An ideal gas initially at 600K at 10 har undergoes a four-step mechanically reversible cycle in a closed system. In step 12, pressure decreases isothermally to 3 bar; in step 23, pressure decreases at constant volume to 2 bar: in step 34, volume decreases at constant pressure; and in step 41, the gas returns adiabatically to its initial state. Take Cp=(7/2)R and Cv = (5/2)R. (a) Sketch the cycle on a PV diagram (b) Determine (where unknown) both T, P and V for states 1,2,3 and 4. (c) Calculate Q, W, AU and AH for each step of the cycle and for overall cycle.
An ideal gas initially at 600K at 10 har undergoes a four-step mechanically reversible cycle in a closed system. In step 12, pressure decreases isothermally to 3 bar; in step 23, pressure decreases at constant volume to 2 bar: in step 34, volume decreases at constant pressure; and in step 41, the gas returns adiabatically to its initial state. Take Cp=(7/2)R and Cv = (5/2)R. (a) Sketch the cycle on a PV diagram (b) Determine (where unknown) both T, P and V for states 1,2,3 and 4. (c) Calculate Q, W, AU and AH for each step of the cycle and for overall cycle.
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Transcribed Image Text:An ideal gas initially at 600K at 10 bar undergoes a four-step mechanically reversible cycle
in a closed system. In step 12, pressure decreases isothermally to 3 bar; in step 23, pressure
decreases at constant volume to 2 bar: in step 34, volume decreases at constant pressure; and
in step 41, the gas returns adiabatically to its initial state. Take Cp-(7/2)R and Cv = (5/2)R.
(a) Sketch the cycle on a PV diagram
(b) Determine (where unknown) both T, P and V for states 1,2,3 and 4.
(c) Calculate Q, W, AU and AH for each step of the cycle and for overall cycle.
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