Q1:One kg of air at a temperature of 40°C is compressed isothermally from a pressure of 1.5 bar to 6 bar .Determine the heat rejected by the air during the process of compression .For air C, = 1.005 kJ/ kg .K and C, = 0.712kJ/ kg. K
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- Calculate the density of water vapor at 350 kPa abs and 20 °C if its gas constant (R) is 0.462 kPa m³/kg · K.Q1: One kg of air at a temperature of 40°C is compressed isothermally from a pressure of 1.5 bar to 6 bar Determine the heat rejected by the air during the process of compression .For air Cp = 1.005 kJ/ kg .K and Cy = 0.712kJ/ kg. K %3D6. 5. What is the equivalent pressure in kPa corresponding to one meter of air at 15 °C under standard atmospheric conditions? At sea level a mercury barometer reads 750 mm and at the same time on the top of the mountain another mercury barometer reads 745 mm. If the specific weight is uniform at 12 N/m³, determine the height of the mountain.
- 0.05 kg of steam at 1.5 MPa is contained in a rigid vessel of volume of 0.0076 m^3. A. What is the temperature of the steam? B. If the vessel is cooled, at what temperature will the steam be just dry and saturated? C. Cooling is continued until the pressure in the vessel is 1.1 MPa, calculate the amount of vapor at this point. D. Calculate the amount of heat rejected between the initial and the final state. E. Draw the Ts diagram of the whole process.Q2// Consider a special ball made of steel (p- 5000 kg/m', Cp- 300 J/kg. k, A= 60 m²). The initial temperature of the ball is 300 K. It is immersed in a large oil tank at 400 K. The convective heat transfer coefficient, h at the sphere surface is 3000 W/m³. k. Assume that there is no radial temperature gradient inside the ball. Use Euler's method to find the temperature of the sphere at t = 15 sec after it was immersed in the oil tank. Use a step size of h= 5 sec. The energy balance equation of the ball is given by the following equation: dT pCp -=-hA(T-T₂) dtAt the start of compression in an air standard Otto cycle with a compression ratio of 10, air is at 100 kPa and 313.15 K. A heat addition of 2800 kJ/kg is made. Calculate the thermal efficiency. For air, use k=1.4
- No. 1. (10 Pts) An aluminum pipe with a length of 60 m at a temperature of 10°C rests freely on the ground. An adjacent steel pipe at the same temperature is 5 mm longer than the aluminum pipe. (a) At what temperature (degrees Celsius) will the aluminum pipe be 15 mm longer than the steel pipe? (Assume that the coefficients of thermal expansion of aluminum and steel are aa=23x10-6/"C and as=12x10-6/ c, respectively.) (b) What is the axial stress developed in the aluminum pipe when the temperature was increased? 5 mm Aluminun Steel Figure No. 1Air enters a compressor operating at steady state at 15 lbf/in.², 80°F and exits at 200°F. Stray heat transfer and kinetic and potential energy effects are negligible. Assuming the ideal gas model for the air, determine the maximum theoretical pressure at the exit, in lbf/in.² lbf/in.² P2,max =3. A 30 m steel tape is 2 mm too long at 20°C with a pull of 55 N. A rectangle is measured with this The sides are recorded as 144.95 m and 113.00 m. The average temperature during the measurement is 30°C with a pull of 55 N. Use coefficient of expansion of steel tape as a 0.0000116 m /°C. tape. a) Compute the actual length of tape during measurement. b) What is the true area? c) What is the error in area in sq.m.
- A gas at 45 degrees Celsius is under pressure of 398.675 kPa. Assume gas constant of 287N-m/kg-K. a. Determine the density of the gas b. Calculate the specific weightA closed tank contains 0.5m of mercury, 2m of water and 3m of oil of density 600 kg/m3 and there is an air space above the oil. If the gage pressure at the bottom of the tank is 200 kPa, what is the pressure of the air at the top of the tank? Air Oil Water MercuryAir within a piston-cylinder assembly, initially at 15 lbf/ in.2, 510°R, and a volume of 6 ft³, is compressed isentropically to a final volume of 3 ft³. Assuming the ideal gas model with k = 1.4 for the air, determine the: (a) mass, in lb. (b) final pressure, in lbf/in.² (c) final temperature, in °R. (d) work, in Btu.