Been doing this for a decade now. Im pretty sharp and can fix almost anything. But I’ve struggled to fully understand saturation and all of its aspects in a diagnosis. Thank you for your content and efforts. It helps us grow without having to sit in a classroom.
More heat energy is making the molecules vibrate and bounce faster this increases the pressure. If you take a refrigerant tank that's inside, and put it outside you will see the pressure rise for the same reason. If you take the tank and put it in the freezer, it will give up its heat energy and the molecules will bounce and vibrate slower and the pressure will decrease. The molecules will be vibrating and bouncing off one another at a slower rate and a lower pressure.
These videos are great. I am starting an apprenticeship soon and don't want to go in completely green, so thanks for bestowing your knowledge! Sorry if this is a dumb question, it has probably already been stated and I missed it or can't wrap my head around it, but do the condensor and evaporator always achieve saturation in the field? I.e. Could a compressor be putting out X amount of vapor superheat, and the condensor then rejects some of the sensible heat but not enough to begin turning it to a liquid (latent heat)? I would assume if this were the case, the liquid line filter dryer would deteriorate and clog the system? Alternatively, if the evaporator didn't achieve boiling/saturation the compressor would fill with liquid and break? Is it possible for this to occur, and if so, are there early symptoms you can observe before it happens, before something breaks?
Yes, it's possible to not have saturation. Not enough refrigerant is the answer. Not enough refrigerant would not build enough pressure to condense. Not enough liquid to have liquid in the clndensor. No liquid feeding the metering device would mean no liquid and no saturation in the evaporator. Great question and thought process, you will do well!
Hello again! I’ll be asking a lot of questions right now… How much can the saturated temperatur/pressure differ from a cold day and a hot day( both inside and outside). As I can understand, we dont really count the pressure change in a subcooled or a superheated state when we read the saturation on the manifold gaugeset. Which is about 10-15K. So how much do the inside/outside temperature really matter to the saturated temperature? (I hope I can make myself understood in English)
The saturated temperature is greatly affected by the air temperature and the airflow. Example 410A high efficient unit with proper charge, airflow ext. Outdoor temperature 70F saturated temperature 80F pressure of 235 psig Outdoor temperature rises to 110F saturated temperature rises to 125F pressure of 447F That's a big pressure difference! I door say the customer keeps at 68F , 50% RH the saturated temperature be 32F and 101PSI The customer keeps the infor temperature at 80F the saturated temperature is 50F and suction pressure is 142. Big differences in pressure with the system operating correctly. We cannot accurately charge a system with pressures alone.
Thank You TY. However, I want to Charge my Compressor with R404A gas and I want a Condensing Temperature of 120°F should I guage the discharge gas at the Compressor to be 418psig? also will pressure drop in Condenser not be an issue in my design?
There is no set condensing temperature. It will change with outdoor ambient. As the outdoor temperature drops your liquid saturated will drop with it. As the outdoor temperature rises your liquid saturated will rise with it.
I am confused that the temperature of the boiling water and alcohol were dropping with an increase of vacuum but there is supposedly no temperature change at saturation.
The water that is boiling, changing state is absorbing the heat away from the existing water, this lowering the temperature of the existing water. If I was able to have a large enough vacuum pump to instantly drop and maintain the vacuum level, approximately 25% of the water would have instantly flashed from a liquid to a vapor instantly dripping the remaining water to its saturation temperature. I do not have nearly that powerful of a vacuum pump or system.
What I thought was true is that at saturation, no matter how much heat we add, water will not get any hotter than 212. But now I see from you that is only true if pressure is held constant. I think I've got it. I've made it through lesson 26, so you must be doing something right! 😃
Been doing this for a decade now. Im pretty sharp and can fix almost anything. But I’ve struggled to fully understand saturation and all of its aspects in a diagnosis. Thank you for your content and efforts. It helps us grow without having to sit in a classroom.
I love your sites your videos
It helps me a lot
Most of the work i do im learning from you
Awesome! Thanks for the feedback, much appreciated.
Start the Learn HVAC playlist in sequential order here
ruclips.net/p/PLc7QlzR-srBgknwzlXjoESxNbzHQJ-TIq
Your a good teacher Ty. Thanks for everything.
Awesome vid thank you!
Thank you
this is called temperature difference and also refrigerant flow from pressure
Hi sir do you have a video showing how to wire and the use of oil safety pressure switch
Oil safety will be in my commercial section. I'm pretty far from that. Lots of work to do.
Hi and thank you Ty. I have always had the doubt. Why does the pressure on the high side increase when the ambient temperature increases?
More heat energy is making the molecules vibrate and bounce faster this increases the pressure.
If you take a refrigerant tank that's inside, and put it outside you will see the pressure rise for the same reason. If you take the tank and put it in the freezer, it will give up its heat energy and the molecules will bounce and vibrate slower and the pressure will decrease. The molecules will be vibrating and bouncing off one another at a slower rate and a lower pressure.
These videos are great. I am starting an apprenticeship soon and don't want to go in completely green, so thanks for bestowing your knowledge!
Sorry if this is a dumb question, it has probably already been stated and I missed it or can't wrap my head around it, but do the condensor and evaporator always achieve saturation in the field?
I.e. Could a compressor be putting out X amount of vapor superheat, and the condensor then rejects some of the sensible heat but not enough to begin turning it to a liquid (latent heat)?
I would assume if this were the case, the liquid line filter dryer would deteriorate and clog the system?
Alternatively, if the evaporator didn't achieve boiling/saturation the compressor would fill with liquid and break?
Is it possible for this to occur, and if so, are there early symptoms you can observe before it happens, before something breaks?
Yes, it's possible to not have saturation.
Not enough refrigerant is the answer.
Not enough refrigerant would not build enough pressure to condense. Not enough liquid to have liquid in the clndensor. No liquid feeding the metering device would mean no liquid and no saturation in the evaporator.
Great question and thought process, you will do well!
@@love2hvac Thanks!
Hello again! I’ll be asking a lot of questions right now…
How much can the saturated temperatur/pressure differ from a cold day and a hot day( both inside and outside).
As I can understand, we dont really count the pressure change in a subcooled or a superheated state when we read the saturation on the manifold gaugeset. Which is about 10-15K. So how much do the inside/outside temperature really matter to the saturated temperature? (I hope I can make myself understood in English)
The saturated temperature is greatly affected by the air temperature and the airflow.
Example 410A high efficient unit with proper charge, airflow ext.
Outdoor temperature 70F saturated temperature 80F pressure of 235 psig
Outdoor temperature rises to 110F saturated temperature rises to 125F pressure of 447F
That's a big pressure difference!
I door say the customer keeps at 68F , 50% RH the saturated temperature be 32F and 101PSI
The customer keeps the infor temperature at 80F the saturated temperature is 50F and suction pressure is 142.
Big differences in pressure with the system operating correctly.
We cannot accurately charge a system with pressures alone.
@@love2hvac Thank you once again!
Thank You TY.
However, I want to Charge my Compressor with R404A gas and I want a Condensing Temperature of 120°F should I guage the discharge gas at the Compressor to be 418psig? also will pressure drop in Condenser not be an issue in my design?
There is no set condensing temperature. It will change with outdoor ambient. As the outdoor temperature drops your liquid saturated will drop with it. As the outdoor temperature rises your liquid saturated will rise with it.
I am confused that the temperature of the boiling water and alcohol were dropping with an increase of vacuum but there is supposedly no temperature change at saturation.
The water that is boiling, changing state is absorbing the heat away from the existing water, this lowering the temperature of the existing water.
If I was able to have a large enough vacuum pump to instantly drop and maintain the vacuum level, approximately 25% of the water would have instantly flashed from a liquid to a vapor instantly dripping the remaining water to its saturation temperature.
I do not have nearly that powerful of a vacuum pump or system.
What I thought was true is that at saturation, no matter how much heat we add, water will not get any hotter than 212. But now I see from you that is only true if pressure is held constant. I think I've got it.
I've made it through lesson 26, so you must be doing something right! 😃
Hi sir, the sound is a bit low. But thanks though.
Thank you for letting me know. Sound is my biggest hurdle. This is feedback I nedd.