Variable Speed Fan (AHU)

asked 2015-11-25 12:58:01 -0500

tajjmann gravatar image

updated 2015-12-01 07:16:17 -0500

I developed a model with Packaged Terminal Heat Pump Air Loop with a Variable Speed Fan (Air Handler Unit). However, the model gives constant hourly fan energy values and this does not match the actual data. How do I get the fan energy to vary. image description

Attached is the hourly energy consumption of the measure and simulated model.

image description


Here is the link to the OpenStudio Model

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Are you sure that you are looking at the output variable from the correct fan? I noticed that you have a second fan on the OA intake.

aparker gravatar imageaparker ( 2015-11-25 15:56:08 -0500 )edit

(Side note: shouldn't the fan on the OA be turned upside down graphically?)

Julien Marrec gravatar imageJulien Marrec ( 2015-11-26 02:55:56 -0500 )edit

@aparker the other fan on the OA intake is an ERV system and am very sure of the output variable @Julien Marrec

tajjmann gravatar imagetajjmann ( 2015-11-26 12:59:11 -0500 )edit

@tajjmann: this is not what I meant. I just meant that graphically openstudio should probably display the fan differently, i.e. flipped so that, like your supply fan, the blade is after the box. This doesn't affect what's really being modeled by EnergyPlus

Julien Marrec gravatar imageJulien Marrec ( 2015-11-27 02:50:51 -0500 )edit

As far as troubleshooting, it would help to have your openstudio model itself if you can share it.

Julien Marrec gravatar imageJulien Marrec ( 2015-11-27 02:52:10 -0500 )edit