Trading BTU's

[smilies]

Look at this pic, there are 2 subcoolers like this in every case. No mechanical subcooling at rack.

http://usera.imagecave.com/smilies13/misc009.jpg

To me it looks like the ALCO ALLS is just trading BTU's from the flash gas to the liquid line, no real gain. I'm told these are specific to the chain I was at, something they spec'd. Anyone have 'inside' info, actual effectiveness of this setup?

[750 Valve]

what a waste, trading btu's for sure with no real gain.

Have a read here (http://www.refrigeration-engineer.com/forums/showthread.php?t=669) as it seems you must be at the same supermarket chain.

[smilies]

Thanks, 750, that was a read.

[Dan]

Hmmm... Tyler cases? Albertson's?

The purpose ofthe Alls was to insure a solid liquid feed. This is wherein its merit lay. Traditional heat exchangers use suction gas to simply treate the "raw" liquid entering the TEV. The amount of heat exchange was often too little and flash gas would arrive at the TEV. The "ALLS" would use the flashing liquid to aggressively reduce the liquid entering the TEV. For this purpose, the ALLS pretty much worked... until you just didn't have sufficient vapor to permit the required mass flow.:(






what a waste, trading btu's for sure with no real gain.

Have a read here as it seems you must be at the same supermarket chain.

Hi, 750. You are correct regarding the 1-for-1 exchange.

However... if you are productively removing the heat from the liquid line... meaning that you are warming up the suction line which will cause it to absorb less heat on it's way to the compressor... then that's a different story.

If you have a suction line that gains no heat from the evaporator to the compressor, you have an efficiency advantage compared to systems with cold suction lines gaining heat along the way toward the compressors.