How TXV works - Thermostatic expansion valve working principle, HVAC Basics vrv heat pump

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  • เผยแพร่เมื่อ 22 ธ.ค. 2024

ความคิดเห็น • 394

  • @EngineeringMindset
    @EngineeringMindset  7 ปีที่แล้ว +49

    ⚠️ *Found this video super useful?* Buy Paul a coffee to say thanks: ☕
    PayPal: www.paypal.me/TheEngineerinMindset

    • @desertfox4273
      @desertfox4273 6 ปีที่แล้ว +3

      Its said , cap-ughh-larry. overall great video. A1

    • @balajichandrasekaran6312
      @balajichandrasekaran6312 6 ปีที่แล้ว +1

      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)?

    • @Ednel
      @Ednel 6 ปีที่แล้ว +1

      Is Thermostatic expansion valve principle the same with Direct Cooling Technology?

    • @fokuspimp360
      @fokuspimp360 5 ปีที่แล้ว

      The Engineering Mindset what happened to your VRF videos? I can't find them

    • @EngineeringMindset
      @EngineeringMindset  2 ปีที่แล้ว

      New VRF unit video here:➡️ th-cam.com/video/4i1XgcP1tmw/w-d-xo.html

  • @landolorean51
    @landolorean51 5 ปีที่แล้ว +38

    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!

    • @middy774
      @middy774 2 ปีที่แล้ว +1

      no pun intended??

    • @jonnywilson9117
      @jonnywilson9117 ปีที่แล้ว +1

      How've you gotten on with the apprenticeship? Fully qualified now??

  • @joseojeda4397
    @joseojeda4397 4 ปีที่แล้ว +8

    Recently got into the commercial refrigeration trade. Been watching your videos since I started. I appreciate all the info really helpful

  • @hassan5044
    @hassan5044 4 ปีที่แล้ว +201

    I literally jumped when that compressor in animation, exploded 🤣

  • @yechris2001
    @yechris2001 3 ปีที่แล้ว +19

    I have watched videos from dedicated hvac techs and I was still confused. You explained it perfectly. Thank you

  • @buttonman6262
    @buttonman6262 10 หลายเดือนก่อน

    Got my SV Second Engineer oral exam next month and these videos are a godsend! Thank you!

  • @eaf2k
    @eaf2k 2 ปีที่แล้ว +5

    Wow, absolutely high quality stuff. The level of details, clear narrative and even background music... Good job and tons of thanks!

  • @ginodimarco1153
    @ginodimarco1153 6 หลายเดือนก่อน

    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 .

  • @richsellskc
    @richsellskc 6 ปีที่แล้ว +63

    nice. i was dozing off near the end of the vid....suddenly "BOOM"... good one!

    • @Sardy540
      @Sardy540 5 ปีที่แล้ว

      Haha! Me too.

    • @snow7912
      @snow7912 5 ปีที่แล้ว

      Exactly lol

    • @gauravladha5465
      @gauravladha5465 5 ปีที่แล้ว +1

      That got me😂

    • @andresl2785
      @andresl2785 5 ปีที่แล้ว

      Same here! Lol 😂

    • @Gsantos318
      @Gsantos318 4 ปีที่แล้ว

      Lmao same here

  • @jpjpjp5847
    @jpjpjp5847 4 ปีที่แล้ว +2

    Great simple video explaining the process for someone who is not an HVAC tech. Thanks.

  • @maxxsmaxx1901
    @maxxsmaxx1901 5 ปีที่แล้ว +6

    This is the best one on AC systems. Thank you !

  • @danielesteves3435
    @danielesteves3435 3 ปีที่แล้ว +2

    This is the best video I’ve seen explaining the TXV. Thank you 👍🏼

  • @bala14321
    @bala14321 4 ปีที่แล้ว +6

    Very well explained and highly informative.
    Compressor damage/ explosion due to liquid entry is worth the highlight.

  • @airlanggaariopamungkas8494
    @airlanggaariopamungkas8494 5 หลายเดือนก่อน

    Organized and detailed explanation, i like the analogy and circled appointed equipment when the narrator speaks

  • @michaelatkinson4434
    @michaelatkinson4434 6 ปีที่แล้ว +7

    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.

  • @xiaomingzou8110
    @xiaomingzou8110 7 ปีที่แล้ว +4

    This is a great video for understanding the importance of TXV and its working principle.

  • @macabre19
    @macabre19 3 ปีที่แล้ว

    These are the best videos I've seen on TH-cam. 👍 Thanks

  • @patrickdanga7118
    @patrickdanga7118 2 ปีที่แล้ว

    This simplified so that anyone can understand thank you

  • @bodegadiescast305
    @bodegadiescast305 3 ปีที่แล้ว +4

    I went from 😴 to 👀 when compressor exploded. Well animated video, for those new hvac techs 👍

  • @AvianFlight
    @AvianFlight 6 ปีที่แล้ว +99

    That Jump Scare Explosion.

    • @ibrahimabuadas9268
      @ibrahimabuadas9268 4 ปีที่แล้ว

      I thought I was the only one XD

    • @Rickey904
      @Rickey904 4 ปีที่แล้ว

      I use a Denon amp for my pc.

    • @Dartheomus
      @Dartheomus 4 ปีที่แล้ว

      I almost threw my mouse across the room!

  • @RoyIniguez
    @RoyIniguez 6 ปีที่แล้ว +4

    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.

    • @EngineeringMindset
      @EngineeringMindset  6 ปีที่แล้ว

      Yes, we have a video on EEV also please check our page

  • @Yourengineeringstandpt
    @Yourengineeringstandpt 6 ปีที่แล้ว +4

    Turn up the volume when you're recording your videos thanks man. Thanks for the video

  • @maysaraabdo5339
    @maysaraabdo5339 4 ปีที่แล้ว +2

    Well said you really summed up the entire information from the beginning of your video in your example. Thank you.

  • @avinashkanesen53
    @avinashkanesen53 6 ปีที่แล้ว +2

    Thank you very much.You made a very clear explanation about refrigeration system

  • @anthonymanson4855
    @anthonymanson4855 3 ปีที่แล้ว +2

    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).

  • @moatazanwar6564
    @moatazanwar6564 6 ปีที่แล้ว +12

    Finally, got it, thanks for sharing!

  • @james77011
    @james77011 2 ปีที่แล้ว

    this guy is an amazing teacher 😇😎🤓

  • @DellAnderson
    @DellAnderson 6 ปีที่แล้ว +3

    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?

    • @teravolt6113
      @teravolt6113 5 ปีที่แล้ว +2

      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.

  • @Daluke61
    @Daluke61 4 ปีที่แล้ว +1

    Had watched this once before, forgot the thumbs up; got it right this time around.

  • @md.abulbashar1820
    @md.abulbashar1820 6 ปีที่แล้ว +2

    Marvelous explanation.. no more word to say

  • @saluteyanomaly7628
    @saluteyanomaly7628 4 ปีที่แล้ว +1

    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?

  • @lifehealthandhappiness5661
    @lifehealthandhappiness5661 ปีที่แล้ว

    Perfect explanation 👌 👏 👍

  • @bikerbobcat
    @bikerbobcat 4 ปีที่แล้ว +1

    Compressor spontaneous disassembly was a good chuckle, thank you. :D

  • @ΗλίαςΦασουλάς-π8γ
    @ΗλίαςΦασουλάς-π8γ ปีที่แล้ว

    Ευχαριστούμε!

  • @JW-qp5uf
    @JW-qp5uf 2 ปีที่แล้ว +1

    That explosion almost knocked me out of my chair haha.

  • @guysmileyjr.9482
    @guysmileyjr.9482 3 ปีที่แล้ว

    excellent graphics and good explainations

  • @obioger
    @obioger 6 ปีที่แล้ว +2

    Great Geat video !! Helped me a lot !

  • @johnelicker3967
    @johnelicker3967 3 ปีที่แล้ว +1

    nice always wondered what they did thanks for sharing

  • @pipi7731
    @pipi7731 ปีที่แล้ว

    Good explanation of the system. Thanks

  • @mikechiodetti4482
    @mikechiodetti4482 2 ปีที่แล้ว

    Thank you for this very understanding information.

  • @tonyl9075
    @tonyl9075 6 ปีที่แล้ว +1

    Excellent video!!

  • @johng5295
    @johng5295 3 ปีที่แล้ว +1

    Thanks in a million. Great content. Awesome. Grade: A++💥

  • @argenismoreno8838
    @argenismoreno8838 4 ปีที่แล้ว

    Great video as always.

  • @fahimasghar6375
    @fahimasghar6375 5 ปีที่แล้ว +1

    Superb explanation. Thanks

  • @Muhammad-Ashfaq2030
    @Muhammad-Ashfaq2030 2 ปีที่แล้ว

    Thank you so much 💓 for this inriched informative video

  • @vikasjha5760
    @vikasjha5760 2 ปีที่แล้ว +1

    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.

  • @paulrozinski1488
    @paulrozinski1488 3 ปีที่แล้ว

    Great video , thanks 👍

  • @WarHammer1989
    @WarHammer1989 6 ปีที่แล้ว +3

    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

  • @loveofkemetify
    @loveofkemetify 6 ปีที่แล้ว +1

    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 😒

  • @larryd9068
    @larryd9068 3 ปีที่แล้ว

    Great explanation of THX with excellent illustrations. But please make the music lower then the narration so that the backround does not dominate speaking.

  • @giftnjagu6470
    @giftnjagu6470 5 ปีที่แล้ว

    Very Educative. Thanks

  • @AJ-et3vf
    @AJ-et3vf 3 ปีที่แล้ว

    Awesome video! Thank you!

  • @davsportal1358
    @davsportal1358 2 ปีที่แล้ว

    I learned so much.thank you sir.

  • @josephmichael308
    @josephmichael308 4 ปีที่แล้ว +2

    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

  • @srzaasrzaa1733
    @srzaasrzaa1733 4 ปีที่แล้ว +2

    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

  • @vendhanmarine1
    @vendhanmarine1 5 ปีที่แล้ว +1

    Could you please explain about the equalising line? Why is it required? How it works?

  • @mns.gh6432
    @mns.gh6432 3 ปีที่แล้ว

    Thanxs more we follow ur video always from Iraq

  • @shaukathayat749
    @shaukathayat749 7 ปีที่แล้ว +9

    lovely videos...keep ur efforts continued.

  • @1965ace
    @1965ace 4 ปีที่แล้ว +1

    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.

  • @JoeLiberalism
    @JoeLiberalism 6 หลายเดือนก่อน

    So is that why you check sub cooling with a TXV system? Im new to this , trying to learn.

  • @aaronwang565
    @aaronwang565 ปีที่แล้ว

    Very helpful, thank you very much

  • @munthasirmi777
    @munthasirmi777 6 ปีที่แล้ว +1

    Nice explanation.

  • @gamewizardks
    @gamewizardks 6 ปีที่แล้ว +16

    7:42 scared the Bejeebers out of me.

  • @jonnyhogarty
    @jonnyhogarty 6 หลายเดือนก่อน

    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?

  • @salomebeshidze8376
    @salomebeshidze8376 ปีที่แล้ว

    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?

  • @Fierant
    @Fierant 4 ปีที่แล้ว

    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?

  • @JL-hw6lo
    @JL-hw6lo 5 ปีที่แล้ว +1

    My sensing bulb broke and there was black stuff in it and the compressor turned off and I can get it to come back on how would I fix it or even rig it for now

  • @osamahaider918
    @osamahaider918 3 ปีที่แล้ว

    Amazing explanation
    ...thanks

  • @carlosportillo8863
    @carlosportillo8863 5 ปีที่แล้ว

    Great Video!

  • @acrepairnearme
    @acrepairnearme 6 ปีที่แล้ว +7

    Best explanation! Very quality picture!)

  • @abhinav7737
    @abhinav7737 3 ปีที่แล้ว

    Very good info.

  • @dongertan3320
    @dongertan3320 6 ปีที่แล้ว +2

    This is great. Thanks for your educational videos. Alot of thanks.

  • @camaconetau
    @camaconetau ปีที่แล้ว

    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.

  • @mohdsafri3883
    @mohdsafri3883 5 ปีที่แล้ว +1

    Awesome explanation . Thanks a lot 😊👍🏻

  • @satratey
    @satratey 4 ปีที่แล้ว

    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.

  • @Froggability
    @Froggability 4 ปีที่แล้ว +1

    What happens when you flip the unit into reverse / heating? What does the TX valve do then?

  • @BhaveshKumar-xx4lu
    @BhaveshKumar-xx4lu 5 ปีที่แล้ว

    Good explanation

  • @texture6
    @texture6 6 ปีที่แล้ว +1

    Question the inlet/outlet of the TXV...is it inlet from the condenser and outlet to the evaporator

    • @EngineeringMindset
      @EngineeringMindset  6 ปีที่แล้ว

      Yes, but always check the manufacturers notes for the model you're installing

  • @budapestprojectytc6002
    @budapestprojectytc6002 6 ปีที่แล้ว +2

    I just love your videos, man! Thanks!

  • @matiasarntzen9060
    @matiasarntzen9060 4 ปีที่แล้ว

    what happens with the pressure inside the evaporator when more liquid is injected? thank you nice videos

  • @Tony123-t8g
    @Tony123-t8g 3 ปีที่แล้ว

    Does the TXV have to be installed close to the evaporator inside the cool room or can it be installed on the outside of the cool room? Does it matter?

  • @cyrusaraza1720
    @cyrusaraza1720 2 ปีที่แล้ว

    Good day Sir. I just want to ask something. I have an upright freezer that I wanted to make the freezing faster. Can I use the TXV, to modify the speed of running refregerant. Thanks in advance for any info.

  • @plataformaaprender9017
    @plataformaaprender9017 5 ปีที่แล้ว

    very good👍👍👍👍

  • @joefajardojr3902
    @joefajardojr3902 4 ปีที่แล้ว

    A very well understanding,thank u

  • @fdggfgdfgd251
    @fdggfgdfgd251 6 ปีที่แล้ว +1

    Is the sensing bulb completely separate from the loop? Or does it tap into it and share the same liqiuid

    • @EngineeringMindset
      @EngineeringMindset  6 ปีที่แล้ว

      Separate

    • @josephjorgensen3282
      @josephjorgensen3282 6 ปีที่แล้ว

      This works like any capillary tub temperature switch as the bulb warms pressure rises this works great on things like pressure washers that also heat the water this way we can read the temps of the pipe but also not have to actually break into the high pressure line

    • @teravolt6113
      @teravolt6113 5 ปีที่แล้ว

      @@EngineeringMindset In automotive H-block type expansion valves the bulb is located inside the suction line connector (the plasticy looking cylinder that you see inside one of the holes on the compressor side of the expansion block).

  • @monor5155
    @monor5155 3 ปีที่แล้ว

    What part in the refrigeration system that is directly responsible in regulating evaporator temperature?

  • @leiladaquil6587
    @leiladaquil6587 2 ปีที่แล้ว

    may i ask if there is any relief valve to absorv excess liquid in case txv failed? this way we can reduce or protect the compressor to be damaged as you said because of gas failed to change phase to vapor?since liquid is incompressible and will stall the pump and eventually damage associated parts.

    • @mtbbiker6401
      @mtbbiker6401 ปีที่แล้ว

      I believe TXVs are designed to close by spring pressure during failure but they don't close completely due to mechanical stop. I suppose it's possible for a TXV to get stuck wide open which might allow liquid back to compressor but probably rare.

  • @evodog2300
    @evodog2300 3 ปีที่แล้ว

    What happens if the capillary tube breaks off the txv? Does that make the clutch on the compressor kick on or off?

  • @Alex-jo2oi
    @Alex-jo2oi 4 ปีที่แล้ว

    This is intimidating knowledge. Is this a necessity when getting started with installs?

  • @al151
    @al151 4 ปีที่แล้ว

    I have a question. Is TXV only changing the liquid mass flowrate of the refrigerant through the TXV since the outlet is a mixture of liquid and vapor, or the total mass flowrate of the refrigerant? The reason that I am asking is that the total mass flowrate of the system should be constant. So the mass flowrate of the refrigerant entering and leaving the TXV should be the same in a closed system. If the TXV is changing the total mass flowrate, then where is all that refrigerant going coming out of the compressor (single speed compressor)?

  • @Natnat_816
    @Natnat_816 3 ปีที่แล้ว

    Did you mention the function of sensing bulb?

  • @cck1496
    @cck1496 6 ปีที่แล้ว +1

    Excellent video. Keep it up.

  • @JDT738126
    @JDT738126 6 ปีที่แล้ว +1

    Awesome vid!

  • @chinusajith1456
    @chinusajith1456 2 ปีที่แล้ว

    Thank you 🙏

  • @TheRouteShow
    @TheRouteShow 6 ปีที่แล้ว +1

    Nice video.. Thanks

  • @md.abulbashar1820
    @md.abulbashar1820 6 ปีที่แล้ว +2

    Marvelous explained but back sounds little bit irritating. Keep up good work

  • @md.azadhossain6940
    @md.azadhossain6940 4 ปีที่แล้ว

    Could you please tell me sensing valve filled by which fluid?

  • @ongjunyong
    @ongjunyong 4 ปีที่แล้ว

    How does the refrigerant get into the sensing bulb?

  • @rajatsrivastava7791
    @rajatsrivastava7791 3 ปีที่แล้ว

    In some designs we have a feedback acting from downwards! Please include the explanation for the same

  • @carlosando9316
    @carlosando9316 3 ปีที่แล้ว +1

    WOW good teaching for me..