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Hello all,

I’m simulating a datacenter and the simulation shows a high cooling load. The internal equipment load is 276,3 Kw from racks and the cooling load is 362,97 Kw. Why this happen? How can I find this extra load? The Simulation has a measure that shows all loads from a zone. (Second image)

Construction External wall: All external wall is adiabatic - no Sun and no Wind

Infiltration: zero

Outdoor Air: zero

Equipment: 276,3 Kw (total)

Equipment Schedule (fraction): 1

Light: 11.84 W/m² Office_IT_Room Lights

Setpoint:

Datahall: 27C

Central Cooling Design Supply Air Temperature: 14C

Thank's!

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Did you check all the other loads for the space - Lighting, occupancy (if any), infiltration (if any), outside air supply to the system?

( 2018-02-28 13:41:33 -0500 )edit

Hi @rsunnam! Yes! I've checked all loads.

( 2018-02-28 15:00:37 -0500 )edit
1

On your chart you show Total (sensible + latent). In your table you only show sensible. I suspect a constant latent load is the difference. can you show more evidence to support there is zero infiltration and outside air loads

( 2018-02-28 17:14:15 -0500 )edit

Also, which cooling coil is shown in the plot? (Just to make sure that we are looking at the terminal cooling coil for the 00-CPD zone). I would first make sure that the coil is not hardsized in the model. Then as Tom mentioned, I would check for latent loads within the zone. (Check for the "Fraction Latent" for the "ElectricEquipment" objects, maybe?)

( 2018-02-28 18:50:10 -0500 )edit

( 2018-02-28 21:06:21 -0500 )edit

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The problem is just in the simple unit conversion. The internal load was 63000 W, but the correct load is 6300 W. All the cooling load is correct now.

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