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

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

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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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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