Re: [EnergyPlus_Support] New Feature Request - "Return Air Fraction" and "Exhaust Air Fraction" for Internal Loads?

["Linda Lawrie linda@xxxxxxxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>]

I believe you can enter a new feature request directly into
the github system for EnergyPlus.

At 09:36 AM 4/24/2015, Karen Walkerman kwalkerman@xxxxxxxxx
[EnergyPlus_Support] wrote:


> I'm currently modeling a few
> buildings where the design team wants to explore the effectiveness of
> heat recovery on kitchen exhaust hoods.
>
> In the DOE Commercial Reference Buildings, kitchen cooking equipment -
> 70% of the energy is modeled as "lost." Â Some of this energy
> is truly "lost" to the food being cooked, but much of it is
> captured and exhausted by hoods.  It is not mixed with the zone,
> but in the model, it is captured by a system and should be modeled as
> such.
>
> When modeling lights and refrigeration equipment, we are given the option
> to specify a "return air fraction" - a portion of the heat that
> is transferred directly to the zone return air.  It would be
> awesome if this option were added to the following objects:
>
> ElectricEquipment
> GasEquipment
> SteamEquipment
> HotWaterEquipment
> OtherEquipment
>
> It would also be great to have an "Exhaust Air Fraction" option
> - so that some of the heat generated could be assigned directly to the
> exhaust air node.
>
> While the need to model kitchen exhaust heat recovery illuminates the
> limitation within EnergyPlus, it is a limitation in accurately modeling
> kitchen energy use even without heat recovery.
>
> Thanks!
>
> Karen

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Posted by: Linda Lawrie <linda@xxxxxxxxxxxxxx>

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