A steam turbine is to operate on a simple regenerative cycle. Steam is supplied dry saturated at 40 bar, and is exhausted to a condenser at 0.07 bar. The condensate is pumped to a pressure of 3.5 bar at which it is mixed with bleed steam from the turbine at 3.5 bar. The resulting water which is at saturation temperature is then pumped to the boiler. For the ideal cycle calculate, neglecting feed-pump work, ti) the amount of bleed steam required per kilogram of supply steam; (ii) the cycle efficiency of the plant; (iii) the specific steam consumption. t i r

A steam turbine is to operate on a simple regenerative cycle. Steam is supplied dry saturated at 40 bar, and is exhausted to a condenser at 0.07 bar. The condensate is pumped to a pressure of 3.5 bar at which it is mixed with bleed steam from the turbine at 3.5 bar. The resulting water which is at saturation temperature is then pumped to the boiler. For the ideal cycle calculate, neglecting feed-pump work, ti) the amount of bleed steam required per kilogram of supply steam; (ii) the cycle efficiency of the plant; (iii) the specific steam consumption. t i r

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

Chapter45: Domestic Refrigerators And Freezers

Section: Chapter Questions

Problem 9RQ: The defrost cycle in a domestic refrigerator may be terminated by two methods: ___and___.

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from thermodynamics A steam power plant operates between a boiler pressure of 48 bar and a condenser pressure of 0.04 bar. Calculate for these limits the cycle efficiency for a Rankine cycle with dry saturated steam at entry to the turbine.
8.1 (a) Steam is supplied, dry saturated at 40 bar to a turbine and the condenser pressure is 0.035 bar. If the plant operates on the Rankine cycle, calculate, per kilogram of steam: (i) the work output neglecting the feed-pump work; (ii) the work required for the feed pump: (iii)the heat transferred to the condenser cooling water, and the amount of cooling water required through the condenser if the temperature rise of the water is assumed to be 5.5 K: (iv) the heat supplied; (v) the Rankine efficiency: (vi) the specifie steam consumption (b) For the same steam conditions calculate the efficiency and the specific steam consumption for a Carnot cycle operating with wet steam.
8.1 (a) Steam is supplied, dry saturated at 40 bar to a turbine and the condenser pressure is 0.035 bar. If the plant operates on the Rankine cycle, calculate, per kilogram of steam: (i) the work output neglecting the feed-pump work; (ii) the work required for the feed pump: (iii) the heat transferred to the condenser cooling water, and the amount of cooling water required through the condenser if the temperature rise of the water is assumed to be 5.5 K; (iv) the heat supplied; (v) the Rankine efficiency: (vi) the specific steam consumption. (b) For the same steam conditions calculate the efficiency and the specific steam consumption for a Carnot cycle operating with wet steam.
Q2) The following data relate to a regenerative steam power plant generating 22500 kW energy, the alternator directly coupled to steam turbine : Condition of steam supplied to the steam turbine 60 bar, 450 degrees * C Condenser vacuum ... 707.5 mm Pressure at which steam is bled from the steam turbine ... 3 bar Turbine efficiency of each portion of expansion ... 87 per cent Boiler efficiencyper cent Alternator efficiency ... 94 per cent Mechanical efficiency from turbine to generator ... 97 per cent Neglecting the pump work in calculating the input to the boiler, determine (i) The steam bled per kg of steam supplied to the turbine. (ii) The steam generated per hour if the 9 percent of the generator output is used to run the pumps. (iiiThe overall efficiency of the plant.
Given a rankine cycle with reheat operating with the following conditions: Boiler Exit Conditions: 10.356 Mpa, 600.356C , and 7 kg/s Reheat One leg Exit Conditions: 1.6 MPa and 600.356 C Reheat two leg Exit conditions: 1.1356 MPa and 500.356C Reheat three leg exit conditions: 0.8356MPa and 400.356C Condenser Operating Pressure: 30.356 kPa Assume all devices are ideal. Determine the power output, heat transfer rate input required, and thermal cycle efficiency of the plant. Draw the schematic diagram and T-s diagram.
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.
A steam power plant operates between a boiler pressure of 52 bar and a condenser pressure of 0.045 bar. Calculate for these limits the cycle efficiency for a Rankine cycle with dry saturated steam at entry to the turbine. NB:Answer in decimal and not percentage to 4 decimal places.
1. In a Rankine cycle, steam enters the turbine at 2.5 MPa and condenser of 50 kPa.What is the thermal efficiency of the cycle? 2. Steam enters the superheater of a boiler at a pressure of 25 bar and dryness of 0.98 and leaves at the same pressure at a temperature of 370OC. Calculate the heat energy supplied per kg of steam supplied in the superheater. Kindly answer question 1 and 2 and show solution. Please help me. Thank you
A certain factory has an average electrical load of 1500 kW and requires 3.5 MJ/s for heating purposes. It is proposed to install a single-extraction passout steam turbine to operate under the following conditions: Initial pressure 15 bar. Initial temperature 300°C. Condenser pressure 0.1 bar. Steam is extracted between the two turbine sections at 3 bar, 0.96 dry, and is isobarically cooled without subcooling in heaters to supply the heating load. The internal efficiency of the turbine (in the LP Section) is 0.80 and the efficiency of the boiler is 0.85 when using oil of calorific value 44 MJ/kg. If 10% of boiler steam is used for auxiliaries calculate the oil consumption per day. Assume that the condensate from the heaters (at 3 bar) and that from the con- denser (at 0.1 bar) mix freely in a separate vessel (hot well) before being pumped to the boiler. Neglect extraneous losses.
A Rankine cycle with reheating has a throttle pressure of 135 bars at the turbine inlet and 28 bars reheat pressure, the throttle and reheat temperature of the steam is 540 degree celsius, condenser pressureis 0.034 bar, mass flow rate of steam is 12 kg/sec. Draw the T-S and Schematic diagram of cycle and determine the following: d. The steam rates e. Heat rate of the cycle f. Pump Work g. Turbine Work
A simple Rankine cycle uses water as the working fluid. Water enters the pump as a saturated liquid at 10 kPa and exits at a pressure of 5 MPa. Water enters the condenser as a saturated mixture with a quality of 90%. Assume that the cycle is ideal. 1. What is the temperature of the turbine inlet, in °C? Report your result to one decimal place using rounding. 2. How much heat was added in the boiler, in kJ/kg. Round to the nearest whole number. 3. How much heat was removed in the condenser? Round your answer to the nearest whole number. 4. What is the net work produced, in kJ/kg. Round your answer to the nearest whole number.
(b) A steam power plant operates on a theoretical reheat cycle. Steam at 25 bar pressure and 400°C is supplied to the high pressure turbine. After its expansion to dry state, the steam is reheated at constant pressure to its original temperature. Subsequent expansion occurs in the low pressure turbine to a condenser pressure of 0.04 bar. Considering feed pump work, Calculate: (i) Quality of steam at entry to condenser (ii) Thermal efficiency (iii) Specific steam consumption.