Charging by weight question

[dpatty]

so what kind of operating range would you say cap tube systems have. I have seen txv's operate over a several ton range.

could you say, take the cap tubes from a 3 ton evap and use them on anything from say 2 ton to 4 ton just as an example. if not why, I would consider an oprating range the defining charictaristic of a modulating metering device. Prove that then you may have a chance of actually winning this.

[airmechanix]

...this, is what makes me love this forum...humorous yet informative

Keep up the good work!

[fat eddy]

I never made claim that it was a good metering device or very versatile just simply stated that it is a modulating metering device and I got nothing but greif for my sincere efforts.

The cap tubes claim to fame was that it was more economical than the other devices of its day and that it nearly by itself propelled the domestication of small refrigeration systems.

[rsmith46]

Fast Eddy, you really should think about teaching seminars to enlighten other tradesmen. Somebody sure has had fun teaching you.

[dpatty]

i agree with you except for the modulating part. it is a action reaction device with known outcomes under known conditions and they do not change. that is the nature of fixed metering devices. a modulating device can change those outcomes or maintain them under other conditions

[fat eddy]

I then will assume that a TXV's reaction to an action is unknown and therefore it must truly be an uncontrollable but none the less modulating metering device, but wait a minute wait a minute here I think I remember reading somewhere that it was very well known how it would react to temperature change at the bulb wow wow wow this is great we are truly getting somewhere now if we are not very very careful we might discover something new to the field here tonight, since the reaction to an action is predictable the TXV must certainly be a fixed metering device, Nah, I'm going to go with modulating.

Give it up yur outmanned and I got to get some sleep.

Oh yeah I read that in the instructions.I remember it now, the little blue and white piece of paper with the label "read this first" on it.

[dpatty]

Lets take a poll.

Has anyone even began to think that on any level that fat eddie know what he is talking about?

I think I know what he talking about but I don't think anyone would define it as modulation much less to say that the device used is modulating.

unfortunately eddie I have to go to bed 5am comes to early in the morning to stay up debating this. I can say it has been fun.

I'll be back tomarrow

[Wild Leg]

A modulating device with NO moving parts.

Can you name another?

[Carnak]

Originally posted by dpatty
Lets take a poll.

Has anyone even began to think that on any level that fat eddie know what he is talking about?

I think I know what he talking about but I don't think anyone would define it as modulation much less to say that the device used is modulating.

unfortunately eddie I have to go to bed 5am comes to early in the morning to stay up debating this. I can say it has been fun.

I'll be back tomarrow

No I gave up on him when he told a HO to use B-vent for oil. He saw the error of his way on that one eventually.

[svtti123]

Some interesting information on cap tubes and more.



http://www.climaticcontrol.com/info/...ec_8(rev1).htm Home Page[/url]


[Edited by svtti123 on 02-15-2005 at 02:03 AM]

[Carnak]

That is an interesting article svtti, it is the first thing in this thread that mentions subcooling which seems to be the key to it all.

The cap tube is still at the mercy of what leaves the condenser, a little more subcooling seems to compensate a bit for reduced head pressure.

More subcooling, less flash, more mass flow rate. I never thought of it as liquid having a higer velocity, I always thought of it as liquid having more mass.

[Carnak]

Same arguement would apply to distributer tubes after an orifice

[Wild Leg]

Quoting from http://www.climaticcontrol.com/info/...ec_8(rev1).htm
"...cap tube itself cannot change its flow rate..."

[fat eddy]

It modulates, according to the load however not efficeintly. I'm done with it, I almost got booted because of this thread so I'm going to become more agreeable.I apolegize to anyone I may have offended.

[fat eddy]

Thank You,

For posting that info it is pretty much what I was saying, although I think they will still argue their mute point.

[dpatty]

I was at no time offended, to the contrary I was amused and entertained. although one of my remarks may have been, my apologies

[mo-flo]

how did you guys know i was coming?you guys have been waiting on me,ain't ya??.....got a cap tube system today,and i'm learning......would this explain why when i pressured lines i had equal pressure on both sides????i pulled vacum it held and pressured it up and thought i had leak.....................

[fat eddy]

neither the orifice or a piston have a bubble point, correct me if I am wrong.