Chapter 8, Problem 8.53P

Water is the working fluid in a cogeneration cycle that generates electricity and provides heat for campus buildings. Steam at 2 MPa, 300 oC, enters a two-stage turbine with a mass flow rate of 0.80 kg/s. A fraction of the total flow, 0.15, is extracted between the two stages at 0.15 MPa to provide for building heating, and the remainder expands through the second stage to the condenser pressure of 7 kPa. Condensate returns from the campus buildings and passes through a trap into the condenser, where it is reunited with the main feedwater flow. Saturated liquid leaves the condenser at 7 kPa. Both turbine and pump are considered isentropic. Determine, in kW: (a) the rate of heat transfer to the working fluid passing through the steam generator; (b) the rate of heat transfer for building heating; and (d) the % utilization factor.

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

A 330 MW steam power plant operates according to the simple ideal Rankine cycle. Water vapor enters the turbine at a pressure of 10 MPa and a temperature of 525 ° C and expands to a condenser pressure of 15 kPa. Show the cycle in a T-s diagram with the saturated liquid and saturated vapor curves and calcualte the; a)The degree of dryness of the steam at the turbine outlet. b)Thermal efficiency of the cycle. c)The mass flow of water vapor circulating in the cycle.

Need help with this engineering problem.   Steam enters the turbine of a simple vapor power plant with a pressure of 12 MPa and a temperature of 500°C and expands adiabatically to condenser pressure, p. Saturated liquid exits the condenser at pressure p. The isentropic efficiency of both the turbine and the pump is 84%.For p = 100 kPa, determine: (a) the turbine exit quality, in percent.(b) the cycle thermal efficiency, in percent.

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?

generating stations

4. An ideal vapor-compression heat pump cycle with Refrigerant 134a as the working fluid provides heating at a rate of 15 kW to maintain a building at 20°C when the outside temperature is 5°C. Saturated vapor at 2.4 bar leaves the evaporator, and saturated liquid at 8 bar leaves the condenser. Calculate (a) The power input to the compressor, in kW. (b) The coefficient of performance. (c) The coefficient of performance of a Carnot heat pump cycle operating between thermal reservoirs at 20 and 5 °C.

2. A steam turbine installation takes steam at 70 bar, with 100°C of superheat, and expands to an exhaust pressure of 0.06 bar. If the efficiency ratio on the Rankine cycle is 0.75, determine the thermal efficiency of the installation and the specific steam consumption rate in kg/kWh. (0.29, 4.19)

A binary vapor power cycle consists of two ideal Rankine cycles with steam and Refrigerant 134a as the working fluids. The mass flow rate of steam is 2 kg/s. In the steam cycle, superheated vapor enters the turbine at 8 MPa, 560°C, and saturated liquid exits the condenser at 50 kPa. In the interconnecting heat exchanger, energy rejected by heat transfer from the steam cycle is provided to the Refrigerant 134a cycle. The heat exchanger experiences no stray heat transfer with its surroundings. Superheated Refrigerant 134a leaves the heat exchanger at 600 kPa, 30°C, which enters the Refrigerant 134a turbine. Saturated liquid leaves the Refrigerant 134a condenser at 100 kPa.Determine:(a) the net power developed by the binary cycle, in kW.(b) the rate of heat addition to the binary cycle, in kW.(c) the percent thermal efficiency of the binary cycle.(d) the rate of entropy production in the interconnecting heat exchanger, in kW/K.