EFFECT OF WIRE PITCH ON CAPACITY OF SINGLE STAGGERED WIRE AND TUBE HEAT EXCHANGER USING CFD SIMULATION

Document Type: Original Article

Authors

Department of Mechanical Engineering, Faculty of Engineering, Universitas Negeri Surabaya, East Java, Indonesia

Abstract

Single staggered is a design development of normal wire and tube heat exchanger where wires welded with the staggered configuration on two sides. Capacity of wire and tube heat exchanger is the ability of the heat exchanger in releasing heat. The objective of this study is to analyse the effect of wire pitch (pw) on capacity of single staggered wire and tube heat exchanger. The research method uses Computational Fluid Dynamic (CFD) simulation by ANSYS Fluent to analyse heat transfer at wire and tube and analyse airflow at surface surrounding wire and tube. The simulation is validated experimentally by measuring temperatures at some points of wire and tube. Based on results, temperature contours show increasing capacity of heat exchanger depending on smaller wire pitch, where the highest value is 72.02 Watt at pw 7 mm. The reason is smaller wire pitch increases area of convection heat transfer surface. Whereas, airflow patterns show air at the surface surrounding of wire and tube flowing by free convection. This study contributes new design of wire and tube heat exchanger with CFD and it can be applied to improve the performance of this heat exchanger in refrigeration system and other applications.

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