Abstract
Surface treatment significantly influences the performance of heat exchangers under condensation or sublimation conditions. This study experimentally investigated the thermal-hydraulic performance of the louver-fin flat-tube heat exchanger with super-amphiphobic treatment, under clean and fouled conditions, subject to the air-side Reynolds number of 40–390 and the relative humidity of 30–80 %. The results show that the coating can enhance total heat transfer by 16.5 % under fouled conditions and by 3.1 % under clean conditions, and slightly rise pressure drop under both conditions in general. Compared to the uncoated one, the super-amphiphobic heat exchanger has a better comprehensive thermal-hydraulic performance (j/f 1/3) by 25.3 % under fouled conditions, while it has an almost identical j/f 1/3 (0.3 % higher) under clean conditions. Moreover, the heat transfer and pressure drop correlations are developed. This research would provide a feasible approach to heat exchanger improvement under unfavorable circumstances.
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