6.2kg/s of propanol is cooled with water in a shell and tube heat exchanger. The exchanger has one shell with 10 tubes and 2 tube passes. The overall heat transfer coefficient of the exchainger is 352 W/(m²-K). The water is flowing through the tubes. The length of a tube is 30.6 m. The propbanol is cooled from 150 °C to 95°C. The inlet temperature of the water is 16 °C and its mass flow rate is 2.0 kg/s. Calculate the diameter of the tubes in cm. Type your answer in the first box. Propanol properties: Cp = 2380 J/(kg-K) Water Properties: Cp = 4147 J/(kg-K)

Water enters at 20 °C at a rate of 0.1 kg/s in a double-pipe counter flow heat exchanger is to be heated by hot air that enters the heat exchanger at 110 °C at a rate of 0.3 kg/s. The overall heat transfer coefficient based on the inner side of the tube to be 100 W/m2. °C. The length of the tube is 14 m, and the internal diameter of the tube is 1.4 cm. Determine the outlet temperature of the water. The specific heats of the water and air are given to be 4.18 and 1.01 kj/kg.°C, respectively. Select one: O a. 31.3 °C O b. 22.6 °C O C. 24.7 °C O d. 25.5 °C

A thin-walled double-pipe counter-flow heat exchanger is to be used to cool oil (Cpo= 2200 J/kg.K) from 150°C to 40°C at a rate of 2 kg/s by water (Cpw= 4180 J/kg.K) that enters at 22°C at a rate of 1.5Kg/s. If the diameter of the tube is 2.5 cm, and its length is 6 m, determine * The rate of heat transfer in the heat exchanger * The outlet temperature of the cold fluid * The Log Mean Temperature Difference (LMTD) * The overall heat transfer coefficient

A long, thin-walled double-pipe heat exchanger with tube and shell diameters of 0.01 m and 0.025 m, respectively, is used to condense refrigerant-134a with water at 20°C. The refrigerant flows through the tube, with a convection heat transfer coefficient of hi= 4100 W/m² °C. Water flows through the shell at a rate of 0.3 kg/s. The thermal resistance of the inner tube is negligible since the tube material is highly conductive and its thickness is negligible. Both the water and refrigerant-134a flows are fully developed. Properties of the water and refrigerant-134a are constant. Water properties: p = 998 kg/m³, v=u/p-1.004x 10-6 m²/s, k = 0.598 W/m. °C, Pr = 7.01 Cold water D Do