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How to get hourly heating and cooling loads(sensible and latent) on EnergyPlus simulation?

asked 2019-09-25 03:42:48 -0600

srisankethu's avatar

I need the hourly heating and cooling load values(sensible and latent) on running EnergyPlus simulation on a building.

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answered 2019-09-25 09:35:42 -0600

The reporting availability is shown in the rdd file after you run a simulation. The zone loads can be seen (if you have a thermostat and/or humidistat) by including any of these in your input file. The reporting frequency (in this case hourly) can be changed to any of detailed, timestep, hourly, daily, monthly, runperiod or annual. See Input Output Reference document on Output:Variable for more details.

Output:Variable,*,Zone Predicted Sensible Load to Setpoint Heat Transfer Rate,hourly;
Output:Variable,*,Zone Predicted Sensible Load to Heating Setpoint Heat Transfer Rate,hourly;
Output:Variable,*,Zone Predicted Sensible Load to Cooling Setpoint Heat Transfer Rate,hourly;
Output:Variable,*,Zone Predicted Moisture Load Moisture Transfer Rate,hourly;
Output:Variable,*,Zone Predicted Moisture Load to Humidifying Setpoint Moisture Transfer Rate,hourly;
Output:Variable,*,Zone Predicted Moisture Load to Dehumidifying Setpoint Moisture Transfer Rate,hourly;
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I have a followup question, that is a bit more general. How would one "include" these outputs? I've tried using the IDF editor to add output variable objects, but this always leads to "fatal errors" when re-running the simulation. I'm using the IDF files for different building types developed by the DOE (reference buildings), and am trying to get the hourly sensible and latent building loads, which are not part of the default report. Thanks for any advice you can give!

fixa's avatar fixa  ( 2020-05-13 12:47:58 -0600 )edit

Open the idf in a text editor (e.g., NotePad, WordPad, etc.). Open the rdd file in a text editor. If the format of the rdd variables do not look like what I show above, add Output:VariableDictionary, IDF; to your input file and run it again and then open the rdd in a text editor. Then just copy and past from the rdd to the idf. Then run it again. Once you do this a few times I imagine you will also be able to do this in the idf editor.

rraustad's avatar rraustad  ( 2020-05-13 14:39:11 -0600 )edit

Using your suggestions, I was able to successfully get the variables I was looking for to show up in the output variables drop down. I added the two hourly output variables I was interested in using the IDF editor, ran the simulation again, but not I'm not sure where to find the hourly values I was looking for. They don't appear in the HTML report. Thanks!

fixa's avatar fixa  ( 2020-05-14 14:27:58 -0600 )edit

Output variables are shown in the csv file, eplusout.csv or Filename.csv

rraustad's avatar rraustad  ( 2020-05-18 12:34:49 -0600 )edit

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Asked: 2019-09-25 03:42:48 -0600

Seen: 1,223 times

Last updated: Sep 25 '19