General knowledge

Heat can transfer from one place to another by three ways: Conduction, Convection and Radiation. Both conduction and convection require media for heat to transfer. Where there is a temperature difference between 2 places heat will transfer from higher temperature location to lower temperature location.

 

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CONDUCTION happens when two objects are in contact with each other. Heat conduction occurs when an object is heated and atoms inside vibrate and interact with neighboring atoms by doing so they transfer some of the energy to the neighboring atoms. This phenomenon happens continuously and thermal energy is transferred from hotter end to cooler end. Materials with higher thermal conductivity will conduct heat faster. Metals, in general, are very good heat conductors.

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CONVECTION is a phenomenon when thermal energy is transferred from the hot areas to cold areas by convection. The medium (liquid or gas) near heat source gets hotter than other places, the temperature increases, the volume of gas/liquid expands and its density decreases causing it to rise. A liquid or gas volume nearby will move to offset the material that has moved up. This leads to a continuous circulation of gas/liquid. Boiling water in the kettle is an example of convection. Another example of convection is the atmosphere. The earth’s surface is heated by the sun, the warm air moves up, cool air descends forming convection currents.

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RADIATION is a phenomenon that does not rely on media between the heat source and other objects such as in the cases of conduction and convection. Heat can be transmitted through space via radiation, often infrared radiation, this is a type of electromagnetic radiation. Examples are thermal radiation of heat from the sun, or heat emitted from the filament of a bulb.

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Cattuong insulation products have ability to reduce heat transfer from all 3 different ways mentioned above. Firstly, the aluminium film reflects more than 99% of heat radiation, the air bubbles form compartments that prevent convection currents. In addition, air itself is a natural heat insulation material with thermal conductivity of only 0.025 (W/mK). Comparing to some common insulating materials such as glass wool, rock wool, XPS panels thermal conductivity around 0.03 to 0.07 (W/mK), air has a lower thermal conductivity and is the best insulation.

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With all these characteristics on the same product, Cattuong insulation products can create a heat barrier, have light weight, are easy to install and environmentally friendly. If installed correctly, our insulation can help reduce indoor temperature 10 – 20oC from outdoor temperature on a hot day.

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Finally, the figure below shows thermal conductivity of moist air. As can be seen thermal conductivity of moist air does not depend strongly on moisture content up to 40oC. Above 40oC moisture content increases the thermal conductivity actually decreases. So long as water does not condensate to become liquid water, it actually helps insulate even better. Cattuong’s products do not contain micro pores (like in many other insulation products) for water condensation thus they work perfectly well in all humid conditions.

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