thermodynamica help If an ideal Otto cycle has a compression ratio of 8.9 and pr
ID: 1858668 • Letter: T
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thermodynamica help
If an ideal Otto cycle has a compression ratio of 8.9 and produces 1900 kJ/kg during the expansion, calculate the MEP. Assume that the intake conditions are 27 degree C and 200 kPa. (15) A gas turbine power plant operates on a simple Brayton cycle with air as the working fluid. The air enters the turbine at 1 MPa and 1000 K. and leaves at 125 kPa and 610 K. The compressor exit air temperature is 540 K. Heat is rejected to the surroundings at a rate of 8000 kW and the air flow rate is 25 kg/s. It is given that the compressor efficiency of 80%. Determine (a) the net power output and (b) the thermal efficiency. If a heat pump has a coefficient of performance of 3.5 and requires a net work input of 5000 kJ/cycle, what are the heat transfers (Qin and Q out) per cycle. Also, what would the coefficient of performance be if this device were being used as a refrigerator?Explanation / Answer
cop=3.5 work output=5000kj cop=desired effect/Wnet in heat pump desired effect is heat rejection to the space to be heated Qout=cop*Wnet=3.5*5000=17500kj Qtaken from space=Qout-work output 17500-5000=12500 (cop)ref.=(COP)pump-1=3.5-1=2.5
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