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How to Report EFLH for schedules in Open Studio?

asked 2019-08-13 12:22:34 -0500

nsimhai gravatar image

updated 2019-08-13 13:58:15 -0500

Is there a way to output the equivalent full load hours for a given fractional or on/off schedule, or is there some location in OS that displays this value?

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answered 2019-08-14 09:11:31 -0500

pow_skier gravatar image

Use the custom reporting measure to edit a sql query from the Energy Meters EPlus table of whichever end use you are looking for.

EFLH = Annual / Max

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Thanks, this is a helpful measure I didn't know about, and could be useful for other things as well. Is there some more information on what methods are required to get the different model outputs - e.g. whether to get it from the model as in "" or from the SQL file or from the SQL tabular data?

nsimhai gravatar imagensimhai ( 2019-08-14 11:12:13 -0500 )edit

In a reporting measure you will most likely be using the SQL output file as well as the energy plus table data. Both are accessible via queries accompanied with the .execAndReturn methods to the sqlFile object that is already set up for you in the template!

ParticleSwarm gravatar imageParticleSwarm ( 2019-08-15 12:04:12 -0500 )edit

answered 2019-08-14 06:58:18 -0500

I usually calculate the equivalent full load hours based on the resulting energy use of the equipment associated with the fractional or on/off schedule. The calculation is EFLHs = annual energy use / peak energy demand.

An example would be a light fixture with input power of 1 kW that has an annual energy use of 1,126 kWh and a peak energy demand of 0.9 kW. The calculated EFLHs of the schedule assigned to this light fixture would be 1,251.1 hours/year. Note that you use the peak demand and not the input power. If the peak demand is less than the input power, that means that the schedule doesn't include an hour with a fractional value of 1.0.

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Asked: 2019-08-13 12:22:34 -0500

Seen: 200 times

Last updated: Aug 14 '19