Superheat and Subcooling Explained! How to Easily Understand!
ฝัง
- เผยแพร่เมื่อ 28 ส.ค. 2016
- In this HVAC Video, I Explain Superheat and Subcooling in the Refrigeration Cycle to Understand the Operation Easier! I go over how to understand the importance of both Superheat and Subcooling. I go over the refrigeration cycle, where superheat is found and what will happen if a Piston or capillary tube system is overcharged in terms of compressor life. I go over what it means to have a low charge when you have a txv in reference to heat absorption in the evaporator coil as well as other tips! Supervision is needed by a licensed HVAC Tech before doing this as Experience and Apprenticeship garners Wisdom and Safety.
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Superheat = "the temperature increase in vapor form (of the refrigerant?) in the evaporator coil." Because the line temp decreases in the evaporator coil, hence cooling the air. Am I correct ACST?
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٢ةةةة٢٣٢٢٣٣وصص٣و ٤٤٣٤ووو٤٤٣ت٤٤٤٤٤٤٤٤٤٤٤٣٤٣٣٣٣٣٣٣٣يقصف٤٤٤٤٤٤٤٣٣٣٣٣٤٤٣٢٢بقلبي في اشار من هلق بدك تنام قلي انا مو متلك نهار الخميس بدي انا مو متلك نهار الخميس بدي للفيديو في اشار من هلق بدك تنام قلي انا مو متلك نهار الخميس بدي للفيديو في اشار من هلق بدك تنام قلي انا مو متلك نهار تنام قلي انا مو متلك نهار الخميس بدي للفيديو في اشار من هلق بدك تنام قلي انا مو هلق بدك تنام قلي انا مو هلق بدك تنام قلي انا مو متلك نهار الخميس بدي للفيديو في اشار من هلق بدك تنام قلي ى انا انا مو متلك نهار الخميس بدي متلك نهارانا مو متلك نهار الخميس بدي انا مو متلك نهار الخميس بدي انا مو متلك نهار الخميس بدي انا مو متلك نهار الخميس بدي لل ى ى انا مو متلك نهار الخميس بدي الخميس بدي
ااااااحلككببييييييبببببررر ضضض.صة.
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٢ةةةة٢٣٢٢٣٣وصص٣و ٤٤٣٤ووو٤٤٣ت٤٤٤٤٤٤٤٤٤٤٤٣٤٣٣٣٣٣٣٣٣يقصف٤٤٤٤٤٤٤٣٣٣٣٣٤٤٣٢٢بقلبي في اشار من هلق بدك تنام قلي انا مو متلك نهار الخميس بدي انا مو متلك نهار الخميس بدي للفيديو في اشار من هلق بدك تنام قلي انا مو متلك نهار الخميس بدي للفيديو في اشار من هلق بدك تنام قلي انا مو متلك نهار تنام قلي انا مو متلك نهار الخميس بدي للفيديو في اشار من هلق بدك تنام قلي انا مو هلق بدك تنام قلي انا مو هلق بدك تنام قلي انا مو متلك نهار الخميس بدي للفيديو في اشار من هلق بدك تنام قلي ى انا انا مو متلك نهار الخميس بدي متلك نهارانا مو متلك نهار الخميس بدي انا مو متلك نهار الخميس بدي انا مو متلك نهار الخميس بدي انا مو متلك نهار الخميس بدي لل ى ى انا مو متلك نهار الخميس بدي الخميس بدي
To have an instructor that intimately knows his subject matter of expertise is one thing but to have that coupled with the ability to explain its complexities in a way that is readily understood is absolutely golden. If you subscribed, you just struck gold.
I really appreciate your kind words, thank you!
As a current HVAC student I second my instructor even some parts of the system so we can see show and tell plus get some hands on
I'm going for a job interview for a maintenance tech after having been out of the field for awhile and I need to brush up on a lot of this stuff, and your videos are helping immensely. THANKS!!
That's awesome to hear, thanks
@@acservicetechchannel can i join with ur team as a tech
Extremely clear concise information. Must watch video 4 times to absorb it all.
Superheat: Temperature increase in vapor state.
Subcool: Temperature decrease in liquid form.
Thank you!
Thanks Armando!
very helpful. Thanks
Very good broken down in simpler terms
Superheat = Temperature increase of refrigerant, right?
what is temperature subcooled & superheated
This is such an awesome video.. I've been doing HVAC for over 10 years now and the way he explains this is very helpful. Thanks for making awesome videos
A much better explanation than others, breaking down the three states of refrigerant passing thru the coils. Also showing service valves after the condenser and right before the compressor.
I did a trade school 20+ yrs ago, we covered 40hrs on sh/sc. This 8 minute class is like Paul Harvey's and now
the rest of the story . Nice splain
Yeah I'm pretty sure what happened here was the click and light bulb !!!! After having watched countless videos, I was skeptical as to how I would ever be able to understand what these terms were . Thank you so much for an excellent video....my mantra for remembering is - protect
compressor at all costs!!! The comp is on a vapor diet... No liquids!!! TXV reverse....Holy crap I can't believe the simplicity of your clarification.
Yes that is very awesome! Thanks for your note and glad to help Denny!
Thank you for the explanation and breakdown of superheat and subcooling in its simplest form. Very well said. 👍🏿
Thank you!
Thanks, starting my first year apprenticeship and this helps refresh my memory. 👍👍👍
Very Cool, thanks! URA 617!
How are you doing these days? Still in the industry?
5 years latter. any update on your advancement?
This is The Best Video on TH-cam that Explains Super heat and Sub cooling...
Keep up the Great work your doing on Teaching this trade
I just got my universal epa certification and I'm on day three as a technician apprentice this helps a lot!
For a novice you could think of the condenser as the "liquid maker" To make good liquid, you have to make sure it's pure, and the subcooling is a safety factor for that. IE how much extra heat you took out of the freon beyond what was necessary to turn him into a liquid. The evaporator is the "vapor maker" and to make good vapor, you have to make sure it's pure (with no liquid in it) and the safety factor for that is superheat. IE how much extra heat was put in beyond what was necessary to make "low quality" vapor. You really don't want liquid going back to the compressor because that could kill him.
Best channel on youtube. As a new tech this channel is priceless to me.
Thanks for this great video. Very important to understand the concept of superheat and sub-cool
Absolutely, thanks!
WOW. This is an excellent video. I was taught this in school, but this is the best explanation I have heard. Thank you!
Thanks a lot for letting me know Boris!
Best explanation of a fridge circuit and what’s happening in the system I can find, me and my apprentice have both subbed
One of the best videos on TH-cam!! Thank you!!
Thanks a lot Kyle!
Your videos are amazing!!! We have been using some of your videos in our company to help the new people understand. Every week we have training classes
Very cool Steve, thanks for letting me know. Let me know of any questions that come up. Tell them I was asking, thanks!
Yes sir I will, next week they will be doing how to OHM a compressor. How do you feel about NATE? The company I work for is paying for it, but I heard it doesn’t mean anything, it’s just an indication you might know it.
Nate was the thing that helped jump start my progression in the field. I took the heat pump service and install test after my first year in the field. I passed the installation part the first time and the second time a month later I went out and scheduled it on my own and took it on my own time and passed the service part. The company had paid for a review and testing so I took it upon myself to complete the heat pump service on my own time and expense. It was hard for me then because of my lack of time in the field but after getting the heat pump service and install and ac service and install, the company gave me a 4 dollar an hour raise and the owner took notice and started building into me to make me the person I am today. Nate was all part of that growing process so yes go for every cert you can get your hands on for the future, especially if your company has an interest in it and is possibly paying for part of it, thanks Steve!
That’s amazing sir. That’s one of my goals is to teach people I only been in the field for 5 years still have a lot to learn. Thank you sir for taking the time to respond. I will let you know if I run into issues that I don’t understand.
That's awesome Steve, glad to help!
Thanks buddy , you explained the Refrigerant superheat and sub cooling in such a easy way .
Thanks for the learning
Thanks, have you seen some of my newer refrigeration cycle videos with an even better picture of the actual system? Thanks!
Your videos make a lot of sense. Thanks for sharing your knowledge!
Thanks Abraham!
Superb education.... The first to show up on the search results and very appropriate positioning !! Answered exactly the questions in mind in perfect style and context. Subscribed .... Very many thanks :)
That's great, thanks Nick!
Thank you for a simple way to understand it. I think I have subcool and superheat figured out. Now I have to figure out how do I use either to charge a system.
Listened to my HVACR instructor for hours and didn't get it thanks so much!
Thanks Sol Spirit, glad it helped!
Don't feel bad. I never went to AC school, and my boss/trainer/mentor had the DICKENS of a time getting me to understand electricity. Controls were a total mystery to me for a LONG time. And then suddenly everything he'd been explaining to me just came together. Just like a switch. Dark to daylight. I LATER went to many schools. RSES, manufacturers schools and the like. But that initial learning curve was for me almost too steep to climb.
ur a good teacher Mr acservicetech. thank you
I appreciate it David!
been finding for too long and this vid help me a lot, thank you so much
thanks you for putting your time into this video.
you did a great job!
Thanks Peter!
very nicely explained thank you for sharing!!!!!
Thank you!
Hey man good job keep doing what you’re doing and great videos.
Thanks Jonatan!
Nice explanation. What is puzzling me is that I have been monitoring new air-water package heat pumps (on R32) and have been seeing periods zero superheat at the compressor discharge. I thought this was impossible, so have spent quite a bit of time measuring other units, and checking my measurements. I am still puzzled by it, but glean that compressors have recently been developed to accept 'wet' vapour into the compressor. One thing for sure is that COP drops when discharge SH is close to zero. Anyhow, my issue is this.... Is my new heat pump faulty? is the EEV control inferior? Is the EEV control made as cheap as possible ? or is it actually desirable to have a slightly wet suction. The COP on average is very good. I have seen a PH chart plotted with a vertical compression line that goes to a point of no discharge superheat. This is completely new and unknown to me.... any thoughts welcome
A super simple explanation thanks for that.
Thanks Mainely History!
Good stuff. I'm still confused enough where I'm not sure I can explain this correctly to my boss.
But it is the best video about superheat and subcooling! Thank you so much
Brilliant explanation 👏🏻👍🏻
Easy and deeply concept for beginner.
Would overfeeding of refrigerant from your TXV (metering device) cause high superheat?
Very informative, thank you very much!
Thanks Akrom!
Thank you! Very well explained!
Glad to help!
Good explanation.
Thanks so much! Hoping to make contribution in the future.
Thanks a lot Russell YT!
Good explanation well done.
good instructor------SUBSCRIBED!
Check out other ACSERVICETECH videos on the HVACR topics of interest at- th-cam.com/channels/OZR-1IqsAer9wzlvFgb4mA.htmlplaylists?view_as=public
So I just found your channel so far so good I'm trying to so some studying for a ase test thanks for the help I'm gonna visit your site as aell
Awesome Darrell!
Great video! Helped a lot as a refresher for a green guy like me going to an interview
Awesome! Thanks...Really liked your video.
Thanks Ice Cold!
Hey ac service tech. I ran into a problem a couple nights on call. Thought i had a bad expansion valve. Got the new part and peaked the model and serial on evap and condenser and the condenser was a 1.5 ton paired with a 2.5/3 evap coil. I had 22 superheat, 55 deg ssc, line temp was 77, subcool was normal, coil wasnt really sweating that much considering the high humidity levels. Something wasnt right. Technical support insisted this was a matched system. Supply air temp was 77 after half hour operation. Split was 10 deg at most and i had to lower the fan speed to its lowest setting. Does this sound fucked up? Also the evap coil sits on top of a furnace in the basement. So its not sucking in hot attic air if the were a return leak somewhere. Anyway let me know what you think of this.
Excellent. Thanks.
just saying Hi, hope all is good, great video
I was listening to locomotion tango by modern talking today while doing an evap on a rtu today the screws have feet lol!
Nice, thanks and nice to hear from you!
Great Video keep up the good work!!!!!!!!!!!!!!!
Thanks Raymond!
Great video. Thank you!
Thanks James!
is it possible to have a built in gauge next to the evaporator and condenser to check for superheating and subcooling?
Very good lecture!
Thanks Sparky!
Thank you for the video
Very well explained
Thanks Mir!
Nice explanation...thanks.
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Thank you!
so subcooling and superheat are the temp changes WHILE IN the vapor/liquid form?
Hey Mark, subcooling is the temp decrease in liquid directly after the vapor/liquid saturated state when it changes to liquid. Superheat is the temp increase of vapor right after the vapor/liquid saturated state when it turns to a vapor. Also check out this video list. These videos hit those topics home that you are asking about. Thanks -- th-cam.com/play/PLxnHR5_D2ojwbAc7K7DsjuasaDVfJeGSe.html
Hello I am thinking of doing over my ac system, in my country the temp is 90% summer,One TXV has a superheat of 4 and the next 8, would the TXV of 4 produce cooler air than the TXV of 8?, Both has the same part number just one has a lower superheat ?
I hv a 3 ton heatpump txv 20 yrs old, supercool is 14F, superheat is 10F if temp taken at evap vs 13F if taken outside on vapor line, outside was 94F, inside 76F, 1350 cfm on med tap measured low SP @.28 spec is .5 . Should use the superheat of 10F using temp at evap vs higher outside vapor line? How do these sound? l believe good, Thank you, love the channel.
Does higher superheat confirms there will be only vapour in the suction line of compressor?
A bit long-winded but encyclopedic depth. Very informative
3:23 - What is discharge superheat and how is it calculated? The discharge line contains superheated vapor from the compressor outlet to the top of the condenser coil; but, I only recently heard of “discharge superheat” for diagnosis. Any insights?
very well explained
Thanks!
Great job and video
Glad you enjoyed it
Thanks brother, PPl that doesn't like the video just don't watch why you dislike important educational video.
Ha ha yeah maybe, it is ok and thanks for your support!
So you need wetbulb reading for superheat? Just got Field piece probes, will they not give me super heat unless I use the psychrometer…..which I don’t have.
So on the manufacturer's "stat sheet" on my AC (the thing with the serial #, model #, and all the electric specifications) it says "SUBCOOL 9F". I get that "9F" means 9 degrees fahrenheit, but what does this specification mean? That the subcooled state happens with a 9F temp drop in the condensor?
It means that the refrigerant has lowered 9 degrees between where the refrigerant came out of the saturated state in the condenser coil until where it flows through the liquid line service valve. Read the article I wrote on subcooling: www.acservicetech.com/post/the-hvac-subcooling-charging-method-explained
Where should the high side pressure port service valve be fitted when designing a new system and what are the advantages/disadvantages
Of the location of these? Is there a difference is pressure?
For "vessel AC "can I use subcooling metod ?
Great video as always,could you do a video explaining how to use and measure WC with a manometer.
Thanks.
Absolutely I will. I tend to target seasons so soon with the season change I will be doing furnace and gas related items. I plan to do conversions, adjustments, and diffferences between digital and standard manometers. Thanks and I value your input and questions!
+acservicetech Thanks
Thank you!!!
During the phase change in the condenser the refrigerant undertakes a sub cooling effect, as the vapour reaches its saturation point it is sub cooled to 80% Vapour and 20% liquid to allow the system to condense efficiently and thus entering the throttling valve, Tev(Thermostatic Expansion Valvle) or the EEV( Electronic expansion valve). Dropping in both pressure and temperature the refrigerant is 80% liquid and 20% vapour, depending on ambient temperatures and refrigerant type. Entering the Evaporator it is super heated as the refrigerant absorbs heat from the ambient air being drawing over the coil by the fan. Once entering the compressor unless the system has a suction accumulator of course the refrigerant will be Vapour.
He just said that moron
Great Video. Whate happens if you turn on the ac on winter time? does Freon still circulate through the system? Thanks
Yes it would. The system would be so efficient that the evap coil would freeze though due to not having enough heat to absorb while the outdoor unit would be able to reject heat extremely easy. Thanks
hi friend i want to make homemade -30 degree freezer what i need can i use r134a ? and which compressor i need
Merci, excellente vidéo
Thanks Dave!
The wet bulb is that the evap coil sensor?
thanks
So if you have a piston you check the superheat in order to see if the system is low or over charged. Then you use the chart to correct it. But if you have a txv then you only use sub cooling right?
Also in TN the weather goes from 35 to 70 f then back down to 30. Does that mean in order to avoid liquid getting into the compressor the superheat must be adjusted on a daily basis?
check out this refrigeration cycle playlist and look at the basic refrigeration cycle one. This is a heat pump. The charge in the unit does not have to be changed, thanks- th-cam.com/video/ZJR5rDPWLpA/w-d-xo.html
Would you be able to make a video explaining the function of sight glasses and there main purpose ?
I plan on making a video on checking the charge on a walk in refrigerator and I will be going over the function of the sight glass during that. That is a good video idea! Thank you for your input, I appreciate it!
+acservicetech Thanks
Are these Delta temperature measurements also useful or possible in an automotive air conditioning system?
In a car, the compressor will be ramping up and down with the engine but may be around twenty degree temp diff with the condensor fan is on at park. In a single speed compressor for a building the delta T is known. I don't work on cars that much, thanks!
i have a lennox R22 system in my house with TXV on the indoor unit. im getting 15.5° of subcooling with an outdoor temperature of 68°, High side was 149, low side was 44. Is this subcooling within range?
For the target subcooling, you usually can find it on the rating plate. If this is wore off then usually set it to 8-12 degrees of subcooling. I usually go for 11 degrees and then check for 18-21 degree temp decrease between the return and supply duct. Thanks
Great video, one of the best channels on YT for HVAC.
Is it normal to have a Single state condenser (carrier CA16NA30) with a subcooling name plate of 10, but with a builder installed Piston for higher reliability? My new home has a carrier condenser with an empty piston package taped to the bottom recessed area where the whip connects.
In this case, are the techs supposed to check charge by Superheat even though the nameplate says Subcooling 10 deg?
Yes, if you have a piston installed, the Total Superheat method would be used for checking the charge of a single speed split ac unit, thanks!
@@acservicetechchannel Would you do the same on an automobible AC system with a orifice tube, then, ie, use the Superheat method? Are these methods applicable, Superheat (capillary / orifice tube), or Supercool ( expansion valve), with automotive AC coolant charges? Thank you. Great video!
thanks for this ...
Thanks Again!
Ok I understand but how do you adjust on the gauges
Is it more accurate if the superheat is measured at evaporator exit point than at service valve? Since the line set run length, insulation, exposure to ambient temperature can vary from system to system. Let say evaporator coil of r22 are operating at 40f boiling point in the middle of evap coil, so the temp reading at the exit evaporator suction line should be around 45f to 50f to ensure there is minimum 5 degree superheat happening in evaporator, Then we can disregard the condition or the length of the lineset which can be affected and not giving the accurate reading at the service valve. I am talking about fixed orifice system here.
I am totally with you. Yes it is much more accurate to check at the exit of the evap but no manufacturers recommend adding a port there and we see no one doing this in the field. Here is the other side though. As important as the size of the saturated state and the superheat measurement afterward, the compressor's safety is very crucial as well. We would need to check the total superheat which is measured at the outdoor unit to make sure that there is no liquid getting back to the compressor if during the lineset run heat were rejected on the way back to the compressor. Also, back when pistons were mainly used, they were not really concerned as much with efficiency. We only recommend installing txv's for efficiency and compressor safety now, but hyes we need to keep the old ones running as efficient as possible, thanks
I am just a beginner, but think this is clear explanation of what superheat and subcooling means...and where to measure it while working with AC systems. If TXV installed - measure subcooling. If piston intalled - check superheat.
Thanks Roman!
Your videos helped me a big time while fixing my AC unit at home! Thank you and God bless! :)
Thanks Roman!
Hello, how you measure the super heat before the compressor when you have a liquid vessel just before the compressor. I suppose you measure it between the liquid vessel and the compressor? Or is it before the liquid vessel?
that is actually called an accumulator and you can measure right before the accumulator. Also check out the two articles that we have at www.acservicetech.com/articles and find the superheat method article and subcooling method article.
good job
Thanks Thermocom!
Nice
On your refrigeration system. Why is the service valve located on the liquid line? Does that make a difference if the service valve is located on the discharge side when calculating subcooling?
Yes it would. If the high side service valve is on the discharge before the condenser then you would not be calculating true subcooling since the pressure will be higher but manufacturers of package units sometimes do that and give you a charging chart on the inside of the shroud to follow, thanks!
You explained metering devices working very well. Now can you explain how the refrigerant it self reacts to the HP system workings. Some would use water as an example but that doesnt seem to work for me . The temp of the raw refrigerant at ambient may help. Why would a liquid boil at a lower temp ?
These may help. A liquid boils when it has room to expand - th-cam.com/video/yBqDkbuyuIo/w-d-xo.html&index=2 -- th-cam.com/video/Os2WMQxGSws/w-d-xo.html
G
So everyone using AC unit will need their superheat adjusted when the outdoor temperature changes? So every summer and winter heating cooling users are guaranteed a visit?
Superheat will change on it's own if there is a piston or capillary tube used as a metering device. The refrigerant charge should never have to be changed by a tech unless there is a leak, thanks!
So there's only one two times when there is saturation, being in the evaporator and condenser right?
While running yes, that is correct. The efficiency has to do with how large those saturated states are but they must phase change out of the sat state before leaving evaporator and the condensor, thanks
how is the superheating and subcooling done practically?
Hello :), I'd like to ask you for some advice. it is presently very hot here 35 and with humidity 45. I have several system that do not provide customers. I would like to know if it is normal that my suction is at ambient temperature knowing that it usually transpires. if I have a very high superheat, is it possible that the suction is not very cold? Thnx
Yes, that will happen especially if you have a piston for a metering device. A txv will allow a much better saturated state on the evap coil when it needs it the most, at high temp. A piston will work its least efficient when it is hottest out. You could have someone check the charge to verify, thanks GH!
AC Service Tech LLC cool :) thnx for your answer. Most system have à txv, i Will check the charge. This Is probably not enough gaz inside i supose. If not the système IT maybe undersize?
Very big thnx.. u help my life with ur tutorial and make me beter than Never :)
This exactly how I was taught over 30 yrs ago. My understanding is it's not taught like this anymore.
Nothing is taught anymore.