Question

Your new engine design consists of a piston cylinder arrangement. The engine operates with mostly air...

Your new engine design consists of a piston cylinder arrangement. The engine operates with mostly air and a small amount of fuel. The system undergoes a cycle. The initial Pressure and temperature are p1= 1bar and T1= 27°C. The system undergoes a power cycle consisting of the following process:

Process 1-2                         constant volume to a pressure, P2 of 4 bars

Process 2-3                         expansion of pv=constant

Process 3-1                         constant-pressure compression

Draw the system and pv diagrams

If P2 is 4 bars, find T2. List assumptions

Using “cold” cp or cv data, find the heat added in kJ/kg during the constant volume process.

Use the ideal gas air table to find Δu for the constant volume process

Find the specific work for the expansion process

What process name is associated with the expansion process?

What is the total change in specific internal energy for the cycle?

Calculate the net specific work for the cycle

Calculate the thermal efficiency for the cycle

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