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Consider an ideal heat pump that has a condenser temperature of 50°C and an evaporator temperature of 0°C, determine the coefficient of performance
Consider an ideal gas refrigeration cycle using helium as the working fluid. Helium enters the compressor at 100 kPa and -10°C and compressed to 250 kPa.
Consider an ideal Brayton cycle executed between the pressure limits of 1200 and 100 kPa and temperature limits of 20 and 1000°C with argon as the working fluid
Consider an infinitesimal reversible adiabatic compression or expansion process. By taking s = s(P, v) and using the Maxwell relations
Consider an ideal steam reheat cycle in which the steam enters the high-pressure turbine at 600 lbf/in 2, 700 F, and then expands to 120 lbf/in.2.
Consider an ideal steam regenerative cycle in which steam enters the turbine at 3.5 MPa, 400°C, and exhausts to the condenser at 10 kPa
Consider an ideal refrigeration cycle that has a condenser temperature of 45°C and an evaporator temperature of -15°C;
Consider a two-stage cascade refrigeration system operating between the pressure limits of 1.2 MPa and 200 kPa with refrigerant-134a as the working fluid
Consider subsonic flow in a converging nozzle with fixed inlet conditions. What is the effect of dropping the back pressure to the critical pressure on?
Consider an ideal air-standard cycle for a gas-turbine, jet propulsion unit, such as that. The pressure and temperature entering the compressor are 90 kPa
Consider one cylinder of a spark-ignition, internal-combustion engine. Before the compression stroke, the cylinder is filled with a mixture of air and methane
Consider the springtime melting of ice in the mountains, which gives cold water running in a river at 2°C while the air temperature is 20°C
Consider a steam power plant that operates on the regenerative Rankine cycle with one open feedwater heater
Consider a tank that contains a saturated liquid-vapor mixture of water in equilibrium. Some vapor is now allowed to escape the tank at constant temperature
Consider a tank that contains moist air at 3 atm and whose walls are permeable to water vapor. The surrounding air at 1 atm pressure also contains some moisture
Consider a two-part process with an expansion from 0.1 to 0.2 m3 at a constant pressure of 150 kPa followed by an expansion from 0.2 to 0.4 m3
Consider a TV set that consumes 120 W of electric power when it is on and is kept on for an average of 6 hours per day
Consider a three-stage isentropic compressor with two intercoolers that cool the gas to the initial temperature between the stages.
Consider an 18-m-diameter hot-air balloon that, together with its cage, has a mass of 120 kg when empty.
Consider a water pump that receives liquid water at 15oC, 100 kPa and delivers it to a same diameter short pipe having a nozzle with exit diameter of 1 cm
Consider a two-stage cascade refrigeration cycle and a two-stage compression refrigeration cycle with a flash chamber
Consider a two-phase mixture of ammonia and water in equilibrium. Can this mixture exist in two phases at the same temperature but at a different pressure
Consider a piston cylinder with 0.5 kg of R-134a as saturated vapor at -10°C. It is now compressed to a pressure of 500 kPa in a polytropic
Consider a river flowing toward a lake at an average velocity of 3 m/s at a rate of 500 m3/s at a location 90 m above the lake surface
Consider an electric motor with a shaft power output of 20 kW and an efficiency of 88 percent. Determine the rate at which the motor dissipates heat to the room