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A counterflow, concentric tube heat exchanger used for engine cooling has been in service for an extended period of lime. The heat transfer surface area of the exchanger is
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Fundamentals of Heat and Mass Transfer
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- Water flowing in a long, aluminum lube is to be heated by air flowing perpendicular to the exterior of the tube. The ID of the tube is 1.85 cm, and its OD is 2.3 cm. The mass flow rate of the water through the tube is 0.65kg/s, and the temperature of the water in the lube averages 30C. The free-stream velocity and ambient temperature of the air are 10m/sand120C, respectively. Estimate the overall heat transfer coefficient for the heat exchanger using appropriate correlations from previous chapters. State all your assumptions.arrow_forwardTask 2A heat exchanger that is used for cooling lubricating oil is comprised of a thin-walled inner tube of 30mm diameter carrying water and an outer tube of 50 mm diameter carrying the oil. The exchanger operates in counterflow mode with an overall heat transfer coefficient of 65 W/m2 K and the tabulated average properties are given. (a) If the outlet temperature of the oil is 60°C, determine the total heat transfer and the outlet temperature of the water.(b) How long must the tube be made if the outlet temperature of the oil is 60°C?(c) Explain and discuss with the use of diagrams the difference between parallel and counter flow heat exchangers?(d)If the heat exchanger is changed to a parallel flow heat exchanger, how long must the tube be made if the outlet temperature of the oil is 60°C?arrow_forwardWhy does a “mixed” or “unmixed” fluid arrangement influence heat-exchanger performance?arrow_forward
- The condenser of a large thermal power plant is a body-tube type heat exchanger consisting of a single body and 30000 pipes with two passes each. The pipes are thin-walled with an inner diameter of 25 mm, and steam condenses on the outer surfaces of the pipes with a convection coefficient of 11000 W / m2.K. The heat transfer required by the heat exchanger is 2000 MW, and it is provided by the flow of water through the pipes at a flow rate of 30000 kg / h. Water enters at 20 ° C, steam condenses at 50 ° C. Calculate the temperature of the cooling water leaving the condenser? Determine the required pipe length per pass? The properties of water at Tort = 300 K; Cp = 4180 j / kgK, μ = 855 × 10--6 Ns / m2, k = 0.613 W / mK, Pr = 5.83.arrow_forward1. A shell-and-tube heat exchanger is used to heat oil with hot water. The shell fluid is water that enters at 90°C. The oil is heated from 15°C to 59°C. The water exits the heat exchanger at 60°C. If the heat exchanger area is 22.0 m² with an overall heat transfer coefficient of 321 W/m K, what is the heat transfer across the heat exchanger? Use a correction factor of 0.80. Draw the temperature profile in your solution sheet. Express your answer in kW.arrow_forwardA counterflow double-tube heat exchanger with hot engine oil fluid at inlet and outlet temperatures of 190°C and 60°C, respectively, and a flow rate of 0.65 kg/s. While cold engine oil at a flow rate of 1.05 kg/s has an exit temperature of 149°C and Cp-1.84 kJ/kg.K. It is known that the overall heat transfer coefficient is 305 W/m².K. Determine the heat transfer surface area of the heat exchanger.arrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning