Ammonia at a flow rate of 10 Kg/s, 10 bar, and a temperature of 24 deg. C is thr

Question

Ammonia at a flow rate of 10 Kg/s, 10 bar, and a temperature of 24 deg. C is throttled to 1 bar. Which the following is the best description of the state of the ammonia at the exit of the throttle?

a) a) Superheated ammonia

b) b) Compressed Ammonia

c) c) Mixed Phase with a quality of 0.19

d) d) Mixed Phase with a quality of 0.81

The following diagram shows hot industrial wastewater that enters a flash chamber following expansion by a valve. In the flash chamber, the saturated vapor is separated from the saturated liquid. The saturated vapor enters the turbine and leaves as a two-phase mixture. All known process variables are provided in the diagram. Assume the following are negligible: heat transfer, changes in kinetic energy, and changes in potential energy. For operation at steady-state, determine the power developed by the turbine.

a) a) 100 hp

b) b) 200 hp

c) c) 300 hp

d) d) 400 hp

a) a) Superheated ammonia

b) b) Compressed Ammonia

c) c) Mixed Phase with a quality of 0.19

d) d) Mixed Phase with a quality of 0.81

Explanation / Answer

it is a mixed phase computation: h1=enthalpy(ammonia,p=10,t=24) x=quality(ammonia,p=1,h=h1) you get quality 0.1936 h1=enthalpy(ammonia,p=4,x=1) h2=enthalpy(ammonia,p=.08,x=.9) w=5*(h1-h2)/746 w=174.3 hp which is app=200

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