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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Chapter 1, Problem 1.14P

Air at a mean temperature of 50 F flows over a thin-wall 1-in. O.D. tube, 10 feet in length, which has condensing water vapor flowing inside at a pressure of 14.7 psia. Compute the heat transfer rate if the average heat transfer coefficient between the air and tube surface is 10 Btu/ ( hr-ft 2 -F ) .

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3. Water at an average bulk temperature of 80 F flows inside a horizontal smooth tube with wall temperature maintained at 180 F. The tube length is 6 ft and the diameter is 0.5 in. The flow velocity is 0.4 ft/s. Calculate the heat transfer rate. For water, c = 1 Btu/lb-F and k = 4.27 Btu- in/hr-ft2-F. *
Twelve liters per minute of hot water at 330 K flow through a 0.5 inch schedule 40 (0.622 in wall thickness) domestic hot water line. What is the heat transfer coefficient inside the pipe? The kinematic viscosity is 0.5 x 106. The Prandtl number is 3.2.
QUESTION 3 A multi-stage steam turbine exhausts into a two-pass surface condenser operating at a pressure of 10kPa. The steam enters the condenser with a dryness fraction of 0.85 and the condensate leaves the condenser at a temperature of 34.6°C. The tubes have an inside diameter of 18mm and a wall thickness of 1mm. Coolina water circulates through the tubes at a speed of 1.2m/s. The stean flows through the condenser at a rate of 2400kg/hr and air leaks into the system at a rate of 0.5kg/1000kg of steam condensed. Calculate: 3.1 the capacity of the air pump in m2/min.

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Heating Ventilating and Air Conditioning: Analysis and Design

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