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A solid aluminium sphere of emissivityε is initially at an elevated temperature and is cooled by placing it in chamber. The walls of the chamber are maintained at a lower temperature and a c
An axial flow compressor stage has blade root,mean and tip velocities of 150,200 and 250 m/s. The stage is to be designed for a stagnation temperature rise of 20K and axial velocity of 150 m/s, both
In moles of an ideal gas A and (1-n)moles of an ideal gas B, each at 1 atm, are mixed at total constant pressure. what ratio of A to B in the mixture maximizes the decrease in the Gibbs free energy
A large stationary Brayton cycle gas-turbine power plant delivers a power output of 100 MW to an electric generator. The minimum temperature in the cycle is 300 K, and the maximum temperature is 160
A Brayton cycle inlet is at 300 K, 100 kPa and the combustion adds 670 kJ/kg. The maximum temperature is 1200 K due to material considerations. What is the maximum allowed compression ratio?
Steam leaves a power plant steam generator at 3.5 MPa, 400°C, and enters the turbine at 3.4 MPa, 375°C. The isentropic turbine efficiency is 88%, and the turbine exhaust pressure is 10 kPa.
The outlet is discharging water to the atmosphere. Disregarding the frictional effects, determine the force exerted on the bolts due to the water flow?
A small steam power plant has a boiler exit of 3 MPa, 400°C while it maintains 50 kPa in the condenser. All the components are ideal except the turbine which has an isentropic efficiency of 80%
Determine how much mass must be added to or removed from the counterweight to maintain balance when the hole at the bottom is opened.
A steam power plant has a high pressure of 5 MPa and maintains 50°C in the condenser. The boiler exit temperature is 600°C. All the components are ideal except the turbine which has an actua
The refrigerant R-22 is used as the working fluid in a conventional heat pump cycle. Saturated vapor enters the compressor of this unit at 50 F; its exit temperature from the compressor is measured
The system is allowed to come to equilibrium. Determine the final temperature in °C, the entropy change for the copper vessel and each of the liquid water masses, and the amount of entropy produ
Helium gas in an ideal Otto cycle is compressed from 12C and 2L to 0.25L, and its temperature increases by an additional 800C during the heat addition process. Calculate the temperature of the heli
The turbine is adiabatic, and kinetic and potential energy changes are negligible. If the isentropic turbine efficiency is 75%, determine the work per unit mass flow in KJ/kg, and plot on an h-s dia
Determine the exit temperature of the oil, and the entropy generation of the heat exchanger. If instead of making this calculation, you had measured the exit temperature of the oil at 300K
A supply of steam at 100 kPa, 150°C is needed in a hospital for cleaning purposes at a rate of 15 kg/s. A supply of steam at 150 kPa, 250°C is available from a boiler and tap water at 100 kP
A "friend" asks you to construct the phase diagram for a new binary alloy of A and B. The clues are: (i) A and B are completely immiscible in each other and no solid solutions exist in the diagram.
An insulated mixing chamber receives 4 lbm/s R-134a at 150 lbf/in.2, 220 F in a line with low velocity. Another line with R-134a as saturated liquid 130 F flows through a valve to the mixing chamber
Assume that the Mercury 50 operates on an ideal Brayton cycle (no regeneration), and that the working fluid is air with variable specific heat, determine i) the thermal efficiency, ii) power output.
Consider a well 12 inches in diameter. There are 1000 feet of 10x4 inch collars and 9000 feet of 5x4.26 inch drill pipe. The bit has 3 nozzles of diameter 13/32 inch.
A refrigerator removes 1.5 kJ from the cold space using 1 kJ work input. How much energy goes into the kitchen and what is its coefficient of performance?
200 kPa, and that the compression and power stroke efficiencies are 90%. Using the provided engine data, determine the charge mass (grams).
A flow of liquid glycerine flows around an engine, cooling it as it absorbs energy. The glycerine enters the engine at 140 F and receives 13 hp of heat transfer. What is the required mass flow rate
Calculate the mass of the fluid present, the value of n in the first process and the net work done on or by the fluid in the cycle. Sketch the cycle on the p-V diagram.
Two flows of air both at 200 kPa of equal flow rates mix in an insulated mixing chamber. One flow is at 1500 K and the other is at 300 K. Find the irreversibility in the process per kilogram of air