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Economizer high limit doesn't work

asked 2021-05-08 15:54:40 -0600

Jim Dirkes
3544 ●27 ●16

updated 2021-05-17 14:38:19 -0600

__AmirRoth__

4436 ●5 ●17 http://bleedinggreenna...

I don't normally have secondary limit on differential enthalpy economizers, but this model actually has two - an enthalpy value and a dewpoint. Setup seems simple, but it's not working.... EnergyPlus setup is:

image description

Results are:

image description

Insights, please!

ps, For the series of values shown, outdoor temp is ~29c, RH ~60%. Zone temp & RH are shown in the image (~20C, = 60%RH)

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answered 2021-05-09 18:28:15 -0600

Jim Dirkes
3544 ●27 ●16

I think the "High Humidity Control" was confusing things. I turned it off an now results are much improved.

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Jim, another setting to watch out for is in the DesignSpecification:OutdoorAir object. Unless otherwise defined, E+ is using a default value for the outdoor_air_flow_per_person parameter, which can cause unexpected OA flow behavior if that value exceeds your min OA flow rate.

codybond ( 2021-05-10 09:17:02 -0600 )edit

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Asked: 2021-05-08 15:54:40 -0600

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Last updated: May 09 '21

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Economizer high limit doesn't work edit