The motive and the suction mass flow rates are measured
by volumetric flow meters (Bailey F and P, 10A3225)
located downstream of the sight glass and of the liquid–
vapor separator, respectively. All flow meters are specially
calibrated for R-134a from the manufacturer (Bailey F and
P). The total capacity of all refrigerant flow meters is 0.3 to
3.3 LPM. The manufacturer’s listed accuracy is 0.1% of the
full scale. The temperatures are measured by T-type
thermocouples having accuracy of 0.1 8C. All the temperature-
measuring devices are well calibrated in a controlled
temperature bath using standard precision mercury glass
thermometers. Bourdon gauges, calibrated against the dead
weight test, are used to measure the pressures. All static
pressure taps are mounted flush in the tube wall.