=+14-25.

Estimate the average heat-transfer coefficient for evaporating refrigerant 22 in 8.5 mm I.D.

tubes that are 2 m in length. The mass velocity of the refrigerant is 200 kg/(s-m2), and the pres-

sure and quality at the inlet are 210 kPa and 30 percent, respectively. Saturated vapor exits from the tubes.