# How does Energyplus calculate the End-use Electrical Consumption

I am using Bently"s Open Energy Simulator(which essentially uses energy plus for simulation) for my university project, and our professor has asked us to determine how the end-use electrical energy consumption varies monthly, but I have not been able to identify what parameters does the software uses to calculate the electrical consumption.

I would really appreciate your help.

Thank you

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1

Is your question "How are annual energy tallies (electricity, gas, etc.) broken down monthly, per end-use (heating, cooling, lighting, fans)"? If so, look up the Report: BUILDING ENERGY PERFORMANCE - ELECTRICITY (then one for gas, etc.) in the generated eplustbl.htm file. Is the question instead "How/when does EnergyPlus update/report output variables during a simulation", then a starting point would be the Time Marching Solution. Can you clarify?

( 2022-06-15 07:02:39 -0500 )edit

My question relates to the second one.

And maybe to add a bit of context, I modelled a building for my project, and I am considering the building to be naturally ventilated, so the energy consumption is mainly due to the interior lighting. Since my project requires me to determine how different seasons can affect the energy demand of a building, I need to be able to understand how the external environment is affecting the final results.

Thank you.

( 2022-06-15 12:52:11 -0500 )edit
1

Are you integrating daylighting controls (e.g. photocells) in your model, through Bentley's OpenBuildings? If not, seasonal variability in lighting could only come from YOUR own input schedules. Here, EnergyPlus applies your input wattage (& injected in a given zone) at each timestep (something you can easily track in the .eso file). The transient response (e.g. changes in air/surface temperatures) of your model due to lighting loads (and climate variables) is another story - the answer requires an understanding of EnergyPlus' core calculations (ref Engineering Reference Manual).

( 2022-06-15 16:18:46 -0500 )edit

Thank you for your help. I will go through them and see if it helps.

( 2022-06-18 04:29:02 -0500 )edit