lessontext.doc - Figure 1 Equipment for Heat Transfer...

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Heat Transfer: Radiation Heat transfer occurs by three mechanisms: conduction, convection, and radiation. We have discussed conduction in the past two lessons. In this lesson, we will discuss radiation. We will start by looking again at the electromagnetic spectrum. Objectives [At the end of this lesson students will be able to...] describe the concept of radiation heat transfer and the equation governing this process. explain how this concept can be applied in our daily life and in space technologies. Start-up questions 1. How does heat (or energy) come to us from the sun? 2. What is in the space between planet earth and the sun? 3. Do all bodies produce heat? 4. Do you know how night vision goggles work? ______________________________________________________________________________ Heat Transfer: Radiation -- Page 1 of 7 Figure 1: Equipment for Heat Transfer: Radiation black metal sheet white metal sheet E glass normal glass heat lamp (halogen light) with stand normal lamp (regular lightbulb) propane torch temperature probes or thermocouple
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Thermal Energy Transfer: Radiation Radiative heat transfer is the only way to transfer heat from one place to another that does not require a medium. Let's look again at the electromagnetic radiation spectrum and the various aspects and applications of radiation. Notice the relative energies of photons in the radio/TV, microwave, IR (infrared, heat), optical (visible), UV (ultraviolet), x-ray, and gamma ray bands. We will demonstrate the transmission of infrared radiation (heat) through different glasses using a light meter and two sources of light (normal and heat lamp) by feel and thermocouple. Comparison of transmission through different glasses Light meter reading without glass: Temperature reading without glass: Visible Light (visual and light meter) IR (heat) (feel and thermocouple) Normal glass E glass (energy efficient) Stain glass Dark double glass Let's describe the basic concept of energy (or heat) transfer by radiation. We will develop the basic equation for radiative heat transfer, Stefan's law. First, some definitions: Radiation is the energy emitted from a surface as particles or waves. The rate of radiative emission per unit time and per unit surface area , or
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