The thermal insulation principle of EPS (Expanded Polystyrene) sandwich panels is based on the ability of the EPS core to minimize heat transfer.
Here's how EPS Sandwich panels works:
1. Low Thermal Conductivity
EPS has a very low thermal conductivity due to its structure. It consists of numerous small, closed air-filled cells. Air is a poor conductor of heat, so the trapped air within these cells significantly reduces heat transfer through the material.
2. Minimizing Conduction
Heat transfer through conduction occurs when heat moves through materials. The foam structure of EPS, composed of 98% air and 2% polystyrene, reduces the amount of solid material through which heat can pass, thereby limiting conduction.
3. Reducing Convection
EPS sandwich panels also reduce heat transfer by convection, which occurs when air circulates within a space. The small, closed cells in EPS prevent the movement of air within the material, thereby minimizing heat loss through convection.
4. Reflection of Radiant Heat
The outer surfaces of the sandwich panel, typically made of cement boards or other materials, help to reflect radiant heat. This prevents the transfer of heat from external sources like sunlight into the building, further enhancing the insulation properties.
5. Thermal Bridging Prevention
EPS sandwich panels minimize thermal bridging, which is the transfer of heat through more conductive components of a wall or structure (e.g., metal or concrete). The continuous EPS core interrupts these conductive paths, ensuring more consistent insulation throughout the panel.
6. Temperature Stability
EPS panels help maintain a stable indoor temperature by preventing heat from escaping in the winter and blocking heat from entering in the summer, reducing the need for heating and cooling.
The thermal insulation of EPS sandwich panels relies on the material's low thermal conductivity, its ability to limit conduction and convection, and its design to prevent thermal bridging, all of which contribute to improved energy efficiency in buildings.