SecondLaw - ME 201 Thermodynamics Second Law Guide The...

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1 ME 201 Thermodynamics Second Law Guide The second law of thermodynamics really consists of a number of statements that one might consider rules of reality that help explain physical observations that are not explained by the conservation of mass or conservation of energy principles. These rules of reality will help us in the following ways: 1. determining the final equilibrium state for a spontaneous process 2. providing a means of measuring the quality of energy 3. determining the reality of a process or device 4. determining the direction of change for a process 5. providing a criteria for ideal performance of a device. Heat Engines, Heat Pumps, and Refrigerators Devices that operate on a cycle (a series of processes that eventually return the system to its initial state) are one of three types as summarized below. Device Purpose Performance Criteria Heat Engine Produce Work Thermal Efficiency, q w = Q W = Q W = H net H net H net th η Heat Pump Supply Heat to a Body Coefficient of Performance,
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SecondLaw - ME 201 Thermodynamics Second Law Guide The...

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