In order to reduce thermal pollution in a lake, a heat exchanger will be used to reduce the output temperature of the coolant water discharge at an industrial facility. The heat exchanger is to cool the discharge water from 100° F to 65° F. The mass flow rate of the discharge water to be cooled in the heat exchanger is 50,000 lbm/hr.
Although a wide variety of heat exchanger designs are available for such applications, consider two common heat exchanger designs; a water-cooled shell and tube heat exchanger, and an extended surface (finned) air cooler. Assume that the water and air on the cold side of both heat exchangers is initially at 50° F.
Prepare a report detailing your design. This report should include the following information:
- Size of the required shell and tube heat exchanger (number of tubes, number of passes, shell diameter, tube diameter, tube length, etc.).
- Size of the required air-cooler (number of tubes, type and configuration of external fins, u-bundle tube diameters, tube length, etc.). Assume natural convection on the air side of the exchanger.
- Estimates of the effectiveness (e), the NTUs, and the overall heat transfer coefficient for each heat exchanger.
- A recommendation of the heat exchanger design your group believes to be the best for the situation, including a list of reasons justifying your recommendation. (This will count as a significant portion of the project grade and should not be treated trivially.)
Make use of the heat exchanger design literature that I have given your group, along with that available in the library, as it will greatly reduce the amount of effort required to complete this project. Carefully reference all sources of information you used during the design and analysis in your report.
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