(a) A counter-flow double pipe heat exchanger is employed to heat up water from 20 to...
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(a) A counter-flow double pipe heat exchanger is employed to heat up water from 20 to 85°C which flows in the inner tube at a rate of 4.2 kg/s. The heating is to be accomplished by oil from a power installation. This hot oil enters at 180°C at a mass flow rate of 3.5 kg/s. The inner tube is thin walled and has a diameter of 1.25 cm. The overall heat transfer coefficient of the heat exchanger is 7200 W m² K¹. Calculate the length of the heat exchanger. The heat capacities: Cp (water) = 4180 J/(kg-K) Cp (oil) = 3150 J/(kg-K) [14 marks] (b) The initial temperature distribution across a wall with a thickness of 0.3 m is described with the following function: T(x) = 200-200x + 30x², where Tis temperature in degrees Celsius and x is the coordinate in meters. The wall has a thermal conductivity of 1 W m¹¹ K¹. (0) On a unit surface area basis, determine the heat flux into the wall on the left face (x=0 m) [3 marks] (ii) On a unit surface area basis, determine the heat flux out of the wall on the right face (x = 0.3 m) [3 marks] (a) A counter-flow double pipe heat exchanger is employed to heat up water from 20 to 85°C which flows in the inner tube at a rate of 4.2 kg/s. The heating is to be accomplished by oil from a power installation. This hot oil enters at 180°C at a mass flow rate of 3.5 kg/s. The inner tube is thin walled and has a diameter of 1.25 cm. The overall heat transfer coefficient of the heat exchanger is 7200 W m² K¹. Calculate the length of the heat exchanger. The heat capacities: Cp (water) = 4180 J/(kg-K) Cp (oil) = 3150 J/(kg-K) [14 marks] (b) The initial temperature distribution across a wall with a thickness of 0.3 m is described with the following function: T(x) = 200-200x + 30x², where Tis temperature in degrees Celsius and x is the coordinate in meters. The wall has a thermal conductivity of 1 W m¹¹ K¹. (0) On a unit surface area basis, determine the heat flux into the wall on the left face (x=0 m) [3 marks] (ii) On a unit surface area basis, determine the heat flux out of the wall on the right face (x = 0.3 m) [3 marks]
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Given water Double pipe heat Exchanger mais flow rate m 42 kgs Specific heat p 4180 ... View the full answer
Related Book For
Fundamentals of Thermal-Fluid Sciences
ISBN: 978-0078027680
5th edition
Authors: Yunus A. Cengel, Robert H. Turner, John M. Cimbala
Posted Date:
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