Steam is supplied to a two stage turbine at 40 bar and 450°C. It expands in the first turbine until it is just dry saturated, then it is reheated to 450°C and expand through the second stage turbine. The condenser pressure is 0.035 bar. Calculate i. Work output ii. Heat supplied per kg of steam for the plant, assuming ideal processes and neglecting the feed-pump term iii. The specific steam consumption iv. The cycle efficiency Attach File

Steam is supplied to a two stage turbine at 40 bar and 450°C. It expands in the first turbine until it is just dry saturated, then it is reheated to 450°C and expand through the second stage turbine. The condenser pressure is 0.035 bar. Calculate i. Work output ii. Heat supplied per kg of steam for the plant, assuming ideal processes and neglecting the feed-pump term iii. The specific steam consumption iv. The cycle efficiency Attach File

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

3.5 An ammonia refrigeration system operates between saturated suction temperature of -20°C, and saturated discharge temperature of +40°C. Com- pare the COP of the cycle using wet compression with that of the cycle using dry compression. Assume that the vapour leaving the compressor is saturated in the case of wet compression, and the vapour entering the compressor is saturated in the case of dry compression. The refrigerant leaves the condenser as saturated liquid.
Steam is supplied to a two-stage turbine at 48 bar and 400 °C. It expands in the first turbine until it is just dry saturated, then it is re-heated to 400 °C and expanded through the second-stage turbine. The condenser pressure is 0.04 bar. Low-P High-P turbine turbine Reheater Boiler P4 = P3 = Prcheat Condenser find thespecific heat inputof the systemin kJ/kg to 2.d.p. ?
A reversible refrigerator operates using a Carnot refrigeration cycle. It operates usingr-134a between 140 and 400 kPa. The refrigerant exits the compressor (and enters the condenser) assaturated vapor. It also leaves the condenser as saturated liquid.a. Sketch the P-v and T-s diagram of this cycle. Define the coordinate properties of each state oneach graph.b. Evaluate the specific heat and specific work properties of each (in kJ/kg). Indicate the sense.c. Evaluate the coefficient of performance using the specific heats and works from the previousitem. Did it match with the COPR obtained if you used the operating temperatures? Solve for states first. Then, show the solution to each of the above required in order.
A reheater cycle is executed of 1 kg steam expanding initially from 12.547 Mpa and540.547 oC. The reheater pressures are 2.5547 Mpa and the steam leaves the reheaterat 420.547 oC. Condensation occurs at 0.02547 Mpa. Calculate W, ec and ee.
3- A reaction turbine is supplied with steam at (60 bar, 600 C°). The condenser pressure is (0.07 bar). If the reheat factor can be assumed to be (1.04) and the stage efficiency is constant throughout at (80%). Calculate the steam flow required in (ton/hr) for a diagram power of (25 MW). (Ans. 75.6 ton/hr) 4- The steam consumption at full load for a (3 MW) turbine is (16.6 ton/hr). At half load the steam consumption is (9.1 ton/hr). Applying Willan's line, estimate the steam consumption at no load, and the consumption at a load of (2.5 MW). (Ans. 1.6 ton/hr; 14.1 ton/hr)
5.18 : Taking the data of the preceding problem except the final temperature of the cooling water is to be taken to apply to a jet condenser, calculate the weight of injection (cooling) water required per kg of steam.
A thermal power plant operates such that the steam exits boiler at 4 MPa, 400C and the condenser pressure is 10 kPa. The efficiency of the turbine and pump is 85% and 90% respectively. a. Draw the plant PFD (Process Flow Disgram) and the process Ts diagram and calculate quality of steam discharge from the turbine as well as the plant's thermal efficiency. b. If the plant produces 300MW of net power, - What is the steam flowrates in kg/hr? - If the plant uses natural gas as a fuel, determine the flowrate of NG in MMSCMD. State the reference for your data. - If the plant uses coal as a fuel, determine the amount of coal required (tonne per annum). State the reference for your data and all your assumptions. c. How much power required by the pump in kW? Is this the real power required by the pump? Explain d. Find the heat rejected in the condenser and evaluate the thermal efficiency using this value. e. The heat rejected to surrounding is through a cooling water system from a nearby ocean.…
1. Figure shows a reheat cycle in which steam is delivered to the high-pressure turbine at 1100 Ibf/in^2, 740 F, and expanded to 200 Ibf/in^2. After the expansion, the steam is warmed to 720 F before being expanded to 1 lbf/in^2 in the low- pressure turbine. Assume the turbines and pump are adiabatic. Compute the high pressure isentropic turbine work. High Q'în Boi ler Condenser Pump Q out 166.8 Btu/lbm 200.1 Btu/lbm 190.2 Btu/lbm 231.1 Btu/lbm 120.5 Btu/lbm
A reheat cycle with two stages of reheating is executed, with steam expanding initially from 90 bar and 530°C. The two reheater pressures are 10 bar and 0.6 bar, and the steam leaves each reheater at 480°C. Condensation occurs at 0.03 bar. For the engine, ignore the pressure drop through the reheaters, let the engine operate through the same states, and compute the e in %.
The condensing pressure for a Rankine engine is 0.001325 MPavac. Calculate the following for steam flow rate = 1 + (200/13) kg/sec of steam when the steam at the beginning of expansion is at 119.6 deg SH and 4.0 Mpaa. Draw the TS and equipment diagrams for the ideal and actual case and find for the following for the ideal case: PV and TS diagrams of the cycle showing ideal and actual process lines Heat rejected at condenser (KJ/sec). Ans.____________________________ Mass of cooling water in kg/sec if cp H2O = 4.18 KJ/kg-K, and inlet temp of water to condenser = 20 deg C, outlet temp is 35 deg C. Ans.____________________________ Rankine engine efficiency (%). Ans.____________________________ Cycle thermal efficiency ( %). Ans.____________________________
2. Steam at 13.8 MPa and 940°C enters a turbine and expands to 3.8 MPa where m1 is extracted for feedwater heating, the remainder is withdrawn and reheated to 720°C. Expansion then occurs to 0.90 MPa, where m2 is extracted for feedwater heating. The remaining steam is withdrawn and reheated to 5800C. Final expansion now OCcurs to a condenser pressure 0.028 MPa. For an ideal cycle and 1kg of steam, find a) Wnet b) efficiency
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