control signals are different from the previously applied values if not block 620 is entered directly and the next interrupt is awaited if there has been a change the new control signals are applied to pneumatic control system 600 via the lines 500a block 615 and the block 620 is then entered to await the next interrupt referring to fig4 there is shown a diagram of another embodiment of the invention in a turbine power generation system but wherein the ultrasonic fogging unit labelled 200 39 is located at the output end of the compressor 110 in this embodiment wherein elements having like reference numerals correspond to their counterparts in the fig1 diagram the turbine 120 and the compressor 110 are coupled together via gearing 410 that is driven by the turbine 120 a portion of the gearing 410 is used to drive generator 150 in this embodiment the compressor 110 receives ambient air the process of compressing this air causing a rise in its temperature to for example 700 degrees f the temperatures given here and elsewhere are exemplary only and it will be understood that they will vary from system to system and with different operating conditions the compressed and heated air from compressor 110 is passed through fogging chamber 200 39 which includes fogging devices 250 as previously described the humidifying of the air cools.