A steam powerplant operates on the Rankine cycle. Determine the steam rate, the heat transfer- rates in the boiler and condenser, and the thermal efficiency of the plant Given Data: P: = P3= 9000 kPa; T3= 650 degree Celsius; P4 = P, = 20 kPa; Efficiency (turbine) = 0.85; Efficiency (pump) = 0.80; Power rating = 50000 kW %3D %3! %3D %3D

A steam powerplant operates on the Rankine cycle. Determine the steam rate, the heat transfer- rates in the boiler and condenser, and the thermal efficiency of the plant Given Data: P: = P3= 9000 kPa; T3= 650 degree Celsius; P4 = P, = 20 kPa; Efficiency (turbine) = 0.85; Efficiency (pump) = 0.80; Power rating = 50000 kW %3D %3! %3D %3D

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter28: Special Refrigeration Applications

Section: Chapter Questions

Problem 15RQ: Why is two-stage compression popular for extra-low-temperature refrigeration systems?

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Refrigerator 1 simulates an ideal refrigerator and therefore operates on a Carnot cycle using R-134a as the refrigerant at a flow rate of 1.4 kg/sec. The condensing and evaporating temperatures are 30 °C and -10 °C, respectively. To assess the performance of Refrigerator 1, you must submit the report. of the project with the following information: d) The work generated by the turbine; e) The condenser heat rejection rate (Q H); f) The coefficient of performance of the cycle.
A Steam Power Plant operates on the Rankine Cycle in which steam at 22 bar and dryness fraction of 0.95 enters the turbine and exhausts to a pressure of 0.1 bar in acondenser. The condensate is pumped as feedwater to the Boiler in which the steam is generated. Sketch the T-s diagram for this cycle and calculate the following performance parameters:(i) Cycle Thermal Efficiency(ii) Specific Steam Consumption(iii) Condenser Heat Load(iv) Cooling Water mass and volumetric flow rates for the condenser if the cooling water enters at 26 oC and leaves at 40 oC for a net power output of 24,000 kW. The specific heat capacity of the cooling water can be taken as 4.0 kJ/kg K and its density as 1023 kg/m3.
Which of the following will result to an increase in thermal efficiency of a steam power plant utilizing the Simple Rankine Cycle, assuming that both condenser and boiler operating pressures remain constant. I. Increasing the turbine outlet temperature.II. Increasing the boiler outlet temperature a.Both I and II b.I only c.Neither I nor II d.II only
In a steam power plant that operates based on a Rankine cycle, the operating pressures of the steam generator and the condenser are 10,000 and 10 kPa, respectively. If the turbine inlet stream is saturated vapor and the condenser outlet flow is saturated liquid, determine the specific heat transfers in the steam generator and the condenser, the specific work involved in the turbine and the pump, and the thermal efficiency and the BWR of the cycle. Also, if the power plant produces 250 MW power, determine the mass flow rate of the cycle’s working fluid.
An ideal Rankine cycle operates between the pressure limits of 15,000 kPa in the boiler and 15 kPa in the condenser. If the turbine inlet temperature is 500 deg C and the cycle produces 2500 kW of net work, determine the mass flow rate of the steam in kg/s. Refer to the tables below. a. 1.993 b. 2.122 c. 1.856 d. 2.016
The mass flow rate of steam is 5 kg/s for a Rankine Cycle. For the actual cycle, the turbine efficiency is 86%, turbine brake efficiency is 80%, and generator efficiency=90%. The inlet conditions of the turbine are 3MPa and 400⁰C while the condensing pressure is 50kPa. a. Sketch the P-v, T-s and h-s diagram of the Cycle b. Calculate for the ideal and actual steam rates and heat rates of the Rankine Cycle and Rankine Engine, respectively. c. Determine the energy chargeable and combine thermal efficiencies for the Rankine Cycle and Rankine engine, respectively
A Rankine-cycle steam power plant has a 5-MPa/450°C throttle and 10-kPa condenser pressure . the generator produces 19 MW at an efficiency of 95% and mechanical efficiency of 96%. The actual expansion of the turbine is 85%. a.)Determine the ideal engine heat rate in kj/kWh. b.) Determine the indicated power in kW. c.) Determine the ideal cycle steam rate in kg/kWh. d.) determine the theoretical engine thermal efficiency in %. e.) determine the mass flow rate of steam in kg/s. f.) determine the ideal wok of the turbine in kj/kg. g.)Determine the theoretical cycle thermal efficiency in %.
A steam power plant operates on a simple ideal Rankine cycle between the pressure limits of 1250 and 2 psia. The mass flow rate of steam through the cycle is 75 lbm/s. The moisture content of the steam at the turbine exit is not to exceed 10 percent. Show the cycle on a T-s diagram with respect to saturation lines, and determine (a) the minimum turbine inlet temperature, (b) the rate of heat input in the boiler, and (c) the thermal efficiency of the Cycle. Answers:
Q.3 A. Calculate the thermal efficiency of a Rankine cycle in which the steam is initially dry saturated at 2 Mpa and the condenser pressure 75 kN / m². Express this efficiency as a percentage of a Carnot cycle efficiency of the same limits of temperature. B. If the steam leaves the boiler at 350 ° C with the same pressure of the boiler and condenser given above. Explain why the Rankine efficiency in (A) is less than in (B), and why the ratio of efficiencies of the respective Rankine and Carnot is greater.
Determine the thermal efficiency of a simple rankine cycle.
A steam-powered power plant works on the basic Rankine cycle.shown in the figure. Likewise, some of its thermodynamic states are summarized in the attached table.Knowing that the work per unit mass delivered to the pump is 3W4 = 2480 (J/kg], determinein SI units the following: a) The specific volume of water in state 4.b) The associated work per unit mass, developed in the Curbina.c) The associated heat per unit mass released by the water in the condenser.d) The efficiency of the cycle
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