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

Total cooling load in E+

asked 2017-11-26 21:27:26 -0500

finorths's avatar

updated 2017-11-27 06:20:50 -0500

How to calculate the total cooling load in EnergyPlus while the HVAC system is defined? What are the output variables required for the calculation of total cooling load? In my case, I take the output:variable "Cooling coil total cooling energy" as the total cooling load, is it correct?

edit retag flag offensive close merge delete


Make sure you use the search function, this question (or similar) has been asked before. Also, we have a convention to not include greetings (hi, thanks, etc). Thank you!

Julien Marrec's avatar Julien Marrec  ( 2017-11-27 06:21:49 -0500 )edit

Noted. I've searched the question, the most related answer is from you as in ( However, only the output:variables for the ideal load are provided. Can you give any suggestions on the calculation of total cooling load while a specific HVAC system designed in the model?

finorths's avatar finorths  ( 2017-11-29 01:24:06 -0500 )edit

Can you tell me what specific HVAC system you do have then?

Julien Marrec's avatar Julien Marrec  ( 2017-11-29 02:22:43 -0500 )edit

Sure, in my case the chilled water cooling coil is adopted in the AHU, chiller plant includes the water-cooled chiller and var spd cooling tower. Thanks.

finorths's avatar finorths  ( 2017-11-29 21:03:16 -0500 )edit

1 Answer

Sort by ยป oldest newest most voted

answered 2017-11-30 08:27:24 -0500

If your case, you can report at several levels, including:

  • Coil:Cooling:Water: Cooling Coil Total Cooling Rate [W]
  • AirLoopHVAC: Air System Total Cooling Energy [J] (The I/O doc doesn't mention a rate one, but maybe it's still there, check your .rdd file)
  • You could also report the Plant Loop's Plant Supply Side Cooling Demand Rate if the Chilled Water Plant Loop only serves the zones you're interested in.
  • You could also request specific Output:Meter. The documentation should help as well as the .mdd file, but I'm quite sure its been covered on this site too.

A note on the "Cooling Coil Total Cooling Energy" or "Rate", since you mentioned it in your question: beware of simultaneous heating and cooling though. This will report the energy used by the coil, but if you have central heating or terminal reheat down the line, you'd effectively be providing less "actual" cooling energy.

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


Question Tools


Asked: 2017-11-26 21:27:26 -0500

Seen: 542 times

Last updated: Nov 30 '17