1 / 31

Let ’ s Do Work!

This PowerPoint covers the curriculum listed below. Instructors please note this presentation has a corresponding handout. AGRICULTURE CORE CURRICULUM (CLF 2910) – WORK AND POWER. Let ’ s Do Work!. Pam Klittich AgEd 410 Fall 2013.

ashton-larsen
Download Presentation

Let ’ s Do Work!

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. This PowerPoint covers the curriculum listed below. Instructors please note this presentation has a corresponding handout.AGRICULTURE CORE CURRICULUM (CLF 2910) – WORK AND POWER • Let’s Do Work! Pam Klittich AgEd 410 Fall 2013

  2. Objectives: Upon completion of this lesson the student will be able to: Learning Outcome #: (S-1) - Define energy, force, pressure, friction, work, and power. (S-3) - Describe the concept efficiency of energy conversion and give examples of energy loss. (T-1) - Define linear motion and rotational motion. (T-2) - Explain the relationship of friction to the transmission of power

  3. Let’s Do Work! • Definitions & Concepts Pam Klittich AgEd 410 Fall 2013

  4. What is Horsepower? Power required to move 33,000lbs in one minute

  5. Specific application of energy to move something somewhere How is work measured? Terms of force and a distance moved What is Work?

  6. Capacity to do work Forms of energy include: Potential Kinetic Heat Force Electrical Embodied What is Energy?

  7. Energy which is not active, but is stored up Coiled spring Ball at the top of a hill Potential Energy

  8. Resulting from a body in motion Proportional to the mass of the body and velocity squared Noise energy - movement of air particles to produce sound Kinetic Energy

  9. Produced from friction or energy conversion Heat Energy

  10. Produces or alters movement of another mass Examples Force Energy

  11. Produced from movement of electrons through a conductor Electrical Energy

  12. Inherent property of the matter Fuel energy Chemical energy Embodied Energy

  13. Rate of doing work or expending energy How is Power measured? Terms of force, distance and time What is Power?

  14. Fluid Electrical Engine Types of Power

  15. High pressure hydraulic fluid to run motors, pressurize a hydraulic ram, etc Fluid

  16. Electrical outlets Generators Electrical

  17. Brake Horsepower Maximum power Stationary Units PTO Horsepower Measured at PTO Tractors and automobiles 10 to 15% less than engine horsepower Drawbar Horsepower Pulling power Dependent on: soil surface, type of tire (radial or bias ply), tire inflation pressure, tractor weighting, type of hitch Crawler or wheel tractors Engine

  18. Resistance to motion which is set up when two moving surfaces come in contact with each other Transmission Stopping Power generation Friction

  19. force per unit area; Units are pounds per square inch (psi) or pounds per square foot. In metric units it is kilopascals (1 psi = 6.895 kPa). Pressure

  20. Mechanical Volumetric Brake Thermal Efficiency Factors in Engines

  21. All factors that take horsepower away from an engine, including friction HP loss Examples? Mechanical Efficiency

  22. Limiting factors in an engine's maximum torque output The amount of air an engine can take into the cylinder is limited by things such as: the air cleaner and manifold temperature atmospheric pressure. Volumetric Efficiency

  23. Expressed as a percentage It takes into account all engine losses and can be used to compare heat energy of a fuel and the useable power it will produce Brake Thermal Efficiency

  24. Heat Mechanical Energy Losses

  25. The escape of heat in an engine and the heat loss from other bearings and parts in a machine contributes to a massive loss of fuel and an energy waste Heat Loss

  26. Mechanical Loss • Are due to operation of additional items which are necessary for the operation of the engine but which subtract from the total horsepower available for useful work • The following are some examples: • Fuel pump • Oil pump • Valves • Air conditioner compressor • Alternator or generator • Water pump • Cooling fan • Distributor • Hydraulic pump • Air blowers

  27. a twisting force applied about the center of rotation Torque

  28. Movement along a straight line Examples Linear Motion Linear and Rotary Motion Video <object width="560" height="315"><param name="movie" value="//www.youtube.com/v/i-Sob8tIvB4?hl=en_US&amp;version=3&amp;rel=0"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="//www.youtube.com/v/i-Sob8tIvB4?hl=en_US&amp;version=3&amp;rel=0" type="application/x-shockwave-flash" width="560" height="315" allowscriptaccess="always" allowfullscreen="true"></embed></object> Rotary Motion • the circular movement around a center pivot point

  29. Inertia The Three States of Matter Weight Other Power Terms

  30. Principles of Thermodynamics • The first law, also known as Law of Conservation of Energy, states that energy can not be created or destroyed; it can only be redistributed or changed from one form to another. • The second law of thermodynamics says that the entropy of any isolated system not in thermal equilibrium almost always increases. • The third law of thermodynamics states that the entropy of a system approaches a constant value as the temperature approaches zero. • Activity!

More Related