Chapter 7, Problem 7.112P

Soru 2 16 puan Air enters a compressor at T1=300 K and P1=100 kPa, then compressed to 1500 kPa. The isentropic efficiency of the compressor is 85% and heat transfer to the surrounding during the process is negligible. Find the reversible work in kJ/kg. (Assume constant specific heats at room temperature, c,=1.005 kJ/kg.K, c=0.718 kJ/kg.K, R= 0.287 kJ/kg.K, k=1.4, To=300 K, Po=100 kPa)

A turbine, operating under steady- flow conditions, reccives 1000 kg/min of stcam. At the inlet, the pressure is 30 bar, the temperature is 400°C, the velocity At the exit, the pressure is 0.7 bar, the quality is (100%), and the velocity is 100 m/s. If the turbine produced a power output of 9300 KW. By using the energy balance of open system with sutable tables, answer the following: (a) What are the main assumptions ? (b) Calculate dh, AKe ? (c) Calculate the rate of heat transfer between the turbine and surroundings, in kW.

6. A Carnot engine is operating between 780 K and 310 K produces 60 KJ of work.6.1 Determine the efficiency (e)6.2 Calculate heat absorbed6.3 Determine the change in entropy during heat rejection

An axial flow compressor was tested and found that it gave a pressure ratio of 3 atmosphere and temperature rise of 125° C. A 2000 kw motor was used to drive the compressor. Determine comprissor efficiency and mass flow of air delivered; if the mechanical efficiency is 95% and pressure and temperature at inlet were 1 atm and 300° K.

Thermodynamics need a cancellation of units

Q10) One kg of an ideal gas is compressed isothermally at 400K from 100 kPa to 1000kPa in a piston cylinder arrange, calculate the entropy change of the gas, the entropy change of the surroundings and the total change in entropy if, a- the process is mechanically reversible b- the process is reversible and the surroundings consist of heat sink at 300K ,c- the process is mechanically irreversible requiring 20% more work than the mechanically reversible compression and the surroundings consist of heat sink reservoir at 300K. Take R=0.287.

Hydrogen enters turbine of an ericsson cycle at 1500 K and 900 kPa, with a mass flow rate of 1 kg/s. the temperature and pressurs at the inlet to the compressor are 320K and 1500 kPa, respectively. Determine the following: (a) efficiency, (b) Wnet per mass of air. Show the PV and TS diagram. Please show the formulas and solutions

1. Air enters an adiabatic diffuser at 80kPa and 127°C, at a constant flow of 6000kg/h, and leaves at 100kPa. The air speed drops from 230m/s to 30m/s as it passes through the diffuser. Calculate a) the outlet air temperature and b) the outlet area of ​​the diffuser

A gas initially at 2000 L/kg is compressed polytropically in an Engine. During the process, the final temperature is 1.3 times initial temperature and the final pressure is 6 times the initial pressure. The compression ratio is,  a 4.62                       b 4.82                         c 4.12                     d 4.22    A gas initially at 850 mm Hg is compressed polytropically in an Engine. During the process, the final temperature is 1.5 times initial temperature and the final volume is one-third of initial volume. The final pressure is,  a 5.03                       b 6.03                         c 4.03                     d 7.03   0.45 kg gas is compressed polytropically in an Engine from 2 kg/cm2, 1 m3/kg to 5 kg/cm2 0.5 m3/kg. The nonflow work of compression is,