Chapter 8, Problem 8.21CU

shown below is P-V diagram for a reversible cycle enclosed by 4 reversible process curves.  The curve 1-2 and the curve 3-4 are  reversible isothermal processes, and the curve 2-3 and the curve 1-4 are reversible adiabatic processes. If the cycle direction is counter clockwise, answer the question below. What is the cycle?____             A. Carnot cycle   B. ideal heat engine cycle   C. Carnot refrigeration cycle   D. Reversed refrigeration cycle

Thermodynamics: Please show step by step solution for the given practice problem

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

3. 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. (vii) Using the highest and lowest temperature values in the cycle, recalculate the efficiency of the cycle and show that it is equivalent to the result in part (vi). (viii) Calculate the thermal efficiency of the power station if the isentropic efficiency of the steam turbine is 94%. (ix) State main disadvantages of using the Carnot cycle as the basis for a power station. (x) State the name of the cycle that is used in practice in power stations, along with three key benefits over the Carnot cycle.

Q2. A gas turbine operates between pressures of 3 and 9 bar with a minimum and maximum cycle temperatures of 40 "C and 1500 °C. Both the compressor and turbine have isentropic efficiencies of 92%. The mass flow rate through the turbine is 0.4 kg/s. (a) 1. Sketch the ideal cycle on a T-s diagram including labels for: the different states (using the numbering in Figure Q2), heat and work transfers, as well as the pressure and temperature values given above. And add the curves and appropriate labels that show the effect of irreversible processes. ii. Starting from the relationship between pressure and volume for an ideal gas undergoing an isentropic process, and the ideal gas equation (both in Table 2), demonstrate the relationship between temperatures and pressures (Eq. Q2). T2 (Eq. Q2) Where: y is the ratio for specific heat, and 1 and 2 are the initial and final states. iii. Write down the equations for the isentropic efficiencies of the compressor and turbine as a function of the…

A power plant using a Rankine power generation cycle and steam operates at a temperature of 81.25°C in the condenser, a pressure of 5 MPa in the boiler and a maximum boiler temp of 775°C. The cycle operates at steady state with a mass flow rate of 2.5kg/s. Use the steam tables in the appendix of Sandler (p. 917 to 925). a.) Draw out the cycle, calculate the work required for the pump, the work output by the turbine, the heat into the boiler, and the heat out of the condenser. b.) What is the efficiency of this power plant? c.) If the turbine was only 89% efficient but still adiabatic (only generates 89% of the calculated work from part b), what is the overall efficiency of the cycle?

If the difference between the temperature limits of a Carnot cycle is 300C and the thermal efficiency is 65.43%, determine the higher temperature limit of the cycle.a. 458.5051C b. 458.5052C c. 458.5053C d. 458.5054C

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

(A) the net heat energy absorbed during a cyclic process (the difference between heat flowing into the system and heat leaving the system) is the work. If we regard the atmosphere as a heat engine, what is the work being done by the atmosphere? That is, what phenomenon or phenomena are a realization of the work being done by the atmosphere? (B) Of all possible heat engines, the Carnot cycle has the maximum efficiency between any two operating temperatures (think of these temperatures as the maximum and minimum temperatures encountered during the cycle). Estimate the Carnot efficiency of Earth's atmosphere. [Hint: Think about the temperature variation with latitude.] (C) Do you think the efficiency of the real atmosphere would be "close" or "far" from the Carnot efficiency? Please explain your answer.