PLASTIC HEAT EXCHANGER USING TWISTED HOLLOW FIBERS

Abstract eng:
Metallic heat exchangers have a number of well-known disadvantages, such as heavy weight and cost and low resistance to corrosion. Polymeric hollow fiber heat exchangers were proposed about a decade ago as an alternative for low temperature applications. A large-scale heat exchanger was prepared using hollow fibers with a special, “curly” shape. The heat exchanger's thermal performance was studied using hot (40-90°C) ethyleneglycol-water brine flowing inside of the fibers and cool air (20-30°C) flowing across the fibers. Experiments showed that the heat exchanger can achieve a significant heat transfer rate and have high values of overall heat-transfer coefficients (60-230 Wm-2K-1). Moreover, obtained results showed that the classical theory is not suitable to estimate outer convection and that special approach should be used.

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