Building On The Exterior Walls Of The New Energy Save System

Construction of energy save has a advance enormous significance.Construction to improve the external structure of the insulation is a very important step for the building energy save.In recent years,the effect of exterior walls insulation technology has been proved better than the inside wall insulation,self-insulation and the sandwich structure insulation.It is worthy of further study.After been studying a variety of thermal insulation technology,the author found most of the thermal insulation technology design is almost a single train of thought -to prevent heat transfer target.It is totally dependent on some kind of insulation effect of a low thermal conductivity of porous light-weight materials to achieve the necessary thickness,giving rise to a number of prevalent and difficult to overcome shortcomings. For example:1) It is difficult to meet energy-saving65%and 65%higher energy efficiency requirements;2)There are still doubts about the durability of the system and the surface cracking off problem;3) The majority of insulation materials and construction have poor performance of fire;4) The majority of insulation materials are the potential environmental load;5) The producer did not have their own intellectual property rights;6) Thermal properties are considered inadequated,such as insulation, rule out the moisture and so on.There is no doubt that this shortcoming of restricting the exterior walls insulation technology and development.There are three basic ways of nature heat transfer:heat transfer,convection and heat radiation,The wall construction is no exception.Three ways of heat transfer,in the case of closed air layer,heat radiation transfer accounts for about 70%of the total, followed by about 20%of the convection,heat transfer is only a minimum 10%.We have no reason to be confined in the heat transfer field.The largest thermal transfer radiation should be considered as the main contradiction to solve.Therefore, the author believes that more efficient design,advanced thermal insulation system, must seize this critical block heat radiation first.Then to make full use of the air in the cavity(thermal conductivity 0.02w/m.k) to enhance the performance of winter heat insulation effect.And make full use of the cavity in the air convection to solve summer heat insulation problem.Innovation and development of thermal insulation technology must revolute from ideas and concepts.This paper gives the concept of "reflective cavity insulation skin structure".That is to say,it has not only the structure(bone),but also "skin" of building the external walls.The "skin" is the construction of "environmental filters"(Yang Jinwen scriptures),the "skin" should be a separate part of the structure and appropriate ways to connect to the structure of the body."cavity insulation reflective skin structure"is the use of thermal engineering design of the basic principles of building a new wall insulation program.It is characterized by:using strong reflection blocks heat radiation material,using controlled inside and out the mouth so that the exhaust air cavity insulation or insulation to achieve the effect,if necessary,and it can set light porous layer insulation materials.In this paper,the author research and establish a new system of the exterior walls energy save.The system consists of three main parts:1) strong reflection layer material; 2) air between the layers;3) Indirect fixing method.Because of the reflective material is thin,the insulation layer structure got a significant reduction in weight.In the conditions of modern technology,the reflective material can be attached to virtually any surface.Step by step for the future development of a variety of insulation materials to create the conditions for the skin,Buried a foreshadowing.Reflective material almost no combustion,compared with the use of polystyrene material,has been proved much safer;at the same time,durability and environmental performance is much better. The system includes a low-end and high-end "reflection cavity insulation skin structure",can adapt to the economic development of different regions.The technology of the system is mature,high level of industrialization,easy to install also convenient. In this paper,the author also discussed the system's facing issues and the solution.