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Argon is contained in a 3 m
3
rigid volume at 75 C and 400 kPa. Calculate the heat transfer
needed to increase the pressure to 800 kPa.
Air is compresses in a two-stage vane-type compressor from 1.013 bar to.
8.75 bar Using the data below, and assuming equal pressure ratios in each
stage, that compression is complete in each stage that the machine
operates in an ideal manner and is uncooled apart from the intercooler,
calculate:
(i) the power required.
(ii) The volume flow rate measured at the delivery pressure.
A double pipe heat exchanger has an effectiveness of 0.5 when the flow is
counter- current and the thermal capacity of one fluid is twice that of the
other fluid. Calculate the effectiveness of the heat exchanger if the direction
of flow of one of the fluids is reversed with the same mass flow rates as
before?
A rankine cycle has the following operating conditions, steam pressure, 2.5 MPa, steam temperature, 280°C, Exhaust pressure 0.026 MPa, indicated steam rate, 5.45 kg/kwh, mechanical efficiency, 90%. For ideal cycle and engine, calculate (a) thermal efficiency, (b) The engine steam rate, (c) The actual condition of exhaust steam, and (d) The steam flow rate in kg/h for 1 Mw generator output at 94% efficiency. Ans. (a) 28.6%, 28.5%; (b) 4.69 kg/kwh; (c) 86.33%; (d) 6447 kg/h
i want to know about all dimensions of solar flat plate collector for modeling in cad software.
please help me with it. i want it for capacity of 200 L.
A piston cylinder contains gas initially at 3500 kPa with a volume of 0.03 cubic meter. The gas is compressed during a process where pV raise to 4.25 = C to a pressure og 8500 kPa. The heat transfer from the gas is 2.5 kJ. Determine the change in internal energy, neglecting changes in kinetic and potential energies.
1.) Air expands through a nozzle from 75 to 15 psia. The enthalpy decreases by 48 Btu/lbm. The flow is adiabatic and the inlet velocity is very low. calculate the exit velocity.

2.) The flow rate through a steam nozzle is 450 kg/h. The initial and final pressures are 1400 and 14 kPa, respectively. THe initial and final velocities are 150 and 1200 m/s, respectively. If there is no heat transfer, calculate the change in enthalpy.

3.) Steam expands adiabatically through a nozzle from 1400 to 14 kPa. The initial and final enthalpy values are 3300 and 2800 kJ/kg, respectively, and the initial velocity is very low. Determine the final velocity.
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