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Enthalpy Energy Recovery plus Sensible Heat Recovery for Reheat

asked 2023-02-14 14:55:00 -0500

ashopinion's avatar

updated 2023-12-11 10:30:26 -0500

Can energy plus simulate AHU / DOAS units that incorporate dual enthalpy wheels or series energy recovery? I typically encounter it in dehumidification applications in an effort to reduce reheat loads. Here's a link to some manufacturer application examples with schematics.

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answered 2023-12-11 19:50:05 -0500

Keigo's avatar

updated 2023-12-11 19:52:19 -0500

The answer is Yes. Why not try? You can model it in a few minutes.

I just added two HeatExchanger:AirToAir:SensibleAndLatent objects before OutdoorAir:Mixer to an ExampleFile 5ZoneWarmest.idf. No coil is added between the HEXs, but you can do so.

5ZoneWarmest_2HEXs.idf (V23-2-0)

BTW, I haven't seen two Enthalpy Wheels system at least in East Asia. Desiccant Wheel (HeatExchanger:Desiccant:BalancedFlow) or Desiccant Wheel + Sensible/Enthalpy Wheel is often used for efficient dehumidification.

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Thanks Keigo! I'm a design builder user and I think that feature is locked out.

Greg Estep's avatar Greg Estep  ( 2023-12-12 09:31:49 -0500 )edit

That's my issue too. DB is only on E+ 9.4 and you're limited by the functionality of that front end. I wasn't able to confirm if newer versions of E+ can do this. I don't know the E+ language well enough to be "trying this out" in an idf editor directly.

ashopinion's avatar ashopinion  ( 2023-12-12 15:42:28 -0500 )edit

Another option: OpenStudio also allows to place two HeatExchanger:AirToAir:SensibleAndLatent objects in the AirLoop if you are not familiar with IDFEditor.

Keigo's avatar Keigo  ( 2023-12-12 18:28:54 -0500 )edit

answered 2023-12-11 19:09:16 -0500

Greg Estep's avatar

I don't think you can add dual enthalpy wheels, but you could simply use the manufacturers reported overall effectiveness and enter those values.

I use for dehumidification reheat.

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Asked: 2023-02-14 14:55:00 -0500

Seen: 130 times

Last updated: Dec 11 '23