Consider a regenerative Brayton cycle operating with a pressure ratio of 8, where the air enters the compressor at 300 K and 100 kPa, while it enters the turbine at 1060 K. Assume that both the compressor and turbine are isentropic, that specific heats vary with temperature, and that the regenerator has an effectiveness of 74%. Round all intermediate calculations to three decimal places. 1. What is the enthalpy at the turbine outlet in kJ/kg? Round your answer to two decimal places. 2. What is the enthalpy at the entrance to the heat exchanger that accepts external heat kJ/kg? Round your answer to two decimal places. 3. How much external heat is supplied to the cycle in kJ/kg? Round your answer to two decimal places. 4. What is the enthalpy at the entrance to the heat exchanger that rejects heat to the surrounding in kJ/kg? Round your answer to two decimal places. 5. How much heat is rejected to the surroundings in kJ/kg? Round your answer to two decimal places.
Consider a regenerative Brayton cycle operating with a pressure ratio of 8, where the air enters the compressor at 300 K and 100 kPa, while it enters the turbine at 1060 K. Assume that both the compressor and turbine are isentropic, that specific heats vary with temperature, and that the regenerator has an effectiveness of 74%. Round all intermediate calculations to three decimal places.
1. What is the enthalpy at the turbine outlet in kJ/kg? Round your answer to two decimal places.
2. What is the enthalpy at the entrance to the heat exchanger that accepts external heat kJ/kg? Round your answer to two decimal places.
3. How much external heat is supplied to the cycle in kJ/kg? Round your answer to two decimal places.
4. What is the enthalpy at the entrance to the heat exchanger that rejects heat to the surrounding in kJ/kg? Round your answer to two decimal places.
5. How much heat is rejected to the surroundings in kJ/kg? Round your answer to two decimal places.
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