Saturated refrigerant R134a at 0°C enters a tube of outer diameter 50 mm and height 0.8 m at the bottom, with a quality of 0.2. The mass flow rate of the refrigerant is 0.025 kgsí1 . Saturated steam...

Saturated refrigerant R134a at 0°C enters a tube of outer diameter 50 mm and height 0.8 m at the bottom, with a quality of 0.2. The mass flow rate of the refrigerant is 0.025 kgsí1 . Saturated steam at 8°C condenses on the outside of the tube. (i) Assuming the tube wall to be at a uniform temperature of 4°C, calculate the average laminar condensation heat transfer coefficient. (ii) Calculate the total steam condensation rate. (iii) Calculate the quality of the refrigerant leaving the tube at the top.