is pumped by a variable speed gear pump. The refrigerant then
passes in series through a filter/dryer, a refrigerant flow meter,
pre-heater, sight glass tube, and enters the test section attached
to the rigid frame having adjustable connector which is served
for channel orientation purpose. Horizontal flow and vertical upward
flow are conducted in current work. The inlet quality before
entering the test section is controlled by the pre-heater with a DC
power supply used to apply heat. Leaving the test section, the