Аннотация:Empirical formulas are proposed from experiments on free convective heat transfer from a cylinder array arranged in a vertical line. Subsequently, experiments were carried out to examine the effect of two parallel plates enclosing the array as a heat transfer promoter. Finally, through a discussion of the heat transfer from the entire cylinder systems, both in open and in restricted spaces, a recommendation is made for designing a heat exchanger of a single-line type of cylinder bank.