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OpenStudio Results - Plant Loop Details correct?

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

Matt Koch's avatar

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


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?


Matt Koch

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

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

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Not fast enough for @Eric Ringold!

MatthewSteen's avatar MatthewSteen  ( 2016-04-28 09:52:10 -0500 )edit

answered 2016-04-28 09:30:57 -0500

updated 2016-04-28 09:32:41 -0500

The OpenStudio report is wrong. It appears to be getting the ratedFlowRate and reporting it as 'Rated Power Consumption' in W (here).

@David Goldwasser can you check the whole PumpVariableSpeed section? There seems to be other stuff off as well (e.g. value_source_units).

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Thanks @Matt Koch, @Eric Ringold, and @MatthewSteen. I'll try to look at both this and the Exterior lighting this afternoon.

David Goldwasser's avatar David Goldwasser  ( 2016-04-28 09:45:19 -0500 )edit

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

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Last updated: Apr 28 '16