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 1.11P
Compute the heat transferred from water as it flows through a heat exchanger at a steady rate of 1 m3/s. The decrease in temperature of the water is 5 C, and the mean bulk temperature is 60 C. Use SI units.
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In a heat exchanger, water flows through a long copper tube (inside diameter 2.2 cm) with an average velocity of 2.13 m/s. The water is heated by steam condensing at 150 degree celsius on the outside of the tube. Water enters at 15 degree Celsius and leaves at 60 degree Celsius . What is the heat transfer coefficient, h, for the water? Write the given, required and solution
A steam condenser receives 10 kg per second of steam with an enthalpy of 2570 KJ/kg. Steam condenses into liquid and leaves with an enthalpy of 160 KJ/kg, if cooling water passes through the condenser with temperature increases from 13oC to 24oC. Calculate the cooling water flow rate in kg/sec.
Show conversion of units pls
4. The following heat exchanger uses 10 kg/s of hot air to heat and boil liquid water into
saturated steam at 500 kPa.
(a) Find the steam flow (kg/s)
(b) Determine whether the process is allowed by the second law (Answer: It is not!)
(c) On the surface, the process looks OK as Tair>Twater at both the inlet and outlet. You
should be able to see the problem if you sketch the air and the water temperature
profiles as you move left to right through the exchanger. (Hints: The air will be essentially
a straight line, while the water will not. For the water, think about what happens when it
is changing phase.) This is called a pinch point violation, and it is a very important design
consideration in advanced combined cycle systems and in nuclear power plants.
Air
100 kPa
160°C
10 kg/s
Saturated Vapor
500 kPa
Air: 160°C
Steam: 151.8°C
Q
Air
100 kPa
30°C
Liquid Water
500 kPa, 20°C
Air: 30°C
Water: 20°C
Chapter 1 Solutions
Heating Ventilating and Air Conditioning: Analysis and Design
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