Putting The Second Law to Work


The direct application of the Second Law to design has been very elusive. The potential that it could provide the key to some very elegant approach to design was always sensed hut was not fully realised until comparatively recently. This elusive and powerful approach was identified as the optimisation of the design of thermal systems through minimising the rate of entropy generation, i.e. exergy loss. Methods of identifying and formulating the rate of entropy generation in terms of common design parameters such as heat exchanger tube diameter or solar collector operating temperature were developed leading to a rational economics basis for the optimisaition of a thermal system or piece of equipment. The approach is very powerful. Not only does it allow the optimum design to be identified but by comparing two non-optimum designs it is possible to choose between them the design nearer the optimum being the obvious better choice.


Heat Transfer Entropy Generation Solar Collector Thermal System Thermal Energy Storage 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. 1.
    Bejan, A., “Entropy Generation Through Heat and Fluid Flow”, John Wiley, 1982.Google Scholar
  2. 2.
    Bejan, A., “Second-law Analysis in Heat Transfer and Thermal Design”, Advances in Heat Transfer, Vol. 15, 1982, pp. 1 - 58.CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1985

Authors and Affiliations

  • N. Hay
    • 1
  1. 1.Department of Mechanical EngineeringUniversity of NottinghamEngland

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