Microsoft PowerPoint - INTRODUCTION TO HEAT TRANSFER

Microsoft PowerPoint - INTRODUCTION TO HEAT TRANSFER -...

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Unformatted text preview: INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION TO HEAT TO HEAT TO HEAT TO HEAT TO HEAT TO HEAT TO HEAT TO HEAT TRANSFER TRANSFER TRANSFER TRANSFER TRANSFER TRANSFER TRANSFER TRANSFER Course By : Prof. Course By : Prof. Mohajer Mohajer prepared by: S.M. prepared by: S.M. rafigh rafigh 2011 2011 Molecules and Motion • The motion of molecules produces heat he more motion, the • The more motion, the more heat is generated Heat Transfer • The movement of heat from a warmer object to colder one a colder one Forms of heat transfer • Three forms of heat transfer: onduction • Conduction • Convection • Radiation Conduction • Conduction involves the transfer of heat through irect contact direct contact • Heat conductors conduct heat well, insulators do not Convection • Takes place in liquids and gases as molecules move in currents • Heat rises and cold settles to the bottom Radiation • Heat is transferred through space • Energy from the sun being transferred to the Earth Questions • What are the three types of heat transfer? ow is conduction different from • How is conduction different from radiation? What type of heat transfer is involved? • Heating a room with a fireplace • Egg cooking in a frying pan • Roof of a house becoming hot What type of heat transfer? • Warm air mass bringing a change in the weather ire getting hot from an • Wire getting hot from an electric appliance Temperature and Heat • Kinetic energy is the energy of motion emperature is the • Temperature is the measure of the average kinetic energy of an object Question • How is kinetic energy related to heat roduction? production? Thermometer • A instrument used to measure temperature • Thermometers commonly have lcohol (with dye) or mercury alcohol (with dye) or mercury • Digital thermometers have replaced older ones Celsius Scale • Celsius is the metric scale for measuring mperature temperature • Water freezes at 0 º C and boils at 100ºC Kelvin scale • The Kelvin scale is a metric temperature scale measured in Kelvin units (K) • Formula (273+ºC)= Kelvin Questions • What is the formula for converting a...
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Microsoft PowerPoint - INTRODUCTION TO HEAT TRANSFER -...

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