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A cross-flow heat exchanger is used to heat water in an industrial plant (Figure 4). Hot air, at a temperature of 180 °C
Posted: Thu Jun 02, 2022 10:20 am
by answerhappygod
- A Cross Flow Heat Exchanger Is Used To Heat Water In An Industrial Plant Figure 4 Hot Air At A Temperature Of 180 C 1 (97.39 KiB) Viewed 15 times
A cross-flow heat exchanger is used to heat water in an industrial plant (Figure 4). Hot air, at a temperature of 180 °C, enters the exchanger at a flow rate of 0.10 kg s1 and a flow speed of 2.0 m s1. The water has a flow rate of 0.08 kg s1 in the tube, which has an outer diameter of 25 mm, is 1.0 mm thick and is 100 m long in total. The inlet temperature of the water is 14 °C. air in air out water in water out Figure 4 Schematic diagram of the cross-flow heat exchanger a. Calculate the U-value from the fluid flow information, clearly stating any assumptions you make. (16 marks) b. Evaluate the NTU and determine the effectiveness, &, from the appropriate chart. (6 marks) c. Determine (i) the heat transfer rate (in kW) of the heat exchanger and (ii) the outlet temperatures. (4 marks) d. State your assumptions and discuss their validity. (4 marks)