Method for cooling exhaust gases from energy units

A combined cycle energy unit (CCEU), comprising:

• a gas turbine energy unit including an outlet for flue gases and further comprising:
• a regulating nozzle for injecting water into the flue gases from the outlet of the gas turbine energy unit;
• a condenser apparatus for extracting water solely from flue gases from the outlet of the gas turbine energy unit;
• a pump for pumping water directly from the condenser apparatus to the regulating nozzle, wherein the regulating nozzle injects water supplied solely from the condenser apparatus, and where in the water provided to the regulating nozzle is devoid of any chemical treatment;
• and
• a processor communicatively coupled to the regulating nozzle, wherein the processor is configured for:
• receiving sensor data comprising a current temperature of the flue gases and a current water content of the flue gases;
• calculating, based on the sensor data, the following metadata:
• target water content of the flue gases at 100% humidity of the flue gases, and a dew point of the flue gases at said water content;
• calculating, based on the sensor data and the metadata, an amount of water to inject into the flue gases wherein said amount of water is configured for:
• 1) increasing a water content of the flue gases to the target water content, so as to reach 100% humidity of the flue gases;
• 2) lowering a temperature of the flue gases to below the dew point of the flue gases and 3) such that all of said amount of water is absorbed by the flue gases;
• and
• transmitting control signals to the regulating nozzle, and wherein the control signals are configured to command the regulating nozzle to inject said amount of water into the flue gases.