The Engineering Mindset for a 15KW (with PHE) Capacity System , We used TE12 - Orifice 6 ( We didn't consider the Sub-Cooling caused by PHE + we weren't using PHE initially) Effectively System was delivering 10kw ODU with 15KW idu with TE 12 Orifice 6. @ 8psi Suction & 275psig Discharge. 1 system later failed as 2 cyclinders of compressor discharge reed went off, as soon as we enabled PHE,( may be or bcoz of TXV) Question is was the failure because of TE12 during normal Operation or the mismatch of PHE & TXV. Accurate Txv is TE5 Orifice 3. for the system (later as we considered additional Sub-Cooling)?
This channel is amazing, the detail that goes into your animations as you describe these processes is a true gem of a study aid, I am a studying hvac apprentice and I'll be using this material to get this stuff down cold!
This is a wonderful exploration a relatively complicated subject. I am currently replacing a compressor and txv for a home owner. This is a fantastic video to share with him while I complete the repair. Thank you .
Very nice explanation of simple TXV. But would be nice to have quick overview of some variants, like what is the third port on TXV which connects directly to the suction line?
It's the external equalizer line. Big evaporators need externally equalized TXVs because pressure drops considerably inside them, so the equalizing pressure is sourced from the evaporator's outlet rather than from the TXV's outlet.
Great discussion on the function of the bulb...its pretty clear that if the valve gets stuck in the closed position, there will be no cooling even though the refrigerant in the bulb is expanding against the diaphragm (trying to open the valve).
Change of state begins the moment the refrigerant passes through the tx, not just at the end of the evaporator. There is one constant temperature for as long as the refrigerant is changing from liquid to gas.
Super! Fantastic educational explanation. Please add few words about TXV capacity VS system capacity, means to say can it be variable or must be same as system capacity. Thanks
Not sure if you care to know, but around the 2:10 mark, you show a recording of a sensing bulb strapped to the suction line and it’s strapped with two zip ties Obviously it’s still going to sense the temperature off the suction line, but you should use a metal clamp instead because that metal clamp helps distribute the “coldness”-for lack of a better term-evenly around the sensing bulb and not just on the mating surfaces. Not trying to be a know it all. I just assume you like to constantly get new relevant info. Thanks Paul! I’ve almost watched all of your videos
Thank you so much watching this video. I Now understand Automotive type of expansion valve. Although it's very different it's also very similar. The automotive one does not have the capillary tube. It has a high pressure line and low pressure on the same block.
Great explanation of THX with excellent illustrations. But please make the music lower then the narration so that the backround does not dominate speaking.
So basically a higher temperature at the other side of the evaporative coil opens the valve and a cooler temperature closes it. The goal is to keep the refrigerant a gas for the compressor to compress (liquids don't compress) and to keep the system from freezing in an ac unit. So in adjusting tightening the spring lets less refrigerant in thus increasing exit temperature and loosening decreases exit temperature.
Quick question: when you say the expansion valve will open more, you mean there will be more vapor in the flow (higher x value) or less ? If you cooling load is high (low x value), then the temperature after expansion, as well as after evaporation are high. In order to decrease the temperature after evaporator, you should decrease the temperature after expansion, this means you need have flow with high vapor fraction after expansion. Combining this logic and your description, the more expansion valve open indicates more vapor fraction in the flow. Am I right?
Ok, correct me if I'm wrong but in order to get a liquid to the compressor you would have to overfill the system to begin with. A system with the proper amount of refrigerant has to compress it to get it into liquid form to begin with. Once you let the pressure of from say the TXV being wide open, the liquid would simply turn back into a gas and because of no pressure it would just stay in a gas form.
Had a crummy professor for Thermodynamics. They didn’t think it was important to explain how a TXV valve works. After watching this, I have no idea how they could be so obtuse. Understanding how this valve operates is absolutely critical to be able to think about what’s happening with these systems. Screw you professor Patel.
Hi guys. I've got a question. If cooling demand increases and the expansion valve is forced to open more, I guess there would be a reduced pressure drop in the refrigerant, therefore a lower temperature drop. Wouldn't that reduced the cooling capacity in the evaporator?
Yes there would be a pressure drop in which you would also add an “Internal/External Equalizer Line” which with internal could be piped in the suction by drilling a 1/4” hole or around the suction line externally. This would adjust for pressure differential in the system and the sensing bulb would maintain a constant superheat based on cooling demand.
Can you please explain in temperature vs entropy diagram that how there is no entropy change in process 1-2 even when compressor compresses refrigerant? I believe that entropy should increase if any gas is compressed.
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Its said , cap-ughh-larry. overall great video. A1
The Engineering Mindset for a 15KW (with PHE) Capacity System , We used TE12 - Orifice 6 ( We didn't consider the Sub-Cooling caused by PHE + we weren't using PHE initially)
Effectively System was delivering 10kw ODU with 15KW idu with TE 12 Orifice 6. @ 8psi Suction & 275psig Discharge.
1 system later failed as 2 cyclinders of compressor discharge reed went off, as soon as we enabled PHE,( may be or bcoz of TXV)
Question is was the failure because of TE12 during normal Operation or the mismatch of PHE & TXV.
Accurate Txv is TE5 Orifice 3. for the system (later as we considered additional Sub-Cooling)?
Is Thermostatic expansion valve principle the same with Direct Cooling Technology?
The Engineering Mindset what happened to your VRF videos? I can't find them
New VRF unit video here:➡️ th-cam.com/video/4i1XgcP1tmw/w-d-xo.html
I literally jumped when that compressor in animation, exploded 🤣
Same
same here lol
Same here
Smae
Hahaha me 2
This channel is amazing, the detail that goes into your animations as you describe these processes is a true gem of a study aid, I am a studying hvac apprentice and I'll be using this material to get this stuff down cold!
no pun intended??
How've you gotten on with the apprenticeship? Fully qualified now??
Recently got into the commercial refrigeration trade. Been watching your videos since I started. I appreciate all the info really helpful
I have watched videos from dedicated hvac techs and I was still confused. You explained it perfectly. Thank you
This is a wonderful exploration a relatively complicated subject. I am currently replacing a compressor and txv for a home owner. This is a fantastic video to share with him while I complete the repair. Thank you .
Wow, absolutely high quality stuff. The level of details, clear narrative and even background music... Good job and tons of thanks!
Got my SV Second Engineer oral exam next month and these videos are a godsend! Thank you!
Very well explained and highly informative.
Compressor damage/ explosion due to liquid entry is worth the highlight.
nice. i was dozing off near the end of the vid....suddenly "BOOM"... good one!
Haha! Me too.
Exactly lol
That got me😂
hahaha yep, now I'm awake lol
Same here! Lol 😂
Great simple video explaining the process for someone who is not an HVAC tech. Thanks.
Organized and detailed explanation, i like the analogy and circled appointed equipment when the narrator speaks
Very nice explanation of simple TXV. But would be nice to have quick overview of some variants, like what is the third port on TXV which connects directly to the suction line?
It's the external equalizer line. Big evaporators need externally equalized TXVs because pressure drops considerably inside them, so the equalizing pressure is sourced from the evaporator's outlet rather than from the TXV's outlet.
This is the best video I’ve seen explaining the TXV. Thank you 👍🏼
Great discussion on the function of the bulb...its pretty clear that if the valve gets stuck in the closed position, there will be no cooling even though the refrigerant in the bulb is expanding against the diaphragm (trying to open the valve).
I went from 😴 to 👀 when compressor exploded. Well animated video, for those new hvac techs 👍
Change of state begins the moment the refrigerant passes through the tx, not just at the end of the evaporator. There is one constant temperature for as long as the refrigerant is changing from liquid to gas.
That Jump Scare Explosion.
I thought I was the only one XD
I use a Denon amp for my pc.
I almost threw my mouse across the room!
This is a great video for understanding the importance of TXV and its working principle.
This is the best one on AC systems. Thank you !
Superb! Very helpful for people like me who are venturing out into this field:
ie- Marine engineering.
Will you please do one on steering system
Who the hell thumbs down solid material such as this!? People take time to make such videos that help thousands and you get such d***s out there 😒
Thank you very much.You made a very clear explanation about refrigeration system
Super! Fantastic educational explanation. Please add few words about TXV capacity VS system capacity, means to say can it be variable or must be same as system capacity. Thanks
That explosion almost knocked me out of my chair haha.
Not sure if you care to know, but around the 2:10 mark, you show a recording of a sensing bulb strapped to the suction line and it’s strapped with two zip ties
Obviously it’s still going to sense the temperature off the suction line, but you should use a metal clamp instead because that metal clamp helps distribute the “coldness”-for lack of a better term-evenly around the sensing bulb and not just on the mating surfaces.
Not trying to be a know it all. I just assume you like to constantly get new relevant info. Thanks Paul! I’ve almost watched all of your videos
Thanks Josh, nice tip.
I was waiting for you to tell us how to know if the super heat setting is right or wrong and why and what to do about it.
Well said you really summed up the entire information from the beginning of your video in your example. Thank you.
Thank you so much watching this video. I Now understand Automotive type of expansion valve. Although it's very different it's also very similar. The automotive one does not have the capillary tube. It has a high pressure line and low pressure on the same block.
Yes, we have a video on EEV also please check our page
This simplified so that anyone can understand thank you
Great explanation of THX with excellent illustrations. But please make the music lower then the narration so that the backround does not dominate speaking.
Compressor spontaneous disassembly was a good chuckle, thank you. :D
These are the best videos I've seen on TH-cam. 👍 Thanks
So basically a higher temperature at the other side of the evaporative coil opens the valve and a cooler temperature closes it. The goal is to keep the refrigerant a gas for the compressor to compress (liquids don't compress) and to keep the system from freezing in an ac unit. So in adjusting tightening the spring lets less refrigerant in thus increasing exit temperature and loosening decreases exit temperature.
Turn up the volume when you're recording your videos thanks man. Thanks for the video
Lol
Finally, got it, thanks for sharing!
nice always wondered what they did thanks for sharing
Had watched this once before, forgot the thumbs up; got it right this time around.
Marvelous explanation.. no more word to say
Quick question: when you say the expansion valve will open more, you mean there will be more vapor in the flow (higher x value) or less ? If you cooling load is high (low x value), then the temperature after expansion, as well as after evaporation are high. In order to decrease the temperature after evaporator, you should decrease the temperature after expansion, this means you need have flow with high vapor fraction after expansion. Combining this logic and your description, the more expansion valve open indicates more vapor fraction in the flow. Am I right?
This is intimidating knowledge. Is this a necessity when getting started with installs?
That explosion made me jump. Lol.
Marvelous explained but back sounds little bit irritating. Keep up good work
this guy is an amazing teacher 😇😎🤓
I flinched when that compressor blew up. was trying to sleep there
Thank you for this video, I wish you put more about comercial refrigeration.
that compressor explosion almost got mee
7:42 scared the Bejeebers out of me.
Superb explanation. Thanks
Good explanation of the system. Thanks
excellent graphics and good explainations
7:37 I didnt know compressors had emotion. LOL
Awesome, clear and concise, if you could, slow down the music, thank you so much
that explosion got me😂
Ok, correct me if I'm wrong but in order to get a liquid to the compressor you would have to overfill the system to begin with. A system with the proper amount of refrigerant has to compress it to get it into liquid form to begin with. Once you let the pressure of from say the TXV being wide open, the liquid would simply turn back into a gas and because of no pressure it would just stay in a gas form.
Thank you for this very understanding information.
Could you please explain about the equalising line? Why is it required? How it works?
He just told you
Thanxs more we follow ur video always from Iraq
Great explanation and thank you!!❤❤
I just love your videos, man! Thanks!
mahn that compressor explosion made me flinch so bad.....
Had a crummy professor for Thermodynamics. They didn’t think it was important to explain how a TXV valve works. After watching this, I have no idea how they could be so obtuse. Understanding how this valve operates is absolutely critical to be able to think about what’s happening with these systems. Screw you professor Patel.
Great Geat video !! Helped me a lot !
lovely videos...keep ur efforts continued.
I learned so much.thank you sir.
The freon doesn’t carry heat to the compressor. The compressor compresses freon which cause it to get hot.
This is great. Thanks for your educational videos. Alot of thanks.
Wow! Very well explained. Thank you.
Great explaination.... Thank you
Thanks in a million. Great content. Awesome. Grade: A++💥
Hi guys. I've got a question. If cooling demand increases and the expansion valve is forced to open more, I guess there would be a reduced pressure drop in the refrigerant, therefore a lower temperature drop. Wouldn't that reduced the cooling capacity in the evaporator?
the bulb is measuring the superheat at the outlet
Yes there would be a pressure drop in which you would also add an “Internal/External Equalizer Line” which with internal could be piped in the suction by drilling a 1/4” hole or around the suction line externally. This would adjust for pressure differential in the system and the sensing bulb would maintain a constant superheat based on cooling demand.
great video/animation and explanation; background music is a bit loud and distracting
Can you please explain in temperature vs entropy diagram that how there is no entropy change in process 1-2 even when compressor compresses refrigerant? I believe that entropy should increase if any gas is compressed.
Thank you so much 💓 for this inriched informative video
Awesome explanation . Thanks a lot 😊👍🏻
Perfect explanation 👌 👏 👍
Very helpful, thank you very much
Excellent video, Is it possible to close TXV completely to stop the liquid refrigerant flow to the compressor when the load on equipment is very low.
Thanks
Excellent video!!
WOW good teaching for me..
what happens with the pressure inside the evaporator when more liquid is injected? thank you nice videos
A question in the C&G Exam was relating to Wet Bulbs and Capillary Action. Now i can see the light.
The explosion at the end is scary. Don't let it happen to your compressor.😁
Very Educative. Thanks
Best explanation! Very quality picture!)
Nice explanation.
Thank you for the best explanation ever....
Great video as always.
Bro that explosion scared the shit out of me
Thanks for the video! Except for the loud explosion sound effect :( scared the heck out of me.
Good explanation
Awesome video! Thank you!
I come in here because my teacher 👍
That kaboom sound effect took my breath
A very well understanding,thank u
great video...thanks so much
Dear sir can you make a video on electronic expansion valve please
Here you go: th-cam.com/video/XHtRHiKIsEU/w-d-xo.html
Very good info.
Now I know what that thing is, the sensing bulb!