A new simplified formula for crossflow heat exchanger effectiveness
- Combustion Engineering, Inc., Wellsville, NY (United States)
The main objective of this study is to present a new and convenient formula for the effectiveness of a single-pass crossflow heat exchanger with both fluids unmixed. Recently, a survey of various solutions for the effectiveness of a crossflow heat exchanger with two unmixed fluids was given in a letter by Baclic and Heggs (1985). Based on this survey, the formula presented herein has not been obtained by any of the previous authors. The governing equations for the crossflow heat exchanger with two fluids unmixed can be found in the heat transfer text by Jakob (1957) and a heat exchanger text by Hausen (1983). The solution for this configuration was first obtained by Nusselt (1911, 1930). An explanation for the fact that different solutions were obtained by different authors from the same governing equations (as shown in the letter by Baclic and Heggs, 1985) is discussed by Li (in review). This new formula is also much simpler, with regard to computer programming, than the simple formula given by Baclic (1978). Also, the formula given by Baclic was actually derived by Binnie and Poole (1937) fifty years ago. If the most fundamental recurrence formula of modified Bessel functions is substituted into the effectiveness formula obtained by Binnie and Poole, the new formula given by Baclic can be obtained immediately. From the Binnie and Poole formula, one has to compute the first kind of modified Bessel functions for the order from 0 to {infinity}, which will also be discussed in this paper.
- OSTI ID:
- 5899331
- Journal Information:
- Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States), Journal Name: Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States) Vol. 109:2; ISSN 0022-1481; ISSN JHTRA
- Country of Publication:
- United States
- Language:
- English
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