Originally Posted by
wdrzal
Not flooded, Keeping ALL surfaces wetted is best,but not flooded.The refrigerant needs room to expand.......400:1 to 1700:1 depending on refrigerant.......well not exactly as part of the expansion is what increases the velocity (700fpm horizontal/1400 fpm vertical) it does need increasing a bit,but not too too much. See how different refrigerants affect velocity so piping along with evaporator passages needs sized correctly.
I believe all this accumulator stuff is not needed, guessit depend on piping and how well total package is designed.people are over charging,or the suction velocity is way to high or both. Way to much refrigerant is boiling off in the suction line,and in some cases I see uninsulated lines completely iced along with accumulators even a portion of the compressor:eek: . If thats the case I bet a portion of the evap is completely flooded.
All this mixing of gases and no one has any idea of sub-cooling or superheat which are 2 very important things you need to know....... If you don't even know the basics or even have a way to reproduce the mix ,as most don't.How can you move forward?????? Even if you made a specific mix and had a P/T chart made,I,m betting most of the Low temp gases only make the "no load" number look good but does nothing for "loaded temps" that count. If fact some of the gases aren't condensing @ all or just a very very little in the 2 phase flow in single stages and making the cap tube or other metering device less effective thus the evap. They are just taking up the precious little real estate inside a evap where a highly efficient refrigerant should be adsorbing as much heat as possible........
I'm getting a itch to build a rig to determine for myself ........Doing 2 things first........1; building something close to the norm and produce results as most are, then measuring parameters most can't measure............................2; Then approach the problem with a clean white sheet analysis,seeing if a better approach is possible whether its just a improvement of the current path or a radical new approach forgetting everything I read & seen on XS .With the sole intent of keeping current loads as low as possible temperature wise ...........All awhile keeping in mind it has to be done on a reasonable budget.
Of course this is dependent on my available time & Energy, but I,m getting a itch to be "Noob of 1338" :D :shocked: :shrug: I must be going :nuts: . No promises and No time schedule as work both professional and private has a large back log from taking 5 years off to care for my parents(98 to 03)when they needed me,plus my own recent health issues.
Please don't start asking every week or month if I started anything Yet,I'll be the first to let you know when I do,but will probable be to wards fall and over the winter. I have a new very efficient central air/w heat pump to install at my home first.It will be using a 2 speed hermetic scroll compressor.Low speed on not so hot or cold days and high speed when full output is needed. Maybe a 2 speed low temp compressor is needed for phase ??????? :shrug: :shrug: :shrug: or :idea: a special custom proprietary built compressor all together?????? who knows, their a lot of possibilities and different ways of making things cold :yepp:,other than whats being done on XS. .
