Question

In: Mechanical Engineering

Air is compressed from 100 Kpa and 22 C to an outlet pressure 8 times greater....

Air is compressed from 100 Kpa and 22 C to an outlet pressure 8 times greater. The compressor is not well insulated and loses heat at a rate of 120 kJ/kg. It is also note that there is a decrease in the entropy of the air of 0.4 kJ/kg-K between the inlet & the outlet. Assuming constant specific heats determine a) The outlet air temperature b) The required work input (kJ/kg) c) The entropy generation sgen (kJ/kg-K) during the compression process

Solutions

Expert Solution


Related Solutions

Air enters the compressor at 100 kPa, 300 K and is compressed to 1000 kPa. The...
Air enters the compressor at 100 kPa, 300 K and is compressed to 1000 kPa. The temperature at the inlet to the first turbine stage is 1400 K. The expansion takes place isentropically in two stages, with reheat to 1400 K between the stages at a constant pressure of 300 kPa. A regenerator having an effectiveness of 100% is also incorporated into the cycle. The turbine and the compressor each have am isentropic efficiency of 80%. Determine the following: (a.)...
In an Otto cycle air is compressed from an initial pressure 120 kPa and temperature 370...
In an Otto cycle air is compressed from an initial pressure 120 kPa and temperature 370 T (K). The cycle has compression ratio of 10. In the constant volume heat addition process 1000 kJ/kg heat is added into the air. Considering variation on the specific heat of air with temperature, determine, (a) the pressure and temperature at the end of heat addition process (show the points on P-v diagram) (b) the network output (c) the thermal efficiency (d) the mean...
QUESTION NO 1 In an Otto cycle air is compressed from an initial pressure 120 kPa...
QUESTION NO 1 In an Otto cycle air is compressed from an initial pressure 120 kPa and temperature (T = 380). The cycle has compression ratio of 10. In the constant volume heat, addition process 1000 kJ/kg heat is added into the air. Considering variation on the specific heat of air with temperature, determine, (a) the pressure and temperature at the end of heat addition process (show the points on P-v diagram) (b) the network output (c) the thermal efficiency...
In an Otto cycle air is compressed from an initial pressure 120 kPa and temperature 370...
In an Otto cycle air is compressed from an initial pressure 120 kPa and temperature 370 T (K). The cycle has compression ratio of 10. In the constant volume heat addition process 1000 kJ/kg heat is added into the air. Considering variation on the specific heat of air with temperature, determine, (a) the pressure and temperature at the end of heat addition process (show the points on P-v diagram) (b) the network output (c) the thermal efficiency (d) the mean...
A mass of 0.07 kg of air at a temperature of 30°C and pressure 100 kPa...
A mass of 0.07 kg of air at a temperature of 30°C and pressure 100 kPa is compressed to a pressure of 600 kPa, according to the law: (i.e. Polytropic process, n=1.3). Determine: i.The final volume ii.The final temperature iii.The work transfer iv.The change in internal energy v.The heat transfer
An adiabatic air compressor with inlet conditions of 100 kPa, 27 C and an exit pressure...
An adiabatic air compressor with inlet conditions of 100 kPa, 27 C and an exit pressure of 500 kPa has an inlet volume flow rate of 5 m3/s and operates in steady flow. Calculate the minimum power required to drive the compressor.
Air is at 100 kPa and 150°C, and undergoes a constant pressure process. The final temperature...
Air is at 100 kPa and 150°C, and undergoes a constant pressure process. The final temperature of the air is 1000°C. a) Compute the specific volume ratio. b) Compute the boundary work (kJ/kg) c) Compute the change in specific internal energy by: 1. Using the tables. 2. Integrating the polynomial (cp) 3. Assuming constant specific heat. d) Repeat c for specific enthalpy e) Compute the heat
Air is supplied to a convergent–divergent nozzle from a reservoir where the pressure is 100 kPa....
Air is supplied to a convergent–divergent nozzle from a reservoir where the pressure is 100 kPa. The air is then discharged through a short pipe into another reservoir where the pressure can be varied. The cross-sectional area of the pipe is twice the area of the throat of the nozzle. Friction and heat transfer may be neglected throughout the flow. If the discharge pipe has constant cross-sectional area, determine the range of static pressure in the pipe for which a...
Atmospheric air, at constant conditions, 102 kPa pressure and 30 ° C to a air conditioning...
Atmospheric air, at constant conditions, 102 kPa pressure and 30 ° C to a air conditioning system enters at 60% relative humidity at temperature. The volumetric flow of atmospheric air is 100 L / s. Air, It is separated from the air conditioning system at a pressure of 95 kPa and a temperature of 15 ° C at 100% relative humidity. In this process, the temperature of the condensing water is 15 ° C. This air conditioning Calculate the heat...
Air at a pressure of 350 kPa, a temperature of 80°C, and a velocity of 180...
Air at a pressure of 350 kPa, a temperature of 80°C, and a velocity of 180 m/s enters a convergent–divergent nozzle. A normal shock occurs in the nozzle at a location where the Mach number is 2. If the air mass flow rate through the nozzle is 0.7 kg/s, and if the pressure on the nozzle exit plane is 260 kPa, find the nozzle throat area, the nozzle exit area, the temperatures upstream and downstream of the shock wave, and...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT