Hot air is used to heat cold water from 35°C to 95°C in a finned-tube heat exchanger similar to the one shown in Figure 5.31. The water flows in the tubes at a flow rate of 1.9 kg/s. The air, at 1 atm, enters the heat exchanger at 210°C and leaves at 100°C. The overall heat transfer coefficient for the heat exchanger is 185 W/m2-K.
Determine the air-side area required for this heat exchanger.

Transcribed Image Text:

300 Air passing through the fins FIGURE 5.31 Example of a continuous plane finned tube cross flow heat exchanger. Liquid flowing through the tubes