Lecture_Notes_Part_2

Lecture_Notes_Part_2 - Energy Transfer by Heat Work and...

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ENME320 63 Energy Transfer by Heat, Work and Mass
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ENME320 64 • Heat: The form of energy that is transferred between two systems or a system and its surroundings as a result of a temperature difference. • Adiabatic Process: A process during which there is no heat transfer Q: How can we force a system to undergo an adiabatic process? Heat and Work Ans: System can be insulated or the system temperature can be set equal to its surroundings temperature
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ENME320 65 • Note: adiabatic and isothermal processes are two totally different processes • Heat is transferred by three mechanisms: conduction, convection, and radiation • Heat transfer per unit mass: • Heat transfer rate (kJ/s or kW) Heat and Work (Cont.) (kJ/kg) m Q q = Q & = 2 1 12 t t dt Q Q &
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ENME320 66 • Work: The form of energy transfer associated with a force acting through a distance If the energy crossing the boundary of a closed system is not heat, it must be work • Work per unit mass: Power is the time rate of doing work (kJ/s or kW) Heat and Work (Cont.) (kJ/kg) m W w = W & = 2 1 12 t t dt W W &
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This homework help was uploaded on 04/17/2008 for the course ENME 000 taught by Professor Staff during the Spring '08 term at Maryland.

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Lecture_Notes_Part_2 - Energy Transfer by Heat Work and...

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