Chapter 8, Problem 8.54P

Water enters the turbine of an ideal Rankine cycle as superheated vapor at 10 MPa and 600°C. If the condenser pressure is 10 kPa, Calculate the thermal efficiency of the system.

thermodynamics

An r-134a refrigerator operates a simple vapor compression cycle (SVCC). The evaporatoroperates at -10 °C, while the condenser operates at 1 MPa. R-134a flows around the system at 10 g/s.a. Graph the cycle in a P-h diagram and calculate the temperature at the exit of the compressor, assuming it is 100% isentropicallyefficient.b. Calculate the power required by the compressor (in W) and the cooling effect of the refrigerator (in kW) c. Compute for the COP of the system. What is its percent difference from the reversible efficiency?

Example Consider a steam power plant operating on a simple ideal Rankine cycle. The steam enters the turbine at 3 MPa and 350°C and is considered in the condenser at a pressure of 75 kPa. Determine the thermal efficiency of this cycle.

The condensing pressure for a Rankine engine is 1 bar (hf= 417.4 kJ/kg). Calculate the net work for 1 kg/s of steam and the thermal efficiency when the steam at the beginning of expansion is at 50 bar and (a) saturated (b) 350°C and (c) 640°C. Note the variation of efficiency and the quality at the end of the expansion.

Steam is supplied to a two-stage turbine at 40 bar and 350 oC. It expands in the first turbine until it is just dry saturated, then it is reheated to 350 oC and expanded through the second stage turbine; the isentropic efficiencies of the first and second stage turbines are 84 % and 78 % respectively. The condenser pressure is 0.035 bar. Sketch the process on a T-s diagram and calculate;The work output and heat supplied per kg of steam for the plant assuming ideal processesThe thermal efficiency of the cycleThe specific steam consumption

Superheated steam at 10,800 kPa and 580°C, enters the 1st stage turbine and expands to 300 kPa. It is then reheated to 340°C before entering the 2nd-stage turbine where it expands to a condenser pressure of 10 kPa. The net power output is 100, 000 kW. The turbine and pump efficiencies are 82%.   Determine for the cycle: (a) the network per unit mass of steam flow in kJ/kg  (b) the heat transfer rate to steam passing through the boiler and the heat transfer rate to cooling water passing through the condenser in kJ/s  (c) the thermal efficiency.

In a thermal power plant, steam is obtained from the boiler at 70 bar and 450 °C. This steam is expanded in a high pressure (H.P) turbine to 25 bar and then reheated to 420°C at constant pressure. The steam is then expanded in the intermediate pressure (I.P) turbine. Part of the steam leaving the intermediate pressure turbine is taken to an open exchanger at 180°C (FW) and the remaining steam is taken to a low pressure (L.P) turbine, where it is expanded to 0.07 bar. The isentropic efficiency of the high pressure turbine is 78.5%, the intermediate pressure turbine is and the low pressure turbine has an efficiency of 83%. The boiler has a conversion efficiency of 72%. The mass flow rate of water in the boiler is 15 kg/s. For this system calculate:(a) The net power of the cycle.b) The thermal efficiency of the cycle.c) The amount of coal required each hour in the system.d) The hourly price of coal in the system. NOTE: the first thing to do is to locate the properties of the fluid at each…

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