Solution HW Ch 2

Solution HW Ch 2 - ME 113: THERMODYNAMICS Spring 2008 Ch 2...

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ME 113: THERMODYNAMICS Spring 2008 Ch 2 HW Solution
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Problem # 2-8 The specific kinetic energy of a mass whose velocity is given is to be determined. Analysis Substitution of the given data into the expression for the specific kinetic energy gives kJ/kg 0.45 = = = 2 2 2 2 /s m 1000 kJ/kg 1 2 ) m/s 30 ( 2 ke V Problem # 2-48E A water pump increases water pressure. The power input is to be determined. Analysis The power input is determined from hp 12.6 = - = - = Btu/s 0.7068 hp 1 ft psia 5.404 Btu 1 psia ) 10 50 )( /s ft 2 . 1 ( ) ( 3 3 1 2 P P W V The water temperature at the inlet does not have any significant effect on the required power. Problem # 2-51 The lighting energy consumption of a storage room is to be reduced by installing motion sensors. The amount of energy and money that will be saved as well as the simple payback period are to be determined. Assumptions
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Solution HW Ch 2 - ME 113: THERMODYNAMICS Spring 2008 Ch 2...

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