Dco 8.1 Cooling Plane Type - Calculated Plane

[DCIM_Support]

This question was originally posted on DCIM Support by Gianluca Bertuletti on 2017-10-16

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Hi

i'm having an issue about "Cooling Plane Type - Calculated Plane"

when i press "calculate" i get this issues

• Vertical Grille Imbalance: Less air is supplied than returned
• Floor tile airflows did not add up to downflow CRAC airflows

How can i solve it?

Thanks

(CID:126164137)

[DCIM_Support]

This answer was originally posted on DCIM Support by Valentin Kozlov on 2017-10-16

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HI!

Here is my suggestions:

1. Check airflow direction in grill properties and airflow values. it should be equal.

      2. When you use vertical grills, you have no needs in CRACS to model airflows.

Now your CRACs and tiles are in different rooms that's why you have second error.

Try to delete CRAC units or "turn off" unit and model it again.

(CID:126164255)

[DCIM_Support]

This comment was originally posted on DCIM Support by Gianluca Bertuletti on 2017-10-16

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airflow direction of vertical grille is "out of room"

Crac is underfloor

Tile and Cracs are not in different room

but in this configurarion we have more than 40 rooms

(CID:126164269)

[DCIM_Support]

This comment was originally posted on DCIM Support by Valentin Kozlov on 2017-10-16

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I dont see CRACS in that room...

You should consider that vertical grills are not works together with CRACs in cooling calculations. So, to model your setup, you need to have grills with "Out of room" direction and the same quantity of "In room" grilles placed under floor. In this case calculations should be correct.

(CID:126164276)

[DCIM_Support]

This comment was originally posted on DCIM Support by Gianluca Bertuletti on 2017-10-16

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Sorry

here the cracs

(CID:126164279)

[DCIM_Support]

This answer was originally posted on DCIM Support by Jef Faridi on 2017-10-16

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Hi Gianluca,

Concerning the Vertical grille imbalance: the total amount of Airflow for "Out of room" must be the same as "Into room", here is to illustrate two vertical grilles, one Out of room, and one Into room, with the same amount of Airflow:

Concerning the floor tiles and downflow CRAC: you have CRAC units placed outside the room, so you might want to enable CRAC's "Duct to ceiling" feature, configure room to use Drop ceiling (if not configured already) and add some ceiling tiles:

Kind regards

(CID:126164437)

[DCIM_Support]

This comment was originally posted on DCIM Support by Gianluca Bertuletti on 2017-10-16

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Hi Jef

This is my real configuration

• Crac Downflow

• Cold Air inside the room under floor with perdorated tile

• Hot air outside room by vertical grille

(CID:126164499)

[DCIM_Support]

This comment was originally posted on DCIM Support by Jef Faridi on 2017-10-17

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Hi Gianluca,

I think the best way to model your configuration could be using Perforated Floor Tile(s) and CRACs (ducted to ceiling) + Perforated Ceiling Tile(s):

You can also add vertical grilles to the model, but make sure that the total airflow (In and Out of room) is in-balance (or just simply not define airflow's, and let them be zero for vertical grilles).

Kind regards

(CID:126164747)

[DCIM_Support]

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