Chapter 8, Problem 8.62P

can you explain 2 picture

1. 451.8 C 2. 548.04 kw 3. 765.526 K Need last three

3. In a gas turbine plant air is compressed from 1.01 bar and 15 °C through a pressure ratio of 5. It is then heated in a combustion chamber at constant pressure to a temperature of 700 °C and expanded to atmospheric pressure in a turbine. The isentropic efficiencies of compression and expansion are respectively 0.8 and 0.85. Calculate (a) the cycle efficiency and (b) the work ratio. Assume that the properties of air do not change with temperature and may be taken as Cp = 1.005 kJ/kg K and y = 1.4.

4. In a Rankine Cycle, saturated liquid water at 0.1 bar is compressed isentropically to 55 bar. First by heating in a boiler, and then superheating at constant pressure at 55 bar, the water substance is brought to 644 degrees Fahrenheit. After adiabatic reversible expansion in a turbine to 1 bar, it is then cooled in a condenser to a saturated liquid. Draw the flow diagram and T-s diagram. a) What is the moisture content at the exit of the turbine %? b) How much pump work is required, in kJ/kg? c) How much work is generated in the turbine, in kJ/kg? d) What is the thermal efficiency of the cycle %?

A 136 kg/s steam with an inlet condition of 52 bar, 400 C enters a rankine turbine and expands to 36 kPa. determine the work, the thermal efficiency, and the steam rate (a) for the cycle, (b) for the turbine. (c) With the same specifications, consider the steam expanded on an actual turbine and the brake steam rate is 4800 g/kwh and the driven electric generator has an efficiency of 0.93. Find Brake Thermal Eff, Brake Engine Eff, Combined Work, and quality or temperature of actual exhaust steam

IMPORTANT: For problem solving items, start your solution by presenting the cycle in P-v and T-s diagrams. Label all points and mark the process where the heat is added and rejected. Also mark the area showing the net work of the cycle. The parameters of the initial state of one kilogram of air in the cycle of an internal combustion engine are o.095 MPa and 65 deg.C. The compression ratio is 12. Compare the values of the thermal efficiency for isobaric and isometric heat supply in the amounts of 820 kJ.

THERMODYNAMICS Figure P9.290 shows two Brayton cycles, labeled A and B, each having the same turbine inlet temperature and the same mass flow rate. a. The cycle having the greater net power output is b. The cycle having the greater thermal efficiency is Cycle A: 1-2-3'-4'-1 Turbine inlet 3 3 temperature 2' Cycle B: 1-2-3–4–1 FIGURE P9.29C

7. Steam at 7.2 MPa, 600OC expands in a Rankine turbine to 0.45 MPa. For 180 kg/s of steam, determine the work, the thermal efficiency, and the steam rate (a) for the cycle, (b) for the turbine with the same specifications, the brake steam is 7.40 kg/kW-h and the driven electric generator has an efficiency of 91%. (c) Find eb, nb, WK, and quality or actual exhaust steam. Please answer letter c. Thanks

Discuss and Illustrate the PV diagram for Carnot Cycle.