It's a Thermostatic eXpansion Valve.
This link should help you out http://www.google.com/search?hl=en&q=txv
I enjoy perusing these message boards - interesting and useful information, colorful characters and always something new. However, I have yet to deduce from context what a TXV is; I can't figure it out - so I'm asking. What is a TXV? Nothing I need to know, it would just help me better understand and enjoy some of the posts.
I trust you all will also supply some comical and border-line off-color alternatives.
thanks, gents.
It's a Thermostatic eXpansion Valve.
This link should help you out http://www.google.com/search?hl=en&q=txv
nope, I would have never guessed those answers. Either of them, actually.
This valve protects the compressor in the event that the high side pressure is greater than it should be? Or not. Whatever.
It certainly makes more clear some of the back-and-forth on the different compressor types and why some would need this valve.
I had figured the T was for trans and the V for vestite, but didn't want to pursue that any further.
What would the X stand for in your equation? LOL.
It controls the amount of refrigerant flow into the evaporator, by several factors. In particular, in controls the superheat, it makes sure there is not liquid flooding back to the compressor, which will slug it. It varies the flow by load in the unit.
Yep,
Keeps evap as full of liquid refrigerant as required, regardless of load temp.
I don’t always drink beer, but when I do I prefer Dos-Equis. I am the most interesting man in the world. Stay thirsty my friends.
Haha thats great lol
Also check out www.sporlan.com for lots more info.
This may be a silly question however, since I've seen so many folks chime in I have to ask?
- So how does this effect the efficiency of my AC?
- Will it give me a higher SEER rating?
- Do most new high SEER rated system already have one installed?
- If I don't have one on my current AC system should I get one?
Inquiring minds want to know ....
Thanks
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It assures the evaporator has the correct amount of metered refrigerant for a given heat load imposed onto the coil.
It helps the coil run at a consistent saturated temperature, meaning in humid climates it will dehumidify the air better than a coil with a fixed restrictor metering device.
It reduces the likelihood of liquid refrigerant reaching and damaging the compressor by closely controlling superheat. A fixed restrictor can't do that.
If your system does not already have one installed, you may see an uptick in SEER if you install one...closer to home you will see an improvement in performance, especially humidity removal.
Will it give me a higher SEER rating?
Many do, but not all. SEER is a numbers game. Tweak coil size, motor winding size...whatever it takes to make the numbers under the given test conditions. If the manufacturer can do it with a piston, he will. Otherwise, TXV.
- Do most new high SEER rated system already have one installed?
If you want one, get one. If you live in a hot, humid climate, definitely get one. If you live in Arizona or other arid region, you may do just fine with a piston, depending on how well the system is installed and charged.
- If I don't have one on my current AC system should I get one?
Actually the main reason for increase in efficiency comes in the off cycle. The non-bleed TEV keeps the liquid in the liquid line allowing the system to restart ready to go, rather than having to build the head and subcool and is quicker to feed a solid column of liquid to the TEV.
True, but it also improves the "B" test results (82°F ambient), providing better latent heat removal as shophound notes.
It would be more accurate to say "A hard shut-off TXV can and has been shown to improve dehumidification over a piston metering device in many cases".
"Improves the B test results" isn't exactly what shophound noted. I'm aware that you are a TXV (excuse me "TEV") expert, but "B test results" could stand to be elaborated on, I think. Do these test results find, for instance, that the TXV is always going to improve dehumidification over a piston in the same system under the same indoor and outdoor conditions, regardless of other system features or settings, as implied by shophound?
Last edited by hvacrmedic; 03-21-2008 at 03:57 AM.
The fact that a non-bleed type TEV can hold a pressure differential during off-cycle has little to do with it providing improved dehumidification. The fact the TEV can control superheat despite varying head pressures allows for greater evaporator performance and improved dehumidification under these conditions.
No, he stated you can get improved dehumidification with a TEV.
Perhaps. But I've discussed this subject several times in the past. For those who are interested in reading the standard, it can be downloaded from here: http://www.ari.org/ARI/Content/Finda...Listing_PK=160
Now you're putting words in his mouth.