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Calculate the thermal efficiency of the cycle and the network per pound-mass of steam.
If the steam is throttled down to 300 lbf/ in.2 before entering the turbine, find the actual turbine specific work.
What is the minimum high P and the maximum low P it can use? Determine the COP of this refrigerator for the working fluids R-134a and R-410a.
If 3000 Btu of heat is required in the generator (solar collector) per pound-mass of ammonia vapor generated, determine the overall performance of this system.
Discuss how the Gladstone Committee Report addressed conflict over the words rehabilitation and treatment.
In contrast, the international view, specifically Europe, uses the rehabilitation model.
The molten salt has 5 kg/s flow with Cp = 1.5 kJ/kg K. What is the possible water flow rate, the rate of energy transfer, and the rate of entropy generation?
Steam enters the turbine of a power plant at 5 MPa, 400oC. Find the thermal efficiency of the power plant and how it compares with that of a Carnot cycle.
The turbine efficiency is 85%, and other cycle components are ideal. If the boiler superheats to 800oC, find the cycle thermal efficiency.
A new air conditioner using R-410a is used in heat pump mode. Find the COP, the heating rate, and the rate of entropy generation for the heat pump.
Find the high temperature, the condensing temperature and the COP if it is used in a standard cycle with high and low pressures of 6 MPa and 3 MPa respectively.
After the compressor, the temperature is measured to be 60oC. Find the actual compressor work and the actual cycle COP.
Determine the amount of energy saved by using the heat pump instead of directly heating the water from 15oC to 60oC.
Determine the entropy generation in the compression process, the refrigeration capacity, and the COP for this cycle.
The condenser must reject 25 MW from the water to the air. Find the flow rate of air and the second-law efficiency of the heat exchanger.
Determine the flow of exergy into or out of the reservoirs per kilogram of steam flowing in the cycle. What is the overall cycle second-law efficiency?
A heat source is available at 100oC. Also find the efficiency of the heat engine part and the COP of the refrigeration cycle part.
A Rankine cycle flows 5 kg/s ammonia at 2 MPa, 140oC to the turbine, which has an extraction point. Find the extraction flow rate and state 4 into the boiler.
A power plant with one closed FWH has a condenser temperature of 45oC. Find the fraction of extraction steam flow and the two specific pump work inputs.
Consider an ideal steam regenerative cycle in which steam enters the turbine at 3.0 MPa. Calculate the thermal efficiency of the cycle and the specific network.
If the river water should not be heated more than 5oC, how much water should be pumped from the river to the heat exchanger (condenser)?
An open FWH receives steam at 1 MPa, 200oC from the turbine and 1 MPa, 100oC water. Find the required fraction of the extraction flow in the turbine.
Calculate the cycle thermal efficiency and the moisture content of the steam leaving the low pressure turbine.
Find the reheat temperature so that the turbine output is saturated vapor. For this reheat, find the total turbine power output and the boiler heat transfer.
Consider the supercritical cycle in Problem 9.30. Find the combined specific turbine work and the total specific heat transfer in the boiler.