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Is there a way (in OpenStudio) to add electrical usage for a zone without introducing an internal heat gain?

asked 2018-10-12 12:01:02 -0500

The reason I ask is that I'm modeling an existing building with a data center. The servers have their own, built-in cooling which rejects heat to the outdoors (condenser section located on the roof). The servers (including their in-rack cooling) are metered separately from the rest of the building. Initially I used this data to generate an EPD, but I know realize that this is double counting the load by reporting electrical usage (which I want it to do) and requiring the building HVAC to cope with the internal gains from the high EPD (which I don't want it to do).

I realize that under some circumstances I could just remove the EPD and add the electrical consumption post-run, but this will not work with the rest of my post-processing. Any help would be greatly appreciated.

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answered 2018-10-12 12:51:41 -0500

Set the 'Fraction Lost' field in the ElectricEquipment object:

This field is a decimal number between 0.0 and 1.0 and is used to characterize the amount of “lost” heat being given off by electric equipment in a zone. The number specified in this field will be multiplied by the total energy consumed by electric equipment to give the amount of heat which is “lost” and does not impact the zone energy balances. This might correspond to electrical energy converted to mechanical work or heat that is vented to the atmosphere.

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Thanks! So in this case I would enter 1. I'm assuming that by default it would be 0.

jbatt's avatar jbatt  ( 2018-10-12 12:56:56 -0500 )edit

yes, default is 0. enter 1.

mdahlhausen's avatar mdahlhausen  ( 2018-10-12 14:18:05 -0500 )edit

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Asked: 2018-10-12 12:01:02 -0500

Seen: 254 times

Last updated: Oct 12 '18