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Economizer high limit doesn't work

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:

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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)

Jim Dirkes's avatar
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Jim Dirkes
asked 2021-05-08 15:54:40 -0500
__AmirRoth__'s avatar
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__AmirRoth__
updated 2021-05-17 14:38:19 -0500
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I think the "High Humidity Control" was confusing things. I turned it off an now results are much improved.

Jim Dirkes's avatar
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Jim Dirkes
answered 2021-05-09 18:28:15 -0500
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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's avatar codybond (2021-05-10 09:17:02 -0500) edit
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