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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? (Cpoil = 2131 J/kg K, 4187 J/kg K, Cpwater hi = 2250W/m2K, ho = 38.8 W/m2K)

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? (Cpoil = 2131 J/kg K, 4187 J/kg K, Cpwater hi = 2250W/m2K, ho = 38.8 W/m2K)

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
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 10.13P
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3. A certain superinsulation material having a thermal conductivity of 2x10 mW/m °C is used to insulate a tank of liquid nitrogen that is maintained at -196 °C; 199 kJ is required to vaporize each kilogram mass of nitrogen at this temperature. Assuming that the tank is a sphere having an inner diameter (ID) of 0.52 m, estimate the amount of nitrogen vaporized per day for an insulation thickness of 2.5 cm and an ambient temperature of 21 °C. Assume that the outer temperature of the insulation is 21 °C.
Transcribed Image Text:3. A certain superinsulation material having a thermal conductivity of 2x10 mW/m °C is used to insulate a tank of liquid nitrogen that is maintained at -196 °C; 199 kJ is required to vaporize each kilogram mass of nitrogen at this temperature. Assuming that the tank is a sphere having an inner diameter (ID) of 0.52 m, estimate the amount of nitrogen vaporized per day for an insulation thickness of 2.5 cm and an ambient temperature of 21 °C. Assume that the outer temperature of the insulation is 21 °C.
2. 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? (Cpoil = 2131 J/kg K, 4187 J/kg K, Cpwater hi = 2250W/m2K, ho = 38.8 W/m2K)
Transcribed Image Text:2. 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? (Cpoil = 2131 J/kg K, 4187 J/kg K, Cpwater hi = 2250W/m2K, ho = 38.8 W/m2K)
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