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Differences in surface water and deep water temperature can be utilized for power generation. It is proposed to construct a cyclic heat engine that will operate
Determine the total force, in kN, on the bottom of a 100 A 50 m swimming pool. The depth of the pool varies linearly along its length from 1 m to 4m
Determine the power required for a 2000-kg car to climb a 100-m-long uphill road with a slope of 30° (from horizontal) in 10 s
Determine the boundary work done by a gas during an expansion process if the pressure and volume values at various states are measured to be 300 kPa
Describe the ideal process for an (a) Adiabatic turbine
Determine the enthalpy change and the entropy change of nitrogen per unit mole as it undergoes a change of state from 225 K and 6 MPa to 320 K and 12 MPa
Consider two actual power plants operating with solar energy. Energy is supplied to one plant from a solar pond at 80°C and to the other from concentrating
Consider the turbocharger of an internal combustion engine. The exhaust gases enter the turbine at 450°C at a rate of 0.02 kg/s and leave at 400°C.
Consider two identical 50-kg women, Candy and Wendy, who are doing identical things and eating identical food except that Candy eats her baked potato
Consider the ammonia Rankine-cycle power plant shown in, a plant that was designed to operate in a location where the ocean water temperature is 25°C
Consider the process of heating water on top of an electric range. What are the forms of energy involved during this process? What are the energy transformation
Consider an ideal steam regenerative Rankine cycle with two feedwater heaters, one closed and one open
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 regenerative cycle in which steam enters the turbine at 3.5 MPa, 400°C, and exhausts to the condenser at 10 kPa
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 a steam power plant that operates on the regenerative Rankine cycle with one open feedwater heater
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 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