Compression Ratio
ฝัง
- เผยแพร่เมื่อ 4 ธ.ค. 2023
- Instructor Bryan Orr dives deep into the nitty gritty details of compression ratio in HVAC systems in this HVAC School video. He touches on the answers to the following questions: What exactly is the compression ratio? Why does it matter? How is it calculated, and what impacts it?
Bryan covers all of this and more using real-world troubleshooting stories and examples to reinforce key concepts. He examines compression ratio in different system types, from air conditioners to heat pumps to refrigeration. The class learns how condenser coil size, evaporator temperature, multi-staging, and even airflow affect ratio.
Most importantly, Bryan shares tips for properly diagnosing and troubleshooting compression ratio problems in the field. What causes a low compression ratio? What are the consequences? How do you identify issues with the compressor, reversing valve, or metering device? The Kalos team gets crucial knowledge they can apply to every job.
HVAC professionals at any experience level will benefit from the information in this video. Join the class and take your understanding of compression ratio to the next level!
Preparing for Heating Season playlist:
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Read all the tech tips, take the quizzes, and find our handy calculators at www.hvacrschool.com/ or the HVAC School Mobile App on the Google Play Store (hvacrschool.com/play-store) or App Store (hvacrschool.com/app-store).
We can’t thank you enough for your videos
it's nice to hear someone who actually enjoys teaching, speak. my "trade school" doesn't have one instructor that cares....
I've learned years worth of knowledge in a very short time with these videos. You sir are a saint.
YOU GUYS ARE AWESOME FOR UPLOADING THESE LECTURES
Lots of info for someone just getting started
Amazing! Always making me a better tech even after a decade
Wow the guys and gals at this company are so lucky. My career started with no training and I had to search out the knowledge myself and these guys train in house! Wow! Setting an example for others to follow thank you
Your bleeped out part is alliance compressors in trane equipment.
Figure other people may wanna know 😆😆😅👍
Is that when it sounds like someone dropped a bucket of rocks into the compressor? I had it happen on an American Standard
Thanks very much Bryan. It’s great to be part of such a good thing. I’ll be taking my contractors License test next week and you sir are big part of my learning. Not to mention I am 3rd generation so I grew up in it.
Very nice to improve the HVAC technical knowledge
Great class. Great dissustion. Great info. Thank you Bryan.
Very good information, love the subject
Another great class
Thank you for sharing ❤
Good Information. you should go over outdoor temperature and indoor temperature relationship to compressor ratio.
Wonderful lessons. I liked the "I'm kidding" part
Very cool!!
Always Excellent. Thank you. raphael nyc
Sweet pump
I've been in commercial refrigeration and hvac for over a decade now and as much as I love the physics and theory behind refrigeration I've learned to throw most of it out the window because its all based on new equipment and optimal conditions. Its a guide but a lot of times can get you into trouble when it comes to diagnosis. At the end of the day there's no replacement for experience and a good friend or co-worker to call when a system is kicking your ass.
You could be that guy that people call when they are stuck!
Before you do your troubleshooting you need to understand what you do, learning adds value to experience
@Anzarvitalbio I could publish a book long response but I'll save you the suspense. Most women take anesthesia during child birth because the pain isnt worth learning about. If you wanna go down rabbit holes have fun with general relativity, if you wanna make money I suggest you listen to your elders and fake it till you make it. Or go be an engineer and make 1/4 what a good tech does. Do whatever suits your cooch lil buddy. Refrigeration and hvac isn't for everyone and if you're not mechanically inclined go "my pleasure" youre way to the top of the chic-fil-a fast food ladder because moving heat around clearly aint for you. The fact that you're even sitting in a classroom having to have your hand held should bring reconsideration to your choice of career. In any event, best of luck. 🤙🏿
@@popo_53Then why are you watching these videos?
@@horrorhotel1999 entertainment. Ya dft cnt.
IF i changed the blower speed should my static pressure still be within .5 inwc?
Copland does it . I have experienced it a few times
What about compression ratios in mini split because as it gets close to set point it almost equals or close to zero delta
Your thoughts?
so thats probably what if been seeing out there in the field.
I noticed today my pressues were 144/266psig, subcool 2.4, superheat 0.7 , ambient temperature 89 F, delta t 13 degrees, and a bad capacitor rated 45mfd and cap was reading 10mfd.
I do understand the difference of a low charge, low air flow , liquid restriction but what was throwing me off was when i would get 1 degree superheat and 2 degree subcool on split systems like reheem or lennox when pt chart was asking 7 or 9 subcool
I had a similar issue not too long ago. Turned out to be low charge AND plugged TXV.
@@victork3397 thanks!
I understand you guys have electric aux heat for your location but I d love to see a continuation on heat pumps with a dual fuel. It’s becoming more popular in colder climates where electric heat backup is not realistic
May ask A aquation is it compression ratio or pressure ratio because I think compression ratio is the ratio between the volume trapped at suction point to the volume trapped at compression point Vsuc. : Vcomp. i.e trapped volume when the compressor at suction phase to the trapped volume when the compressor at compression phase
Hey Bryan....At 15min 30sec talk about mold issues from increased airflow ??? Seems backward, Got a video on that ??
Thanks. Tom
When you increase blower speed your reducing your ability to dehumidify. The air has less time touching the evaporator and in turn less change in temperature is taking place. Hope this helps.
Got it. Thanks. Tom.
Bert’s got it
I've been in the trade a very long time. I have looked at compression ratio as a help troubleshooting that I just do it immediately in my head without really thinking about it. ( very simple math usually )
I'm having a hard time with "add atmospheric pressure before calculating".
That makes no sense. It is a closed system. The amperage, or work done doesn't change because of the pressure outside the pipes. The equipment doesn't run different, or use more or less efficient depending on pressures outside the pipes.
Put the system in a closed room and pressurize the room to 100 psia, the refrigerant inside the pipes doesn't know or care, nothing changes, including the compression ratio.
The compression ratio (the way I use it everyday) is a quick indicator of how hard the compressor is working.
If I see anything more than 3:1 on a 410a system I know to look for an issue, below that (to a point) it's running efficient (not having to use a lot of energy), and if it's too low maybe the compressor isn't pumping at capacity or metering device stuck open. Then I turn to superheat and subcooling of coarse, because compression ratio, as I said, is just a quick indicator that lets me know if the compressor is having to work harder to overcome some other issue.
I know this is all very broad and vague, but as I said, within 10 seconds of hooking up gauges I've looked at the ratio and It's just an indicator. I'm not trying to pin it down to an exact number. As others have said in the comments, there are too many outside variables in conditions in the real world to worry about details that small.
i want to get into hvac but i have no experience at all
Everyone misses r22 systems with a piston metering device and a PSC blower motor.
i think brain sir getting weighted gain
Bosch
Really needs some color grade.
I can never get over how Americans don’t just use metric.. 14. Pressure?? No dude it’s 1…. 😅
340psi in the summer on 410?!?! What!!! That's like a 72° day...not Arizona or vegas....ypir more like 580psi/135psi.....
Adding 14.7 and dividing...wow the trade has gotten lazy af....need my app..need my app....need my phone...need my probes....wow...I get 10x more done with analog gauges and 2 hands and some ears...
A angle grinder and 2 minutes works good too😂
Reversing Valve : since we have little field experience here....let me make this one easy too.
TAKE YOUR SAWZALL AND CUT IT.....THEN CLEAN OUT SHAVINGS, AND PUT RIGHT BACK IN....TADAH.....IM HERE FOR YOU
Why would you have superheat if your not running? Oh boy.....😅😅😅😅😅😅😮😮😮😮
No heat being absorbed...so..ugh...yeah...I bet blower amps go UP with a dirty filter too😅
Ill stick where the real money is...COMMERCIAL/INDUSTRIAL REFRIGERATION.