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1. A Rankine cycle works with a condenser pressure of 20kPa and a boiler pressure of 4000kPa. The water leaves the condenser saturated and is heated to 500°C in the boiler. The turbine works with an isentropic efficiency of 82% and has a work output of 35000kW. A natural-draft cooling tower is used to cool the water used to condense the steam in the condenser. Cooling water, enters the cooling tower at a temperature of 55°C and is required back in the condenser of the Rankine cycle at a temperature of 30°C. Air flow into the cooling tower. The design inlet air temperature and relative humidity is 25°C and 30% respectively. Under normal operating conditions the air flow is expected to leave the tower, with a temperature of 35°C at 70% saturation. Warm cooling water leaving the condenser and entering the cooling tower Turbine 6 Cold cooling water entering the condenser and leaving the cooling tower 7 Cold "dry' air entering the cooling tower 8 Hot wel' air leaving the cooling tower 9 Make-up water 1.1. Calculate the flow of steam in the Rankine cycle: m₁ %/ 1.2. Calculate the flow of cooling water through the condenser/cooling tower: mas */ Assume the mass flow of steam through the condenser mi = 3.5/ 1.3. Calculate the flow of air in the cooling tower. m. */ Assume the mass flow of cooling water through the tower mas = 75/ 1.4. Calculate the flow of make-up water needed: my*% Assume the mass flow of air through the tower m. = 90%/, Boiler

1. A Rankine cycle works with a condenser pressure of 20kPa and a boiler pressure of 4000kPa. The water leaves the condenser saturated and is heated to 500°C in the boiler. The turbine works with an isentropic efficiency of 82% and has a work output of 35000kW. A natural-draft cooling tower is used to cool the water used to condense the steam in the condenser. Cooling water, enters the cooling tower at a temperature of 55°C and is required back in the condenser of the Rankine cycle at a temperature of 30°C. Air flow into the cooling tower. The design inlet air temperature and relative humidity is 25°C and 30% respectively. Under normal operating conditions the air flow is expected to leave the tower, with a temperature of 35°C at 70% saturation. Warm cooling water leaving the condenser and entering the cooling tower Turbine 6 Cold cooling water entering the condenser and leaving the cooling tower 7 Cold "dry' air entering the cooling tower 8 Hot wel' air leaving the cooling tower 9 Make-up water 1.1. Calculate the flow of steam in the Rankine cycle: m₁ %/ 1.2. Calculate the flow of cooling water through the condenser/cooling tower: mas */ Assume the mass flow of steam through the condenser mi = 3.5/ 1.3. Calculate the flow of air in the cooling tower. m. */ Assume the mass flow of cooling water through the tower mas = 75/ 1.4. Calculate the flow of make-up water needed: my*% Assume the mass flow of air through the tower m. = 90%/, Boiler

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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1. A Rankine cycle works with a condenser pressure of 20kPa and a boiler pressure of 4000kPa. The water leaves the condenser saturated and is heated to 500°C in the boiler. The turbine works with an isentropic efficiency of 82% and has a work output of 35000kW. A natural-draft cooling tower is used to cool the water used to condense the steam in the condenser. Cooling water, enters the cooling tower at a temperature of 55°C and is required back in the condenser of the Rankine cycle at a temperature of 30°C. Air flow into the cooling tower. The design inlet air temperature and relative humidity is 25°C and 30% respectively. Under normal operating conditions the air flow is expected to leave the tower, with a temperature of 35°C at 70% saturation. 5 Warm cooling water leaving the condenser and entering the cooling tower Turbine 6 Cold cooling water entering the condenser and leaving the cooling tower Cold "dry air entering the cooling tower 7 8 Hot wet air leaving the cooling tower 9 Make-up water 1.1. Calculate the flow of steam in the Rankine cycle: mi *9/ 1.2. Calculate the flow of cooling water through the condenser/cooling tower: mas */. Assume the mass flow of steam through the condenser mi = 3.5/ 1.3. Calculate the flow of air in the cooling tower. ma Assume the mass flow of cooling water through the tower mws = 75/ 1.4. Calculate the flow of make-up water needed: my k Assume the mass flow of air through the tower m. = 90¹9/, Boiler
Transcribed Image Text:1. A Rankine cycle works with a condenser pressure of 20kPa and a boiler pressure of 4000kPa. The water leaves the condenser saturated and is heated to 500°C in the boiler. The turbine works with an isentropic efficiency of 82% and has a work output of 35000kW. A natural-draft cooling tower is used to cool the water used to condense the steam in the condenser. Cooling water, enters the cooling tower at a temperature of 55°C and is required back in the condenser of the Rankine cycle at a temperature of 30°C. Air flow into the cooling tower. The design inlet air temperature and relative humidity is 25°C and 30% respectively. Under normal operating conditions the air flow is expected to leave the tower, with a temperature of 35°C at 70% saturation. 5 Warm cooling water leaving the condenser and entering the cooling tower Turbine 6 Cold cooling water entering the condenser and leaving the cooling tower Cold "dry air entering the cooling tower 7 8 Hot wet air leaving the cooling tower 9 Make-up water 1.1. Calculate the flow of steam in the Rankine cycle: mi *9/ 1.2. Calculate the flow of cooling water through the condenser/cooling tower: mas */. Assume the mass flow of steam through the condenser mi = 3.5/ 1.3. Calculate the flow of air in the cooling tower. ma Assume the mass flow of cooling water through the tower mws = 75/ 1.4. Calculate the flow of make-up water needed: my k Assume the mass flow of air through the tower m. = 90¹9/, Boiler
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