<![CDATA[Wire and Tube heat exchanger consists of coiled tube and wire sticked on the two sides of it in normal direction of the tube. The ability of this heat exchanger to dissipate heat is shown by the overall surface effi ciency from array of fi ns or called as heat exchanger effi ciency. The wire which functions as a fi n is the expansion of the outer surface of tube, so that it expands the surface of free convection heat transfer and transfers heat from the heat exchanger to the outside surroundings. The fi n effi ciency commonly depends on its material, geometry and environment where it is used. In this research, the infl uence of the wire pitch to the heat exchanger was examinated. Tthree designs of the heat exchanger with different wire pitch namely (pw/Lw = 0.015; pw/Lw = 0.029 dan pw/Lw = 0.044) were tested into fi ve levels of entrance fl uids temperature (40, 50, 60, 70, and 80 0 C). The fi nding of this study was that the heat exchanger pw/Lw = 0.029 evenly produced the highest effi ciency.]]>
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