Abstract
This article deals with numerical fluid flow and heat transfer simulations of a shell and tube heat exchanger in which cooling water is heated by hot exhaust fumes. This heat exchanger plays a major role in a cogeneration unit, since it is responsible for the effective use of residual heat. The objective of the simulations is to evaluate the effects of various design changes made to the heat exchanger and their influence on the temperature fields and thus on the overall performance and efficiency of the system. In our analysis we looked at the baffles which cause the cross-current flow of water outside the tubes and at the placement of the gas inlet, i.e., on the distribution of the mass flow rate of the exhaust fumes inside these tubes.
Highlights
Cogeneration of electricity and heat is a very attractive way of using primary sources of energy as it allows for highly efficient conversion
We investigate a shell and tube heat exchanger, in which hot exhaust fumes are heating up cooling water flowing in a secondary circuit
It can be seen that in the basic configuration, there is a rather significant region behind the baffles where the flow of water is slowed down and a vortex region is established. This effect is undesirable for heat transfer since water accumulates here which heats up and the temperature difference decreases in these regions
Summary
Cogeneration of electricity and heat is a very attractive way of using primary sources of energy as it allows for highly efficient conversion. The bottleneck of this approach is obviously that at the place of its production, there must be demand for the heat energy, either for heating purposes or for industrial use. Over the last decade this principle is being used in much smaller units, cogeneration units Their advantage is that they can be placed directly in industrial facilities, residential buildings, and many other places where both electricity and heat are needed. This greatly increases the opportunities for implementing cogeneration
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