the disclosure provides a system including a rankine power cycle cooling subsystem providing emissions - critical charge cooling of an input charge flow . the system includes a boiler fluidly coupled to the input charge flow , an energy conversion device fluidly coupled to the boiler , a condenser fluidly coupled to the energy conversion device , a pump fluidly coupled to the condenser and the boiler , an adjuster that adjusts at least one parameter of the rankine power cycle subsystem to change a temperature of the input charge exiting the boiler , and a sensor adapted to sense a temperature characteristic of the vaporized input charge . the system includes a controller that can determine a target temperature of the input charge sufficient to meet or exceed predetermined target emissions and cause the adjuster to adjust at least one parameter of the rankine power cycle to achieve the predetermined target emissions .