Heat exchangers with boiling in coils are widely used in the industry. Various researchers have recommended different correlations for heat transfer but there has been no comprehensive comparison of data and correlations to identify the most reliable ones. This was done in the present study. Eight correlations for straight tubes and six for coils were compared with data from 12 studies. The data included four fluids, tube diameters 2.8–14.5 mm, coil to tube diameter ratios 12–107, reduced pressure 0.0046–0.7857, flow rates 80–1200 kg m−2 s−1, and boiling number 0.16–13.6 × 104. None of the correlations for coils were found satisfactory. Four general correlations for straight tubes gave good agreement with the 484 data points, mean absolute deviation (MAD) being 19.8–22.6%.

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