ACADs (08-006) Covered Keywords Heat tracing, thermal radiation, black body, gray body. Description Supporting Material 1.3.6.25.3.2.8.

Slides:

Advertisements

Similar presentations

Advertisements

RADIO WAVES, MICROWAVES, INFRARED, VISIBLE, ULTRAVIOLET, X-RAYS, GAMMA RAYS HIGH< wavelength LOW.

8 TH GRADE SCIENCE LEAP Assessment PowerPoint Practice.

1.2 Transfer Processes Conduction Convection

Mathematical Models for Modes of Heat Action P M V Subbarao Professor Mechanical Engineering Department Tools to select Means of Heat Interactions between.

Introduction to Astrophysics Lecture 3: Light. Properties of light Light propagates as a wave, and corresponds to oscillations of electric and magnetic.

Woodstoves 1 Woodstoves and lightbulbs. Woodstoves 2 Introductory Question Which is more effective at heating a room: Which is more effective at heating.

Radiation Infra-red radiation transfers heat between all objects. Infra-red radiation is an electromagnetic wave and can travel through a vacuum. Heat.

Energy Ability to do work Many different forms Conservation of energy (Law) Transformed: example: – Radiant to Thermal – Kinetic to Thermal (friction)

Specific latent heat and radiation What is specific latent heat????? This is the energy absorbed or released when a substance changes state or phase.

Temperature, Heat & Expansion. Temperature - The quantity that tells how hot or cold something is compared with a standard. Temperature - The quantity.

CHE/ME 109 Heat Transfer in Electronics

Radiation Heat Transfer. The third method of heat transfer How does heat energy get from the Sun to the Earth? There are no particles between the Sun.

Chapter 13: Heat Transfer  In the previous chapter, we learned that heat can flow from one object to another (e.g., from the warmer to the cooler object)

Chapter 22 Heat Transfer.

© 2011 Autodesk Freely licensed for use by educational institutions. Reuse and changes require a note indicating that content has been modified from the.

MECHANISMS OF HEAT TRANSFER

CHAPTER 4 Heat and Temperature.

Chapter 18 Bose-Einstein Gases Blackbody Radiation 1.The energy loss of a hot body is attributable to the emission of electromagnetic waves from.

Heat is a form of:. Everything in the universe has heat energy! Your BODY, your CAR…even ICE!

Jeopardy Vocabulary 1 Vocabulary 2 EM Waves EM Spectrum Light & Color Q $100 Q $200 Q $300 Q $400 Q $500 Q $100 Q $200 Q $300 Q $400 Q $500 Final Jeopardy.

ENERGY 7.1. Chapter Seven: Energy  7.1 Energy and Systems  7.2 Conservation of Energy  7.3 Energy Transformations.

Get your boards ready…. Name one way you can distinguish one electromagnetic wave from another. Possible answers: Frequency, wavelength, energy produced.

Heat A Form of Energy Molecules and Motion The _____of molecules produces _____ The _____motion, the _____heat is generated.

Weather Part 1: Heating the Earth. Weather is… the daily condition of the Earth’s atmosphere. caused by the interaction of heat energy, air pressure,

Waves. Waves- Rhythmic disturbances that carry energy without carrying matter –Molecules bump each other and pass energy from molecule to molecule.

Climate Long time, Large Area. Weather short term, small area.

Photon Statistics Blackbody Radiation 1.The energy loss of a hot body is attributable to the emission of electromagnetic waves from the body. 2.The.

Effects of Electromagnetic Waves

Energy Types and Forms.  Write the Pendulum of Potential and Kinetic Energy in your notebook.

CBE 150A – Transport Spring Semester 2014 Radiation.

CHAPTER 12 RADIATION HEAT TRANSFER. Electromagnetic Radiation – electromagnetic waves (brought upon by accelerated charges or changing electric currents)

Warm Up 3/6/08 More solar energy reaches the equatorial regions than the polar regions because the equatorial regions a. are covered by a greater area.

Thermodynamics. Temperature  How hot or cold something feels compared to a standard  Typically water is our standard  Function of kinetic energy 

Introduction to Thermal Physics

Energy Kinetic Energy Potential Energy.

Introduction to Thermal Radiation and Radiation Heat Transfer.

What is a wave? Wave – a disturbance or oscillation that travels from one place to another.

Thermal Radiation Done By: Nujood Al-hashar Abrar Al-haddabi

L 18 Thermodynamics [3] Heat transfer Heat Capacity convection

HEAT TRANSFER Conduction, Convection and Radiation.

Radiation Heat Transfer

Radiation (Ch 12 YAC) Thermal energy is emitted by matter as a result of vibrational and rotational motion of molecules, atoms and electrons. The energy.

Transmission of Heat. Conduction of heat Takes place within certain materials and from one of these materials to another when they are in direct contact.

NATS 101 Section 13: Lecture 5 Radiation. What causes your hand to feel warm when you place it near the pot? NOT conduction or convection. Why? Therefore,

Warm-Up What would happen if there was no more ozone? What would happen if there was no more ozone? –We would die. What are the four layers of the atmosphere?

Thermal Energy Question Review

W1 & W2 Notes. W1 Waves Waves are a method that many types of energy use to move from one place to another. In other words, a wave is moving energy. A.

CHAPTER 6 THERMAL ENERGY. PS 7 a-c 1. I can illustrate and explain the addition and subtraction of heat on the motion of molecules. 2. I can distinguish.

4/21/16 4/22/16 In todays lecture there are 7 questions You will answer the 7 questions on a piece of paper. I will collect at the end of the period for.

Explain & Draw each of the following Transparent, translucent, opaque Electromagnetic spectrum Conduction, convection, radiation Open & closed circuit.

Heat Energy. What is Heat Energy? Heat Energy Heat Energy is the sum total of all of the energy of the particles of an object. Heat energytemperature.

Explain & Draw each of the following Transparent, translucent, opaque Electromagnetic spectrum Conduction, convection, radiation Series & parallel circuit.

Wave Basics. Wave Definition  Any traveling disturbance that transfers energy. WAVES DON’T MOVE MATTER!!!

* Materials that allow heat, electricity, or sound waves to pass through them.

The Electromagnetic Spectrum Scripps Classroom Connection

Electromagnetic Waves

NURADIBAH BINTI MOHD AMER

Thermal Energy On The Move

Thermal radiation.

Thermal Energy Heat.

Radiation Thermal energy emitted by matter as a result of vibrational and rotational movements of molecules, atoms and electrons. The energy is transported.

Jeopardy! Day 11: 5/5/11 Objective: I will score an 80% or better on my test tomorrow.

(EMR) Electromagnetic Radiation

L 18 Thermodynamics [3] Heat transfer Heat Capacity convection

Energy that is made up small particles, called atoms & molecules; the faster the movement of particles the warmer it becomes; this is what kind of energy?

Radiation Thermal energy emitted by matter as a result of vibrational and rotational movements of molecules, atoms and electrons. The energy is transported.

17.2 – Heating the atmosphere – Part I

Radiation Heat Transfer

Presentation transcript:

ACADs (08-006) Covered Keywords Heat tracing, thermal radiation, black body, gray body. Description Supporting Material

Lesson 14 Radiant Heat Transfer DESCRIBE how the following terms relate to radiant heat transfer: a. Black body radiation b. Emissivity c. Radiation configuration factor

Thermal Radiation The transfer of heat by electromagnetic radiation that arises due to the temperature of a body. Most in the infra-red region of the electromagnetic spectrum Distinguished from other forms of radiation, such as radio waves, x-rays, or gamma rays. Does not need a medium, such as air or metal, to take place. Any material that has a temperature above absolute zero gives off some radiant energy. Examples: – When a cloud covers the sun, both its heat and light diminish. – The transfer of heat from a fireplace across a room in the line of sight.

Black Body Radiation A body that emits the maximum amount of heat for its absolute temperature Can be expressed by the following equation:

Net flow rate of heat between two black bodies

Emissivity A factor by which we multiply the black body heat transfer to take into account that the black body is the ideal case Emissivity is a dimensionless number and has a maximum value of 1.0. Modified formula for emissivity:

Radiation Configuration Factor Radiative heat transfer rate between two gray bodies can be calculated by the equation stated below.

Radiation Configuration Factor (cont.) A simplified version is obtained by combining f a and f e giving the Radiation Configuration Factor (f):

Resistive Electrical Heating Electrical Heaters Heat Tracing

Electric Heaters

Heat Tracing Used on mechanical piping systems that carry borated water, caustic soda, and other solutions Performs critical process temperature control Also applied on water piping systems to prevent them from freezing in cold weather Application must include – Identification of requirements – Heater design considerations – Power systems design considerations – Temperature control considerations – Alarm considerations – Finished drawings and documents – Installation of materials – Startup testing – Temperature tests – Maintenance of electric pipe heating systems