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Computer Room Air Conditioning - How do CRAC units work?
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- เผยแพร่เมื่อ 11 ต.ค. 2022
- How do computer room air conditioners work, in this video we learn how CRAC units work for server room air conditioning
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sir please explain about 6.6kv vcb panel which run ht motor
Me too
I watch as i sit next to the CRAC unit… learning its secrets 👀😂
It’s not a secret. It’s a cycle. Lol
Great video! In the data center engineering industry we reserve “CRAC” designations for units with a direct expansion inside the CRAC and closed loop refrigerant such as R-410 is the only heat transfer media. This is similar to a mini split air conditioner or other AC unit.
If the heat transfer media is chilled water, the industry term is “CRAH” or Computer Room Air Handler.
Your content is top notch as always and I sometimes send new engineers your videos. Keep up the great work!
Everything base on this designs are CRACs here. never heard of CRAH. feels odd given the units all look identical.
I was just given a project on CRAC units lol. Now I have a better understanding of their purpose. Thanks!!
CRAC units also like normal building ducted air systems, interface with building systems like VESTA, so in event of fire they shutdown, this is essential since if the suppression system fires, its agents are not being extracted, allowing it to do its job and extinguish flame and preventing reignition
Another remake right? As always....extremely informative!!
Very interesting how these systems function. I do like the cover on top to force the hot air up and over to the CRAC unit.
Just chillling out ❄❄
Thank you I learnt a lot from your Channel
Our CRAC units have the compressors inside the units along with a water cooled condenser. Then the water pipes go outside to coolers. They also have a refrigerant coil and water coil, so In the colder months it uses water chilled by the outside air
During my childhood I saw this thing in NCERT books and now I am happy to learn it . This is my pleasure to find such channel contain awesome videoes and also better sound effect then other...
😍😍😍 Thanks man for this
Ya
That's the proper and sensible way to do it, but I have seen so many companies just use standard ceiling mounted air conditioning units.
If it's only a small server room then it makes little sense to spend 3 or 4x as much on a CRAC unit instead.
fascinating!
Great
Great! 👍
Have you made a video of making electrical schematics. Like how your choosing wire numbers locations of devices in a panel and how you would find it. I think that would help alot of people.
Great info regarding this video 👍
Q? 😇, do crack system had a cooling capacity ( BTU or tons ) like chiller & home ac air-conditioning.
Thanks 😊 and good luck 👍
Funnily enough, I'm installing CRAC units this week in a hospital - but not for server rack cooling, they're being used for CT Imager cooling. Also, they're configured to supply conditioned air out the top and draw return air through the bottom.
Interested to know what is the temperature difference between supply and return air. Hot air rise to the top, so it will be inefficient to supply cold air on top and draw back from bottom.
Cool
Edit from a European DC Provider - normally with indirect cooling... the hot water from the CRAC units is cooled in towers for normal cooling and then additional cold water from the Chiller is added if needed (if outside temp is ober $°c)
suspended floor? I think you mean "raised" floor :)
Your last method is close to the best, cold room but its better to send exhaust into plenum from each rack via boot systems, where its extracted in part, and recycled in another part, in such systems it is also code in many countries to inject external "fresh" air into the mix, rather than just recycling the same hot air over and over, but all in all a good explanation
just chilling out
QUESTION: We have several Liebert crac units with water cooled condensers. Currently we use approx 70deg water flowing through the condensers. However, we need to know if we used 55 degree water would it drastically effect the units efficiency. There is a condenser water control valve in each unit. I ask because there are no parameters recommended in the owners manual. Any help here would be greatly appreciated.
Just chilling out
Just Chilling Out
Instead of a floating floor design, I wonder if this could be used as a geothermal system and just do away with all the cooling system components?
It’s also worth noting that every CRAC unit is going to contain some form of active humidification.
60 % +/- 5 in this neck of the woods
Not always in the units, we use seperate steam humidifiers. But I guess there is more than one way to skin a cat.
Yo
Does Air coolded Crac unit also called Crah unit ? Please clarify I'm confused lol
6:50 hot air containment : Does Hot air containment have to be larger than the cool room containment?
I'm A UPS trchnician. CRAC units are unsung heroes lmao
used to help design off-site data storage centres when i worked in london. doesn't look like it has changed much over the years.
Why compressor are placed inside indoor unit instead of outdoor
I’ve built data centers in my career….. this is spot on.
That second "CRAC" unit you describe is a CRAH... no?
Crac uses refrigerant and crah uses chilled water
I’m “just chilling out”
Did someone say crack?
Ah, that's just where we've always hidden our dark web crack, that was the OG name for it.
I made first comment after creator
Have you ever done a video on Preconditioned air units?
just chilling out