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Förslaget inkom 2005-02-07

Practical Application of Mathematical Modelling On the copper-base heat exchanger design (gh)

1. General description

An essential, and often the most uncertain, part of any heat exchanger is determination of the overall heat transfer coefficient. This coefficient is defined in terms of the total thermal resistance between fluid and fin surface. Normally, fins-added to surfaces-are often subjected to increase the surface area.
To design or to to predict the performance of a heat exchanger, it is essential to relate the total heat transfer rate to quantities such as inlet and outlet air temperatures, the overall heat transfer coefficient, and the total surface area. This can be done by applying overall energy balance between the hot and cold surfaces, assuming negligible potential and kinetic energy changes.
Optimising heat transfer between fluids and solids is critical in many types of industrial equipment such as cooling element for Micro-Processors. Conventional heat transfer
analysis is often limited by dependence on correlation which are valid only for specific types of equipment and operating ranges.
The solution of problem involving segregated working fluids demands a Conjugate heat transfer (CHT) approach, where calculation of pure thermal conduction through solid material is coupled with the calculation of the temperature in working fluids.

2. Target

The model will ultimately be applied to assist on the design of a new heat exchanger considering the following most important parameters:

- Base material: Copper-base alloy
- Lower cost, comparing with the existing Al-base version
- Smaller size, comparing with the existing Al-base version
- More efficient technology, comparing with the existing Al-base version

3. Objectives and part goals

The model will be used to understanding the effect of different design parameter on the fluid flow, heat transfer and fin efficiency; and finally to have a better control on the cooling process in a micro processors copper-base heat exchanger. This can be done by:
- Modelling of fluid flow; to study the effect of different process variables on the flow pattern and turbulent behaviour,
- Modelling of heat transfer; to optimise the heat transfer to the heat sink,
- To study the fin efficiency in terms of different material and geometry.

The results will also be used to evaluate different type of heat exchanger with different possible designs. In practice, instruction for modification of the existing process (based on the obtained results) will be proposed


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