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 .
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.
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 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).
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.
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.
Great explanation of THX with excellent illustrations. But please make the music lower then the narration so that the backround does not dominate speaking.
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
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?
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
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.
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.
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.
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?
Working principle of TXV: TXV controls the volume of refrigerant flow. Volume of refrigerant passing affects pressure. Narrower means lower volume and less pressure and cooler. This will decrease strength of bonds (ectothermic) and give away heat, resulting in cooler and gaseous state
⚠️ *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
Recently got into the commercial refrigeration trade. Been watching your videos since I started. I appreciate all the info really helpful
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??
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!
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
Wow, absolutely high quality stuff. The level of details, clear narrative and even background music... Good job and tons of thanks!
Great simple video explaining the process for someone who is not an HVAC tech. Thanks.
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 .
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.
This is the best one on AC systems. Thank you !
Very well explained and highly informative.
Compressor damage/ explosion due to liquid entry is worth the highlight.
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 the best video I’ve seen explaining the TXV. Thank you 👍🏼
This is a great video for understanding the importance of TXV and its working principle.
This simplified so that anyone can understand thank you
Organized and detailed explanation, i like the analogy and circled appointed equipment when the narrator speaks
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
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 😒
Had watched this once before, forgot the thumbs up; got it right this time around.
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).
Turn up the volume when you're recording your videos thanks man. Thanks for the video
Lol
7:42 scared the Bejeebers out of me.
These are the best videos I've seen on RUclips. 👍 Thanks
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
That explosion almost knocked me out of my chair haha.
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.
Ευχαριστούμε!
Thank you!
this guy is an amazing teacher 😇😎🤓
Finally, got it, thanks for sharing!
7:37 I didnt know compressors had emotion. LOL
Marvelous explanation.. no more word to say
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.
Compressor spontaneous disassembly was a good chuckle, thank you. :D
nice always wondered what they did thanks for sharing
Great explanation of THX with excellent illustrations. But please make the music lower then the narration so that the backround does not dominate speaking.
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.
That explosion made me jump. Lol.
excellent graphics and good explainations
Superb explanation. Thanks
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
Good explanation of the system. Thanks
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.
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?
Thank you for this very understanding information.
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
Great Geat video !! Helped me a lot !
Marvelous explained but back sounds little bit irritating. Keep up good work
Thanks in a million. Great content. Awesome. Grade: A++💥
Thanxs more we follow ur video always from Iraq
Could you please explain about the equalising line? Why is it required? How it works?
He just told you
i fall in love with danfiss since 1993
Awesome, clear and concise, if you could, slow down the music, thank you so much
Perfect explanation 👌 👏 👍
Thank you so much 💓 for this inriched informative 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.
Very Educative. Thanks
Excellent video!!
Great video as always.
Very helpful, thank you very much
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.
lovely videos...keep ur efforts continued.
WOW good teaching for me..
I learned so much.thank you sir.
This is intimidating knowledge. Is this a necessity when getting started with installs?
what happens with the pressure inside the evaporator when more liquid is injected? thank you nice videos
Amazing explanation
...thanks
Awesome video! Thank you!
So is that why you check sub cooling with a TXV system? Im new to this , trying to learn.
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 explanation.
This is great. Thanks for your educational videos. Alot of thanks.
Great video , thanks 👍
I come in here because my teacher 👍
I flinched when that compressor blew up. was trying to sleep there
A very well understanding,thank u
Best explanation! Very quality picture!)
Hello sir
Can you show about how oil pressure switch are woks
Seen our new pressure switch video? Link: ruclips.net/video/YG81w0HFXNc/видео.html
Good explanation
I just love your videos, man! Thanks!
Very good info.
that explosion got me😂
great video...thanks so much
Awesome explanation . Thanks a lot 😊👍🏻
Danfoss expansion valve number 1
That kaboom sound effect took my breath
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.
Question the inlet/outlet of the TXV...is it inlet from the condenser and outlet to the evaporator
Yes, but always check the manufacturers notes for the model you're installing
Did you mention the function of sensing bulb?
In some designs we have a feedback acting from downwards! Please include the explanation for the same
Great Video!
Thank you for this video, I wish you put more about comercial refrigeration.
Why the capillary tube is coiled at the top of the valve? Is it just to add buffer length or does it have some function?
Now I know what that thing is, the sensing bulb!
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?
Working principle of TXV: TXV controls the volume of refrigerant flow. Volume of refrigerant passing affects pressure. Narrower means lower volume and less pressure and cooler. This will decrease strength of bonds (ectothermic) and give away heat, resulting in cooler and gaseous state
Thanks from Bangladesh.