How TXV works - Thermostatic expansion valve working principle, HVAC Basics vrv heat pump
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Date: 2023-11-17
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Comments and reviews: 29
al
I have a question. Is TXV only changing the liquid mass flowrate of the refrigerant through the TXV since the outlet is a mixture of liquid and vapor, or the total mass flowrate of the refrigerant? The reason that I am asking is that the total mass flowrate of the system should be constant. So the mass flowrate of the refrigerant entering and leaving the TXV should be the same in a closed system. If the TXV is changing the total mass flowrate, then where is all that refrigerant going coming out of the compressor (single speed compressor?
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I have a question. Is TXV only changing the liquid mass flowrate of the refrigerant through the TXV since the outlet is a mixture of liquid and vapor, or the total mass flowrate of the refrigerant? The reason that I am asking is that the total mass flowrate of the system should be constant. So the mass flowrate of the refrigerant entering and leaving the TXV should be the same in a closed system. If the TXV is changing the total mass flowrate, then where is all that refrigerant going coming out of the compressor (single speed compressor?
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Alysson
Good day i just want to clarify something. If the expansion valve did not sense the superheated refrigerant properly, wouldn't it be that the superheated fluid will remain superheated and when the compressor does work to it, it will further increase the temperature and pressure even more. Hence, it causes the compressor to be damage due to extreme pressure and temperature. Kindly correct me if I am wrong, I am really confuse. Thank you.
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Good day i just want to clarify something. If the expansion valve did not sense the superheated refrigerant properly, wouldn't it be that the superheated fluid will remain superheated and when the compressor does work to it, it will further increase the temperature and pressure even more. Hence, it causes the compressor to be damage due to extreme pressure and temperature. Kindly correct me if I am wrong, I am really confuse. Thank you.
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4x4Scout
Ok, correct me if I'm wrong but in order to get a liquid to the compressor you would have to overfill the system to begin with. A system with the proper amount of refrigerant has to compress it to get it into liquid form to begin with. Once you let the pressure of from say the TXV being wide open, the liquid would simply turn back into a gas and because of no pressure it would just stay in a gas form.
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Ok, correct me if I'm wrong but in order to get a liquid to the compressor you would have to overfill the system to begin with. A system with the proper amount of refrigerant has to compress it to get it into liquid form to begin with. Once you let the pressure of from say the TXV being wide open, the liquid would simply turn back into a gas and because of no pressure it would just stay in a gas form.
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Viktor
Hi,
Can you tell me what's wrong with my car ac please? It only gets cold after 10 minutes drive. After 10 minutes it works perfectly. Before the 10 minutes drive no cooling at all. It's been doing it like that years. Can the expansion valve cause issues like this? The compressor is running from the beginning of the drive.
Cheers.
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Hi,
Can you tell me what's wrong with my car ac please? It only gets cold after 10 minutes drive. After 10 minutes it works perfectly. Before the 10 minutes drive no cooling at all. It's been doing it like that years. Can the expansion valve cause issues like this? The compressor is running from the beginning of the drive.
Cheers.
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Connor
Had a crummy professor for Thermodynamics. They didnt think it was important to explain how a TXV valve works. After watching this, I have no idea how they could be so obtuse. Understanding how this valve operates is absolutely critical to be able to think about whats happening with these systems. Screw you professor Patel.
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Had a crummy professor for Thermodynamics. They didnt think it was important to explain how a TXV valve works. After watching this, I have no idea how they could be so obtuse. Understanding how this valve operates is absolutely critical to be able to think about whats happening with these systems. Screw you professor Patel.
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Leila
may i ask if there is any relief valve to absorv excess liquid in case txv failed? this way we can reduce or protect the compressor to be damaged as you said because of gas failed to change phase to vapor? since liquid is incompressible and will stall the pump and eventually damage associated parts.
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may i ask if there is any relief valve to absorv excess liquid in case txv failed? this way we can reduce or protect the compressor to be damaged as you said because of gas failed to change phase to vapor? since liquid is incompressible and will stall the pump and eventually damage associated parts.
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R.
Just curious. On a residential heat pump, 3. 5T, does the valve also control the ability of the unit to properly heat? When the valve begins to fail, as I think ours has (using the valve oil did not work, does it, in essence, use more electricity because it is trying to cool? Thank you!
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Just curious. On a residential heat pump, 3. 5T, does the valve also control the ability of the unit to properly heat? When the valve begins to fail, as I think ours has (using the valve oil did not work, does it, in essence, use more electricity because it is trying to cool? Thank you!
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Gurpreet
I am struggling to understand how does spraying fluid can reduce the pressure, because when we need to spray, then we need less area on the output, but from the pressure law we have P = F/A, so if the area is less the pressure should be high. Please can You explain me this?
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I am struggling to understand how does spraying fluid can reduce the pressure, because when we need to spray, then we need less area on the output, but from the pressure law we have P = F/A, so if the area is less the pressure should be high. Please can You explain me this?
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Len
The last ac tech that came to my house a few weeks ago moved the sensing bulb away from the pipe that it was attached to is this ok or is it harmful to the whole unit? You have any idea why he would do this? Should I put it back where it was? Thank you. Have a good day!
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The last ac tech that came to my house a few weeks ago moved the sensing bulb away from the pipe that it was attached to is this ok or is it harmful to the whole unit? You have any idea why he would do this? Should I put it back where it was? Thank you. Have a good day!
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anthony
Great discussion on the function of the bulb. its pretty clear that if the valve gets stuck in the closed position, there will be no cooling even though the refrigerant in the bulb is expanding against the diaphragm (trying to open the valve.
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Great discussion on the function of the bulb. its pretty clear that if the valve gets stuck in the closed position, there will be no cooling even though the refrigerant in the bulb is expanding against the diaphragm (trying to open the valve.
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Abdel
but the mass flow rate of refrigerant is constant and can only be controlled by the compressor speed, how for fixed compressor speed the TXV can control the mass flow rate? I think the system should include also a liquid line accumulator
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but the mass flow rate of refrigerant is constant and can only be controlled by the compressor speed, how for fixed compressor speed the TXV can control the mass flow rate? I think the system should include also a liquid line accumulator
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vikas
Can you please explain in temperature vs entropy diagram that how there is no entropy change in process 1-2 even when compressor compresses refrigerant? I believe that entropy should increase if any gas is compressed.
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Can you please explain in temperature vs entropy diagram that how there is no entropy change in process 1-2 even when compressor compresses refrigerant? I believe that entropy should increase if any gas is compressed.
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Cyrus
Good day Sir. I just want to ask something. I have an upright freezer that I wanted to make the freezing faster. Can I use the TXV, to modify the speed of running refregerant. Thanks in advance for any info.
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Good day Sir. I just want to ask something. I have an upright freezer that I wanted to make the freezing faster. Can I use the TXV, to modify the speed of running refregerant. Thanks in advance for any info.
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ssadda
Hi. I have a question and hope I can get an anser. I have a split system from Fuji with model ROA18RATH with afew problems. Does it use TXV and if so, where can I find it? Thanks
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Hi. I have a question and hope I can get an anser. I have a split system from Fuji with model ROA18RATH with afew problems. Does it use TXV and if so, where can I find it? Thanks
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Garth
Interesting. Sounds like if a compressor went bad it might be recommended to replace the TXV at the same time to be sure it was not the TXV that caused the compressor to fail.
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Interesting. Sounds like if a compressor went bad it might be recommended to replace the TXV at the same time to be sure it was not the TXV that caused the compressor to fail.
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Larry
Great explanation of THX with excellent illustrations. But please make the music lower then the narration so that the backround does not dominate speaking.
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Great explanation of THX with excellent illustrations. But please make the music lower then the narration so that the backround does not dominate speaking.
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Anthony
Does the TXV have to be installed close to the evaporator inside the cool room or can it be installed on the outside of the cool room? Does it matter?
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Does the TXV have to be installed close to the evaporator inside the cool room or can it be installed on the outside of the cool room? Does it matter?
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Jose
Recently got into the commercial refrigeration trade. Been watching your videos since I started. I appreciate all the info really helpful
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Recently got into the commercial refrigeration trade. Been watching your videos since I started. I appreciate all the info really helpful
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Mihlar
I like very very much of made of machinery for human less than REST RELIEF RELAX manage time to manner but I dnt want be carrier
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I like very very much of made of machinery for human less than REST RELIEF RELAX manage time to manner but I dnt want be carrier
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Salome
How is indoor TXV bypassed in heat mode? does bulb simply open it all the way and size of the line matches size of TXV opening?
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How is indoor TXV bypassed in heat mode? does bulb simply open it all the way and size of the line matches size of TXV opening?
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eaf
Wow, absolutely high quality stuff. The level of details, clear narrative and even background music. Good job and tons of thanks!
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Wow, absolutely high quality stuff. The level of details, clear narrative and even background music. Good job and tons of thanks!
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Rodel
This tutorial was different the refrigirant should come from evaporator before the compressor not compressor to evaporator.
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This tutorial was different the refrigirant should come from evaporator before the compressor not compressor to evaporator.
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mine
I was waiting for you to tell us how to know if the super heat setting is right or wrong and why and what to do about it.
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I was waiting for you to tell us how to know if the super heat setting is right or wrong and why and what to do about it.
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EVO
What happens if the capillary tube breaks off the txv? Does that make the clutch on the compressor kick on or off?
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What happens if the capillary tube breaks off the txv? Does that make the clutch on the compressor kick on or off?
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Artnel
I have watched videos from dedicated hvac techs and I was still confused. You explained it perfectly. Thank you
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I have watched videos from dedicated hvac techs and I was still confused. You explained it perfectly. Thank you
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RROrias
What part in the refrigeration system that is directly responsible in regulating evaporator temperature?
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What part in the refrigeration system that is directly responsible in regulating evaporator temperature?
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F165
The freon doesnt carry heat to the compressor. The compressor compresses freon which cause it to get hot.
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The freon doesnt carry heat to the compressor. The compressor compresses freon which cause it to get hot.
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AHmed
What if the cooling load is low and the superheat is low
But the the sensing bulb doesn't sense that
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What if the cooling load is low and the superheat is low
But the the sensing bulb doesn't sense that
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Rajat
In some designs we have a feedback acting from downwards! Please include the explanation for the same
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In some designs we have a feedback acting from downwards! Please include the explanation for the same
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