Non-typical designs of Polypropylene Capillary Heat Exchangers

Abstract— The present article describes a heat exchanger with transparent (smooth) fibres with an atypical body shape and an atypical arrangement of polypropylene capillaries inside. The exchanger cross-section was of a square shape. This type of exchanger was subjected to the investigation of the impact of the fibre arrangement on the overall heat transfer coefficient and behaviour of fibres during the experiment. The exchanger was examined in the counter flow arrangement. The exchanger with 1,400 transparent fibres with the outer diameter of 0.275 mm was examined at the secondary fluid flow rate of 150 l·h-1 to identify the overall heat transfer coefficient k which amounted to 520 W·m-2·K-1. When compared to an exchanger with identical parameters of fibres placed inside a cylindrical exchanger body, a decrease in the overall heat transfer coefficient represented 14%. At the flow rate of 200 l·h-1, the value of the overall heat transfer coefficient identified experimentally was 632 W∙m-2·K-1. When compared to cylindrical exchanger with comparable fibre parameters, the value was 33% lower.

Keywords— Heat exchangers, polypropylene fibres, typical designs Polypropylene Capillary.

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Engineering Journal: Non-typical designs of Polypropylene Capillary Heat Exchangers

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