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The microchannel heat exchanger is developed with the Printed Circuit Heat Exchanger (PCHE) fabrication technology. The PCHE is a compact heat exchanger constructed by chemical etching method and diffusion bonding. The PCHE is possible to construct a heat exchanger with a flow channel diameter that is much smaller than that of a commercial plate heat exchanger. The PCHE has an advantage of compactness, therefore it can be utilized as heat exchanger for compact process system such as Liquefied Natural Gas ?Floating Production, Storage and Offloading system, and micro-gas turbine system. However, PCHE also has a disadvantage in performance due to flow maldistribution. The effect of flow mal-distribution has been analyzed with a simple heat exchanger model. The methods to suppress the flow mal-distribution are proposed in this paper.