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Two engineers are having an argument about the efficiency of a tube-side multipass heat exchanger compared to a similar exchanger with a single tube-side pass. Smith claims that for a given number of tubes and rate of heat transfer, more area is required in a two-pass exchanger than in a one pass, because the effective temperature difference is less. Jones, on the other hand, claims that because the tube-side velocity and hence the heat transfer coefficient are higher, less area is required in a two-pass exchanger. With the conditions given below, which engineer is correct? Which case would you recommend, or what changes in the exchanger would you recommend? Exchanger specifications: 200 tube passes total 1-inch OD copper tubes, 16 BWG Tube-side fluid: water entering at 16°C, leaving at 28°C, at a rate of 225,000 kg/h Shell-side fluid: Mobiltherm 600, entering at 50°C, leaving at 33°C shell-side coefficient = 1700 W/m2 K A. U = 1091 W/m2K, U = 1288 W/m2K, 148 m?, 138 m2 B. U = 1091 W/m2K, U = 1288 W/m?K, 148 m?, 138 m? C. U = 1091 W/m²K, U = 1288 W/m2K, 148 m?, 138 m? D. U = 1091 W/m?K, U = 1288 W/m2K, 148 m2, 138 m2

Two engineers are having an argument about the efficiency of a tube-side multipass heat exchanger compared to a similar exchanger with a single tube-side pass. Smith claims that for a given number of tubes and rate of heat transfer, more area is required in a two-pass exchanger than in a one pass, because the effective temperature difference is less. Jones, on the other hand, claims that because the tube-side velocity and hence the heat transfer coefficient are higher, less area is required in a two-pass exchanger. With the conditions given below, which engineer is correct? Which case would you recommend, or what changes in the exchanger would you recommend? Exchanger specifications: 200 tube passes total 1-inch OD copper tubes, 16 BWG Tube-side fluid: water entering at 16°C, leaving at 28°C, at a rate of 225,000 kg/h Shell-side fluid: Mobiltherm 600, entering at 50°C, leaving at 33°C shell-side coefficient = 1700 W/m2 K A. U = 1091 W/m2K, U = 1288 W/m2K, 148 m?, 138 m2 B. U = 1091 W/m2K, U = 1288 W/m?K, 148 m?, 138 m? C. U = 1091 W/m²K, U = 1288 W/m2K, 148 m?, 138 m? D. U = 1091 W/m?K, U = 1288 W/m2K, 148 m2, 138 m2

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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Two engineers are having an argument about the efficiency of a tube-side multipass heat exchanger compared to a similar exchanger with a single tube-side pass. Smith claims that for a given number of tubes and rate of heat transfer, more area is required in a two-pass exchanger than in a one pass, because the effective temperature difference is less. Jones, on the other hand, claims that because the tube-side velocity and hence the heat transfer coefficient are higher, less area is required in a two-pass exchanger. With the conditions given below, which engineer is correct? Which case would you recommend, or what changes in the exchanger would you recommend? Exchanger specifications: 200 tube passes total 1-inch OD copper tubes, 16 BWG Tube-side fluid: water entering at 16°C, leaving at 28°C, at a rate of 225,000 kg/h Shell-side fluid: Mobiltherm 600, entering at 50°C, leaving at 33°C shell-side coefficient = 1700 W/m2K A. U = 1091 W/m2K, U = 1288 W/m2K, 148 m², 138 m? B. U= 1091 W/m?K, U = 1288 W/m?K, 148 m?, 138 m? C. U = 1091 W/m?K, U = 1288 W/m?K, 148 m?, 138 m2 D. U = 1091 W/m?K, U = 1288 W/m2K, 148 m?, 138 m?
Transcribed Image Text:Two engineers are having an argument about the efficiency of a tube-side multipass heat exchanger compared to a similar exchanger with a single tube-side pass. Smith claims that for a given number of tubes and rate of heat transfer, more area is required in a two-pass exchanger than in a one pass, because the effective temperature difference is less. Jones, on the other hand, claims that because the tube-side velocity and hence the heat transfer coefficient are higher, less area is required in a two-pass exchanger. With the conditions given below, which engineer is correct? Which case would you recommend, or what changes in the exchanger would you recommend? Exchanger specifications: 200 tube passes total 1-inch OD copper tubes, 16 BWG Tube-side fluid: water entering at 16°C, leaving at 28°C, at a rate of 225,000 kg/h Shell-side fluid: Mobiltherm 600, entering at 50°C, leaving at 33°C shell-side coefficient = 1700 W/m2K A. U = 1091 W/m2K, U = 1288 W/m2K, 148 m², 138 m? B. U= 1091 W/m?K, U = 1288 W/m?K, 148 m?, 138 m? C. U = 1091 W/m?K, U = 1288 W/m?K, 148 m?, 138 m2 D. U = 1091 W/m?K, U = 1288 W/m2K, 148 m?, 138 m?
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