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Not Available The goal of this Phase I research is to design, fabricate, and test a high-efficiency, low-power, two-phase pumped loop. This high-efficiency, low-power, two-phase pumped loop will use a unique two-phase working fluid pair that offers the capability of higher efficiency and lower pumping power because of its heat of solution characteristic. This heat of solution characteristic, combined with the latent heat of vaporization, significantly increases the cooling capacity of the working fluid, resulting in significantly lower flow rates required for a given cooling load, decreasing the pumping power required. The Phase I effort will analyze various working fluid pairs, select the optimum fluid pair, design and fabricate a two-phase pumped loop test stand, and compare the performance of the two-phase pumped loop operating with the working fluid pair to the performance of the same loop operating with two-phase single-component fluid alone.