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A four-stroke gasoline engine runs at 1800 RPM with a total displacement of 3 L and a compression ratio of 10:1. Find the cycle efficiency and power output.
If the nozzle efficiency is 95%, determine the temperature and velocity exiting the nozzle at state 5.
Air exits the intercooler at 330 K. Calculate the temperature at the exit of each compressor stage and the total specific work required.
Compute the power output of the turbine. What fraction of the turbine output is required to drive the compressor? What is the thermal efficiency of the cycle?
Find the combined specific work to the compressor stages. Compare that to the specific work for the case of no intercooler.
Calculate the power output of the turbine. What fraction of the turbine output is required to drive the compressor? What is the thermal efficiency of the cycle?
Use cold air properties (i.e., constant heat capacities at 300 K) and find the compression ratio, the compression specific work, and highest pressure in cycle.
The combustion generates a peak pressure of 5500 kPa. Find the peak temperature, the energy added by the combustion process, and the exhaust temperature.
Find the highest T and P in the cycle, the specific heat transfer added, the cycle mean effective pressure and the total power produced.
Find the temperature after combustion using cold air properties. Find the volumetric compression ratio and the thermal efficiency.
What relationship can you see between this writing and the work of the female painters of the period like Mary Cassatt?
An ideal regenerator is also incorporated into the cycle. Find the thermal efficiency of the cycle using cold air (298 K) properties.
The energy source is 100 kg/s combustion products at 125 kPa, 1200 K. Make sure the air temperature is higher than the water temperature throughout the boiler.
The effect of evaporator temperature on the COP of a heat pump. Plot a curve for the COP versus the evaporator temperature for temperatures from +15 to -25oC.
The condenser pressure is 2.225 lbf/ in.2. Calculate the thermal efficiency of the cycle and the network per pound-mass of steam.
Determine the change in exergy of the water flow and that of the air flow. Use these values to determine the second-law efficiency of the boiler heat exchanger.
A Rankine steam power plant should operate with a high pressure of 3 MPa. Find the maximum water mass flow rate possible and the air exit temperature.
Find the destruction of exergy in four places: inside the heat pump, in the high-T heat exchanger and in the low-T heat exchanger.
Assume both stages have an isentropic efficiency of 85%. Find the second-law efficiencies for both stages of the turbine.
If the steam is throttled down to 2 MPa before entering the turbine, find the actual turbine specific work.
A Rankine cycle with R-410a has the boiler at 600 psia superheating to 340 F. Compute all four energy transfers and the cycle efficiency.
Determine the steam flow rate to the high pressure turbine and the power required to drive each of the pumps.
A smaller power plant produces 50 lbm/s steam at 400 psia, 1100 F in the boiler. Find the net power output and the required mass flow rate of the ocean water.
The source for the boiler is at constant 350 F. Compute the extraction flow rate and state 4 into the boiler.
A closed FWH in a regenerative steam power cycle heats 40 lbm/s of water from 200 F, 2000 lbf/ in2. What is the required mass flow rate of the extraction steam?