Q6 Air, at a temperature of 32°C passes through a heat exchanger at a velocity of 3 m/s, and its temperature is raised to 37°C. It then enters a turbine at the same velocity of 3 m/s and expands until the temperature falls to 31°C. On leaving the turbine, the air is taken at a velocity of 1.5 m/s to a nozzle, where it expands until the temperature has fallen to 28°C. If the air flow rate is 12 x10-2 kg/s, calculate: (i) The rate of heat transfers to the air in the heat exchanger; (ii) The power output from the turbine assuming no heat loss and; (iii) The velocity at the exit from the nozzle, assuming no heat loss. Take the enthalpy of air as h = Cpt, where Cp is 1.005 kJ/kg K and “t” is the temperature.
Q6 Air, at a temperature of 32°C passes through a heat exchanger at a velocity of 3 m/s, and its temperature is raised to 37°C. It then enters a turbine at the same velocity of 3 m/s and expands until the temperature falls to 31°C. On leaving the turbine, the air is taken at a velocity of 1.5 m/s to a nozzle, where it expands until the temperature has fallen to 28°C. If the air flow rate is 12 x10-2 kg/s, calculate: (i) The rate of heat transfers to the air in the heat exchanger; (ii) The power output from the turbine assuming no heat loss and; (iii) The velocity at the exit from the nozzle, assuming no heat loss. Take the enthalpy of air as h = Cpt, where Cp is 1.005 kJ/kg K and “t” is the temperature.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Q6 Air, at a temperature of 32°C passes through a heat exchanger at a velocity of 3 m/s, and its temperature is raised to 37°C. It then enters a turbine at the same velocity of 3 m/s and expands until the temperature falls to 31°C. On leaving the turbine, the air is taken at a velocity of 1.5 m/s to a nozzle, where it expands until the temperature has fallen to 28°C. If the air flow rate is 12 x10-2 kg/s,
calculate:
(i) The rate of heat transfers to the air in the heat exchanger; (ii) The power output from the turbine assuming no heat loss and; (iii) The velocity at the exit from the nozzle, assuming no heat loss.
Take the enthalpy of air as h = Cpt, where Cp is 1.005 kJ/kg K and “t” is the temperature.
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