AN INTRODUCTION TO THERMAL TECHNOLOGY FOUNDATIONS OF TECHNOLOGY

OBJECTIVES • Define terms related to thermal technology. • Explain the difference between heat

VOCABULARY • Conduction: the transfer of heat energy by direct contact. • Convection: the

VOCABULARY • Energy: the ability to do work. • Heat flow rate: The ratio

VOCABULARY • Thermal Energy: the total energy of random motion of vibration of all

THERMAL TECHNOLOGY • Thermal technology is the technology of producing, storing, controlling, transmitting, and

CONCEPTS REVIEW • The universe is made up of matter and energy. • The

CONCEPTS REVIEW • Many different types of energy can be converted to heat energy:

HEAT TRANSFER • Heat can be transferred by three methods: • Conduction in solids

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AN INTRODUCTION TO THERMAL TECHNOLOGY FOUNDATIONS OF TECHNOLOGY U N I T 3 8

OBJECTIVES • Define terms related to thermal technology. • Explain the difference between heat and thermal energy. • Explain the relationship between heat transferred to an object and the change in the object’s temperature. • Describe the heat transfer processes of conduction, convection, and radiation.

VOCABULARY • Conduction: the transfer of heat energy by direct contact. • Convection: the transfer of heat energy by moving a heated substance from one place to another. • Radiation: the transfer of heat by transforming heat energy into electromagnetic waves. • Thermodynamics: the study of thermal energy as it moves from one substance to another.

VOCABULARY • Energy: the ability to do work. • Heat flow rate: The ratio of the heat transferred to the time interval over which the transfer is measured. • Insulation: A layer of material with a high thermal resistance, used to reduce the heat transfer rate from a region. • Microwave: the movement of heat through a substance by the collision of molecules.

VOCABULARY • Thermal Energy: the total energy of random motion of vibration of all the particles that make up an object. • Thermal Resistance: A measure of the ability of an object to oppose the flow of heat through an object. • Heat: the energy transferred from one object to another because of temperature difference.

THERMAL TECHNOLOGY • Thermal technology is the technology of producing, storing, controlling, transmitting, and getting work from heat energy.

CONCEPTS REVIEW • The universe is made up of matter and energy. • The motion of atoms within matter creates a form of energy called heat. • Energy can take on many forms and can change from one form to another. • Put energy into a system and it heats up. Take energy away and it cools down.

CONCEPTS REVIEW • Many different types of energy can be converted to heat energy: • • Light Electrical Mechanical Chemical Nuclear Sound Thermal

HEAT TRANSFER • Heat can be transferred by three methods: • Conduction in solids • Convection in fluids (liquid and gas) • Radiation through anything that will allow radiation to pass.