OpenStudio Results - Plant Loop Details correct?

asked 2016-04-28 07:32:36 -0500

Matt Koch
1998 ●2 ●17

updated 2016-04-28 09:25:15 -0500

MatthewSteen

10077 ●18 ●25 https://www.nrel.gov/b...

Hi,

I am running a simple single chiller, single air handler simulation. I noticed that in OpenStudio Results under Plant Loops Detail for my "CH-1 Loop" under OS:Pump:VariableSpeed, 215 gal/min are reported for Object, Sizing and Sizing Units, which is correct. However, under Description, Value and Value Units, there are Rated Power Consumption and 215 W. This is not correct, as the rated power consumption on this pump (as also entered in the HVAC Systems tab) is 4,120.57 W. Is OpenStudio just reporting this wrongly, or is it using it wrongly as well?

Thanks,

Matt Koch

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answered 2016-04-28 09:38:13 -0500

MatthewSteen

10077 ●18 ●25 https://www.nrel.gov/b...

The OpenStudio Results are produced by a measure that gets values from the EnergyPlus results, so check there for the real values, specifically the Pumps table in the Equipment Summary report.

It looks like the measure is using the ratedFlowRate method here and here instead of the ratedPowerConsumption method. It also looks like the source_units and target_units variables are incorrect.

FYI @David Goldwasser