[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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



Hi Jean,

My current project has all electric cooking equipment, so I am actually using the lights object for radiant and return air loads, and an "OtherEquipment" object for the latent loads.

Even if I had gas equipment, I would probably do it this way and then use some custom meters and the detailed energy use summary for utility costs and reporting.

Karen

On Apr 25, 2015 8:46 AM, "'jeannieboef@xxxxxxxxx' jeannieboef@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
 

Hi Karen,
Do you have a work-around? I was thinking of splitting the zone with the cooking equipment with a week air flow link over a IRwall. I've luckily not had an kitchen exhaust with heat recovery.

Mit freundlichen Grü�en- Sent from my iPhone (excuse the brevity)

i. A.
Jean Marais
b.i.g. bechtold

On 24.04.2015, at 17:36, "Karen Walkerman kwalkerman@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> 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."  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



__._,_.___
Posted by: Karen Walkerman <karen@xxxxxxxxxxxxx>


Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.



Visit Your Group
Yahoo! Groups
• Privacy • Unsubscribe • Terms of Use

__,_._,___