A hot process stream is cooled by indirect heat exchange with feedwater to a boiler, thereby producing saturated steam. Assume that the heat exchanger is isolated. The liquid feed water to the boiler enters at 50 °C, and leaves as saturated steam at 10000 kPa. The flow of the process stream is 1000 kmol/h, the molar enthalpy at the input is 2000 kJ/kmol, and the output enthalpy is 800 kJ/kmol. Calculate a) the flow rate (kg/h) of steam produced. b) If we had to produce water vapor by burning fuel, find its savings (gallons/h), if the heating power of the fuel is 144,000 Btu/gal. Note: make a table of degrees of freedom. Neglect changes in kinetic and potential energy. Data: Boiler feed water enthalpy Ĥ (kJ/kg) ≈ 4.19 T(°C):
A hot process stream is cooled by indirect heat exchange with feedwater to a boiler, thereby producing saturated steam. Assume that the heat exchanger is isolated. The liquid feed water to the boiler enters at 50 °C, and leaves as saturated steam at 10000 kPa. The flow of the process stream is 1000 kmol/h, the molar enthalpy at the input is 2000 kJ/kmol, and the output enthalpy is 800 kJ/kmol. Calculate a) the flow rate (kg/h) of steam produced. b) If we had to produce water vapor by burning fuel, find its savings (gallons/h), if the heating power of the fuel is 144,000 Btu/gal. Note: make a table of degrees of freedom. Neglect changes in kinetic and potential energy. Data: Boiler feed water enthalpy Ĥ (kJ/kg) ≈ 4.19 T(°C):
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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A hot process stream is cooled by indirect heat exchange with feedwater to a boiler, thereby producing saturated steam. Assume that the heat exchanger is isolated. The liquid feed water to the boiler enters at 50 °C, and leaves as saturated steam at 10000 kPa. The flow of the process stream is 1000 kmol/h, the molar enthalpy at the input is 2000 kJ/kmol, and the output enthalpy is 800 kJ/kmol. Calculate a) the flow rate (kg/h) of steam produced. b) If we had to produce water vapor by burning fuel, find its savings (gallons/h), if the heating power of the fuel is 144,000 Btu/gal. Note: make a table of degrees of freedom. Neglect changes in kinetic and potential energy.
Data: Boiler feed water enthalpy Ĥ (kJ/kg) ≈ 4.19 T(°C):
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