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Suggestions for incorporating thermal mass of data center equipment

asked 2015-10-25 09:40:10 -0500

Rehan Khalid's avatar

updated 2015-10-26 18:09:14 -0500

Hi, I'm trying to model data centers and want to know how to incorporate a server's thermal mass within EP (thermal capacitance and effectiveness) and how does EP currently model ITE equipment. Thanks

No help available on thermal mass of electric equipment or ITE equipment. Closest is internal mass for interior partitions or maybe furniture.

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answered 2015-10-26 11:36:07 -0500

EnergyPlus has an object devoted specifically to modeling Air-Cooled IT equipment, and you can reference the input fields and output variables. To see how EnergyPlus calculates exit air dry bulb temperature, you can reference the Engineering document.

From looking at the EnergyPlus Engineering document, it does not appear that EnergyPlus performs calculations related to the thermal mass of the IT Equipment, since it doesn't request any dimensions or heat storage properties of the equipment.

If you have mathematical models to describe the server transient behavior, you can incorporate them into an EnergyPlus model using the Energy Management System capability. This allows the user to create their own variables and equations to apply various types of changes to the model. Usually, this capability is used in complicated control actions using logic, but I've seen it used to calculate air leakage connections between ducts / plenums and conditioned spaces (which EnergyPlus doesn't handle well).

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Thank you so much for the detailed reply Sir. That clears up quite a few issues. The EMS route seems to be the best option. Let me try to work on that and see what I can up with.

Rehan Khalid's avatar Rehan Khalid  ( 2015-10-26 12:06:19 -0500 )edit

You're welcome! If you do end up using the InternalMass object to model the IT equipment, it's a bit tricky. You should look at the top answer to this question for some modeling tips.

Aaron Boranian's avatar Aaron Boranian  ( 2015-10-26 16:30:43 -0500 )edit

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Asked: 2015-10-25 09:40:10 -0500

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Last updated: Oct 26 '15