Design of a Cross Flow Heat Exchanger - Engineering Assignment Help

Assignment Task

Design of a Cross flow Heat Exchanger
The purpose of this assignment is to design a cross flow heat exchanger to transfer as much heat as possible between flow of heating oil and a flow of air and its purpose is to allow students to investigate the relationship between heat exchanger duty, flow, geometry and materials.
The cross flow heat exchanger is to comprise a single pass of tubes, information on materials available, recommended heat transfer correlations and heat exchanger effectiveness relationships are provided.
For set inlet temperatures and mass flow rates of two fluids and available materials, students should propose an arrangement that the best heat recovery for a given frontal area (frontal area is defined as the cross sectional area of the channel/duct that the heat exchanger will fit).
As the actual optimisation of a heat exchanger would require many iterations, students should test a number of combinations of tube size, fin size, material type etc, however the marking of this assignment will judge the degree of student enquiry.
The proposed design should also take into account the cost of the final arrangement. (The use of correlations and methods covered in course Heat Exchangers and Heat Transfer is for illustration only as the design of an actual heat exchanger would be more complex. In such an arrangement a multi-pass exchanger would be specified.)

Part A
Provide a final design for a cross flow heat exchanger that recovers the maximum amount of heat for the given specification. Students should include fouling factors that are appropriate for the fluids and context. The analysis must include any assumptions made and evidence that a number of different combinations of materials, tubes and fins have been investigated (include any references cited).
Provide sample calculations for one design, all other designs can be presented in tabular or graphical form. Justify any final design recommended.

Part B
For the chosen design, estimate its performance if the flow rate of the both fluids are reduced by 25%. Supporting calculations must be presented.

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