PROBLEM: A reheat cycle with two stages of reheating is executed with steam expanding initially from 200 bar (20 Mpaa) and 540 deg C. The 2 reheater pressures are 40 bar (4 Mpaa) and 10 bar (1 Mpaa) and the steam leaves each reheater at 540 deg C. Steam is bled in between two reheating sessions at a pressure equal to 20 and 15 bars into 2 open feedwater heaters with the aforementioned operating pressures. Condensation occurs at 60 deg C. All expansion and compression efficiencies are 90 %. For 10 Kg/sec of working substance circulated, answer the following, and fill up the blanks in the items below: 1. Equipment and TS diagram with the cycle . 2. Actual mass of steam bled into the open heaters (kg/kg) = a) b). 3. Ideal turbine work in KW. Answer:

PROBLEM: A reheat cycle with two stages of reheating is executed with steam expanding initially from 200 bar (20 Mpaa) and 540 deg C. The 2 reheater pressures are 40 bar (4 Mpaa) and 10 bar (1 Mpaa) and the steam leaves each reheater at 540 deg C. Steam is bled in between two reheating sessions at a pressure equal to 20 and 15 bars into 2 open feedwater heaters with the aforementioned operating pressures. Condensation occurs at 60 deg C. All expansion and compression efficiencies are 90 %. For 10 Kg/sec of working substance circulated, answer the following, and fill up the blanks in the items below: 1. Equipment and TS diagram with the cycle . 2. Actual mass of steam bled into the open heaters (kg/kg) = a) b). 3. Ideal turbine work in KW. Answer:

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

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Question

PROBLEM: A reheat cycle with two stages of reheating is executed with steam expanding initially from 200 bar (20 Mpaa)
and 540 deg C. The 2 reheater pressures are 40 bar (4 Mpaa) and 10 bar (1 Mpaa) and the steam leaves each reheater at
540 deg C. Steam is bled in between two reheating sessions at a pressure equal to 20 and 15 bars into 2 open feedwater
heaters with the aforementioned operating pressures. Condensation occurs at 60 deg C. All expansion and compression
efficiencies are 90 %. For 10 Kg/sec of working substance circulated, answer the following, and fill up the blanks in the
items below:
1. Equipment and TS diagram with the cycle .
2.
Actual mass of steam bled into the open heaters (kg/kg) = a)
b).
3.
Ideal turbine work in KW. Answer:
4.
Actual steam rate in Kg/KW-hr. Answer:
5.
Heat rejected at the condenser in KW. (ACTUAL) Answer:

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Problem 2: Consider the following Rankine cycle with reheat (notice the numbering here is different from the previous diagram). Steam enters the high pressure turbine at 14MPa and 600C, and is reheated at constant pressure to 600C. It exits the second, low pressure turbine at 10kPa with a quality of 89.4%. Given 2 1 3 4 P3 = 14MPa T3 = 600°C 5 T5 = 600°C Condenser High P. 6 Low P. PG = 10kPa x6 = 89.6% (i.e. moisture content Is limited to 10.4%) Find P4, nth Assumptions SS, Ake = Ape = 0 Ideal cycle (isentropic efficiency of turbine and pump are 100%, no heat transfer where unintended, no pressure drops due to friction) P₂ = P3, P4 = P5, P6 = P₁
My Question: In the steam plant problem#2, the reheater developed a leak and it was decided to run the plant bypassing the reheater. Determine the thermal efficiency and steam flow rate to develop the same power output.Problem 2 (In a reheat cycle steam enters the high-pressure turbine at 40 bar and 400C. It expands isentropically to 6 bar and is reheated at constant pressure to 400C. This steam is expanded isentropically in the low pressure turbine to the condenser pressure of 0.1 bar. Calculate the thermal efficiency and steam consumption for 10 MW output.)
Enumerate the four processes comprised in the cycle of a typical heat engine
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The ordinary household refrigerator is a good example of the application of this cycle. Evaporator Freezer compartment Capillary ube Kitchen air 25°C -18°C Condenser coils 3°C Comprosor HW: Q1: Refrigerant-134a is the working fluid in an ideal compression refrigeration cycle. The refrigerant leaves the evaporator -20°C and has a condenser pressure of 0.9 MPa. The mass flow rate is 3 kg/min. Find COP,, COPR. Camat for same Tmas and Tmin, and the tons of refrigeration. Q2: A simple VCRC using R-134a operates with a condensing temperature of 30°c and an evaporating temperature of -20°c .The system produces 50 kw of refrigeration. Determine the : a) Thermodynamic property values at the four main state points of the cycle, b) COP, c) Rate of refrigerant flow. Another measure of the effectiveness of the refrigeration cycle is how much input power to the compressor, in horsepower, is required for each Ton of cooling. The unit conversion is 4.715 hp per Ton of cooling To convert from COP to…
PROBLEM: A reheat cycle with two stages of reheating is executed with steam expanding initially from 200 bar (20 Mpaa) and 540 deg C. The 2 reheater pressures are 40 bar (4 Mpaa) and 10 bar (1 Mpaa) and the steam leaves each reheater at 540 deg C. Steam is bled in between two reheating sessions at a pressure equal to 20 and 15 bars into 2 open feedwater heaters with the aforementioned operating pressures. Condensation occurs at 60 deg C. All expansion and compression efficiencies are 90%. For 10 Kg/sec of working substance circulated, answer the following, and fill up the blanks in the items below: 7. Actual Heat Added (KW). Answer: _____________8. Actual Rankine cycle efficiency % Answer: ___________________9. If the generator efficiency = 95%, and negligible turbine bearing friction loss, what is the brake work in KW? Answer: ____________
2- An ideal reheat cycle works between pressures of (120 and 0.035 bar). The steam is superheated to (570 C°) and after isentropic expansion to the dry saturated state is reheated to (500 C°). Calculate the thermal efficiency of the cycle taking account of the feed pump work.
Complete solution and units please. Use the steam tables provided, and use 4 decimal places for solving. Final answers are shown in 2 decimal places. Draw the T-S diagram properly with respect to the saturation line. 2. A steam power plant uses the ideal Regenarative Rankine cycle with single open feedwater heater where the steam enters the high pressure turbine at 4 UPa and sooc. At partially expands to 600 kPa then some steam is extracted at this point. The remaining steam expands and enters the condenser at 10 kPa. Sketch the schematic diagram and the TS diagram with labeled points, and solve for marr taken for feedwater heating, Qa, Qr, Wt, Wp. What, thermal exter efficiency and Steam rate. Neglect the condensate pump work." Answer: 20.01% 2286.40 kJ. 1457.51 kJ 1 832.54 kJ 1 kg 3.74 kJ kg kg 36.25%, 4.34 £] 828.89 kJ " kg ку. kuh Specific Volume Internal Sal. Enthalpy Press. MPa Se Entropy Sat, V Sat. Sat. Sat. Evap. Liquid Evap. Vapor Vapor р 10¹ Liquid Uy 103 apor U₂ h, hre h₂…