The specific objectives of the investigation are as follows: Generate experimental comparisons of heat transfer rates and pressure drops for selected refrigerants in a flat plate, single-channel, and micro-scale condenser. Develop correlations of heat transfer and pressure drop coefficients using the experimental data obtained in this study together with the data available in the open literature, and present it in a useful form for designers and for publication in the ASHRAE Handbook of Fundamentals. Use two different refrigerants that are commercially available as the working fluid to conduct experiments. Determine whether there is any deviation in heat transfer and pressure drop trends compared to macro-scale, conventional heat exchangers, and if there is, quantify such deviation accordingly. Units: SI