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 .
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.
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 explanation of THX with excellent illustrations. But please make the music lower then the narration so that the backround does not dominate speaking.
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
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.
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
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?
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.
Working on a 404a commercial freezer. Thing was at 96 degrees Fahrenheit when I arrived. Compressor was hot. Low pressure was in a vacuum. Would the TEV cause this being that it’s stuck and the pin is restricting flow?
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.
⚠️ *Found this video super useful?* Buy Paul a coffee to say thanks: ☕
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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:➡️ ruclips.net/video/4i1XgcP1tmw/видео.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
Got my SV Second Engineer oral exam next month and these videos are a godsend! Thank you!
Wow, absolutely high quality stuff. The level of details, clear narrative and even background music... Good job and tons of thanks!
nice. i was dozing off near the end of the vid....suddenly "BOOM"... good one!
Haha! Me too.
Exactly lol
That got me😂
Same here! Lol 😂
Lmao same here
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 .
Great simple video explaining the process for someone who is not an HVAC tech. Thanks.
This is the best one on AC systems. Thank you !
This is the best video I’ve seen explaining the TXV. Thank you 👍🏼
Very well explained and highly informative.
Compressor damage/ explosion due to liquid entry is worth the highlight.
Organized and detailed explanation, i like the analogy and circled appointed equipment when the narrator speaks
This is a great video for understanding the importance of TXV and its working principle.
This simplified so that anyone can understand thank you
Get your Engineering T-shirts, Hoodies and Xmas jumpers here! tinyurl.com/ydcfcr9n
These are the best videos I've seen on RUclips. 👍 Thanks
*Inside a real TXV* cut open ➡️ ruclips.net/video/HqH1MSWakgo/видео.html
Finally, got it, thanks for sharing!
I went from 😴 to 👀 when compressor exploded. Well animated video, for those new hvac techs 👍
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).
this guy is an amazing teacher 😇😎🤓
Well said you really summed up the entire information from the beginning of your video in your example. Thank you.
Thank you very much.You made a very clear explanation about refrigeration system
Turn up the volume when you're recording your videos thanks man. Thanks for the video
Lol
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!
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.
Marvelous explanation.. no more word to say
Ευχαριστούμε!
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.
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
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.
nice always wondered what they did thanks for sharing
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 😒
Superb explanation. Thanks
Had watched this once before, forgot the thumbs up; got it right this time around.
Good explanation of the system. Thanks
Great Geat video !! Helped me a lot !
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
excellent graphics and good explainations
Compressor spontaneous disassembly was a good chuckle, thank you. :D
Perfect explanation 👌 👏 👍
Thank you for this very understanding information.
Excellent video!!
Great video as always.
That explosion almost knocked me out of my chair haha.
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
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.
Thanxs more we follow ur video always from Iraq
Very Educative. Thanks
Awesome video! Thank you!
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.
Thanks in a million. Great content. Awesome. Grade: A++💥
Great video , thanks 👍
Thank you so much 💓 for this inriched informative video
Marvelous explained but back sounds little bit irritating. Keep up good work
I learned so much.thank you sir.
Amazing explanation
...thanks
I just love your videos, man! Thanks!
Very helpful, thank you very much
This is intimidating knowledge. Is this a necessity when getting started with installs?
lovely videos...keep ur efforts continued.
Awesome, clear and concise, if you could, slow down the music, thank you so much
Very good info.
7:42 scared the Bejeebers out of me.
WOW good teaching for me..
Nice explanation.
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?
Good explanation
A very well understanding,thank u
Awesome explanation . Thanks a lot 😊👍🏻
Great Video!
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.
what happens with the pressure inside the evaporator when more liquid is injected? thank you nice videos
Thanks from Bangladesh.
Best explanation! Very quality picture!)
Wow! Very well explained. Thank you.
great video/animation and explanation; background music is a bit loud and distracting
So is that why you check sub cooling with a TXV system? Im new to this , trying to learn.
Thank you 🙏
Could you please explain about the equalising line? Why is it required? How it works?
He just told you
Nice video.. Thanks
very good👍👍👍👍
Working on a 404a commercial freezer. Thing was at 96 degrees Fahrenheit when I arrived. Compressor was hot. Low pressure was in a vacuum. Would the TEV cause this being that it’s stuck and the pin is restricting flow?
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.
Nice video
Awesome vid!
Excellent video. Keep it up.
How is indoor TXV bypassed in heat mode? does bulb simply open it all the way and size of the line matches size of TXV opening?
7:37 I didnt know compressors had emotion. LOL
Thank you for this video, I wish you put more about comercial refrigeration.
Good clip thanks
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
Love your vids!
Did you mention the function of sensing bulb?
This is great. Thanks for your educational videos. Alot of thanks.
great video...thanks so much