"The Efficiency of Heat Engines" Utilization of Internal Energy PPT Courseware

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"The Efficiency of Heat Engines" Utilization of Internal Energy PPT Courseware

Definition and classification of internal combustion engines.

The four strokes of an internal combustion engine and how the energy in each stroke is converted.

What do you think is the heat loss during the four strokes?

Type of fuel

Common fuels include coal, petroleum (processed and refined into gasoline, kerosene, diesel and liquefied gas, etc.), natural gas, etc. In rural areas, straw from vegetation and other plants is also used as fuel.

calorific value of fuel

Do different fuels of equal mass release the same amount of heat when burned?

Different fuels of equal mass release different amounts of heat when completely burned.

In physics, the ratio of the heat released when a certain fuel is completely burned to its mass is called the calorific value of the fuel.

Heat engine efficiency

Discussion and exchange: When a heat engine is working, can all the chemical energy contained in the fuel be used to do useful work for the outside world?

How to improve the efficiency of heat engines?

Make the fuel fully burn;

Minimize various heat losses;

Adopt advanced technology in the design and manufacturing of heat engines;

Pay attention to maintenance to ensure good lubrication and reduce additional energy consumption due to overcoming friction resistance.

In-person test feedback

1. The average monthly consumption of a family of four using different types of fuel separately is: about 200 kilograms of firewood, about 80 kilograms of bituminous coal, about 30 kilograms of liquefied petroleum gas, and about 60 kilograms of coal gas. Among these four fuels, the one with the highest calorific value is ( )

A. Liquefied petroleum gas B. Coal gas

C. Bituminous coal D. Firewood

2. Rockets in the aerospace industry use liquid hydrogen as fuel. This is because liquid hydrogen has ( )

A. Smaller mass B. Smaller density

C. Larger specific heat capacity D. Larger calorific value

3. Diesel engines are commonly used heat engines in industrial and agricultural production. It is known that the efficiency of a certain model of diesel engine is 30%. Complete combustion of 2 kilograms of diesel in the diesel engine can release heat _______J. This heat can be converted by the diesel engine to do useful work for the outside world _______J . (The calorific value of diesel is 3.3×107J/kg

4. How much heat can be released by completely burning 140 grams of coke (the calorific value of coke is 3.0×107J/kg)? If 30% of this heat is absorbed by water, how high can the temperature of 30kg, 20℃ water rise?

Dangers of acid rain

1. Direct harm to human health. Sulfuric acid mist and sulfate salt mist are much more toxic than sulfur dioxide and can invade the deep tissues of the lungs, causing pulmonary edema and other diseases that can lead to death.

2. Cause water acidification in rivers and lakes, seriously affecting the growth of aquatic animals and plants.

3. Destroy soil, vegetation and forests.

4. Corrodes metal, paint, leather, textiles and building materials.

5. Penetrate into the ground, making the content of aluminum, copper, zinc, and cadmium in the water many times higher than that in neutral groundwater.

How to protect our environment?

1. Improve combustion equipment and install smoke and dust removal devices;

2. Central heating;

3. Switch to gas fuel and popularize coal gas and natural gas;

4. Fully develop and utilize new energy sources with less pollution and no pollution.

after class homework:

The rocket fuel used to launch satellites must be small in size and light in weight, but must emit large amounts of heat, so that the weight of the rocket can be reduced and the satellite can be quickly put into orbit. Liquid fuel releases a lot of energy and generates a lot of thrust; it is easier to control and has a longer burning time. Therefore, most rockets that launch satellites use liquid fuel.

Keywords: Utilization of Internal Energy Teaching Courseware, Efficiency of Heat Engine Teaching Courseware, New People's Education Edition Ninth Grade Physics PPT Courseware, Ninth Grade Physics Slide Courseware Download, Utilization of Internal Energy PPT Courseware Download, Efficiency of Heat Engine PPT Courseware Download, .ppt format

For more information about the PPT courseware "Utilization of Internal Energy and the Efficiency of Heat Engines", please click on the Utilization of Internal Energy ppt Efficiency of Heat Engines ppt tag.

"The Efficiency of Heat Engines" Utilization of Internal Energy PPT Courseware 4:

"The Efficiency of Heat Engines" Utilization of Internal Energy PPT Courseware 4 1 What is a heat engine? 2. How many strokes does a gasoline engine generally have? What are they? 3. How many strokes in one cycle correspond to how many times of work is done? How many turns does the flywheel make? 4In the process of heat transfer, what is the amount of energy transferred called...

"The Efficiency of Heat Engines" Utilization of Internal Energy PPT Courseware 3:

"The Efficiency of Heat Engines" Utilization of Internal Energy PPT Courseware 3 Teaching Objectives: Master the definition and physical meaning of fuel calorific value. Understand the mechanical efficiency of heat engines. Learn to analyze heat loss and how to improve heat utilization. 1. Calorific value of fuel I would like to discuss. Boil a...

"The Efficiency of Heat Engines" Utilization of Internal Energy PPT Courseware 2:

"The Efficiency of Heat Engines" Utilization of Internal Energy PPT Courseware 2 1. Calorific Value of Fuel I would like to discuss whether different fuels have the same ability to release heat? How do we compare which one of them has the stronger ability to release heat? The combustion of fuel is a chemical reaction. During the combustion process, the chemicals stored in the fuel...

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Update Time: 2024-09-08

This template belongs to Physics courseware People's Education Edition Ninth Grade Physics Complete Book industry PPT template

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