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Is There a Way to Speedacceleratings Simulations?

asked 2023-07-03 19:40:55 -0500

eoinfwepi's avatar

I am running EnergyPlus simulations, but they seem to be running slower than I expected. The simulation time is significantly extended due to the vast number of pipe networks in my photovoltaic panels and horizontal ground heat exchangers. I know that for coding languages like Python, one can reduce computational time by using multithreading or utilizing the GPU. Does EnergyPlus not have such capabilities?

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answered 2023-07-04 10:44:27 -0500

You can run multiple simulations in parallel, but you cannot parallelize a single simulation, due to the nature of what's happening (all calculations must happen in a defined order).

You could break up your simulation in 12 monthly runperiods and collate the results after the fact, loosing a bit in accuracy though. This has been discussed for eg here: and if my memory serves, this is something that JEplus / JESS client does for you.

Shading calculations can be run on the GPU. See

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Your memory is correct, Julien! You can try it out using the web portal here (!/new) after creating an account yourself and then requesting JESS access.

Yi Zhang's avatar Yi Zhang  ( 2023-07-05 06:57:18 -0500 )edit

answered 2023-07-04 14:21:46 -0500

You also may want to take a look at the PerformancePrecisionTradeoffs object. The documentation for it is here

I would encourage you to try different options when running a short time period and see the impact on energy consumption. After you have gained confidence, run the entire year using those options.

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Asked: 2023-07-03 19:40:55 -0500

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Last updated: Jul 04 '23