fig2 9 gallons per minute of motive fluid stream 97 63 463 pounds per hour of saturated water at 70 psia and 302 91 u00b0 f are pumped to 155 psia at 68 4 mechanical efficiency at one btu per pound per u00b0 f specific heat of liquid water u03b4t 0 40 u00b0 f making compressibility corrections as taken from keenan and keyes for subcooled liquid at 155 psia 303 32 u00b0 f we arrive at stream 104 of fig2 the key transition in this step was the increase in enthalpy to a known pressure from which all other properties were derived this stream 104 now enters the motive fluid inlet of the jet eductor which is a well rounded entrance curve flow nozzle designed to exhibit maximum thermal efficiency authorities such as heat exchange institute standards for steam jet ejectors third edition heat exchange institute new york 1956 and spink l k principles and practice of flow meter engineering eighth edition the foxboro company foxboro mass 1958 report 97 thermal efficiencies i e an approach to reversible adiabatic isentropic expansion for such nozzles the losses of 3 will appear as heat thus the hydraulic horsepower expended would be equ1 at 68 4 efficiency for the brake horsepower bhp thus added by the pump 96 we have.