Abstract
The heat exchanger efficiency is defined as the ratio of the actual heat transfer in a heat exchanger to the optimum heat transfer rate. The optimum heat transfer rate, qopt, is given by the product of UA and the Arithmetic Mean Temperature Difference, which is the difference between the average temperatures of hot and cold fluids. The actual rate of heat transfer in a heat exchanger is always less than this optimum value, which takes place in an ideal balanced counter flow heat exchanger. It has been shown that for parallel flow, counter flow, and shell and tube heat exchanger the efficiency is only a function of a single nondimensional parameter called Fin Analogy Number. The function defining the efficiency of these heat exchangers is identical to that of a constant area fin with an insulated tip. This paper presents exact expressions for the efficiencies of the different cross flow heat exchangers. It is shown that by generalizing the definition of Fa, very accurate results can be obtained by using the same algebraic expression, or a single algebraic expression can be used to assess the performance of a variety of commonly used heat exchangers.
Reference6 articles.
1. Fakheri, A, “Arithmetic Mean Temperature Difference and the Concept of Heat Exchanger Efficiency”, HT2003–47360 Proceedings of the 2003 ASME Summer Heat Transfer Conference, July 21-23, 2003, Las Vegas, Nevada
2. Fakheri, A, “The Shell and Tube Heat Exchanger Efficiency and its relation to Effectiveness,” Proceedings of the 2003 American Society of Mechanical Engineers (ASME) International Mechanical Engineering Congress and Exposition (IMECE) Washington, D.C., USA, November 16-21, 2003
3. Fakheri, A, “An alternative approach for determining the correction factor and the number of shells in Shell and Tube Heat Exchangers,” Journal of Enhanced Heat Transfer, Issue no. 4, 2003, forthcoming.
4. Kays, W.M., and A. L. London, Compact heat Exchangers, 3rd Ed. Krieger Publishing Company, (1984)
5. Mills, A. F, Heat and Mass Transfer. Prentice Hall (1995)
Cited by
8 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献