Heat flows from a hot or warm medium to a cold medium in three ways:
- By radiation, from a warm surface to a cooler surface through an air space
- By conduction through solid or fluid materials
- By convection, which involves the physical movement of air
Heat Flow by Radiation, Conduction and Convection
Radiation is the transfer of heat (infra-red radiant energy) from a hot surface to a cold surface across an air space or vacuum. All surfaces including those of a radiator, stove, a ceiling or roof and insulation radiate to different degrees. The radiant heat is invisible and has no temperature, just energy. When this energy strikes another surface, it is absorbed and increases the temperature of that surface. This concept can be understood with the following example: On a bright sunny day, radiant heat from the sun travels through a car’s window, strikes the steering wheel and is absorbed, causing it to become hot.
Conduction is the direct flow of heat through a material resulting from physical contact. A typical example of conduction would be the heat transferred from hot coffee, through the cup, to the hand holding the cup. Another example is when the contents of a kettle boils from heat transferred from the burner to the kettle. Also, a poker becomes hot from contact with hot coals.
Convection is the transfer of heat by air circulation or movement. Typical examples are forced convection: warm air rising from a heat register, free convection: warm air rising from a chimney, and finally, warm air rising from all of the hot surfaces of a radiator, furnace or wood stove.
Reflective Insulation & Radiant Barriers
Reflective insulation and radiant barriers have the ability to control the transfer of radiant heat in a variety of different applications including buildings, RVs and temperature-sensitive packaging.
Unlike mass insulation, reflective insulation is able to keep heat in and reflect heat away. Mass insulation material like fiberglass and foam merely slow down the transfer of heat; they do not reflect heat away, nor do they keep heat in.
Reflective insulation has the ability to control the transfer of radiant heat. In fact, Innovative Energy’s products reflect (block) 95 percent of radiant heat. Our products are ideal for:
- Buildings & home insulation: Heating and cooling systems simply work more efficiently when reflective insulation is installed in key areas of a building.
- Temperature-sensitive packaging: Keeps perishable and temperature-sensitive items safe in shipping and transportation; helps maintain food safety and quality for prepared food.
- Insulation for RVs and fleet vans: Thin, light, reflective insulation and duct systems are ideal for efficiently heating and cooling small spaces.
- Controlling heat transfer in just about any situation: Innovative Energy specializes in creating customized solutions for all types of applications.
Reflective Insulation Products
Among Innovative Energy’s line of reflective insulation products is AstroShield. Watch video below to learn how this reflective insulation product can block up to 95 percent of radiant heat.