The propane is contained in a piston-cylinder assembly, which maintains constant pressure at 0.2 MPa. If a mixture with a quality of 0.65 and a total volume of 0.07 m3 is slowly heated to a temperature of 54°C, a) what was the total work into the system b) what was the total amount of heat added to the system.

Please explain what tables you use to find the answer.

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2. Water at a temperature of 80 °C and velocity of 1.2 m/s is flowing parallel to one side of a smooth flat plate. The plate is maintained at a constant temperature of 24 °C and is 0.8 m long and 0.5 m wide. Determine the following:

1. The heat flux at a distance x = 0.6m from the front edge of the plate, q” = ____________
2. The location of the maximum heat flux on the plate, x = _________
3. The total convective heat transfer from the water to the top surface of the plate,

                                                                                                                   q = __________

4. The convective heat transfer between the water and the plate from x = 0.6 m to x = 0.8m

                                                                                                                   q₂ = __________

for water: ρ = 987 kg/m³, µ = 528 x 10^-6 N·s/m², k = 645 x 10^-3 W/m·K, Pr = 3.42

An uninsulated steam pipe with a wall temperature of 140 °C passes through a room of quiescent air of 14 °C. The pipe is horizontal and has an outer diameter of 20 cm. Find the following (include units if needed):

a) The temperature to evaluate properties = __________

b) The Rayleigh number, _____________

c) The heat transfer coefficient, h = ____________

d) q’ along the pipe = ________________

e) The pipe diameter is decreased by 50%. If all other parameters remain the same, will the heat transfer coefficient increase, decrease or stay the same? ___________. Justify your answer mathematically. For air: ν = 20.92 x 10-6 m2/s, α = 29.9 x 10-6 m2/s, 30 x 10-3 W/m·K, Pr = 0.7

1. Rank in order of total heat input (Note: don’t confuse with heat input RATE) and overall size of heat affected zone: GTAW, SMAW, Oxyfuel, laser beam welding

2. What are the advantages of reducing total heat input in a weld?

In a marine gas turbine unit a high-pressure turbine drives the compressor, and a low-pressure turbine drives the propeller through suitable gearing. The overall pressure ratio is 4/1, and the maximum temperature is 650⁰C. The isentropic efficiencies of the compressor, High Pressure turbine, and Low Pressure turbine are 0.8, 0.83 and 0.85 respectively, and the mechanical efficiency of both shafts is 98%.

Calculate the pressure entering the Low Pressure turbine when the air intake conditions are 1.01 bar and 25⁰C. Calculate also the thermal efficiency and the shaft power when the mass air flow is 60 kg/s. Neglect kinetic energy changes, and the pressure loss in combustion.

For all compression processes take c_p = 1.005 kJ/kg K and ɣ=1.4; for the combustion and expansion processes take c_p = 1.15 kJ/kg K and ɣ=1.333. Neglect the mass of fuel.

A 750-g collar can slide along the horizontal rod shown. It is attached to an elastic cord with an undeformed length of 300 mm and a spring constant of 250 N/m. Knowing that the collar is released from rest at A and neglecting friction, determine the speed of the collar at B and at E. (Round the final answer to two decimal places.)

LESSON: Heat transfer

Explain what the characteristic dimension of x,L,D is for different geometries in calculation of dimensionless numbers (Nu,Re,Gr) in forced and natural Transport.

A gas turbine unit has a pressure ratio of 5/1 and a maximum cycle temperature of 550⁰C. The turbine drives the compressor and an electric generator., the mechanical efficiency of the drive being 97%. The ambient temperature is 20⁰C and the isentropic efficiencies of the compressor and turbine are 0.8 and 0.83 respectively.

Calculate the power output in kilowatts for an airflow of 15kg/s. Calculate also the thermal efficiency and the work ratio. Neglect changes in kinetic energy, and the loss of pressure in the combustion chamber.

Take c_p = 1.005 kJ/kg K and ɣ=1.4 for the compression process, and take c_p = 1.15 kJ/kg K and ɣ=1.333 for all combustion and expansion processes.

air behaves as an ideal gas with R = 0.287 k J k g K.

1. A compressor operates at steady state and takes in air from ambient 0 kPa, gage and 300 K. The outlet pressure is 60 kPa, gage and 300 K. Determine:
   1. the mass flow rate if the inlet area is 10 cm² and the inlet pressure is -3 kPa, gage.
   2. the minimum outlet temperature that is possible for this compressor.
   3. the isentropic efficiency of the compressor, assuming no heat loss.
   4. if there is a heat loss of 20 kJ/kg, the work required to run the compressor, and the new isentropic efficiency.

1. Make a search to introduce the design view point for the subject of brakes and friction clutches.

Determine the quality (if saturated) or temperature (if superheated) of the following: (show details of your answer, not just write the final answer)

a) Water at p=50 kPa, v=1 m3/kg

b) Water at p=1.6 MPa, v=0.15 m3/kg

c) Water at p=7 MPa, h=3160 kJ/kg

d) Refrigerant R-134a at p=200 kPa, v=0.009 m3/kg

e) Refrigerant R-134a at p=0.2 MPa, v=0.12 m3/kg