I also appreciate your thoroughness. Thank you for sharing your knowledge. I've watched hours of your classroom teaching. So good. The Lord bless you, sir.
Great stuff. latent heat temp vs. condensing temp. Lol This video really is great at clarifying the temperature to pressure relationship. Today this video really made it stick into memory
I will eventually get to them. My friend Craig has some out right now ua-cam.com/video/JQkth-AM5CE/v-deo.html ua-cam.com/video/ebDB8EE9TUY/v-deo.html
3 роки тому+1
Just a taught! Subcooling should be adjusted at design conditions of condenser! That mean you have to ensure that condensing saturation temperature is maintained at design condition (usually at 40°C or 104°F) while adjusting sub-cooling by charge! I usually partially cover condenser to get to that temperature in winter time, if system does not have fan speed regulation or have pressure fan cycling, to stop cycling during charge adjustment.
Thanks, really good explanation, please kindly advise what the best sub cooling value is for a chiller cold room and a freezer cold room using a Tev in Celsius. The manufacturers in UK don't really print this on the evaporators or condensing units. The sight glass is a good sign of how much liquid is flowing in the system. Thank you
With commercial (recevers) there will be no subcooling, this the importance of a sight glass. Superheat is not set by the manufacture, it's usually feild adjustable. The walk in cooler yesterday I set at 10f superheat. (5.5 C) Chiller will depend on metering device DX direct expansion with txv will still use superheat. Flooded will use a float valve and not use superheat
Many still come with a fixed orifice. They all have kits to replace the fixed orifice with TXVs. Due to improper installation practices such as not flowing nitrogen while brazing, debris in lines, overheating during brazing causes them to get stuck. Techs see the TXV bad but not what causes it so in their mind they go bad. Also improper airflow across the evaporator coil and improper charge cause them to get misdiagnosed often. This unfortunately leads to many techs preferring the fixed orifice even though it clearly does not work as well. So they request a fixed orifice. Now some units are coming with electronic expansion valves.
Both superheat and subcooling. Exceptions nothing this order 1 critically charged systems such as ice machines, refrigerators. 2 Automatic expansion valves 3 float valves such as flooded evap chillers 4 systems with EPR, CCRP. 5 systems with a liquid receiver without a sub cooler circuit after it. 6 ductless / mini split units.
🤣 The txv is the gate that protects the compressor. But in the field the +or- takes the absolute finite degree or temperature out of the equation. On a gas and go 10° will work.🤔 It's like stoichiometric burn. You'll be stuck ,KISS ! 👍😎 🥃🥃🍺🍺🍺🍇🏌(👍) Stay safe. Retired(werk'n) keyboard super tech. Wear your safety glasses.
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I also appreciate your thoroughness.
Thank you for sharing your knowledge.
I've watched hours of your classroom teaching. So good.
The Lord bless you, sir.
I passed my first test thanks too your videos thanks for giving us this very experience knowledge
Another awesome lesson Ty.! I really feel comfortable knowing what’s going on during the cycle. Better than I ever did before.
I'm glad to hear that Sam!
Well done - as always.
This is a tricky subject.
Thanks!
Great stuff. latent heat temp vs. condensing temp. Lol This video really is great at clarifying the temperature to pressure relationship. Today this video really made it stick into memory
YOU ARE A BLESSING TO THE WORLD
Your teaching is so understandable I love the way you teach? Can u teach about mini split unit also
I will eventually get to them. My friend Craig has some out right now
ua-cam.com/video/JQkth-AM5CE/v-deo.html
ua-cam.com/video/ebDB8EE9TUY/v-deo.html
Just a taught! Subcooling should be adjusted at design conditions of condenser! That mean you have to ensure that condensing saturation temperature is maintained at design condition (usually at 40°C or 104°F) while adjusting sub-cooling by charge! I usually partially cover condenser to get to that temperature in winter time, if system does not have fan speed regulation or have pressure fan cycling, to stop cycling during charge adjustment.
That is correct!
Thanks, really good explanation, please kindly advise what the best sub cooling value is for a chiller cold room and a freezer cold room using a Tev in Celsius. The manufacturers in UK don't really print this on the evaporators or condensing units. The sight glass is a good sign of how much liquid is flowing in the system. Thank you
With commercial (recevers) there will be no subcooling, this the importance of a sight glass.
Superheat is not set by the manufacture, it's usually feild adjustable.
The walk in cooler yesterday I set at 10f superheat. (5.5 C)
Chiller will depend on metering device
DX direct expansion with txv will still use superheat.
Flooded will use a float valve and not use superheat
It seems like the TXV valve is the way to go. Do manufactures of evap coils still use fixed orifices or do they all come with TXV valves now?
Many still come with a fixed orifice. They all have kits to replace the fixed orifice with TXVs.
Due to improper installation practices such as not flowing nitrogen while brazing, debris in lines, overheating during brazing causes them to get stuck. Techs see the TXV bad but not what causes it so in their mind they go bad.
Also improper airflow across the evaporator coil and improper charge cause them to get misdiagnosed often.
This unfortunately leads to many techs preferring the fixed orifice even though it clearly does not work as well. So they request a fixed orifice.
Now some units are coming with electronic expansion valves.
Hello Branaman in every system should go with superheat or subcooling depend on what kind of device the system is utilized or with weight? Thanks.
Both superheat and subcooling.
Exceptions nothing this order
1 critically charged systems such as ice machines, refrigerators.
2 Automatic expansion valves
3 float valves such as flooded evap chillers
4 systems with EPR, CCRP.
5 systems with a liquid receiver without a sub cooler circuit after it.
6 ductless / mini split units.
Ty #7 VRF systems
superheat subcooling is the all meaning of refrigiration!!!
🤣
The txv is the gate that protects the compressor.
But in the field the +or- takes the absolute finite degree or temperature out of the equation.
On a gas and go 10° will work.🤔
It's like stoichiometric burn.
You'll be stuck ,KISS !
👍😎
🥃🥃🍺🍺🍺🍇🏌(👍)
Stay safe.
Retired(werk'n) keyboard super tech.
Wear your safety glasses.