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A fogging system is being considered for the Brayton power cycle at a power plant.
A fogging system is being considered for the Brayton power cycle at a power plant. The fogging system adds liquid water droplets at the inlet to the compressor which cool the inlet air through evaporation (it is an evaporative cooling system). On a day where the inlet air is 42◦C with a relative humidity of 40% (φ = 0.4) what is the lowest temperature that can be achieved with evaporative cooling?
Given that the turbine is using a simple Brayton power cycle, the volumetric flow rate is limited to 125m3/s, the turbine inlet temperature is always limited to 1800K, and the compressor pressure ratio is 16 what is the % gain in power that can be achieved by this fogging system when it cools the air to the lowest temperature possible? Remember to account for the changes in the working fluid properties (density and spec heats) due to the increased humidity.
What is the gain in thermal efficiency, in %, for the cycle?
How much water does this cycle consume (kg/s)?
