I find it interesting when someone is trying to describe the trans-critical system; there are a lot of terms thrown about when trying to describe the state of the CO2 above the critical point. As said in the video it is neither gas/vapour or liquid. It is a supercritical fluid. A vapour would refer to a gas that is in equilibrium with a liquid phase, liquid is a subcooled state and gas is a superheated state. Supercritical is some kind of hybrid between liquid and gas and has properties of both. There is a mistake in the video to refer to CO2 above the critical point as 'transcritical' - it is not, it is supercritical. The system is transcritical because it operates on pressures that are both above and below the critical point and hence critical pressure. The system works across the critical pressure, hence 'trans' meaning across. 'Super' refers to above - i.e. supercritical is above the critical pressure.
Used to have a small Coca Cola cooler for drinks. The Coca Cola company gave it to the restaurant owner. It used Co2 as refrigerant, and leaked. After swapping it with a R134a compressor, it works very good and no leaks any more (Over 2 years now). So high pressure means you have more potential leaks
Thank you very much for the effort of putting this together, guys! My head is saturated (!) now;) Have to watch it a few times to get it all in. Very interesting! You use a lot of the same components as us europeans, but the electrical standards are quite different.
Wow, very interesting. The polar opposite of elegant simplicity. Rube Goldberg? Must be dramatically more efficient, or it wouldn’t be worth it. I would imagine that the upfront cost is high, and the service call costs will be even higher!
The reason its called a transcritical rack is because its a cycle when the system goes above critical point co2 becomes a supercritical fluid and it transitions into the transcritical cycle. If you look at a enthalpy diagram we get a better idea of the cycles. Now when the system is below the critical point thus it runs in a subcritical cycle which is what were used to seeing because all other refrigerants have a much higher critical point.
Need two guys when servicing,one guy to work on these co2 systems and one guy to call 911 when a valve blows off and ripps off the first guys head from the 1500 psi of co2
Thank you & appreciated for sharing about CO2 Refrigeration. Need more further information of that systems such as sub critical system, about pipe thickness, power consumption compared to other systems etc...
Super confusing for an old school tech like myself but brilliant all the same, thanks guys for the post, l think l will be watching this a number of times to figure the whole C02 processes, the new techs must be left scratching their heads when it comes to trouble shooting this type of system, I feel like a 1st year apprentice again......
That entire rack looks super fucking expensive. All those specialized valves and gauges and tanks and transfer tanks and rejected etc. Yikes. I get it because CO2 has odd properties but maybe it isn't the best refrigerant. I like the idea but in the deserts... 87 is a nice winter day where you don't really run the AC much. At 115 you'll definitely be using that gas cooler a ton and efficiency sounds like it'd be bad. Wish there was a breakthrough on simplifying this process.
Great video, seems though that energy consumption for the same application compared to HFCs is a lot higher! Should we take that under consideration, not to mention the installation costs.
New into c02 racks would love to get this dudes #. Got couple guys from hill phoenix that are pretty sharp but I’d like to work with this guy for a couple months !
Hug a tree save the world. Been working with couple Hill Phoenix reps and they say c02 is way easier than 448A rack 🙄 haven’t touched c02 YET but I don’t see how
Hi, I am wondering if you could do a study on the vaporizing of CO2 stored in huge CO2 tank for process use. My company uses a lot of CO2 for our process. Liquid CO2 is vaporised using a hot water balh before it could be used. Is there any ways to harvest the chillness from the vaporizing CO2 for used to cool our cooling tower water return?
very very niche market, 99 pct refrigeration guys never touched CO2 system, even most _rack_ ref guys barely worked on these systems, too many potential headaches for my taste
Hello. Great video, very informative. Could you advise on what the primary design criteria for the drop leg pipe size should be? i.e. to achieve a desired velocity or pressure drop between the gas cooler and vessel. Thank you in advance.
Hi, thanks for great video! I have a question - 7:45 shouldn't there be a relief pipe on the discharge of the pressure relief valve? Or where is the relieved refrigerant directed? Thanks
So we're banning freon type refrigerants for CO2 to save the planet but CO2 is a greenhouse Gas that can cause a greenhouse effect. Also adding medium temp compressors in the mix and the power to run those. Please someone correct me if im wrong about any of this?
You don’t add CO2 in the atmosphere when leaking, since CO2 you had charged in your system is already fromm mother nature..... only had been dried and clean before bottle it.
Don’t know if this is to late but can you do something about Co2 ejectors. We’re just about to start receiving packs with this fitted and it’s hard to get a good basic explanation of how they work
Can we take lower condensing temp... like 32 tp 40 foranheat using the cascade refrigration My questiin is vapor co2 convert into liquid co2 at low condensing temperature
Along the video I see some gauges and pressure transducers connected directly to the pipes. How do you replace those without shutting that line off? I have female pressure transducers 1/4” SAE flare and I cannot find a schrader valve rated for R-744. Of course I could use ball valves but the space is limited. Anyone please? Thanks
👍👍👍 yes I can’t wait, Bring it on, I can’t wait I want one at my house just to have a fun toy to play with. Compared to automotive emission systems and drivability and body module systems that’s just the Childs play toy simple easy. I wish one of the big companies can donate one of those systems here in California to Laney College for our HVAC/R program. I will install it for free just for fun. Our young people coming out of the high school entering college for a career in our industry need a lot of help.
With HFCs competing probably not. There would have to be significant reason to use it, such as a dramatic savings in operation cost in those applications.
Ur Danfoss Frequency Changer is a little bit tooo nervous, try to get it as stable as possible. if its changing too much all 2 seconds, ur bitzer is going trash very fast.
Go start a business in a state where unions are strong in the commercial and industrial hvacr field and tell me how much you love unions. Unions are only good if you're in one they're a net negative for literally every one else.
@@averagebloke4474 what part of the country are you in? i think if you call and apply to all your local shops you should be able to find something. Also alot of the schools out there have job postings through the school you graduated at, give it a look brother. Keep applying sooner or later you will find an opening. In the meantime keep learning and going through your books.
Sculpin There’s always work . Plus , refrigeration doesn’t have a season . Try starting off as a maintenance tech . Btw, Heating season up here in the north East is in high demand . That’s the beauty of this industry, there’s plenty of diversity .Good Luck .
Reminds me of computer tutorial video where some guy from India says " click this, then this, then this, then scroll over here, then click this and this, and that's how you do it."
Thank you, fantastic!
THE ABSOLUTE SMARTEST AND INTERESTING GUY IVE EVER HEARD...HOLD MY ATTENTION AND YLUR SMART AZ HELL! APPRECIATE IT
I find it interesting when someone is trying to describe the trans-critical system; there are a lot of terms thrown about when trying to describe the state of the CO2 above the critical point. As said in the video it is neither gas/vapour or liquid. It is a supercritical fluid. A vapour would refer to a gas that is in equilibrium with a liquid phase, liquid is a subcooled state and gas is a superheated state. Supercritical is some kind of hybrid between liquid and gas and has properties of both. There is a mistake in the video to refer to CO2 above the critical point as 'transcritical' - it is not, it is supercritical. The system is transcritical because it operates on pressures that are both above and below the critical point and hence critical pressure. The system works across the critical pressure, hence 'trans' meaning across. 'Super' refers to above - i.e. supercritical is above the critical pressure.
Like the way mercury is a liquid-solid.
Used to have a small Coca Cola cooler for drinks. The Coca Cola company gave it to the restaurant owner. It used Co2 as refrigerant, and leaked. After swapping it with a R134a compressor, it works very good and no leaks any more (Over 2 years now). So high pressure means you have more potential leaks
i disagree. we rarely got any leaks. the most important thing is to use the right components
Awesome! I miss my rack days. Co2 is the new future
Thank you very much for the effort of putting this together, guys! My head is saturated (!) now;) Have to watch it a few times to get it all in. Very interesting! You use a lot of the same components as us europeans, but the electrical standards are quite different.
Wow, very interesting. The polar opposite of elegant simplicity. Rube Goldberg? Must be dramatically more efficient, or it wouldn’t be worth it. I would imagine that the upfront cost is high, and the service call costs will be even higher!
A lot going on there. Don’t deal with co2 but awesome video. He’s a smart mechanic.
Very good thanks much the same system we have now being installed all over the uk in supermarkets
thanks for the video! tough to imagine alot of us would get to see it this up and close with out the video
We have them at our Grocery store I am service tech for. I was amazed how easy these are to work on.
Thanks for all your efforts to provide us more and more technical specs...and knowledge.Alexis from Athens Greece!
Thanks very much. Very useful and helpful for learning materials that are very hard to find and hardly known or understood.
This is the transducer for the transducer thats has another transducer for the main transducer
Looks you got one expensive maintenance nightmare somebody will be married to that stuff .
The reason its called a transcritical rack is because its a cycle when the system goes above critical point co2 becomes a supercritical fluid and it transitions into the transcritical cycle. If you look at a enthalpy diagram we get a better idea of the cycles. Now when the system is below the critical point thus it runs in a subcritical cycle which is what were used to seeing because all other refrigerants have a much higher critical point.
Need two guys when servicing,one guy to work on these co2 systems and one guy to call 911 when a valve blows off and ripps off the first guys head from the 1500 psi of co2
Dave
Thank you & appreciated for sharing about CO2 Refrigeration. Need more further information of that systems such as sub critical system, about pipe thickness, power consumption compared to other systems etc...
Like your shows hope I'll learn more to become 1of the best in the bizz
Thanks guys, excellent overview! Just starting to get into CO2 systems myself.
Absolutely fantastic, great content, love how he explained how the rack works
Super confusing for an old school tech like myself but brilliant all the same, thanks guys for the post, l think l will be watching this a number of times to figure the whole C02 processes, the new techs must be left scratching their heads when it comes to trouble shooting this type of system, I feel like a 1st year apprentice again......
That entire rack looks super fucking expensive. All those specialized valves and gauges and tanks and transfer tanks and rejected etc. Yikes. I get it because CO2 has odd properties but maybe it isn't the best refrigerant. I like the idea but in the deserts... 87 is a nice winter day where you don't really run the AC much. At 115 you'll definitely be using that gas cooler a ton and efficiency sounds like it'd be bad.
Wish there was a breakthrough on simplifying this process.
Man, this looks intimidating from a residential point of view.
Great video, seems though that energy consumption for the same application compared to HFCs is a lot higher! Should we take that under consideration, not to mention the installation costs.
Great question also the fact that it's a big bomb at those pressures
New into c02 racks would love to get this dudes #. Got couple guys from hill phoenix that are pretty sharp but I’d like to work with this guy for a couple months !
Hug a tree save the world. Been working with couple Hill Phoenix reps and they say c02 is way easier than 448A rack 🙄 haven’t touched c02 YET but I don’t see how
Would it be better to have a subcooler to condense the gas into a liquid?
I know of one system in my area and it gives them so much trouble when the temp is in the 90's
Cool,story 🙄
Hi, I am wondering if you could do a study on the vaporizing of CO2 stored in huge CO2 tank for process use.
My company uses a lot of CO2 for our process. Liquid CO2 is vaporised using a hot water balh before it could be used.
Is there any ways to harvest the chillness from the vaporizing CO2 for used to cool our cooling tower water return?
CO2 is not a good Refrigeration System. IMO. Still, a very interesting video. Good work 👍
Great walk through! Thanks. D.
Good job
I think I'll stick to residential, very interesting though, thanks for making this.
I'm interested in the trailer because of videos like these
very very niche market, 99 pct refrigeration guys never touched CO2 system, even most _rack_ ref guys barely worked on these systems, too many potential headaches for my taste
Hello. Great video, very informative. Could you advise on what the primary design criteria for the drop leg pipe size should be? i.e. to achieve a desired velocity or pressure drop between the gas cooler and vessel. Thank you in advance.
Hi, thanks for great video! I have a question - 7:45 shouldn't there be a relief pipe on the discharge of the pressure relief valve? Or where is the relieved refrigerant directed? Thanks
So we're banning freon type refrigerants for CO2 to save the planet but CO2 is a greenhouse Gas that can cause a greenhouse effect. Also adding medium temp compressors in the mix and the power to run those. Please someone correct me if im wrong about any of this?
You don’t add CO2 in the atmosphere when leaking, since CO2 you had charged in your system is already fromm mother nature..... only had been dried and clean before bottle it.
@@alainemerson Hello there! I sat in a class you taught at the Vilter factory, good to see you ;)
R744 co2 has a gwp of 1
Don’t know if this is to late but can you do something about Co2 ejectors. We’re just about to start receiving packs with this fitted and it’s hard to get a good basic explanation of how they work
What kindve oil is used for Co2 and is it very miscable? I do residential but with all the new weed growers ive become interested in Co2 systems.
Thanks make more videos
Can we take lower condensing temp... like 32 tp 40 foranheat using the cascade refrigration
My questiin is vapor co2 convert into liquid co2 at low condensing temperature
thank you sir from France
Great job and video
why is co2 used as a refrigerent? wouldn't it be very inefficient?
MPA is a good way of reading co2 so 1 MPA is 10 bar and so on 👍🏻
Awesome video thank you
Looks Like a Money pit ! Sooooo many parts and pieces to fail. The simpler the better in Refrigeration.
Thats in anything really. The environmentalists are forcing refrigeration in this direction though. Look at it this way youll never be out of a job.
It definitely is, but this is where we are being forced towards. I hate it, but this is coming.
Along the video I see some gauges and pressure transducers connected directly to the pipes. How do you replace those without shutting that line off? I have female pressure transducers 1/4” SAE flare and I cannot find a schrader valve rated for R-744. Of course I could use ball valves but the space is limited. Anyone please? Thanks
I heard there's currently a C02 shortage. Apperently its a by-product in the petroleum industry.
I am not going to complain about the ice cream prices anymore
Great video......
👍👍👍 yes I can’t wait, Bring it on, I can’t wait I want one at my house just to have a fun toy to play with. Compared to automotive emission systems and drivability and body module systems that’s just the Childs play toy simple easy. I wish one of the big companies can donate one of those systems here in California to Laney College for our HVAC/R program. I will install it for free just for fun. Our young people coming out of the high school entering college for a career in our industry need a lot of help.
Thanks for the overview. I wonder if they will be able to simplify these systems for residential.
No. They won't get simpler. But they may get cheaper.
With HFCs competing probably not. There would have to be significant reason to use it, such as a dramatic savings in operation cost in those applications.
Whoa.. Mind Bent....
19:56 so true
hi sir. k 65 Couper pipe using
Wow. IDK ... It d be cool to work on, but probably never going to touch it.
Good
do we still need p trap in c02?
Still need oil return. Oil trap not p trap
Ur Danfoss Frequency Changer is a little bit tooo nervous, try to get it as stable as possible. if its changing too much all 2 seconds, ur bitzer is going trash very fast.
What is the noise, compressors?
Yes
Yeah you're hearing the screw modulate speed. They make a shocking noise hahaha
more kevin lol
whole lot to go wrong here!!
Local 597 here
Go start a business in a state where unions are strong in the commercial and industrial hvacr field and tell me how much you love unions. Unions are only good if you're in one they're a net negative for literally every one else.
What's all the benefits of all these new shenanigans?
GWP - 1. Environmentally friendly.
Probably takes twice the power to run it, but at least it's environmentally friendly.
That just was irritation ... flash tank, it’s a receiver ...yanks 🙄
Hey Bryan can I talk to you more privately I'm having a really hard time getting into the HVAC industry. Thanks
what do you need help with specifically ? have you completed school or enrolled?
@@chrism7275 yeah man I just wasted 3 years of my life going to school I can't even get a job for thanks.
@@averagebloke4474 what part of the country are you in? i think if you call and apply to all your local shops you should be able to find something. Also alot of the schools out there have job postings through the school you graduated at, give it a look brother. Keep applying sooner or later you will find an opening. In the meantime keep learning and going through your books.
@@chrism7275 new Jersey and apparently it's too late mate it's slow season I don't have till the spring.
Sculpin There’s always work . Plus , refrigeration doesn’t have a season . Try starting off as a maintenance tech . Btw, Heating season up here in the north East is in high demand . That’s the beauty of this industry, there’s plenty of diversity .Good Luck .
I am 667th thumbs up, just don't like three sixes
This is officially Japanese to me 😢
Reminds me of computer tutorial video where some guy from India says " click this, then this, then this, then scroll over here, then click this and this, and that's how you do it."