Refrigeration in The Real World

Join CaptiveAire for a professional development hour (PDH) about the basics of the refrigeration cycle, including discussions on the properties of refrigerants and varying P-H charts, defining subcool and superheat using the P-H chart, and the energy implications of modulating equipment and how to define the energy efficiency ratio (EER) and the coefficient of performance (COP). This video is helpful for anyone in the HVAC industry, especially HVAC engineers and consultants, or anyone who wants to learn more about the inner workings of HVAC units. Learn more about CaptiveAire at captiveaire.com.
To receive PDH certification for this video, please visit CaptiveAire.com/library and click Request Access under the Professional Development section. Fill out the form on the pop up that appears and click Send. CaptiveAire will then add you to a professional development portal where you can access a certificate to confirm your training.
0:00 Introduction
1:52 Part 1 - The Process
2:53 Constant phase heat exchange
7:20 Variable phase heat exchange
10:32 Part 2 - Refrigerants
11:35 The Pressure-Enthalpy (PH) chart
12:44 Pressure and temperature relationships
15:06 Part 3 - The Refrigerant Journey
15:11 Compression
17:26 Condensation
18:40 Subcool
21:09 Expansion
25:18 Types of expansion devices
23:26 Evaporation
24:26 Superheat
27:30 Part 4 - Efficiency
27:40 The PH chart and efficiency
29:48 Calculating Coefficient of Performance (COP)
34:06 Energy Efficiency Ratio (EER)
32:13 Thought experiment, the open refrigerator
34:54 Efficiency hurdles
36:15 Scroll compressors
37:06 Inverters and variable frequency
37:56 Part 5 - Modulation
38:00 System balance in constant speed systems
39:30 System balance in modulating systems
41:11 Software and Controls
42:56 Conclusion - The Future of Refrigeration

[@johnkurtz9304]

This is the best video to watch to learn about refrigeration!

[@sparc5]

agreed. I'm gonna watch twice with a notebook to write down formulas.

[@narasimhamurthy7180]

One of the best videos out there, explaining refrigeration in the simplest way possible while covering all aspects. This video should be at the top of the list. Thank you @CaptiveAire for making such a beautiful video.

[@kekdu]

Excellent is not enough to describe so much perfection, thank you very much!

[@luisalves9738]

I don't comment much on youtube but I gotta make an exception this time. your videos are top grade! Thank you for the amount of effort you put into every detail.

[@shyamkumarful]

One of the finest videos on refrigeration cycle. This channel deserves more attention and reach than it has at the moment.

[@CAPTIVEAIRE]

Spread the word! Thanks for the feedback.

[@jameo1690]

If they continue making content like this they'll gain traction. They just have to grind it out and put their time in. They definitely have what it takes to be successful 100%

[@jameo1690]

Absolutely the best explanation on KZbin!!! Please continue to make content of this caliber .... Good job 👍

[@Studentofhvac]

These videos are incredible. Both entertaining and informative which is hard to pull off.

[@sagarprajapati9357]

Remarkable explanation with flawless visuals. I applaud your efforts to make this gem!!

[@CAPTIVEAIRE]

Thanks for commenting, we appreciate your feedback!

[@footballfanatics49]

This video should be taught in hvac classes. This is too good. Only if i had access to these during my uni times

[@ineedstuff8286]

can you help me i am confused… if you dont want to read i get it 😂 i am totally confused. Everywhere else, I see examples of how “cooler gas” of lower pressure enter comp. It leaves comp higher pressure and warmer. It hits condenser and gets cooled. Low temp, high pressure gas. It then goes through a valve, introducing low pressure. It thus cools enough… to become liquid tho, then travels through evaporator picking up heat… enough to cycle back to the start… a gas thats lower pressure and temp. At 8:56, he’s sayin that a liquid is cooled into a gas?.. is this just a simple mistake of two terms being swapped accidentally in diagram? gas w/ liquid? Unless specially made refrigerants can be a liquid, and cooled into gas. Isnt that opposite of all substances on earth.

[@CAPTIVEAIRE]

​@@ineedstuff8286 You're correct that the terminology could be more clear. I suggest looking at the "expansion" section starting at 21:10. The refrigerant expands and the pressure drops entering the evaporator. Within the 2-phase region, lower pressure means lower temperature, and since we entered the 2-phase region, a small part of the refrigerant at this point has turned into a gas . As the refrigerant travels through the evaporator, it will pick up heat from the airstream, and this heat turns the rest of the refrigerant fully into gas (and a little bit warmer even = superheat). However, relative to the exit of the compressor, this gas refrigerant leaving the evaporator is still cool in comparison, and of course at a much lower pressure.

[@ineedstuff8286]

@@CAPTIVEAIRE dude thanks sooo much for explaining all of that🙏🏻😅Ive managed to learn somebasic electronics recently. After having a mechanical ability, yet little experience, after all these years (45), lately alot of mechanical AND electrical concepts have all “clicked”… like, to where you see the bigger, more mature picture. Youve been integral part🙏🏻 Cheers

[@abdulajees7653]

actually we need say thank you for making this and other video at end everything is awsome masha allah

[@Theexplorer744]

Best video presentation ever. I think this will help me get my presentation together.

[@WswRefrigeration]

Another great video

[@Rgdengineers]

Outstanding! 👏👏👏

[@liftingfishingandlife4481]

Great video.

[@carlosalexandrereis3110]

Really well done, it´s like i knew the inputs vs outputs, but 0% about how and what was inbetween or the process.... thanks for ur work and for sharying

[@brlinrainf]

45 minutes. nice explenation

[@paulenzang]

Very good information. Can we get the powerpoint presentation, please?

[@CAPTIVEAIRE]

Thank you. This content was designed to be delivered as a video, so there is no such powerpoint presentation. Feel free to use the video as needed.

[@garypoplin4599]

20:31 Fellow Colonels: Military personnel of the same rank.

[@carlosalexandrereis3110]

time: 5:21

[@JohnnyJr396]

Thank you. On the condenser side, how do you know what pressure you’re trying to achieve? I get you want the saturation temp higher than the ambient air , just curious if there is a target. Usually we see about 30 degrees

[@CAPTIVEAIRE]

You are correct, we generally target a specific temperature delta and modulate the condensing fans to achieve this.

[@JohnnyJr396]

@@CAPTIVEAIRE thank you

[@angelamarodelgado7016]

👏👍👍