TemperGuard-The Radiant Heat Transfer Solution!

January 15th, 2009


TemperGuard is a reflective barrier that inhibits heat transfer by thermal radiation. There are three types of heat transfer: Conductive, Convection and Radiation. Let’s explore all three.


Conductive heat transfer happens in solid matter. Conduction occurs when two object at different temperatures are in contact with each other. Heat flows from the warmer to the cooler object until they are both at the same temperature. Metals are very good conductors of heat, while air is very poor conductor of heat. You experience heat transfer by conduction whenever you touch something that is hotter or colder than your skin e.g. when you wash your hands in warm or cold water.


Convection heat transfer occurs in liquids or gasses. The warmer areas of a liquid or gas rise to cooler areas in the liquid or gas. As this happens, cooler liquid or gas takes the place of the warmer areas which have risen higher. An example of this is when you boil water in a pan. The bubbles of water that rise are the hotter parts of the water rising to the cooler area of water at the top of the pan. You have probably heard the expression “Hot air rises and cool air falls to take its place” - this is a description of convection in our atmosphere. Heat energy is transferred by the circulation of the air.


Both conduction and convection require matter to transfer heat. Radiation is a method of heat transfer that does not rely upon any contact between the heat source and the heated object. For example, we feel heat from the sun even though we are not touching it. Heat can be transmitted though empty space by thermal radiation. Thermal radiation (often called infrared radiation) is a type electromagnetic radiation (or light). Radiation is a form of energy transport consisting of electromagnetic waves traveling at the speed of light. No mass is exchanged and no medium is required.


All materials give off, or emit, energy by thermal radiation as a result of their temperature. The amount of energy radiated depends on the surface temperature and a property called the emissivity (also called the “emittance”). Emissivity is expressed as a number between zero (0) and one (1) at a given wavelength. The higher the emissivity, the greater the emitted radiation at that wavelength. Reflective technology requires the material to have a low emissivity (usually 0.1 or less) in order to function properly. The emissivity of TemperGuard is .03.


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