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Thermal Performance of Multipass Parallel and Counter-Cross-Flow Heat Exchangers

2006; ASM International; Volume: 129; Issue: 3 Linguagem: Inglês

10.1115/1.2430719

1528-8943

Luben Cabezas‐Gómez, Hélio Aparecido Navarro, José Maria Saíz-Jabardo,

Refrigeration and Air Conditioning Technologies

A thorough study of the thermal performance of multipass parallel cross-flow and counter-cross-flow heat exchangers has been carried out by applying a new numerical procedure. According to this procedure, the heat exchanger is discretized into small elements following the tube-side fluid circuits. Each element is itself a one-pass mixed-unmixed cross-flow heat exchanger. Simulated results have been validated through comparisons to results from analytical solutions for one- to four-pass, parallel cross-flow and counter-cross-flow arrangements. Very accurate results have been obtained over wide ranges of NTU (number of transfer units) and C* (heat capacity rate ratio) values. New effectiveness data for the aforementioned configurations and a higher number of tube passes is presented along with data for a complex flow configuration proposed elsewhere. The proposed procedure constitutes a useful research tool both for theoretical and experimental studies of cross-flow heat exchangers thermal performance.