looking for Chiller Evaporator Cooling Rate and Plant Supply Side Cooling Demand Rate. These will tell you how much cooling is performed by the chiller and the actual demand load on the chilled water loop throughout the simulation.

edit flag offensive delete link more


@Neal Kruis I also would like to see these chiller outputs along with chiller run-time hours throughout the simulation. How do you use these "object" name inputs to see the outputs? Can you view these outputs in the results viewer of openstudio? As much detail as you can provide will be helpful as I'm new to energyplus & openstudio. Thanks.

Brian C's avatar Brian C  ( 2015-06-01 16:17:04 -0500 )edit

@Brian C You will have to create an OpenStudio measure to output these variables. Take a look at this site for an explanation of how to add an output variable using the reporting measure.

Neal Kruis's avatar Neal Kruis  ( 2015-06-01 16:27:16 -0500 )edit

@Neal Kruis Thanks, it worked as advertised. Can you see runtime for equipment? I do not see that object variable on bigladder's website

Brian C's avatar Brian C  ( 2015-06-01 16:45:49 -0500 )edit

@Brian C what do you mean by runtime? Do you want to total all of the timesteps when the chiller is running? You can look at the Part Load Ratio and count the timesteps when the value is not zero, but there is no dedicated output for runtime of a chiller.

Neal Kruis's avatar Neal Kruis  ( 2015-06-01 17:44:47 -0500 )edit

@Neal Kruis Yes, as you described. Thanks for the idea on that and help again.

Brian C's avatar Brian C  ( 2015-06-01 17:55:01 -0500 )edit

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: 2015-03-12 16:09:53 -0500

Seen: 265 times

Last updated: Mar 12 '15