TXV vs fixed orfice

[The MG Pony]

Theoretical is not much good unless the person has practical too, some one who has both will be far ahead of one with out one or the other, remember, theoretical is just a model of the actual, yes those models are pretty dam excellent, but models non the less, there will all ways be a situation where only imperially acquired data will work! I've met people who can tell you every thing to know about a router, but when confronted with a real one didn't even know where to plug the cables in, yet he discribed it and its function perfectly, as in he learnt the paper side wonderously yet lacked practical. IMO One must have both, but I'd put more weight on the practical guy as he'll be better abble to figure a system out in the real dynamic world!!!

Thats what I am saying,

(What the hell is going on? Post a reply and it brought me to the welcome page! odd!)

[Sergei]

TXVs and fixed orifices are metering devices. Orifice is just wide open TXV. People have concerns about wide open TXV. Replace TXV with orifice. Did anybody see undercharged residential A/C(metering is orifice) with flooded compressor?

[paul_h]

Theoretical is not much good unless the person has practical too, some one who has both will be far ahead of one with out one or the other, remember, theoretical is just a model of the actual, yes those models are pretty dam excellent, but models non the less, there will all ways be a situation where only imperially acquired data will work! I've met people who can tell you every thing to know about a router, but when confronted with a real one didn't even know where to plug the cables in, yet he discribed it and its function perfectly, as in he learnt the paper side wonderously yet lacked practical. IMO One must have both, but I'd put more weight on the practical guy as he'll be better abble to figure a system out in the real dynamic world!!!

Thats what I am saying,

(What the hell is going on? Post a reply and it brought me to the welcome page! odd!)

No one here has just gone to uni and breezed through the course and then sat a MSCE or cisco exam. The refrigeration industry is nothing like comp sci or network admin. I even left the trade in 2001 to study comp sci, so I know the kinds of "know it alls" in those fields.
Most of us have studied theory as well gone on the tools so we know what's what.
You don't have to tell me about people specialising in theory, every PC forum I post in saying something about refrigeration always has some uni student trying to start a debate with me because they know better somehow.
But leave your type of attitude to those types of forums, please don't come here and say you have more knowledge than people who have been on the tools since before you had an interest in refrigeration.

Most of us have dealt with an ever changing industry, so we aren't stubborn and have had to constantly re-learn as we go. So we are not just stuck in a perfect theory world, we are continually getting feedback and learning, unlike those people you mentioned with easy one off certificates from the IT world.

edit: I'm guess what I'm trying to say is your prejudices are valid for people on an easy to get one off certificate that was 3+ years out of date when they studied it, uni curiculums being far behind as they are. But they don't apply to to refrigeration when most people learn on the tools before they even pick up a few books and study it in length in order to learn the theory to improve their knowledge.

[Sergei]

There is difference between TXV "hunting" and modulating.
TXV "hunting", usually, happens:
1. TXV superheat setting is too low.
2. Refrigeration load is significantly less than TXV capacity.
TVX will "hunt" from 0% capacity(closed) to 20-40% capacity and back to 0%. Some liquid can go into the suction line and into the compressor. Precondition for this "hunting" is enough liquid refrigerant to fill up liquid line, evaporator(100% full) and some liquid for suction line. We don't have this liquid in undercharged system.
TXV modulating is regular operation. TVX capacity will change from 70% to 100% and back to 70% in response to fluctuating head pressure, suction pressure and refrigeration load.

[The MG Pony]

No one here has just gone to uni and breezed through the course and then sat a MSCE or cisco exam. The refrigeration industry is nothing like comp sci or network admin. I even left the trade in 2001 to study comp sci, so I know the kinds of "know it alls" in those fields.
Most of us have studied theory as well gone on the tools so we know what's what.
You don't have to tell me about people specialising in theory, every PC forum I post in saying something about refrigeration always has some uni student trying to start a debate with me because they know better somehow.
But leave your type of attitude to those types of forums, please don't come here and say you have more knowledge than people who have been on the tools since before you had an interest in refrigeration.

Most of us have dealt with an ever changing industry, so we aren't stubborn and have had to constantly re-learn as we go. So we are not just stuck in a perfect theory world, we are continually getting feedback and learning, unlike those people you mentioned with easy one off certificates from the IT world.

edit: I'm guess what I'm trying to say is your prejudices are valid for people on an easy to get one off certificate that was 3+ years out of date when they studied it, uni curiculums being far behind as they are. But they don't apply to to refrigeration when most people learn on the tools before they even pick up a few books and study it in length in order to learn the theory to improve their knowledge.

Ok thats good to know, it just burns me when they pull the age card to trump a statment, shoot down a statment with technical data not 10 or 30 years of this or that I've learnt that time alone is not a qualifier, and learnt it well. I am sure you have had to have met the types I'm talking about!