A cold-air standard diesel cycle has a cut-off ratio of 2.4. The temperature and pressure at the end of the expansion process are 48 psia and 1830 R, respectively. Each cycle rejects 346 Btu of heat. If the pressure and volume at the beginning of the heat addition process are 700 psia and 1.0 ft3, determine the (a) heat added per cycle, in Btu (b) net work, in Btu (c) maximum temperature in the cycle, in R (d) thermal efficiency, in % (e) mean effective pressure, in psia, and (f) the compression ratio. Use ??= 0.718 kJ/kg-K, ??= 1.005 kJ/kg-K and ?= 1.4.

A power cycle operates between two thermal reservoirs at 300 K and 800 K. The working fluid of the cycle is air, which can be considered to be an ideal gas. Specific heats are not assumed to be constant. An inventor claims that for a heat input of 250 kJ, the net work from the cycle is 80 kJ. The work generating component in the cycle is a reversible, steady state turbine. The inlet pressure and temperature are 1000 kPa and 600 K and the exit temperature is 550 K. The turbine receives 150 kJ/kg of heat from the high temperature reservoir and loses 10 kJ/kg of heat to the ambient at 298 K. (a) Prove whether or not the overall cycle is possible using second law arguments. (b) determine the work done by the turbine [kJ/kg]

A medium size power station is used to produce 30 MW net power for a refinery. The station uses steam as the operating fluid and operates according to the Carnot cycle between the pressure limits of 0.4 bar and 35 bar. Steam enters the boiler as a saturated liquid and leaves it as a dry saturated vapour. (x) State the name of the cycle that is used in practice in power stations, along with three key benefits over the Carnot cycle.

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