Question 1 En. Karim recently bought a heat exchanger for his metal factory. The heat exchanger is a cross-flow type which has cross section size of 1 m X 1 m. En. Karim assigned you to calculate the effectiveness of the heat exchanger. As an engineer, you decided to do the analysis based on section by section. One section of the heat exchanger duct consists 3 cm diameter of 80 tubes. Cold water (cp = 4180 J/kg.K) enters the tube at 18°C. The average velocity of the cold water is 3 m/s. Meanwhile, hot air (c, = 1010 %3D J/kg.K) enters the section at 130°C and 105 kPa. The velocity of the hot air is 12 m/s and air constant, R is 0.287 kJ/kg.K. If the overall heat transfer coefficient is 130 W/m2.K, determine i. the mass flow rates of both cold water and hot air, ii. the rate of heat transfer, iii. the effectiveness of the heat exchanger (NTU method), iv. the actual rate of heat transfer, and v. the outlet temperatures of both cold water and hot air.

Question 1 En. Karim recently bought a heat exchanger for his metal factory. The heat exchanger is a cross-flow type which has cross section size of 1 m X 1 m. En. Karim assigned you to calculate the effectiveness of the heat exchanger. As an engineer, you decided to do the analysis based on section by section. One section of the heat exchanger duct consists 3 cm diameter of 80 tubes. Cold water (cp = 4180 J/kg.K) enters the tube at 18°C. The average velocity of the cold water is 3 m/s. Meanwhile, hot air (c, = 1010 %3D J/kg.K) enters the section at 130°C and 105 kPa. The velocity of the hot air is 12 m/s and air constant, R is 0.287 kJ/kg.K. If the overall heat transfer coefficient is 130 W/m2.K, determine i. the mass flow rates of both cold water and hot air, ii. the rate of heat transfer, iii. the effectiveness of the heat exchanger (NTU method), iv. the actual rate of heat transfer, and v. the outlet temperatures of both cold water and hot air.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter10: Heat Exchangers

Section: Chapter Questions

Problem 10.18P

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