It usually involves the appropriate ratio of window to wall area, improving window’s airtightness, improving window’s thermal performance by using multiple glazing, Low-E technologies, etc. 8.2.2 Climate-specific design of energy-efficient envelopes This is undesirable because it promotes microbial growth raising health issues, as well as reducing the life of building envelope. Walls with thermal insulation also have a higher possibility of surface condensation when the relative humidity of ambient air is greater than 80%, provided the convective and radiative heat transfer coefficients of the exterior wall are small ( Sadineni et al., 2011). Increasing the thickness of insulation results in increased cost. This is evident from the fact that the thickness of insulation in building has increased since the early 1970s, almost doubling in Northern Europe ( Papadopoulos, 2005). The method was very popular, especially in Northern Europe. Increasing the thickness of the insulating material is the simplest way to increase the thermal resistance of a facade. 8.2.1 Increasing thermal resistance of the building envelope Have effective airflow control to minimize infiltration of outdoor air. Use vapor barriers and are effective in vapor control, Have high thermal resistant materials in the facade of the building, Building envelopes of energy-efficient buildings are not simply barriers between interior and exterior they are building systems that create comfortable spaces by actively responding to the building’s external environment, and substantially reduce the buildings’ energy consumption ( Aksamija, 2015 ). Since a building envelope separates the unconditioned exterior environment from the conditioned interior space, it is one of the key factors that impact building energy consumption. A building envelope consists of fenestration (doors and windows), roofs, walls, and insulations. Other important factors include cost, flammability, flexibility and ease of installation.A building envelope is a physical barrier between the external environment and the internal conditioned space, keeping the residents comfortable. _Also like the clothing one wears, the moisture that the insulation prevents or allows is critical for the comfort of the occupants and performance of the mechanical systems in the building. For ease of visualization, a typical ski jacket has an insulating value of R2, a polar rated blanket would be R4-6. The type of insulation you select when designing and constructing a space will depend on your climate and the R-value ( a measure off thermal Resistance) you seek- much like the type of jacket you select for the weather outside. Of course the wall and roof shell is really a sandwich of materials, the stuff you see and the stuff you don’t. Historically, many different materials have been used as insulation, and many of these have now been abandoned in favor of the more modern, safer and efficient materials. Additional materials are integrated into the building’s envelope specifically to add insulating value to the walls, floors, and roofs/ceilings. Sounds boring? Hmm, It is, until your energy bills come in.Īll building materials have an inherent insulating property, usually measured on a scale known as R-value. Reducing the transmission of thermal energy not only makes spaces more comfortable, but it is also essential to controlling energy costs. In simple terms, this helps keep heated interior space warmer in the winter, and air-conditioned spaces cooler in the summer. Insulation is a critical as part of a building’s thermal envelope.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |