Refrigerants How they work in HVAC systems
video description
Date: 2023-11-17
Related videos
Comments and reviews: 30
Good
I have worked as mechanical engineer for many years for a major petrochemical refinery. among other maintenance areas of Lube and Fuel refineries I was in charge of the FEU unit where and the refrigeration unit was part it to get the wax out. I was also responsible for the centrifugal compressor and was trained to troubleshoot the refrigeration centrifugal compressor doing vibration analysis using Bentley Nevada instruments.
We used to send out the control valves for calibration to the workshop and the instrumentation department would get the requirements from operations for calibration of TXV?
Could u please do a video on calibration of TXV?
Thanks, the video was super interesting
reply
I have worked as mechanical engineer for many years for a major petrochemical refinery. among other maintenance areas of Lube and Fuel refineries I was in charge of the FEU unit where and the refrigeration unit was part it to get the wax out. I was also responsible for the centrifugal compressor and was trained to troubleshoot the refrigeration centrifugal compressor doing vibration analysis using Bentley Nevada instruments.
We used to send out the control valves for calibration to the workshop and the instrumentation department would get the requirements from operations for calibration of TXV?
Could u please do a video on calibration of TXV?
Thanks, the video was super interesting
reply
Vic
This was a nice explaination EXCEPT for two major issues. 1. The refrigerant in State-1 is a superheated vapor and is NOT in its saturation state! If it was, this would pose a problem to the compressor which is a vapor pump. It can not and does not want to see any liquid! 2. Inversly, in State-2, at the output of the condenser, the refrigerant is in a high temperature-high pressure sub-cooled liquid. The refrigerant needs to be 100% sub-cooled liquid when entering the evaporator. This is where you want all of the absorbing of heat going on, not in the liquid line.
reply
This was a nice explaination EXCEPT for two major issues. 1. The refrigerant in State-1 is a superheated vapor and is NOT in its saturation state! If it was, this would pose a problem to the compressor which is a vapor pump. It can not and does not want to see any liquid! 2. Inversly, in State-2, at the output of the condenser, the refrigerant is in a high temperature-high pressure sub-cooled liquid. The refrigerant needs to be 100% sub-cooled liquid when entering the evaporator. This is where you want all of the absorbing of heat going on, not in the liquid line.
reply
richis2fast4u
one thing I still don't get, and can't seem to find, is the limits of refrigeration? For example, why wouldn't you further increase the pressure of the compressor which would increase the temperature of the refrigerant exiting it and afford you more heat to transfer because refrigerant is hotter? I am sure there is a simple reason why they don't just put in a bigger compressor, but I am struggling to find it.
reply
one thing I still don't get, and can't seem to find, is the limits of refrigeration? For example, why wouldn't you further increase the pressure of the compressor which would increase the temperature of the refrigerant exiting it and afford you more heat to transfer because refrigerant is hotter? I am sure there is a simple reason why they don't just put in a bigger compressor, but I am struggling to find it.
reply
ChunYuen
I don't understand. If the refrigerant's boiling point is so low. Then what really makes the refrigerant become liquid again? Moving air alone can't get to minus 26 degree Celsius on its own. So what's dropping the temperature to below minus 26 degree to condensate the refrigerant to liquid form? I must be missing something.
reply
I don't understand. If the refrigerant's boiling point is so low. Then what really makes the refrigerant become liquid again? Moving air alone can't get to minus 26 degree Celsius on its own. So what's dropping the temperature to below minus 26 degree to condensate the refrigerant to liquid form? I must be missing something.
reply
Delano
Phenomenal explanation! You just helped me turn months of confusion, uncertainty and anxiety into understanding. I realize that the information I was being taught was indeed correct, but somehow since I am not working in the field, I was unable to connect the dots to understand as I do now. Thank You very much!
reply
Phenomenal explanation! You just helped me turn months of confusion, uncertainty and anxiety into understanding. I realize that the information I was being taught was indeed correct, but somehow since I am not working in the field, I was unable to connect the dots to understand as I do now. Thank You very much!
reply
Randy
How do we turn the refrigerant into a liquid again if there's nowhere to get the temperature below the boiling point of the refrigerant? Is it because of the pressure in the system between the compressor and the expansion valve increasing the boiling point of the refrigerant?
reply
How do we turn the refrigerant into a liquid again if there's nowhere to get the temperature below the boiling point of the refrigerant? Is it because of the pressure in the system between the compressor and the expansion valve increasing the boiling point of the refrigerant?
reply
bnd402
so correct me if i'm wrong but long story short, the refrigerant gets heated up (pressurized, all that heat is blown outside to make it easier to cool down when its depressurized, then once its depressurized, it passes across another fan that blows cooled air inside?
reply
so correct me if i'm wrong but long story short, the refrigerant gets heated up (pressurized, all that heat is blown outside to make it easier to cool down when its depressurized, then once its depressurized, it passes across another fan that blows cooled air inside?
reply
Raul
So, Ive looked at about four different videos trying to figure out how refrigerants work and they have all left me with more questions than answers. Your video was actually the first one where I felt like I totally understood what a refrigerant is. Thanks a lot mate!
reply
So, Ive looked at about four different videos trying to figure out how refrigerants work and they have all left me with more questions than answers. Your video was actually the first one where I felt like I totally understood what a refrigerant is. Thanks a lot mate!
reply
showspotter
so does the boiling point rise with the higher pressure? i thought 410a boiled above -50-60F, so if it leaves the compressor, it would seem like it would most definitely be a vapor, unless the increased pressure makes that boiling point rise substantially.
reply
so does the boiling point rise with the higher pressure? i thought 410a boiled above -50-60F, so if it leaves the compressor, it would seem like it would most definitely be a vapor, unless the increased pressure makes that boiling point rise substantially.
reply
Honest
The emf generated by the external energy, separates charge carrier (electron) from the atom of copper coil in generator similarly the energy breaks the atom of refregerent to make it vapor and hence the liquid becomes somewhat cooler. Thanks from BD.
reply
The emf generated by the external energy, separates charge carrier (electron) from the atom of copper coil in generator similarly the energy breaks the atom of refregerent to make it vapor and hence the liquid becomes somewhat cooler. Thanks from BD.
reply
Pascal
The Compressor compresses from state 1 to 2, and increases pressure, and temperature. Yet the (T, s) graph on the top left shows that the transformation 1 to 2 is isothermal (T is constant. Is the (T, s) graph wrong? Sorry if I missed something.
reply
The Compressor compresses from state 1 to 2, and increases pressure, and temperature. Yet the (T, s) graph on the top left shows that the transformation 1 to 2 is isothermal (T is constant. Is the (T, s) graph wrong? Sorry if I missed something.
reply
Germaine
probably a dumb question due to the fact that i have never seen anyone replace the refrigerant in any of these devices but that would mean the refrigerant you use would be sort of recycled? this gas does not run out that you have to replace?
reply
probably a dumb question due to the fact that i have never seen anyone replace the refrigerant in any of these devices but that would mean the refrigerant you use would be sort of recycled? this gas does not run out that you have to replace?
reply
Mr
So refrigerant allows you to go from a liquid to a vapor at a lower temperature. water boils at 212F so as with water versus refrigerant which boils at a much lower temperature. .liquid/vapor this video is good the vapor carries away the heat
reply
So refrigerant allows you to go from a liquid to a vapor at a lower temperature. water boils at 212F so as with water versus refrigerant which boils at a much lower temperature. .liquid/vapor this video is good the vapor carries away the heat
reply
Zack
Came to this video with a question Could A/Cs potentially operate without the use of refrigerant with the same efficiency? I'm no mechanical engineer or HVAC Engineer but I hope this sparks curiosity in someone somewhere.
reply
Came to this video with a question Could A/Cs potentially operate without the use of refrigerant with the same efficiency? I'm no mechanical engineer or HVAC Engineer but I hope this sparks curiosity in someone somewhere.
reply
Good
Refrigerant also condenses at higher temperature at higher pressure and it facilitates dumping out heat just like it evaporates at lower temperature at lower pressure and it facilitated absorption of heat?
reply
Refrigerant also condenses at higher temperature at higher pressure and it facilitates dumping out heat just like it evaporates at lower temperature at lower pressure and it facilitated absorption of heat?
reply
Luke
It's worth mentioning that the vapor entering the compressor is superheated, and the liquid entering the TEV is sub-cooled. Remember folks condensers reject latent heat and evaporators absorb latent heat.
reply
It's worth mentioning that the vapor entering the compressor is superheated, and the liquid entering the TEV is sub-cooled. Remember folks condensers reject latent heat and evaporators absorb latent heat.
reply
Wild
i don't get how something which boils at -55F turns to liquid at temps greater than -55F. I understand how it can flash off and turn into super heat but from super heat to liquid has me confused.
reply
i don't get how something which boils at -55F turns to liquid at temps greater than -55F. I understand how it can flash off and turn into super heat but from super heat to liquid has me confused.
reply
PewPew
Wait tye teftigerant needs to be in high temp for the heat to transfer?
How does that work?
I'm really confused about this topic specifically the whole ac system so please enlighten me
reply
Wait tye teftigerant needs to be in high temp for the heat to transfer?
How does that work?
I'm really confused about this topic specifically the whole ac system so please enlighten me
reply
0000
6: 57
the pressure does not decrease in the cans
the liquid absorb some heat to become gas and maintain the pressure
the pressure will decrease only when there is no liquid in the can
reply
6: 57
the pressure does not decrease in the cans
the liquid absorb some heat to become gas and maintain the pressure
the pressure will decrease only when there is no liquid in the can
reply
Honest
We can make industries but the citizens, politicians and bureaucrats are utterly corrupted in Bangladesh. So I don't dare to make and to run the business on it. Thanks from Bangladesh.
reply
We can make industries but the citizens, politicians and bureaucrats are utterly corrupted in Bangladesh. So I don't dare to make and to run the business on it. Thanks from Bangladesh.
reply
Joseph
Thank you so much. Yours is an excellent description of the processes and the sciences behind each stage by explaining it with familiar examples like boiling water and spray can.
reply
Thank you so much. Yours is an excellent description of the processes and the sciences behind each stage by explaining it with familiar examples like boiling water and spray can.
reply
Suspended
So I've also watched 4 other videos but about how to skin a deer. This video didn't help on deer advice. Oh, but I learned compressors and evaporators.
reply
So I've also watched 4 other videos but about how to skin a deer. This video didn't help on deer advice. Oh, but I learned compressors and evaporators.
reply
A.
Sir need is to see that to do with the water 7 big tanks and let out 2 inch pipe pressurize for process to be run by 24 hourse and water out 90c electrical
reply
Sir need is to see that to do with the water 7 big tanks and let out 2 inch pipe pressurize for process to be run by 24 hourse and water out 90c electrical
reply
Jordan
13, 995 subs back in 2017 (1: 46) to now 2. 17M. That wasn't earned by making trendy videos either, well deserved. Thank you for these videos!
reply
13, 995 subs back in 2017 (1: 46) to now 2. 17M. That wasn't earned by making trendy videos either, well deserved. Thank you for these videos!
reply
Moses
Could you go more into detail for the evaporator stage. Everything makes sense and was easy to understand until the evaporator cycle
reply
Could you go more into detail for the evaporator stage. Everything makes sense and was easy to understand until the evaporator cycle
reply
username
Are there some systems at all that use a turbine instead of an expansion valve? Is it only like a 5% energy return or something?
reply
Are there some systems at all that use a turbine instead of an expansion valve? Is it only like a 5% energy return or something?
reply
Pillsberry
confused on how the refrigerant turns back into a liquid if the boiling point is such a low temp just by blowing it with a fan?
reply
confused on how the refrigerant turns back into a liquid if the boiling point is such a low temp just by blowing it with a fan?
reply
Cameron
as a civil engineer who always hated this stuff, being forced to recently understand it, the videos you make are super helpful.
reply
as a civil engineer who always hated this stuff, being forced to recently understand it, the videos you make are super helpful.
reply
sekar
Hi, what determines the Suction pressure (Evaporating temperature) & Discharge pressure (Condensing temperature) of refrigerant?
reply
Hi, what determines the Suction pressure (Evaporating temperature) & Discharge pressure (Condensing temperature) of refrigerant?
reply
CHARLES
I feel like collecting all my likes on other videos on this subject and placing them here
Very clear and easy eXplanation
reply
I feel like collecting all my likes on other videos on this subject and placing them here
Very clear and easy eXplanation
reply
Add a review, comment
Other channel videos
