(a) Classify heat exchangers according to flow type and explain the characteristics of each type.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
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ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter10: Heat Exchangers
Section: Chapter Questions
Problem 10.28P
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Problem # 1:
(a) Classify heat exchangers according to flow type and explain the characteristics of each type.
(b) When is a heat exchanger classified as being compact? Do you think a double-pipe heat exchanger
can be classified as a compact heat exchanger?
(c) Under what conditions can the overall heat transfer coefficient of a heat exchanger be determined
from U= (1/hi + 1/ho)?
(d) Draw a 1-shell-pass and 6-tube-passes shell-and-tube heat exchanger. What are the advantages and
disadvantages of using 6 tube passes instead of just 2 of the same diameter?
(e) What are the heat transfer mechanisms involved during heat transfer from the hot to the cold fluid?
(f) What are the common causes of fouling in a heat exchanger? How does fouling affect heat transfer
and pressure drop?
(g) In the heat transfer relation Q = UA,FATIm for a heat exchanger, what is the quantity F called?
What does it represent? Can F be greater than one?
Problem # 2: Steam in the condenser of a steam power plant is to be condensed at a temperature of 50°C
(hfg = 2305 kJ/kg) with cooling water (Cp=4180 J/kg-°C) from a nearby lake, which enters the tubes of
the condenser at 18°C and leaves at 27°C (see Figure 2-1). The surface area of the tubes is 58 m², and
the overall heat transfer coefficient is 2400 W/m² °C. Determine the mass flow rate of the cooling water
needed and the rate of condensation of the steam in the condenser.
Steam
50°C
27°C
18°C
Water
50°C
Figure 2-1: Schematic for problem 2
Transcribed Image Text:Problem # 1: (a) Classify heat exchangers according to flow type and explain the characteristics of each type. (b) When is a heat exchanger classified as being compact? Do you think a double-pipe heat exchanger can be classified as a compact heat exchanger? (c) Under what conditions can the overall heat transfer coefficient of a heat exchanger be determined from U= (1/hi + 1/ho)? (d) Draw a 1-shell-pass and 6-tube-passes shell-and-tube heat exchanger. What are the advantages and disadvantages of using 6 tube passes instead of just 2 of the same diameter? (e) What are the heat transfer mechanisms involved during heat transfer from the hot to the cold fluid? (f) What are the common causes of fouling in a heat exchanger? How does fouling affect heat transfer and pressure drop? (g) In the heat transfer relation Q = UA,FATIm for a heat exchanger, what is the quantity F called? What does it represent? Can F be greater than one? Problem # 2: Steam in the condenser of a steam power plant is to be condensed at a temperature of 50°C (hfg = 2305 kJ/kg) with cooling water (Cp=4180 J/kg-°C) from a nearby lake, which enters the tubes of the condenser at 18°C and leaves at 27°C (see Figure 2-1). The surface area of the tubes is 58 m², and the overall heat transfer coefficient is 2400 W/m² °C. Determine the mass flow rate of the cooling water needed and the rate of condensation of the steam in the condenser. Steam 50°C 27°C 18°C Water 50°C Figure 2-1: Schematic for problem 2
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