308800 Chapter 5: Chapter 5 Energy Equation for a Control Mass.pdf

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Chapter 5: energy equation for a control mass. First law of thermodynamics: conservation of energy law. This chapter looks at the energy balance of a system. The first law of thermodynamics for a control mass undergoing a cycle. First law of thermodynamics states that during any cycle a system undergoes, the cyclic integral of heat is proportional to cyclic integral of work. If e is the energy of the system, for a constant mass: E = internal energy (u) + kinetic energy (ke) + potential energy (pe) Potential energy: where v is equal to velocity. Which gives: when there is no change in kinetic or potential energy which simplifies down to. Internal energy (u): extensive property, depends on mass of system. Can also be an intensive property (specific internal energy, u) which shows internal energy per unit of mass. Internal energy may be used as an independent property for specifying the state of a pure substance.

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