Hi there,

my knowledge on the topic of refrigeration units is basic to say the least - however I have been given the task to size a compressing unit for an experiment that will be under taken.

The system is basic, where a copper coil (1/4" Outer diameter) will be wrapped around a 2" O.D. and 4 foot long hollow steel pipe - insulation will be placed around the system. We hope to pass the refrigerant through the copper coil to cool what will be inside hollow steel pipe (down to as low as -20 degrees Celsius).

Of what I was told from several individuals, only a condensing unit and an expansion valve would be required - however it seems as if the sizing of the condensing unit is the most difficult task at this point in time.

Any help or direction you may be able to provide me would be of enormous help,

thank you for your time!!
Mitch