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High cooling load

asked 2018-02-28 12:00:34 -0500

Guinha gravatar image

updated 2018-02-28 21:20:53 -0500

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)

About the model:

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

Internal Loads People: zero

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

File- https://drive.google.com/open?id=1IHe...

Thank's!

image description

image description(/upfiles/15198405231969875.png)

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Comments

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

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

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

Guinha gravatar imageGuinha ( 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

TomB gravatar imageTomB ( 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?)

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

Of Corse! I'll add the file in a link.

Guinha gravatar imageGuinha ( 2018-02-28 21:06:21 -0500 )edit

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answered 2018-03-01 10:19:08 -0500

Guinha gravatar image

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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Asked: 2018-02-28 12:00:34 -0500

Seen: 67 times

Last updated: Mar 01 '18