Helium is used as the working fluid in a Brayton cycle with regeneration. The pressure ratio of the cycle is 8, the compressor inlet temperature is 300 K, and the turbine inlet temperature is 1800 K. The effectiveness of the regenerator is 75 percent. Determine the thermal efficiency and the required mass flow rate of helium for a net power output of 60 MW, assuming both the compressor and the turbine have an isentropic efficiency of (a) 100 percent and (b) 80 percent. The properties of Helium are cp = 5.1926 kJ/kg. K and k = 1.667.

Explanation:

Find the temperature at exit of compressor

Find the work done by the compressor

Find the actual workdone by the compressor

Find the temperature at exit of the turbine

Find the actual workdone by the turbine

Find the temperature of the regeneration

Find the heat supplied

Find the thermal efficiency

60.4%

Find the mass flow rate

Find the actual workdone by the compressor

Find the actual workdone by the turbine

Find the temperature of the compressor exit

Find the temperature at the turbine exit

Find the temperature of regeneration

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answer:

look in settings

explanation: