Saturated steam is generated in a boiler by converting a saturated liquid to a saturated vapor at 200 psia. This is done by transferring heat from the combustion gases, which are at 700°F, to the water in the boiler tubes. Calculate the wasted work potential associated with this heat transfer process. HowHow does increasing the temperature of the combustion gases affect the work potential of the steam stream? Take T0 = 80°F and P0 = 14.7 psia.

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Devices can be combined to perform a variety of tasks. An adiabatic compressor, with air as the working fluid, is to be powered by an adiabatic steam turbine, which is also driving a generator. Steam enters the turbine at 12.5 MPa and 500 ∘C at a steady rate of 27.30 kg/s and exits at 10 kPa and a quality of 0.8710. Air enters the compressor at 98 kPa and 295.0 K K at a steady rate of 12.600 kg/s and exits at 1 MPa and 635.0 K. For air, MW=29.0 g/mol, Cp=3.5R. Note: The IUPAC sign convention for work is used. Work into the system has a positive value. What is the magnitude of the power delivered to the generator by the turbine? The answer needs to be in MW.

Air (cp = 1.005 kJ/kg·°C) is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. Air enters the heat exchanger at 95 kPa and 20°C at a rate of 0.75 m3/s. The combustion gases (cp = 1.10 kJ/kg·°C) enter at 160°C at a rate of 0.95 kg/s and leave at 95°C. Determine the rate of heat transfer to the air and its outlet temperature. The rate of heat transfer to the air is ___ kW. The outlet temperature is ___°C.