Heating Ventilating and Air Conditioning: Analysis and Design
Heating Ventilating and Air Conditioning: Analysis and Design
6th Edition
ISBN: 9780471470151
Author: Faye C. McQuiston, Jeffrey D. Spitler, Jerald D. Parker
Publisher: Wiley, John & Sons, Incorporated
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Textbook Question
Chapter 1, Problem 1.13P

Water flowing at a rate of 1.5 kg/s through a heat exchanger heats air from 20 C to 30 C flowing at a rate 2.4 m3/s. The water enters at a temperature of 90 C, and the air is at 0.1 MPa. At what temperature does the water leave the exchanger?

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In a steam-heating system, air is heated by being passed over some tubes through which steam flows steadily. Steam enters the heat exchanger at 30 psia and 400°F at a rate of 15 lbm/min and leaves at 25 psia and 212°F. Air enters at 14.7 psia and 80°F and leaves at 130°F. Determine the volume flow rate of air at the inlet.
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Heating Ventilating and Air Conditioning: Analysis and Design

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  • In large gas-turbine power plants, air is preheated by the exhaust gases in a heat exchanger called the regenerator before it enters the combustion chamber. Air enters the regenerator at 1 MPa and 550 K at a mass flow rate of 800 kg/min. Heat is transferred to the air at a rate of 2700 kJ/s. Exhaust gases enter the regenerator at 140 kPa and 800 K and leave at 130 kPa and 600 K. Treating the exhaust gases as air, determine the exit temperature of the air.
    Air is drawn into the compressor at pressure of 100 kPa and temperature of 22ºC. The volumetricflow rate at the compressor inlet is 0.4 m3/s. The compressor exit pressure is 900 kPa and thecompressor efficiency is 70%. The air leaving the compressor passes through a heat exchangerwhere it is cooled by transferring heat to the atmosphere at 22ºC. The outlet temperature of airafter the heat exchanger is 32ºC. The air passes through a valve and enters a 1 m3 rigid tank. Theinitial pressure and temperature of the air in the tank are 100 kPa and temperature of 22ºC,respectively. The final pressure and temperature of the air in the tank are 900 kPa and temperatureof 90ºC. During the filling process, the tank transfers heat to the surroundings (at 22ºC).Don’t assume constant specific heat.Determinea) The mass flow rate of air entering the compressor, ?̇ (kg/s).b) The rate of power consumed by the compressor, (kW).c) The rate of heat transfer from the heat exchanger to the atmosphere, (kW).d)…
    Water enters the constant 120-mm inside-diameter tubes of a boiler at 7 MPa and 65°C and leaves the tubes at 6 MPa and 450°C with a velocity of 85 m/s. Calculate the velocity of the water at the tube inlet and the inlet volume flow rate.
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