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10. The enthalpy of the water entering an actual pump is 500 kJ/kg and the enthalpy...
A pump operates adiabatically with liquid water entering at T1 25 °C P, = 1 bar with a mass flow ...
A pump operates adiabatically with liquid water entering at T1 25 °C P, = 1 bar with a mass flow rate of 100 kg/s. The exhaust pressure is 20 bar and the pump efficiency is 0.75 (i) Determine the actual power requirement of the pump and the temperature of the discharged water 7 marks) (İİ) What is the rate of entropy generation of the adiabatic irreversible process?
A pump operates adiabatically with liquid water entering at T1 25 °C P,...
Gas enters an adiabatic turbine with enthalpy 3456 kJ/kg and velocity 100 m/s. It leaves the...
Gas enters an adiabatic turbine with enthalpy 3456 kJ/kg and velocity 100 m/s. It leaves the turbine with enthalpy 2675 kJ/kg and velocity 200 m/s. Had the flow been isentropic, the enthalpy would be 2315 k./kg at exit. Assume (V2s-V2). Determine the following: QUESTION 2 Total enthalpy at inlet in kJ/kg Enthalpy at exit in kJ/kg A 2392 B. 2695 C. 2461 D. 2335 Total isentropic enthalpy at exit in kJ/kg Total-to-total efficiency (%) The work done (in kJ/kg) E766...
A pump is pumping water at a flow rate of 1200 litres per minute. In the...
A pump is pumping water at a flow rate of 1200 litres per minute. In the pump the mechanical energy of the water increases by 250 J/kg. The density of water is 1000 kg/m3. a) Determine the pressure difference between the pump outlet and the pump inlet. Assumptions: there are no frictional losses in the pump, and differences in velocity and elevation between inlet and outlet of the pump can be neglected. b) Show that the mechanical power added to...
Question 18 (10 April 2020) 51.5 kW 12 cm Pump An oil pump is drawing 51.5...
Question 18 (10 April 2020) 51.5 kW 12 cm Pump An oil pump is drawing 51.5 kW of electric power while pumping oil with p= 860 kg/m3 at a rate of 0.23 m3/s. The inlet and outlet diameters of the piper are 8 cm and 12 cm, respectively. If the pressure rise of oil in the pump is measured to be 500 kPa and the motor efficiency is 87.5 percent, determine the mechanical efficiency of the pump. Motor 8 cm...
2 Underground water is to be pumped by a 80 percent efficient 10-kW submerged pump to a pool whose free surface is X m above the underground water level (see Figure 2). The diameter of the pipe is 10...
2 Underground water is to be pumped by a 80 percent efficient 10-kW submerged pump to a pool whose free surface is X m above the underground water level (see Figure 2). The diameter of the pipe is 10 cm on the intake side and 8 cm on the discharge side. Determine (a) the maximum flow rate of water and (b) the pressure difference across the pump. Assume the elevation difference between the pump inlet and the outlet and the...
A simple Rankine cycle uses water as the working fluid. The boiler operates at 6000 kPa...
A simple Rankine cycle uses water as the working fluid. The boiler operates at 6000 kPa and the condenser at 40 kPa. At the entrance to the turbine, the temperature is 380 °C. The isentropic efficiency of the turbine is 88 %, pressure and pump losses are negligible, and the water leaving the condenser is subcooled by 5.9 °C. The boiler is sized for a mass flow rate of 17 kg/s. Determine the following values. °C m®/kg 1 kJ/kg (1)...
9-1 The above office requires 2,000,000 BTUH heating for exterior zones. A hot water heating system with a circulating pump is used for water circulation. Assume Heating coils have inlet temp 180 F o...
9-1 The above office requires 2,000,000 BTUH heating for exterior zones. A hot water heating system with a circulating pump is used for water circulation. Assume Heating coils have inlet temp 180 F outlet temp 140", and pump head is 30 FT. Answer the following questions: (3 points) (a) The required total hot water flow rate in GPM (b) BHP if the pump selected has an efficiency of 50% (c) what is the water main pipe size
9-1 The above...
Problems 3 (70 points) A simple Rankine power cycle has been powered by 2500 meters each...
Problems 3 (70 points) A simple Rankine power cycle has been powered by 2500 meters each for 10 hours per day on year 138.3, 158.3, 3809.0 and 2073.8 (in kJ/kg) at the beginning process, at the turbine inlet and at the outlet respectively. 1 generator efficiency is 98%, A tota panels. The solar collectors are 50% efficient. The second law of the 85%. solar thermal panels of 10 square erage per year. Enthalpy at the stages of the cycle are...
Water enters the pump of a real Rankine cycle at 10 psia and 100°F The pump increases the pressur...
Answer: Thermal efficiency = 22%
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Water enters the pump of a real Rankine cycle at 10 psia and 100°F The pump increases the pressure to 1076 psia and has an efficiency of 75%. Friction and heat loss in the pipes to the boiler reduce the pressure and temperature to 985 psia and 95°F at the entrance to the boiler. The boiler heats the water to 915°F while friction in the boiler reduces the pressure to 963 psia....
A pump draws water from a well through a 153mm vertical tube. The pump has a...
A pump draws water from a well through a 153mm vertical tube. The pump has a horizontal discharge tube of 102mm in diameter, which is 3.23m above the water level in the well. While the flow rate is 0.035m³ / s, pressure gauges near the pump at the inlet and outlet indicate -31.44Kpa and 176.51Kpa respectively. The discharge indicator is 1.91 m above the suction indicator. Determine the power supplied by the pump. Use for the questions below g =...
A pump operates adiabatically with liquid water entering at T1 25 °C P, = 1 bar with a mass flow rate of 100 kg/s. The exhaust pressure is 20 bar and the pump efficiency is 0.75 (i) Determine the actual power requirement of the pump and the temperature of the discharged water 7 marks) (İİ) What is the rate of entropy generation of the adiabatic irreversible process?
A pump operates adiabatically with liquid water entering at T1 25 °C P,...
Gas enters an adiabatic turbine with enthalpy 3456 kJ/kg and velocity 100 m/s. It leaves the turbine with enthalpy 2675 kJ/kg and velocity 200 m/s. Had the flow been isentropic, the enthalpy would be 2315 k./kg at exit. Assume (V2s-V2). Determine the following: QUESTION 2 Total enthalpy at inlet in kJ/kg Enthalpy at exit in kJ/kg A 2392 B. 2695 C. 2461 D. 2335 Total isentropic enthalpy at exit in kJ/kg Total-to-total efficiency (%) The work done (in kJ/kg) E766...
Question 18 (10 April 2020) 51.5 kW 12 cm Pump An oil pump is drawing 51.5 kW of electric power while pumping oil with p= 860 kg/m3 at a rate of 0.23 m3/s. The inlet and outlet diameters of the piper are 8 cm and 12 cm, respectively. If the pressure rise of oil in the pump is measured to be 500 kPa and the motor efficiency is 87.5 percent, determine the mechanical efficiency of the pump. Motor 8 cm...
2 Underground water is to be pumped by a 80 percent efficient 10-kW submerged pump to a pool whose free surface is X m above the underground water level (see Figure 2). The diameter of the pipe is 10 cm on the intake side and 8 cm on the discharge side. Determine (a) the maximum flow rate of water and (b) the pressure difference across the pump. Assume the elevation difference between the pump inlet and the outlet and the...
A simple Rankine cycle uses water as the working fluid. The boiler operates at 6000 kPa and the condenser at 40 kPa. At the entrance to the turbine, the temperature is 380 °C. The isentropic efficiency of the turbine is 88 %, pressure and pump losses are negligible, and the water leaving the condenser is subcooled by 5.9 °C. The boiler is sized for a mass flow rate of 17 kg/s. Determine the following values. °C m®/kg 1 kJ/kg (1)...
9-1 The above office requires 2,000,000 BTUH heating for exterior zones. A hot water heating system with a circulating pump is used for water circulation. Assume Heating coils have inlet temp 180 F outlet temp 140", and pump head is 30 FT. Answer the following questions: (3 points) (a) The required total hot water flow rate in GPM (b) BHP if the pump selected has an efficiency of 50% (c) what is the water main pipe size
9-1 The above...
Problems 3 (70 points) A simple Rankine power cycle has been powered by 2500 meters each for 10 hours per day on year 138.3, 158.3, 3809.0 and 2073.8 (in kJ/kg) at the beginning process, at the turbine inlet and at the outlet respectively. 1 generator efficiency is 98%, A tota panels. The solar collectors are 50% efficient. The second law of the 85%. solar thermal panels of 10 square erage per year. Enthalpy at the stages of the cycle are...
Answer: Thermal efficiency = 22%
Show all labels/work.
Water enters the pump of a real Rankine cycle at 10 psia and 100°F The pump increases the pressure to 1076 psia and has an efficiency of 75%. Friction and heat loss in the pipes to the boiler reduce the pressure and temperature to 985 psia and 95°F at the entrance to the boiler. The boiler heats the water to 915°F while friction in the boiler reduces the pressure to 963 psia....
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