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In: Mechanical Engineering

(REGENERATIVE CYCLE WITH ONE CLOSED AND ONE OPEN HEATER): Do not use your Steam Tables. Refer...

(REGENERATIVE CYCLE WITH ONE CLOSED AND ONE OPEN HEATER): Do not use your Steam Tables. Refer to the H2O properties given in the table below.

A regenerative cycle with one stage of reheating is executed with steam expanding initially from 20 Mpaa and 540 deg C. The reheater pressure is 10 Mpaa. The steam leaves the reheater at 540 deg C. Steam is bled after reheating to one CFWH and on one OFWH a pressure equal to 5 Mpaa and 1 Mpaa respectively. The condensate of the steam used in the CFWH is routed to the OFWH through a trap. The CFWH has a Terminal Difference of 4 deg. C. Condensation occurs at 60 deg C. Sketch the equipment and TS diagram. Isentropic expansion and compression efficiencies are 90 %. nk = 80%. Answer the following for 2.0 kg/sec of total steam circulated, and fill up the blanks with your answers in the items below:

Properties of H2O

Location

H (KJ/Kg) (adiabatic efficiencies not applied)

Steam turbine entry

H1=3363.50

Steam entry to reheater

h2=3155.40

Steam from reheater to turbine

H3=3475.80

Steam entry to CFWH from turbine

H4=3250.13

Steam entry to OFWH from turbine

H5=2842.94

Steam entry to condenser

H6=2215.05

Feedwater/condensate from the condenser and at pump inlet

H7=251.13

Feedwater entry to OFWH

H8=252.13

Feedwater from OFWH

H9=762.81

Feedwater at pump outlet (pump after OFWH)

H10=784.23

Steam condensate from CFWH

H11=1154.23

Additional data

Feedwater from CFWH with TD=4 deg C applied (actual case)

H8' =1134.32 KJ/kg

Use the following data for your calculations:

1. Equipment and TS diagram of the cycle
2. Ideal ngine efficiency (%) Answer:___________________
3.Thermal efficiency of the actual cycle (%)using turbine and pump work values. Answer: _________________
4. Thermal efficiency of the actual cycle (%)using Qa and Qr values. Answer: _________________
5. Combined Steam rate (kg/kw-hr)
6. Torque produced in KN-m at the shaft connecting the generator to the turbine if brake engine efficiency = 93% and generator rpm = 15 rev per sec Answer:_______________________
7. If Cp water = 4.187 KJ/kg-K; cooling water enters the condenser at 10 deg C and leaves at 22 deg C, find amount of cooling water needed by the condenser in kg/sec. (Ideal cycle) Answer: _________________________

Comment if still missing and comment what is missing given.

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A thumbs up, pls!!

samet mamat answered 2 years ago
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