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How do I get Energy plus to Output latent loads and total loads

asked 2020-09-22 20:53:23 -0500

Ricky9 gravatar image

updated 2020-09-23 16:13:04 -0500

I have seen this question before, but the answers were not very helpful. Calculation of the total cooling load which is the sum of the latent and sensible cooling loads, is essential to the accuracy of the building energy use calculation. Why is this not a default in energy plus as it is with other building energy modelling and HVAC softwares?

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answered 2020-10-20 12:21:18 -0500

Jmythms gravatar image


I'm just summing up the answers mentioned here about cooling loads and here about ideal air load systems.

To output the loads, you have to go through two steps:

  1. Add an Ideal Air Loads system to your Energyplus input file (.idf file) : You could do this using Openstudio. Another way is to use the built in IDF editor that comes with EnergyPlus for Windows. One more (might be complicated for new users) way to do this by just using a text editor like Atom/Notepad++ is mentioned here.
  2. Add the following lines to your Energyplus input file (.idf file) using a text editor like Atom/Notepad++:

    HVAC,Average,Zone Ideal Loads Zone Sensible Cooling Rate [W]

    HVAC,Average,Zone Ideal Loads Zone Latent Cooling Rate [W]

    HVAC,Average,Zone Ideal Loads Zone Total Cooling Rate [W]

Run Energyplus after doing this and you would see the cooling loads in your generated results (the csv file that is generated or the .eso file).

Regarding why this output is not automatically generated: it is an output that is not useful for everyone using EnergyPlus. Forcing this output to be generated every time would make EnergyPlus slower for users who do not need these numbers.

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Asked: 2020-09-22 20:53:23 -0500

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Last updated: Oct 20 '20