Pro/Forums - View Single Post - Evaluate my plan for the phase change setup

Enyin · 02-24-2003, 10:26 PM

Hi Hydrogen 18,

Don't give up sir! Just looking at the views on this thread you can see that lots of people are interested in your plan - the fact is we all probably have our own plan but are struggling with some of the same questions as you.

Especially when it comes to sizing condensers, evaporators and cap tubes you will probably not be able to do the calculations to do it the technically correct way - I've spoken with the 'friendly HVAC technician' they generally just repair systems and haven't done this stuff since they took classes 15 years ago - the systems they put together have parts specified by the manufacturer, they don't normally do what we're doing and are *usually* not engineers with the capability of designing systems from scratch

If you really want to get into the calculations take a look at this guy's site, he's seriously hardcore:
http://home.attbi.com/~prithabrownin.../chiller1.html
q= Usystem x Aheat exchanger x ÄTlog mean = OMG

I have not seen one computer related phase change site / project that documents the calculations on sizing these parts - it really comes down to some guesswork - try rparts.com for cap tube sizing, they have a decent chart.

Also put a sight glass before your cap tube so you can make sure you're getting 100% liquid from your condenser, and put another sight glass before the suction inlet on your compressor so you can make sure you're not getting liquid into the compressor. Once you've done that you can adjust the other parts till you get what you want. Soft copper tubing = Mucho Cheap!!

02-24-2003, 10:26 PM	#25
Enyin Cooling Neophyte Join Date: Feb 2003 Location: NJ, USA Posts: 22	re: pc Hi Hydrogen 18, Don't give up sir! Just looking at the views on this thread you can see that lots of people are interested in your plan - the fact is we all probably have our own plan but are struggling with some of the same questions as you. Especially when it comes to sizing condensers, evaporators and cap tubes you will probably not be able to do the calculations to do it the technically correct way - I've spoken with the 'friendly HVAC technician' they generally just repair systems and haven't done this stuff since they took classes 15 years ago - the systems they put together have parts specified by the manufacturer, they don't normally do what we're doing and are usually not engineers with the capability of designing systems from scratch If you really want to get into the calculations take a look at this guy's site, he's seriously hardcore: http://home.attbi.com/~prithabrownin.../chiller1.html q= Usystem x Aheat exchanger x ÄTlog mean = OMG I have not seen one computer related phase change site / project that documents the calculations on sizing these parts - it really comes down to some guesswork - try rparts.com for cap tube sizing, they have a decent chart. Also put a sight glass before your cap tube so you can make sure you're getting 100% liquid from your condenser, and put another sight glass before the suction inlet on your compressor so you can make sure you're not getting liquid into the compressor. Once you've done that you can adjust the other parts till you get what you want. Soft copper tubing = Mucho Cheap!!