Originally Posted by
RLK
Chef, I do not understand the high super heat this compressor has been used with one TXV on systems with four plates in series and one system with two plates containing 37 gallons of eutectic solution. Two to three hours running the first day with warm boxes yes but there after one hour or less will freeze plates solid again. For plates to hold over 24 hours good insulation is needed and freezer plates needs one gallon of solution for each cubic ft of freezer and ½ gallon for each cubic ft of refrigerator. I believe that compressor suction and high pressure on second days one hour run along with frosted on lines profiles a holding plates system performance. Again a holding plate is not an evaporator it is a energy storage unit. I would like to see the second day pressures and frost areas recorded every 10 minutes for one hour. Then after a couple of hours at rest record parameters again with valve sense bulb hanging lose from line in box. When doing wide open orifice test monitor compressor and stop compressor if frost forms more than one inch down rear plate of compressor. Here is a two hour sample of readings from a balanced system although your reading will not be the same it is the profile changes that defines refrigerant flow. Typical High pressure every 10 min, 135,125,115,100,90,90,90,90.90,90.90,90. Low suction pressure,22,17,12,8,5.3,3,3,1,1,0.-1. Line areas frosted, TXV outlet line, plate connecting tubes and return line to compressor, 20 min line frosted between plates 1 and 2 and frost on return line to compressor, after 20 min no frost on compressor return line.
The SeaFrost people are well respected in the boat refrigeration industry. I bought a new Watkins 32 sailboat in 1983 and installed a used 1978 Sankyo SD508 compressor and it is still ticking today. I can’t post my web site here but Google my name and you will find my site.
Richard Kollmann.