Chapter 8, Problem 8.12CU

The Brayton cycle, or one gas turbine cycle, operates between 1 bar and 300 K and 5 bar and 1000 K. Air is sucked into a double-acting compressor with cooling between the compression stages and, likewise, expansion. The turbine takes place in two stages with heating. complete during the expansion stage, calculate (a) Appropriate pressure between compression and expansion stages (bar) (b) net export work and (c) the ratio of work to drive the compressor to the work from the turbine

The compression in the Otto cycle involves an isentropic process in a closed piston-cylinder assembly, whereas the compression in the ideal Brayton cycle involves an isentropic process in a(n) operating at steady state.

Rankine Cycle (Thermodynamics) Show the illustration diagram and complete and step by step solution.

1. The working substance for a Carnot cycle is 8 lb of air. The volume at the beginning of isothermal expansion is 9 cu ft and the pressure is 300 psia. The ratio of expansion during the addition of heat is 2 and the temperature of the cold body is 90°F. Find (a) Q,, (b) Q, (c) V3, (d) pg, (e) V,, (f) P,, (g) pm, (h) the ratio of expansion during the isentropic process, and (i) the overall ratio of compression.

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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]

Fill in the blank:   The compression in the Otto cycle involves an isentropic process in a closed piston-cylinder assembly, whereas the compression in the ideal Brayton cycle involves an isentropic process in a(n) (Type your answer here) operating at steady state.

A cycle operates on air occurs as follows: an isentropic compression 1-2, a constant -pressure expansion 2-3, an isentropic expansion 3-4, and finally a constant volume cooling 4-1. The ratio of compression during isentropic compression is 14, ratio of expansion during constant-pressure expansion is 2, P1 = 47 kPa, T1 = 32oC, V1 = 0.2 m3. Find the heat added.

Given the following volume of an ideal Diesel Cycle: 1.8 ft³/lb, 3.7 ft3/lb and 19.6 ft3/lb. Determine the thermal efficiency.