Chapter 8, Problem 8.55P

Steam at 200 bar, 760°C enters the throttle of a reheater engine and expands to 10 bar. At this point itleaves the engine, enters the reheater, and returns at 9 bar, 600°C, expansion then occurs to the condenser pressure of 0.5 bar (hf = 138 kJ/kg) on the basis of flow of 1 kg steam. Find (a) W and e of the cycle, (b) W, e, and m for the ideal engine, (c) In the actual engine the steam enters the reheater at 10 bar, 300°C and later expands to a saturated state at the exhaust to the condenser, find W, e and m.

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, 600C, and saturated liquid exits the condenser at 250 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, 30C, 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 thermal efficiency of the binary cycle.

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

See photo below

Steam is supplied to a two-stage turbine at 40 bar and 350 o 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; i. The work output and heat supplied per kg of steam for the plant assuming ideal processes ii. The thermal efficiency of the cycle iii. The specific steam consumption

Steam enters the turbine of a steam power plant, operating on Rankine cycle, at 10 bar, 300oC. The condenser pressure is 0.1 bar. The steam leaving the turbine is 90% dry. Calculate the adiabatic efficiency of the turbine and the cycle efficiency. Also, draw a suitable h-s diagram. Neglecting pump work

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

A cogeneration system works with a water cycle and a refrigerant (ammonia) cycle combined. Superheated water vapor enters turbine 1 (efficiency of 85%) at a flow rate of 5 kg/sec, 50 bar and 500oC and expands to 1.5 bar. Half of the flow is extracted for industrial heating and the rest enters a heat exchanger. The condensate leaves the heat exchanger as saturated liquid at 1 bar and combines with the return flow from the industrial process, which comes back at 60oC and 1 bar. The combined flow is pumped (efficiency of 85%) to the boiler pressure. The refrigerant cycle is an ideal Rankine cycle. The ammonia enters turbine 2 at a pressure of 14 bar and a temperature of 100oC and leaves the condenser at 3 bar. Calculate: a) The amount of heat required by the boiler, in kW. b) The net power output of the cogeneration system, in kW. c) The heat transfer provided to the industrial process

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.