In this paper, the performance analysis of the Microchannel Delugeable Tube Bundle (MDTB) was conducted in order to establish the understanding of the design and control parameters' effects, such as channel geometry and air-side conditions on fluid flow and heat transfer. The applications for Microchannel Heat Exchangers (MHXs) in energy system, electronic cooling, fuel cell automobiles, etc, have become widely. This is due to their small size, light in weight, less materials, and high heat transfer coefficients. The MDTB consists of the horizontal flat bare tubes with rectangular microchannels/ports on the steam-side. In the heat exchanger industry, the most commonly used microchannels/ ports are rectangular and circular. Furthermore, the rectangular microchannel geometry attained the lowest thermal resistance compared to the triangular and trapezoidal geometries. Therefore, in this paper, the rectangular microchannels were considered. The MDTB performance was predicted by employing the semi-empirical model which was validated using the literatures. The crucial characteristics for accuracy, for semi-empirical model, are heat-transfer and pressure-drop correlations. Therefore, to improve the accuracy of the model, the correlations in the literatures for the steam-side microscale heat transfer and pressure drop inside the microchannel were extensively evaluated and compared. The governing equations were solved analytically and iteratively using Log Mean Temperature Difference (LMTD) method. The employed empirical model was validated against literatures. Both steam-side pressure and heat transfer rate were found to increase as the hydraulic diameter decreased. The Thermal Performance Index (TPI) was found to increase with the hydraulic diameter.