Data Center Cooling - how are data centre cooled cold aisle containment hvacr
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Date: 2023-11-17
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Comments and reviews: 30
Steven
I've worked in both mid-sized data centers and computer labs back in the 1970s and 80s. Back then, single mini-computer installations were similar to today's data centers in they were installed on raised floors with significant quantities of cooled air, as those O. G. computers produced a large amount of heat that needed to be constantly removed. Sharing the space near a cooled computer mean wearing a heavy jacket or parka, unless you love arctic conditions LOL! I believe the air was being pumped from the floor at about 40 degF, not much warmer than the interior of a refrigerator, and 100s or 1000s of cubic feet / minute. Nowadays, people complain if their laptop gets a bit warm or they can hear those whisper-quiet cooling fans. In that data center, you'd be lucky if you could hear your own thoughts. It's like a constant speed hurricane! I'm sure there are many more clever solutions to cooling nowadays.
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I've worked in both mid-sized data centers and computer labs back in the 1970s and 80s. Back then, single mini-computer installations were similar to today's data centers in they were installed on raised floors with significant quantities of cooled air, as those O. G. computers produced a large amount of heat that needed to be constantly removed. Sharing the space near a cooled computer mean wearing a heavy jacket or parka, unless you love arctic conditions LOL! I believe the air was being pumped from the floor at about 40 degF, not much warmer than the interior of a refrigerator, and 100s or 1000s of cubic feet / minute. Nowadays, people complain if their laptop gets a bit warm or they can hear those whisper-quiet cooling fans. In that data center, you'd be lucky if you could hear your own thoughts. It's like a constant speed hurricane! I'm sure there are many more clever solutions to cooling nowadays.
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Eric
Very cool. I work for a large Data Center that builds on slab, hot isle contained data halls. We employ multi-mode airhandlers that are not in the data hall but outside. Cold air is ducted to above the server cabinets. Our air handlers have direct expansion, indirect expansion via an evaporative cooling tower system, direct evaporative cooling in unit AND access to economizer/ free cooling as able to. We even have areas where using the outside evap coolers we have liquid cooling piped into the server cabinets. We went away from CRAC due to potential issues they presented to the Servers when failures happened in the data halls; Too risky. Having the set up we do allows plenty of redundancy both for individual unit component failure and total capacity as well as efficiency for cooling and power. Thanks for the video!
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Very cool. I work for a large Data Center that builds on slab, hot isle contained data halls. We employ multi-mode airhandlers that are not in the data hall but outside. Cold air is ducted to above the server cabinets. Our air handlers have direct expansion, indirect expansion via an evaporative cooling tower system, direct evaporative cooling in unit AND access to economizer/ free cooling as able to. We even have areas where using the outside evap coolers we have liquid cooling piped into the server cabinets. We went away from CRAC due to potential issues they presented to the Servers when failures happened in the data halls; Too risky. Having the set up we do allows plenty of redundancy both for individual unit component failure and total capacity as well as efficiency for cooling and power. Thanks for the video!
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Gary
As a server tech I was sent to do a SAN upgrade to a customers in house datacenter. Expecting to be in there for hours I brought a nice warm jacket. When I walked into the DC it was like stepping into a sauna. The air con system had failed, there were buckets of water catching leaking AC and they had house fans plugged in trying to cool all the equipment. There were hundreds of red flashing leds on all the server and storage equipment in the racks. I have also encountered Datacenter AC failure with water leaking from the roof soaking the racks below. With staff frantically calling their server storage hardware vendors to log warranty calls and of course not mentioning the flood they were exposed too. Cooling failure in a DC is catastrophic, u better have a redundant solution in place.
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As a server tech I was sent to do a SAN upgrade to a customers in house datacenter. Expecting to be in there for hours I brought a nice warm jacket. When I walked into the DC it was like stepping into a sauna. The air con system had failed, there were buckets of water catching leaking AC and they had house fans plugged in trying to cool all the equipment. There were hundreds of red flashing leds on all the server and storage equipment in the racks. I have also encountered Datacenter AC failure with water leaking from the roof soaking the racks below. With staff frantically calling their server storage hardware vendors to log warranty calls and of course not mentioning the flood they were exposed too. Cooling failure in a DC is catastrophic, u better have a redundant solution in place.
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Roshan
Servers are being designed every day to withstand higher Temperatures so that Cooling Load reduces drastically. DCs have been designed till 38 deg C Hot Aisle Temperature so save sufficient load on Chilled Water System.
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Diifference between CHW Temperatures have to be as large as possible to decrease the Pumping GPM and thus the Load.
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All inverter (Partial Load) Motors provide higher efficiency at lower speeds. So designing Tier 4 DCs with N+N Redundancy and running both systems (2N Chillers with Inverter Compressors & 2N CRACs with EC Fans) at partial loads provide higher Efficiencies.
Of course, very little of the stated above applies to American Colder Climate with Free Cooling possibilities but Servers with higher Temperature Resistances always help.
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Servers are being designed every day to withstand higher Temperatures so that Cooling Load reduces drastically. DCs have been designed till 38 deg C Hot Aisle Temperature so save sufficient load on Chilled Water System.
.
Diifference between CHW Temperatures have to be as large as possible to decrease the Pumping GPM and thus the Load.
.
All inverter (Partial Load) Motors provide higher efficiency at lower speeds. So designing Tier 4 DCs with N+N Redundancy and running both systems (2N Chillers with Inverter Compressors & 2N CRACs with EC Fans) at partial loads provide higher Efficiencies.
Of course, very little of the stated above applies to American Colder Climate with Free Cooling possibilities but Servers with higher Temperature Resistances always help.
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Chris
Some cooling centers use cold isle and hot isle. And some use cooling towers, while others use a different form. They are crazy. They have massive generators, and they are normally powered directly from the power source, IE hydroelectric dams. one building can generate 1 trillion a year, and one section of the building can generate 500 million to 500 billion. I currently work at one such site. I work on ones that do not use refrigerant due to size, they are designed to be replaced after 10 years.
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Some cooling centers use cold isle and hot isle. And some use cooling towers, while others use a different form. They are crazy. They have massive generators, and they are normally powered directly from the power source, IE hydroelectric dams. one building can generate 1 trillion a year, and one section of the building can generate 500 million to 500 billion. I currently work at one such site. I work on ones that do not use refrigerant due to size, they are designed to be replaced after 10 years.
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Shankar
Well in-order to #floor cooling why we're always intended to flow the cold #AirCirculation part only from the bottom of the #DataCenter, because sometimes I just think why can't we put the entire Cooling System under the false floor of #DC, including the #WaterTank itself.
I mean to say the #DC Room itself will be able to conceive the part of its #ChillingUnit under the false floor.
P. S. While maintaining all type of #Precautions and #Safety factor.
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Well in-order to #floor cooling why we're always intended to flow the cold #AirCirculation part only from the bottom of the #DataCenter, because sometimes I just think why can't we put the entire Cooling System under the false floor of #DC, including the #WaterTank itself.
I mean to say the #DC Room itself will be able to conceive the part of its #ChillingUnit under the false floor.
P. S. While maintaining all type of #Precautions and #Safety factor.
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Arsenaultc80
UPS and battery monitoring technician here. Worked in data centers for the past 8 years. Ive been at data centers that use that evaporative (they called it adiabatic) cooling where they should not have. I was in a battery room that was 88 degrees F (31 C) probably 100 percent humidity. Not a good environment for batteries. This was a major company but I cant say who because of an NDA.
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UPS and battery monitoring technician here. Worked in data centers for the past 8 years. Ive been at data centers that use that evaporative (they called it adiabatic) cooling where they should not have. I was in a battery room that was 88 degrees F (31 C) probably 100 percent humidity. Not a good environment for batteries. This was a major company but I cant say who because of an NDA.
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PotSmokingBatman
i used to work in the 9/11 memorial as an engineer. Data centers were top alert at all times, and we had more than a few emergencies where the temp climbed from 60 to near 82 in minutes. The port authority server room had two constantly running dataaire units, and you literally had to wear a jacket if you were working inside for any length of time.
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i used to work in the 9/11 memorial as an engineer. Data centers were top alert at all times, and we had more than a few emergencies where the temp climbed from 60 to near 82 in minutes. The port authority server room had two constantly running dataaire units, and you literally had to wear a jacket if you were working inside for any length of time.
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education
This is a very well explained video. I think the performance of the cooler is important, but in the end, the most important thing is to effectively convect and dissipate the generated heat. It seems that the actual cooling energy consumption can be reduced through this.
I think it is good to optimize the air flow to effectively dissipate heat.
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This is a very well explained video. I think the performance of the cooler is important, but in the end, the most important thing is to effectively convect and dissipate the generated heat. It seems that the actual cooling energy consumption can be reduced through this.
I think it is good to optimize the air flow to effectively dissipate heat.
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Roland
Very interesting video!
A good tip for efficiency is to explain to the customers/rack owners, that blanking panels and correct installed equipment are mandatory.
No matter, how smart you build your mechanical cooling system and cold aisles. when the equipment you want to cool is not installed properly, you will always have an issue.
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Very interesting video!
A good tip for efficiency is to explain to the customers/rack owners, that blanking panels and correct installed equipment are mandatory.
No matter, how smart you build your mechanical cooling system and cold aisles. when the equipment you want to cool is not installed properly, you will always have an issue.
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zodiacfml
accurate, correct until the last part. 8: 20 racks don't exhaust air to the rear but to the top. data center cooling though still lacks efficiency/innovation. for example, humans working in data centers don't need to be cooled or the building/room containing the racks. cool air can simply sucked underneath the racks but no.
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accurate, correct until the last part. 8: 20 racks don't exhaust air to the rear but to the top. data center cooling though still lacks efficiency/innovation. for example, humans working in data centers don't need to be cooled or the building/room containing the racks. cool air can simply sucked underneath the racks but no.
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Wilfred
The most environmental unfriendly things from. the moment, data centers.
Some use green energy, the claim.
But still they have emergency generators as backup power which are test run on a regular basis.
Still a big CO2 contamination while the data centers also take the green energy away from normal houses.
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The most environmental unfriendly things from. the moment, data centers.
Some use green energy, the claim.
But still they have emergency generators as backup power which are test run on a regular basis.
Still a big CO2 contamination while the data centers also take the green energy away from normal houses.
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HVAC
I was told by a DC Manager that Liquid Immersion Cooling will replace all of the above, on new DCs over the next 10 years. It's the next gen server cooling system apparantly. No CRAC's, CRAH'S, AHU's, Chillers, Raised Floors, Hot/Cold Aisle Containment etc. Would be nice to see a vid on that.
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I was told by a DC Manager that Liquid Immersion Cooling will replace all of the above, on new DCs over the next 10 years. It's the next gen server cooling system apparantly. No CRAC's, CRAH'S, AHU's, Chillers, Raised Floors, Hot/Cold Aisle Containment etc. Would be nice to see a vid on that.
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education
Question: Is it possible to harness the heat from the hot air flowing in the ceiling into energy?
Because I have a dumb tought of placing a stirling engine (which I discovered by yt recommend) on the top of the ceiling where the hot air flows
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Question: Is it possible to harness the heat from the hot air flowing in the ceiling into energy?
Because I have a dumb tought of placing a stirling engine (which I discovered by yt recommend) on the top of the ceiling where the hot air flows
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MOHAMMAD
Perfect, practical thanks
Some manufacturers also keeping heaters inside the CRAC unit, it will operate after deep cooling during dehumidification process.
I didnt see that in the video, how the dehumidification going in the video?
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Perfect, practical thanks
Some manufacturers also keeping heaters inside the CRAC unit, it will operate after deep cooling during dehumidification process.
I didnt see that in the video, how the dehumidification going in the video?
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Jim
How about a video on oscillators? How an inductor and capacitor in parallel circuit can make an oscillator. How they are used to make frequencies for radio applications. And finally, talk about quartz crystal oscillators.
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How about a video on oscillators? How an inductor and capacitor in parallel circuit can make an oscillator. How they are used to make frequencies for radio applications. And finally, talk about quartz crystal oscillators.
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John
I installed many cooling units in data centers. They also has Halon fire suppression systems in them. I always worried about setting off the Halon system while working in them. Halon gas eats oxygen in the room quickly.
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I installed many cooling units in data centers. They also has Halon fire suppression systems in them. I always worried about setting off the Halon system while working in them. Halon gas eats oxygen in the room quickly.
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engineering_mindset
One Ive built is a hot aisle/cold aisle, air/mist evaporation cooled on from the second floor and forced down through the roof of the data hall and then hot air is removed and either mixed or expelled.
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One Ive built is a hot aisle/cold aisle, air/mist evaporation cooled on from the second floor and forced down through the roof of the data hall and then hot air is removed and either mixed or expelled.
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ejonesss
they could liquid cool the servers have waterblocks similar to what you would use on your pc cpu and gpu.
they also make north and south bridge as well as hard drive and ssd water blocks.
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they could liquid cool the servers have waterblocks similar to what you would use on your pc cpu and gpu.
they also make north and south bridge as well as hard drive and ssd water blocks.
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GOTH
not sure about the evaporator cooling method. doesn't all the moister cause eventual corrosion of components and inter connects, shorts in the equipment, and possible data corruption and or loss?
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not sure about the evaporator cooling method. doesn't all the moister cause eventual corrosion of components and inter connects, shorts in the equipment, and possible data corruption and or loss?
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Arsenaultc80
A data center video on how the critical load is maintained during power outage by generators, ATSs, UPSs, PDUs, and static switch PDUs would be cool. Theres so many configurations though.
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A data center video on how the critical load is maintained during power outage by generators, ATSs, UPSs, PDUs, and static switch PDUs would be cool. Theres so many configurations though.
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Phil
What is the priority for cooling a data center, processors or storage? If it's processors then the best way would be in oil that is then cooled and recirculated. Usually a swamp cooler outside.
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What is the priority for cooling a data center, processors or storage? If it's processors then the best way would be in oil that is then cooled and recirculated. Usually a swamp cooler outside.
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Timothy
Humidification is a lot more important than youre letting on. Also I dont know how other places do it but our towers are vented from directly beneath so theres no chance of recirculating.
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Humidification is a lot more important than youre letting on. Also I dont know how other places do it but our towers are vented from directly beneath so theres no chance of recirculating.
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Prototypo
The refrigerant flow at 3: 30 is incorrect as it indicates coolant flowing from both ends of the piping towards the evaporator, thus having no coolant exiting the evaporator.
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The refrigerant flow at 3: 30 is incorrect as it indicates coolant flowing from both ends of the piping towards the evaporator, thus having no coolant exiting the evaporator.
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Michael
2: 13. Just an FYI, The correct term is raised floor. The phrases Suspended floor implies the floor is hanging from a tension system much like the deck of a suspension bridge.
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2: 13. Just an FYI, The correct term is raised floor. The phrases Suspended floor implies the floor is hanging from a tension system much like the deck of a suspension bridge.
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mettc
I would like to ask you if there's any difference when I placed the crac linear with the cold aisle or linear with the hot aisle? which is more efficient? Can I Calculate it?
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I would like to ask you if there's any difference when I placed the crac linear with the cold aisle or linear with the hot aisle? which is more efficient? Can I Calculate it?
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Carlos
I don't get how the position of the evaporator coil is completely horizontal, from my understanding it should be installed at least with 60 degrees of inclination.
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I don't get how the position of the evaporator coil is completely horizontal, from my understanding it should be installed at least with 60 degrees of inclination.
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IgneusFlama
Something about the animation at 3: 47 was confusing me. Then I realized the pipes going into the evaporator are both flowing in and neither are flowing out.
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Something about the animation at 3: 47 was confusing me. Then I realized the pipes going into the evaporator are both flowing in and neither are flowing out.
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Crazy
Even with optional airflow equipment, data center operations folk seem to still have a knack for installing intake on the hot aisle and exhaust on the cold aisle.
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Even with optional airflow equipment, data center operations folk seem to still have a knack for installing intake on the hot aisle and exhaust on the cold aisle.
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Tristan
Great video, but the animation at 3: 50 wrongly shows the coolant flowing into both side of the evaporator. But overall great overview with enough specifics.
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Great video, but the animation at 3: 50 wrongly shows the coolant flowing into both side of the evaporator. But overall great overview with enough specifics.
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