Energy costs continue to be a factor in building design and construction with increasing pressure from consumers and building owners on architects and engineers to deliver more comfortable, energy efficient spaces. The construction industry is innovating to deliver what the market wants, in ways that the market can sustain from a cost standpoint. Architects and structural engineers look to thermal breaks to improve building envelope thermal performance. The challenge as structural engineers is to incorporate the concept of thermal breaks while maintaining the structural design requirements of the building codes.
A thermal break is a component of construction that has low thermal conductivity. Thermal breaks can also be referred to as thermal barriers. These elements are used to assist in reducing the flow of thermal energy between conductive materials, and therefore are a suitable method for keeping heat in (cold climates) and heat out (warm climates) saving on heating and cooling costs, respectively. A thermally conductive material would allow heat to flow through it in any direction. Common thermally conductive materials in the building construction industry include:steel, concrete and aluminum. The addition of a thermal break increases the overall thermal resistance of an object or assembly. More specifically, thermal breaks can be a load-bearing insulation system for steel-to-steel connections, steel-to concrete connections and the connections of projected reinforced concrete balconies.
The most important aspect of thermal breaks in engineering and construction is the ability to reduce energy loss in the infrastructure (heating or cooling). Examples of areas which experience noticeable energy loss include areas near the windows, doors, and penetrations through the building envelope of buildings where the areas become warmer or cooler in comparison to the controlled and conditioned internal environment of the building. Thermal breaks in these areas of the building can reduce the heat loss through the walls. The practice of using thermal breaks to keep heat in, our heat out in warmer climates, can reduce the amount of energy needed to keep a building a specific temperature, and therefore the costs of heating or cooling. Not to mention comfort for the people using the building would be increased.
Thermal breaks can be used for a variety of structural applications such as thermally broken aluminum windows and doors,curtain walls.
The thermally broken aluminum profiles are separated to parts by thermal barriers. The nature of the thermal barriers determines that it must have high strength and low conductivity at the same time, otherwise it will cause major quality hazards in the insulated aluminum alloy doors and windows and curtain walls (insufficient strength will cause the insulation aluminum profile to escape from the insulation strip The connection is broken), or it loses the meaning of heat insulation (the heat insulation effect cannot be guaranteed if the conductivity is high). Therefore, the performance of the heat insulation strip must be strictly checked:
1. Appearance of door insulation strip
The thermal breaks should be smooth and flat as a whole, without shrinkage, porosity, scratches and mold extrusion traces, and the unique luster of minerals (glass fiber distribution) can be seen on the light, and there should be no parting line marks on the end of the heat insulation strip.
2. Overall dimensional accuracy of door insulation strip
The size deviation of different parts of different batches or the same heat insulation strip is less than 0.1mm, and the parallelism is standard, otherwise the stability of the composite strip cannot be guaranteed, and the internal distortion stress is easily caused, which makes the insulation profile The processed heat-insulated doors and windows have hidden quality risks that are easily deformed.
3. Material properties of door insulation strip
● Thermal conductivity
The metal material as the window frame has a large thermal conductivity, which makes the heat exchange between the inside and outside the house very fast, which is not conducive to the heat insulation of the house in summer, and it is also not conducive to the house in winter. Heat preservation and energy saving. Thermal conductivity is a manifestation of the thermal insulation ability of the heat insulation strip material. The higher the thermal conductivity, the worse the thermal insulation ability of the insulation strip; on the contrary, the better the thermal insulation ability.
● Linear expansion coefficient
The PA66 thermal barriers are used as bridges for thermally broken aluminum alloy windows and doors,curtain wall. The expansion coefficient of the material must be close to that of aluminum to prevent the insulation strips from falling off from the metal due to thermal expansion and contraction.
● Mechanical properties
Transverse tensile strength
When used in winter and summer, there is a big temperature difference between the inner and outer cavity of the heat insulating profile that composes the heat insulating aluminum window. This temperature difference will cause different deformation trends between the inner and outer cavity aluminum materials. In summer, the temperature of the outer cavity profile is high, causing the outer arch to shrink inward. In winter, the temperature of the outer cavity profile is low, causing the inner arch to shrink outward. This constant arching stress will cause the heat-insulating profile to produce a large transverse tension in the middle. If the transverse tensile strength of the thermal insulating strip is low, it will break, which will result in quality problems of the profile.
Longitudinal tensile strength and elastic modulus
The longitudinal tensile strength reflects the mechanical properties of the heat insulation strip in the longitudinal direction. At the same time, the elastic modulus is one of the indexes that can most characterize the performance of the material. In engineering, the elastic modulus is called the stiffness of the material. The resistance to elastic deformation, the larger the value, the smaller the elastic deformation under the same stress, and the more rigid the material.
DIMEX PA66 thermal barriers are of premium quality,which can reduce energy consumption by over 30%. They’re your first choice for your thermally broken aluminum windows and doors!