A spring-loaded piston-cylinder device contains 1.5 kg of carbon dioxide. This system is heated from 200 kPa and 25 °C to 1200 kPa and 300°C. Determine the total heat transfer to and work produced by this system.
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- 2-64 Nitrogen enters a steady-flow heat exchanger at 150 kPa, 10°C, and 100 m/s, and it receives heat in the amount of 120 kJ/kg as it flows through it. Nitrogen leaves the heat exchanger at 100 kPa with a velocity of 200 m/s. Determine the Mach number of the nitrogen at the inlet and the exit of the heat exchanger.1) A cylinder of volume 50cm made of Pyrex glass is full to the brim with acetone. Suppose the cylinder and acetone are warmed by 30°C. (Coefficient of linear expansion of glass, 3.2 x 10-6K-1 and acetone, 5.0 x 10-5K-1) i. Calculate the change in volume of the glass. ii. Calculate the change in volume of the acetone. ii. Will any acetone spill out of the cylinder? Explain.a constant pressure container (inside the piston-cylinder) with 250 kPa pressureat the beginning the mass of the saturated water vapor was 8 kg. Then the saturated steam in the cylinder compressed to 3/4 of its mass vy cooling.1) what's the amount of heat transferred to the environment.
- Consider 5.0 pounds per minute of water vapor at 100 lb/in², 500°F, and a velocity of 100 ft/s entering a nozzle operating at steady state and expanding adiabatically to the exit, where the pressure is 40 lb/in². The isentropic nozzle efficiency is 85.0%. Determine the velocity of the steam at the exit, in ft/s, and the rate of entropy production, in Btu/min-°R.Steam enters a turbine at 15bar and 600°C with a rate of 0.371 kg/s. The steam expands to 0.08 bar with quality at 90%. Stray heat transfer and kinetic and potential energy effects are negligible. For operation at steady state, • the volume flowrate at the turbine outlet is m³/s, ⚫the power developed by the turbine is ⚫and the temperature at the turbine exit is kW, °C.problem 5.3 Consider a steam power plant that operates on the ideal reheat Rankine cycle. The plant maintains the boiler at 5000 kPa, the reheat section at 1200 kPa, and the condenser at 20 kPa. The mixture quality at the exit of both turbines is 96 percent. Determine the temperature at the inlet of each turbine and the cycle's thermal efficiency. Answers: 327°C, 481°C, 35.0 percent High-P turbine Low-P turbine Reheater Boiler Condenser 2 Pump
- A 1.5-ft³rigid tank contains saturated refrigerant-134 at 170 psia. Initially, 20 percent of the volume is occupied by liquid and the rest by vapor. A valve at the top of the tank is now opened, and vapor is allowed to escape slowly from the tank. Heat is transferred to the refrigerant such that the pressure inside the tank remains constant. The valve is closed when the last drop of liquid in the tank is vaporized. Determine the total heat transfer for this process. R-134a, Sat. mixture P = 170 psia V = 1.5 ft³An oil of viscosity 5 poise is used for lubrication between a shaft and sleeve. The diameter of the shaft is 0.5 m and it rotates at 200 r.p.m. Calculate the power lost in oil for a sleeve length of 100 mm. The thickness of oil is 1 mm.1. A Rankine cycle with reheating has a throttle pressure of 135 bars at the turbine inlet and 28 bars reheat pressure, the throttle and reheat temperature of the steam is 550C, condenser pressure is 0.035 bar, mass flow rate of steam is 10 kg/sec. Draw the T-s and schematic diagram of the cycle and determine the following: (c) theoretical thermal efficiency (d) the steam rate (e) heat rate of the cycle
- Q4: A. Calculate the pressure of steam at a temperature of 500°C and a density of 24 kg/m³ using (a) the ideal gas equation, (b) the van der Waals equation, (c) the compressibility factor, and (d) the steam table.ENERGY CONSERVATION - BERNOULLI EQUATION. 3. Kerosene flows at 25 ° C, at a rate of 1200 L / min, from the lower tank (A) to the upper tank (B) through a 2 ”copper tube. type K. Calculate the air pressure over the fluid.Problem 2 Refrigerant-134a enters the compressor of a refrigeration system as saturated vapor at 0.16 MPa, and leaves as superheated vapor at 0.9 MPa and 70°C at a rate of 0.08 kg/s. Determine the rates of energy transfers by mass into and out of the compressor. Assume the kinetic and potential energies are negligible.