EGN_3358_Notes_Ch4_First and second laws-Part 1

EGN_3358_Notes_Ch4_First and second laws-Part 1 - EGN 3358...

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Unformatted text preview: EGN 3358 Thermo-Fluids-Heat Transfer Lecture 6: Systems analysis First and Second Laws of Thermodynamics Chapter 4 - Part 1 Empirical Observations concerning Energy Transformations A cup of hot coffee left in a cooler room. Two tanks at different levels Heating of a room by passing a current through an electric resistor. Conversion of heat input into a work output. Statements of Second Law Clausius Statement Kelvin-Planck Statement Clausius Statement: It is impossible to construct a device that operates in a cycle and produces no effect other than the transfer of heat from a lower- temperature body to a higher temperature body. Related to refrigerators or heat pumps Thermal Reservoir A special kind of closed system from which any finite amount of heat may be removed without changing its temperature, or to which any finite amount of heat may be added without changing its temperature Oceans, lakes, rivers, atmosphere Kelvin-Planck Statement It is impossible for any device that operates on a cycle to receive heat from a single reservoir and produce a net amount of work. That is, a heat engine must exchange heat with a low- temperature sink as well as a high-temperature source to keep operating. No heat engine can have an efficiency of 100%. Reversible Processes Idealized Process A process that can be reversed without having any trace on the surroundings. Is this possible?...
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EGN_3358_Notes_Ch4_First and second laws-Part 1 - EGN 3358...

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