On Tue, 05 Oct 2004 20:52:58 -0400, Threeducks > wrote:

>~^Johnny^~ wrote:
>> On Sun, 26 Sep 2004 14:58:07 -0400, Threeducks > wrote:
>>
>>
>>>Nope. There is no heat loss when you pass a fluid through a throttling
>>>expansion, but there is a significant temperature drop. Now it's
>>>becoming clear that you don't really understand how a refrigeration
>>>cycle works.
>>
>>
>>
>> You mean expansion valves, orifices, tubes, and the like don't cause a
>> negligible friction loss? :-)
>>
>> Shame on you! :-)
>>
>>
>> All joking aside, throttling (metering) does indirectly cause a heat loss of
>> fluid to air, as it forces condensation of the working fluid (latent heat),
>> and there is resultant desuperheating and subcooling (sensible heat) involved
>> as well.
>>
>
>You seem to be confused. The system of interest is a working fluid
>passing from upstream of the orfice to downstream, not the rest of the
>cycle.

Uh, I was being facetious.
Believe me, I am NOT confused.

I led. I am confused about your post! :-)



>The change in enthalpy of a fluid as it passes through a valve
>is zero and you can look that up in any thermodynamics textbook.

Of course. Ignoring friction losses.
Of course, I was being a smartass.
I am having fun! Are you?


>The
>energy contained within the fluid does not change as it passes through
>the valve! Where would it go?

=Whooosh!= It sailed right over your head, my friend.
I was intentionally splitting hairs. You can't argue against friction loss!
When a fluid flows through a capillary tube, there is (almost) sunstantial
friction loss! And with a TXV or TEV, there is turbulence, possible
cavitation, etc.


>How do you explain your concept of
>"heat" in this context where we have a large temperature drop, but no
>change in the amount of energy contained by the fluid?
>
>The valve does not cause condensation, that is done in the condenser,
>which is before you get to the valve. When you drop pressure with a
>valve (or orfice), you vaporize part of the working fluid. How do you
>expect to condense a fluid by reducing its pressure?
>
>>
>> [Now I'm gonna sound ridiculous, to prove a point:]
>
>You've already sounded quite ridiculous. The only thing you've proven
>is you know nothing about refrigeration.


Bull****.

YHBT, YL
(You have been trolled, you lost).

I have designed and built numerous systems for a living.
What have YOU done? Flame me? **** you.

Go soak your head.








--
-john
wide-open at throttle dot info