A method for direct cooling of a unit operation under a fixed heat load to a lower temperature wherein the unit operation is cooled with a cooling stream routed from a non-mechanical pump where the cooling stream is a combination of a vaporized motive fluid stream and at least a portion of an effluent gas stream from the unit operation, wherein the direct cooling method comprises: a. circulating a portion of the unit operation effluent having a temperature in the range of approximately 10 to 260 °C (50 - 500°F) with the non-mechanical pump where the vaporized motive fluid stream is provided as a motive force; b. providing the vaporized motive fluid stream to the non-mechanical pump at a temperature in the range of -269 °C to 10 °C (-452°F to 50°F); c. combining the unit operation effluent and the vaporized motive fluid in said non-mechanical pump, wherein the combined stream has a temperature in the range of -46 °C to 149 °C (-50°F to 300°F); d. adjusting a recycle ratio of the mass flow rates of the unit operation effluent stream to the vaporized motive fluid stream combined in the non-mechanical pump wherein the recycle ratio is determined by: Recycle Ratio mass = C Mot ∗ T C − T Mot C Eff ∗ T Eff − T C where, Recycle Ratio mass is the ratio of the mass flow rate of the effluent to the mass flow rate of the vaporized motive fluid stream; C Mot is the specific heat of the vaporized motive fluid stream; C Eff is the specific heat of the unit operation effluent stream entering the non-mechanical pump; T C is the temperature of the combined fluid or the target temperature of the gas stream exiting the non-mechanical pump; T Mot is the temperature of the vaporized motive fluid stream, and is selected by the operator; T Eff is the temperature of the unit operation effluent stream entering the non-mechanical pump. a. circulating a portion of the unit operation effluent having a temperature in the range of approximately 10 to 260 °C (50 - 500°F) with the non-mechanical pump where the vaporized motive fluid stream is provided as a motive force; b. providing the vaporized motive fluid stream to the non-mechanical pump at a temperature in the range of -269 °C to 10 °C (-452°F to 50°F); c. combining the unit operation effluent and the vaporized motive fluid in said non-mechanical pump, wherein the combined stream has a temperature in the range of -46 °C to 149 °C (-50°F to 300°F); d. adjusting a recycle ratio of the mass flow rates of the unit operation effluent stream to the vaporized motive fluid stream combined in the non-mechanical pump wherein the recycle ratio is determined by: Recycle Ratio mass = C Mot ∗ T C − T Mot C Eff ∗ T Eff − T C where, Recycle Ratio mass is the ratio of the mass flow rate of the effluent to the mass flow rate of the vaporized motive fluid stream; C Mot is the specific heat of the vaporized motive fluid stream; C Eff is the specific heat of the unit operation effluent stream entering the non-mechanical pump; T C is the temperature of the combined fluid or the target temperature of the gas stream exiting the non-mechanical pump; T Mot is the temperature of the vaporized motive fluid stream, and is selected by the operator; T Eff is the temperature of the unit operation effluent stream entering the non-mechanical pump. Recycle Ratio mass is the ratio of the mass flow rate of the effluent to the mass flow rate of the vaporized motive fluid stream; C Mot is the specific heat of the vaporized motive fluid stream; C Eff is the specific heat of the unit operation effluent stream entering the non-mechanical pump; T C is the temperature of the combined fluid or the target temperature of the gas stream exiting the non-mechanical pump; T Mot is the temperature of the vaporized motive fluid stream, and is selected by the operator; T Eff is the temperature of the unit operation effluent stream entering the non-mechanical pump. <EOS>