Answer to Question #132889 in Mechanical Engineering for Mohammed

Question

0.5 kg of air is taken through a constant pressure cycle. At the beginning of
adiabatic compression are 96.5 kN/m 2 and 15 0 C. The pressure ratio of
compression is 6. Constant pressure heat addition occurs after adiabatic
compression until the volume is doubled. Take γ = 1.4 and R= 0.289 kJ/kg K.
Determine for the cycle:
(a) The pressure, volume and temperature at cycle state points. (b) The heat received.
(c) The thermal efficiency. (d) The work ratio.
(e) The heat rejected.

Answer 1

mass of air =0.5 kg, P₁₌96.5 kN/m²,T₁= 15 ⁰C,compression ratio=6, Heat addition takes place at constant pressure to volume become doubled.

(a)

,

for finding v1 we use ideal gas equation

(b)

(c) Thermal efficiency

(d)

Work ratio=

Work ratio= 0.01

for heat rejected

it is heat rejected