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 %. = 80%. Answer the following for 2.0 + SN/100 kg/sec of total steam circulated, and fill up the blanks with your answers in the items below: 1. Equipment and TS diagram of the cycle 2. Ideal mass of steam bled into the open heater = 3 Actual mass of steam bled into the open heater = 4. Actual engine efficiency (%) Answer: 5.Thermal efficiency of the ideal cycle (%) using Qa and Qr values. Answer: 6.Thermal efficiency of the actual cycle (%) using Wt and Wp (work) values. Answer. 7. Ideal Steam rate (kg/kw-br) Answer 8. 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 9. 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. 10. Actual Heat Rate (kJ/kw-br) Answer Use the following data for your calculations: Properties of H₂O Location Steam turbine entry Steam entry to reheater Steam from reheater to turbine Steam entry to CFWH from turbine Steam entry to OFWH from turbine Steam entry to condenser Feedwater/condensate from the condenser and at pump inlet Feedwater entry to OFWH Feedwater from OFWH Feedwater at pump outlet (pump after OFWH) Steam condensate from CFWH kg/kg. kg/kg Additional data Feedwater from CFWH with TD=4 deg C applied (actual case) H (KJ/Kg) (adiabatic efficiencies not applied) 3363.50 3155.40 3475.80 3250.13 2842.94 2215.05 251.13 252.13 762.81 784.23 1154.23 H=1134.32 KJ/kg

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 %. = 80%. Answer the following for 2.0 + SN/100 kg/sec of total steam circulated, and fill up the blanks with your answers in the items below: 1. Equipment and TS diagram of the cycle 2. Ideal mass of steam bled into the open heater = 3 Actual mass of steam bled into the open heater = 4. Actual engine efficiency (%) Answer: 5.Thermal efficiency of the ideal cycle (%) using Qa and Qr values. Answer: 6.Thermal efficiency of the actual cycle (%) using Wt and Wp (work) values. Answer. 7. Ideal Steam rate (kg/kw-br) Answer 8. 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 9. 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. 10. Actual Heat Rate (kJ/kw-br) Answer Use the following data for your calculations: Properties of H₂O Location Steam turbine entry Steam entry to reheater Steam from reheater to turbine Steam entry to CFWH from turbine Steam entry to OFWH from turbine Steam entry to condenser Feedwater/condensate from the condenser and at pump inlet Feedwater entry to OFWH Feedwater from OFWH Feedwater at pump outlet (pump after OFWH) Steam condensate from CFWH kg/kg. kg/kg Additional data Feedwater from CFWH with TD=4 deg C applied (actual case) H (KJ/Kg) (adiabatic efficiencies not applied) 3363.50 3155.40 3475.80 3250.13 2842.94 2215.05 251.13 252.13 762.81 784.23 1154.23 H=1134.32 KJ/kg

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

Chapter40: Typical Operating Conditions

Section: Chapter Questions

Problem 2RQ: The typical temperature relationship between a standard-efficiency air-cooled condenser and the...

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