PHY 182 1st Edition Lecture 10 Outline of Last Lecture - Thermal Interactions and Heat Engines- 2nd Law of Thermodynamics- EntropyOutline of Current Lecture - Otto Cycle and Stirling Engine- Refrigerators- Carnot CycleCurrent LectureOtto Cycle and Stirling Engine- An Otto Cycle includes 4 steps. The first step is known as the compression stroke, which is an adiabatic process that does negative work. The second step ignites the fuel; this step is an isochoric process. The third step is known as the power stroke, which is an adiabatic process that does positive work. The fourth and final step rejects the heat to cool the engine through an isochoric process.- The efficiency of a four-stroke engine is dependent on the heat it takes in and the heat exhausted.- Many scientists and engineers have attempted to use a Stirling Engine to power larger machinery because of its simplicity and efficiency.- A Stirling Engine requires just one thing to run: temperature difference.Refrigerators- A refrigerator is essentially a heat engine in reverse.These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- Work and Qc are taken in to reduce the temperature. QH is given off. (A heat engine works the opposite, producing work instead of QH).- Naturally, heat will always flow from a hotter object to a colder object. The only way thatheat can flow cold to hot is if you do work.Carnot Cycle- A Carnot engine is often referred to a hypothetical, ideal, or perfect heat engine.- A Carnot engine shows how efficient a heat engine can be. The efficiency of a heat engine can never be more than the Carnot efficiency.- This Carnot efficiency (maximum efficiency for a heat engine) is dependent only on the difference between temperatures of the hot and cold reservoirs.- A larger temperature difference equates to a better
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