Refrigeration Basics with Elliot and Bert Part 2

In part 2 of a series on Refrigeration Basics, Elliot and Bert team up to teach a class about how HVAC and refrigeration systems work. In this part of the class, they discuss the functions of the main components in the refrigerant circuit, states of matter, and how to interpret your temperature measurements with that knowledge.
There are four main components in the typical refrigeration circuit: an evaporator, a compressor, a condenser, and a metering device. Each of these components manipulates the pressure or temperature of the refrigerant inside it. For example, the metering device drops the pressure of liquid refrigerant going into the evaporator; when this happens, a small temperature change occurs, and the pressure drop also causes some of the high-pressure liquid refrigerant to boil off. The components are connected by the suction, discharge, liquid, and sometimes expansion lines.
Matter comes in three phases: solid, liquid, and vapor. We should never see solid refrigerant in an HVAC system, but the refrigerant changes between the liquid and vapor states; evaporators transform liquid refrigerant to vapor, and condensers transform vapor refrigerant back to liquid.
These phase changes usually occur at specific temperatures, but we can manipulate the pressure to raise or lower the boiling point. That's why we can have cool vapor and warm liquid with roughly the same amount of energy despite the temperature differences. Saturation temperature is the temperature at which the refrigerant either boils or condenses, and it varies based on pressure.
The suction pressure is the pressure of the cool, low-pressure vapor refrigerant in the suction line. Its pressure should be the same from start to finish, and we can take the pressure reading at the suction service port. A common rule of thumb is that the suction saturation temperature should be about 35 degrees below the indoor ambient temperature, give or take about 5 degrees.
Part 1 - • Refrigeration Basics w...
Part 3 - • Refrigeration Basics w...
Part 4 - • Refrigeration Basics w...
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[@sajicherian539]

Excellent performance and great teaching

[@anothaparson]

That annoying crackling noise being picked up on the speakers is increasing my pressure and temperature. How do I expel this energy without getting heated?

[@antonioharris-g.a.-hvactec4997]

Both men are excellent teachers & instructors.#GreatJob! #UEI Colleges.

[@azetullahasadzada]

great job excellent teaching

[@greywolf6893]

Great information I appreciate you

[@robertwasswa1631]

Not even willing, this is more thumbs up.

[@frengkymelki2205]

Indonesia thanks you hvac tech

[@frengkymelki2205]

Please minisplit aircondisioner educasion

[@xaivergb]

great video

[@flickaclit6997]

I have no idea why I’m watching this but I do know one thing refrigerant was created by aliens

[@YouTubeCommunists]

I work on alien machines according to your logic.I love it!

[@a123clim]

😂😂😂

[@mikafoxx2717]

And they came from the planet Freon!

[@Goliad_Respector]

You should learn about all those ancestors we have that were amazing. Be better. Full stop. Read, or we will no longer have running water. You’re a minority in a country with ppl from countries that doesn’t value indoor plumbing… why would we still have it in 20 years?

[@SocratesDionisius]

Could refrigent gone if there’s no leak at all in the system?

[@identifiesas65.wheresmyche95]

Only if there wasnt any in it to begij with. Its a sealed system; if it was ever pressurized it retains pressure until the seal is broken by leak/someone letting it out etc.

[@mikafoxx2717]

​@@identifiesas65.wheresmyche95or you had an incompetent tech look at it and didn't figure out why it has high head pressure and just pulled refrigerant out

[@miguelsalguero1846]

How about is the temperate outside reaches 120 degrees I saw some ac units have a maximum outside temperature of 115 degrees
Could you comment on situation like this?
Thanks

[@shneekyshnake]

I would guess for a residential system 120+ will cause it to either not work at all or work very inefficiently. I think some large building systems use some kind of water system to get by on super hot days. I am no expert tho

[@mikafoxx2717]

Usually the TXV will make sure it gets hotter but head pressure will be off the charts and shorten that compressor's life if not trip something.

[@BRADASSOFFGRIDHOMESTEAD]

proper tea temp would be between 180 and 190. You are ruining your tea.