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Cooling optimization (Calculated plane)
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This question was originally posted on DCIM Support by Waseem Khan on 2018-11-19
Jef Faridi Hi jef
Its been a long time hope you're doing good
I'm preparing a cfd for our new project its for 156 racks in which we are using 6 crah units in-row cooling the details are below
2 ups: each 1200 KW- Total 2400 KW redundant
2 PDU- Power panels which are then connected to rack pdu
we are using 2 rpdu's in each cabinet (Redundant Environment) each rpdu is connected with 63amp single phase breaker of PDU
and the load inside each cabinet is 7700 watts (7.7KW)
(i have used a generic server and kept 7700 watt in each cabinet)
My question is when i calculate the cooling the ( calculated plane ) the average cooling seems not perfect attached are the screenshots you can check the cabinets
the right hand side cabinets are showing more temperature than the left side even though i have kept the same load in each cabinet with same size of breaker and also if the cooling unit is closed to the cabinets why the temperature is still high for those cabinets. it seems there is something wrong
On the end row the right hand side displays the normal temp while the left side here shows abnormal values and those cabinets are also close to the cooling units
Pls suggest and support- if anything else is required to identify the issue kindly ask
Regards
Accepted Solutions
This answer was originally posted on DCIM Support by Jef Faridi on 2018-11-22
Hi Waseem,
Many thanks for providing the access to your setup, which I've studied locally.
It appears basically a configuration related, there is no bug here 😀
In this setup:
you have 156 racks containing 1 server each (7.7 kW), that may give us 1201 kW power consumption in total
you have also 6 cooling units (with 24 kW power consumption each, 144 kW in total)
heat in total: 1345 kW
Those 6 cooling units have 138 kW cooling capacity each, so
cooling capacity in total would be: 828 kW
So it appears there is not enough cooling capacity here.
There are also some other configuration settings could be looked into:
You have perforated floor tiles, so you might want to enable the Raised floor settings and enter your floor height (right click on floor > Properties > Floor):
Cooling units contain manually defined values, such as:
Some of those numbers seem to be randomly chosen and if the calculations (behind the scene) don't add up, then we may see unexpected simulation.
Location and orientation of the floor equipment would definitely also play an import role when simulating the temperature map.
Kind regards
This answer was originally posted on DCIM Support by Jef Faridi on 2018-11-22
Hi Waseem,
Many thanks for providing the access to your setup, which I've studied locally.
It appears basically a configuration related, there is no bug here 😀
In this setup:
you have 156 racks containing 1 server each (7.7 kW), that may give us 1201 kW power consumption in total
you have also 6 cooling units (with 24 kW power consumption each, 144 kW in total)
heat in total: 1345 kW
Those 6 cooling units have 138 kW cooling capacity each, so
cooling capacity in total would be: 828 kW
So it appears there is not enough cooling capacity here.
There are also some other configuration settings could be looked into:
You have perforated floor tiles, so you might want to enable the Raised floor settings and enter your floor height (right click on floor > Properties > Floor):
Cooling units contain manually defined values, such as:
Some of those numbers seem to be randomly chosen and if the calculations (behind the scene) don't add up, then we may see unexpected simulation.
Location and orientation of the floor equipment would definitely also play an import role when simulating the temperature map.
Kind regards
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