Air in a piston–cylinder device undergoes an internally reversible cycle. That is, the air itself undergoes a reversible set of processes, but irreversible processes (e.g., heat transfer through a finite temperature difference) are possible outside of the air in the cylinder. From state 1 at 100°C and 0.75 MPa, the air expands isothermally to 0.15 MPa at state 2. The air then undergoes a constant-pressure process to state 3 from which the air returns to state 1 by an adiabatic process. Determine the thermal efficiency for the cycle and compare your answer to the thermal efficiency of a completely reversible cycle operating between the same maximum and minimum temperatures. Explain the difference.
You can make a casual claim about either some effect of humna action on the environment or some effect of the environment on human actions. identify possible causes for the effect you are studying, and then use factual information from your research to prove the connection between cause and effect
August 3, 2016
10:53 pm
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