1. Topic- 2. Content- 3. Objectives- 4. Procedures/Methods- Date: July 16, 2010 Teacher Name: Lalaine B. Bagui. Subject: Physics HEAT ENGINES

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1 Date: July 16, 2010 Teacher Name: Lalaine B. Bagui 1. Topic- Grade: Fourth year High School Subject: Physics HEAT ENGINES 2. Content- 1. Second Law of Thermodynamics 2. Heat Engines and how they work 3. Examples of Heat Engines 3. Objectives- 1.At the end of the lesson the students can explain in their own words how heat engines work. 2. Students will be able to give examples of heat engines. 3. Students can identify heat engine from other engines (e.g. heat pumps). 4. Students can calculate efficiency of heat engines. 4. Procedures/Methods- A. Introduction- Review on the Laws of thermodynamics. From the Second Law of Thermodynamics, introduce heat engines as one of its application. B. Development- Discussion of heat engines, how they work and the law behind it. Examples of heat engines will also be given. Heat engines transferr heat from hot reservoir to cold reservoir. It converts some of the thermal energy into work ` (Attribution- Share Alike)

govern the heat engine mechanism/process.

2 This diagram basically shows how heat engines work. During the discussion, it will be explained how the second law of thermodynamics govern the heat engine mechanism/process. Examples of Heat Engines Steam engine (Attribution) Diesel engine (Attribution- Share Alike) Drinking Birds (Attribution- Share Alike Stirling Engine (Public Domain)

3 Carnot Cycle Otto Cycle (Four Stroke Cycle) INTAKE stroke COMPRESSION stroke POWER stroke EXHAUST stroke Reversible isothermal expansion of the gas at the "hot" temperature, T H (isothermal heat addition). Isentropic (reversible adiabatic) expansion of the gas (isentropic work output). Reversible isothermal compression of the gas at the "cold" temperature, TC. (isothermal heat re- jection) Isentropic compression of the gas (isentropic work input). Heat Engine Efficiency - relates how much useful work is output for a given amount of heat energy input. (Note: Units K or R) Heat Pumps require work to transfer heat from cold reservoir to hot reservoir. Heat engine working in reverse. Diagram of a phase change heat pump (Public Domain) Heat pumps will not be thoroughly discussed. The purpose of including it in the lesson is for comparison purposes only. For clearer view of the difference of a heat engine from a heat pump, examples will be given during the lesson proper.

4 C. Practice- Students will conduct experiment from the prepared set-up about heat engines. D. Independent Practice- Problem solving related to calculating the efficiency of heat engines. F. Checking for understanding- Students will make a laboratory report about the experiment conducted. G. Closure- Students will be asked what they have learned from the experiment and what concepts or principles discussed during the lesson they have observed. 5. Evaluation- A quiz will be given (multiple choice and essay) to determine if the students really understand heat engines and how the laws of thermodynamics govern its mechanism. 6. References ator_set.jpg/800px-stm_stirling_generator_set.jpg License: This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Philippines License. To view a copy of this license, visit or send a letter to Creative Commons, 171 Second Street, Suite 300, San Francisco, California, 94105, USA.

6 Filename: heat engine lesson plan Directory: F: Template: Normal Title: Subject: Author: user Keywords: Comments: Creation Date: 7/23/2010 8:33:00 AM Change Number: 1 Last Saved On: 7/23/2010 6:36:00 PM Last Saved By: Lalaine Bagui Total Editing Time: 163 Minutes Last Printed On: 7/23/2010 7:21:00 PM As of Last Complete Printing Number of Pages: 5 Number of Words: 856 (approx.) Number of Characters: 4,883 (approx.)

Engineering Thermodynamics

Unit 61: Engineering Thermodynamics Unit code: D/601/1410 QCF level: 5 Credit value: 15 Aim This unit will extend learners knowledge of heat and work transfer. It will develop learners understanding of