TXV is mechanically controlled. I want to be able digitally control
If the device doesn't exists, one way of implementing it would be
having multiple parallel capillary tube circuits with each circuit
controlled via a solenoid.
Yes there are, they are generally referred to as Electroninc Expansion
Valves, EXV's and they are standard application in many commercial
refrigeration units and systems..They can also be bought off the shelf
to match most any application.
Hope this helps,
My Dear Fat Eddy
Electrical Expanssion Valve control by? "microprocessor control"
or is it controlled by 24 volt and it could be used by any room temp.
condesable refrigerant it does not have to be R22. At first there were
manufacture by Singer corp. since then Alco and Sporlan came out
with thier versions and some type of electronic board that "perhaps"
could be called microprocessor controller ?! ?! either way, are not to
popular in industies, even so there are applications that could be useful
one valve could serve two purposes as a Solenoid and Expansion Valve.
The problem is with OEM's they seem to make somethings that is
useable for only one purpose and not gave user versatility or capability
for more then one applications, and in some cases lacking on
very inportant information like what happens to valve in case of
power faileur does valve position self to fully closed postion
or does it stay open, if valve remain open in my opinion it is worthless.
but then agian that is my opinion. I used EXV's in early 70's
Good luck from Dido
I don't understand what you are talking about, they are very popular,
maybe not tin residential units, but they are in commercial. The guy
asked about a EXV controlled by a microprocessor, just about all of
them are,, I don't understand what you are saying,, trust me I know
what a processor. You're up against it here, and totally outmanned,
don't press the argument I will embarrass you further.
Tell me, Eddy... what do you define as 'processor' controlled?
I do controls for a living, and I've retro'd a bunch of crappy HVAC
systems for better performance, and MOST conventional units I've seen
have CRAP for control.
Sure... it's a electronically modulated device. The key is... what is
telling the device to modulate in first place? Is it a single
operational parameter... a couple of them... or dozens?
A EXV taking simple feedback from a single process variable is nothing
more than a fancy TXV... in my humble opinion.
Its depends on the application, and manufacturer.... a dozen years ago I got
to play with some Carrier 40ton air cooled chillers that had EXVs on them
that were controlled by a bunch of thermisters and a 386 motherboard with a
couple of E-Proms
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