Energy saving and carbon reduction is a global goal. Buildings consume a lot of energy. Reducing the heat transmission capacity (U value) or increasing thermal resistance (R value) can greatly reduce air conditioner energy consumption of buildings.
The lowest thermal resistance value in a building is the window in general. Over 75% of the unwanted heat transfer is through the window. Having a window cover is important to save energy. The thermal resistance value of a single layer light-filtering honeycomb shade is approximately 1.6. A single layer blackout honeycomb shade is approximately 2.5. A 8″ concrete is approximately 1.11. Therefore, having a honeycomb shade is equivalent to adding a wall to the window.
Using honeycomb shade to maintain indoor temperature, can reduce energy waste and save an average of 20% electricity bills. In this inflationary spike era, honeycomb shades are definitely your good partner to save pocketbooks.
Solar Radiation Absorption Coefficient (SHGC):
It refers to the ratio of solar radiation energy entering the room through glass to the solar heat entering the room through an opening of the same size but without glass under the same conditions. The lower coefficient, the less solar heat it transmits.
The SHGC of a standard double-glazed window is 0.76 which means 76% of the incident solar energy is transmitted through the window. Having a honeycomb shade can reduce the SHGC by approximately 0.3.
In summer, honeycomb shades reduce the heat penetrating the windows and maintain a comfortable temperature in the house without burning air conditioning bills. In winter, open the curtains to let the sun warm the interior and draw down honeycomb shades when night falls, as a barrier to prevent heat escaping and keep the house warmer for longer. Besides, blackout honeycomb shades block almost all the sunlight and light-filtering honeycomb shades can soften the light.
U value is the reciprocal of the thermal resistance (R value), a parameter related to the thermal conductivity and thickness of the thermal insulation layer. It says when the temperature between indoor and outdoor is 1 K, how much the heat transformation in each unit time/each unit of the building area is.
Reducing the U value can reduce the air conditioners consumption of buildings and the building material thickness. For example, use 0.05 W/m·K thermal insulation building materials (for example: polyurethane foam PU Foam) to replace the thermal conductivity of 0.8 W/m· K‘s lightweight concrete can make the roof thickness become 1/50 of the original and increase the living space.
Using such building materials can achieve the purpose of environmental protection, energy saving and increase the building usable space. In addition, keep the indoor temperature.
<< Source: “Industrial Materials Magazine” Issue 390 >>
But of course different regions and climates require different building materials. For example, residents in the Middle East use thick materials with high heat capacity to absorb solar heat on the walls, keep the room cool during the day, and release the absorbed heat during cool nights.
Building materials are determined by two values, thermal capacity and thermal conductivity. Like wood has a high heat capacity but a low thermal conductivity thus limiting the heat released during the night. Steel can also store heat but it has a high thermal capacity and conductivity so the heat is absorbed and released rapidly. unable to synchronize with the day and night thermal cycle of the building. Concrete building materials have high heat capacity and appropriate thermal conductivity so that the heat transfer between the surface and the interior of the material can be consistent with the day/night cycle of the building heat. It is called the Urban Island Heat Effect.