A counterflow, concentric tube heat exchanger is used to cool the lubricating oil for a large industrial gas turbine engine. The flow rate of cooling water through the inner tube (D; = 20 mm) is 0.5 kg/s, while the flow rate of oil through the outer tube (Do = 45 mm) is 0.3 kg/s. The oil and water enter at temperatures of 100 and 30°C, respectively. Given the C, for water is 4200 J/kg.k and C, for the oil is 1900 J/kg.k. In addition, the convection coefficient of heat transfer for the water is 1500 W/m² and the convection coefficient of heat transfer for the oil is 300 W/m A) What is the main difference between parallel and counter flow heat exchangers? B) How long must the tube be made if the outlet temperature of the oil is 60°C?

A counterflow, concentric tube heat exchanger is used to cool the lubricating oil for a large industrial gas turbine engine. The flow rate of cooling water through the inner tube (D; = 20 mm) is 0.5 kg/s, while the flow rate of oil through the outer tube (Do = 45 mm) is 0.3 kg/s. The oil and water enter at temperatures of 100 and 30°C, respectively. Given the C, for water is 4200 J/kg.k and C, for the oil is 1900 J/kg.k. In addition, the convection coefficient of heat transfer for the water is 1500 W/m² and the convection coefficient of heat transfer for the oil is 300 W/m A) What is the main difference between parallel and counter flow heat exchangers? B) How long must the tube be made if the outlet temperature of the oil is 60°C?

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 10.32P

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A counterflow concentric tube heat exchanger is used to cool the lubricating oil from a large gas turbine engine. The flow rate of cooling water through the inner tube (Di = 25 mm) is 0.2 kg/s, while the flow of oil through the outer annulus (Do = 45 mm) is 0.1 kg/s. The oil and water enter at temperatures of 100°C and 30°C respectively. What is the heat transfer rate, and the overall convective heat transfer coefficient between fluids? Assuming negligible heat loss in the surrounding and negligible tube wall resistance and how long must the tube be made if the required outlet temperature of the oil is 60°C? (Cp oil = 2131 J/kg K, Cp water = 4187 J/kg K, hi = 2250W/m2K, ho = 38.8 W/m2K)