Question

Ammonia is brought from saturated vapor at 300 kPa to 1400 kPa, 140^oC in a steady flow adiabatic compressor. Thermodynamic properties of ammonia at initial and final states are given as :

h₁= h_i = 1431.7 kJ/kg, s₁ = s­_i = 5.4565 kJ/kg-K

h₂= h_e = 1752.8 kJ/kg, s₂= s_e = 5.7023 kJ/kg-K         

h_2,s = h_e,s = 1656.08 kJ/kg

a) Find the actual specific work input to the compressor.

b) Calculate the specific work input to the compressor for isentropic compression

c) Determine the isentropic efficiency of the compressor.

d) Estimate the specific entropy generation during the compression process.

Answer 1

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