What is a green building and how to improve the thermal insulation performance of the wall

Green building refers to the building that maximizes resource conservation (energy saving, land saving, water saving, material saving), protects the environment and reduces pollution, provides people with healthy, applicable and efficient use of space, and coexists in harmony with nature during the whole life cycle of the building. (Excerpted from the Green Building Evaluation Standard GB 50378).

To improve the thermal insulation performance of the wall, we must first look at the area to which the project belongs, which belongs to the severe cold area, the hot summer and cold winter area, or the hot summer and warm winter area.

For example, in hot summer and cold winter areas, the use of external shading technology can be increased, and external shading will be very effective for the thermal insulation performance of walls in hot summer and cold winter areas, and the external shading technology has been very mature.

For example, in areas with hot summers and warm winters, we should pay attention to the use of self-shading and building ventilation technology to facilitate heat dissipation.

Generally speaking, green building refers to a building that consumes less resources, consumes less energy and has little impact on the environment while providing people with healthy, applicable and efficient space in the whole process of building construction and use.

Improve the thermal insulation performance of the wall.

From a technical point of view, through reasonable design, the following measures can effectively improve the thermal insulation performance of buildings and reduce energy consumption.

1) The shape coefficient of the building should be reduced as much as possible.

2) Exterior doors and windows bear the main lighting and ventilation functions of the building, and it is an important way to improve the thermal insulation performance of external windows by selecting an appropriate window-to-wall area ratio, using windows with small heat transfer coefficients, and solving the problem of external shading of external windows.

3) Reduce the heat transfer coefficient of the cabin surface and exterior wall as much as possible, and enhance the thermal insulation performance of the roof and exterior wall.

From the management level, strengthening the quality management of various thermal insulation materials is a strong guarantee for the implementation of building energy conservation and improving the thermal insulation performance of buildings.

1) Establish a sampling inspection system for thermal insulation materials used in engineering projects to ensure the quality of materials used.

2) The use of various types of insulation systems for each part of the building envelope and the selection of door and window parts must be in accordance with the idea of ensuring the overall energy-saving and thermal insulation effect, and reasonably select the methods and materials with good economy, convenient construction and easy quality control.

What are the thermal insulation and energy-saving structures of building walls? What are the requirements? Please see the article of Zhongda Consulting.

1.National Thermal and Climatic Divisions (5 Thermal Divisions, 7 Hunger Manuscript Climate Divisions);

2.Winter insulation design requirements;

3.Heat-resistant design requirements in summer.

Code for Thermal Design of Civil Buildings GB50176-93 points out:

a) The outer surface is finished with a light color.

b) Set up ventilation layers, such as ventilation roofs, ventilation walls (air layers 20 50mm thick), etc.

c) Adopt hollow walls, such as porous concrete, light aggregate hollow blocks, etc.

d) Heavy materials such as bricks or concrete should be used on the inside of the composite wall.

e) Set up a closed air interlayer with aluminum foil (which can reduce radiative heat transfer). When the air interlayer of single-sided aluminum foil is bright, the aluminum foil should be set on the side with higher temperature.

f) Adopt 150 200mm thick water storage roof, roof greening, wall vertical greening, etc.

g) In order to prevent the condensation and dampness of humid air on the ground in the mildew season, the lower part of the ground should adopt insulation measures or overhead practices, and the ground surface layer should use microporous hygroscopic materials.

List of project tendering owners.

List of bidding owners of Jilin project.

List of bidding owners of Heilongjiang project.

Because it is used on the exterior wall, it can effectively improve the fire performance of the building, and the closed cell rate is greater than 90%, which has good thermal insulation performance and can shorten the construction period.

According to the current national standard Xunbo key quasi-"Unified Standard for Construction Quality Acceptance of ICBC Departure Construction" GB50300 provisions of the construction quality acceptance of external wall external thermal insulation engineering, the quality acceptance of wall energy-saving engineering is as follows:

Muqiao 1) is suitable for the quality acceptance of building wall energy-saving projects using wall insulation materials or components such as plates, slurries, and blocks.

2) The wall energy-saving project should be constructed after the quality acceptance of the main structure and the base layer, and the wall energy-saving project constructed at the same time as the main structure should be accepted together with the main structure.

3) Before the energy-saving renovation of the existing building, the base layer should be treated to meet the requirements of the design and construction technology.

4) When the wall energy-saving project adopts a complete set of external insulation technology or products, the type inspection report should include the weather resistance inspection.

Building energy conservation should make full use of natural lighting, natural ventilation, improve the thermal insulation performance of the envelope structure, and should also comply with ().

Building energy conservation should make full use of natural lighting, natural tremor and ventilation, improve the thermal insulation performance of the envelope structure, and should also comply with the () building as far as possible to adopt the north-south tomato layout. Otherwise, the thermal insulation performance of the building envelope must be strengthened and the construction cost needs to be increased. Between the complexes and inside the buildings, there should be good natural ventilation in summer.

At present, the energy-saving and thermal insulation materials of the wall include organic (such as benzene board, polystyrene board, extruded plastic board, polystyrene foam board, rigid foam polyurethane, polycarbonate and phenolic, etc.), inorganic (such as perlite cement board, foam cement board, composite silicate, Oudian OK inorganic active wall insulation system, rock wool, autoclaved sand aerated concrete block, traditional insulation mortar, etc.) and composite materials (such as metal sandwich panel, core material is polystyrene, vitrified microbeads, polystyrene particles, etc.), thermal insulation and anti-cracking materials: (welded wire mesh, hot-dip galvanized steel wire mesh, mesh cloth).

Exterior wall panels, interior partition panels, interior partition instead of paper gypsum board, roof panels, etc., length: l 4500mmThe width b is 300mm-1000mmThickness: 60mm-120mmRange.

Wire mesh products.

Welded wire mesh, steel wire mesh, mesh cloth, steel plate mesh, steel mesh sheet, mesh sheet, corner protection mesh, etc.

The welded wire mesh of the building wall insulation is also called the welded wire mesh, which can effectively prevent cracks and hollowing of the wall, and effectively ensure the efficiency of construction;

Welded wire mesh is one of the necessary building materials for building anti-cracking engineering, with good crack resistance, excellent quality of anti-corrosion and non-rusting, galvanized welded wire mesh is also divided into two kinds of cold plating and hot plating, which has a great contribution in the exterior wall insulation industry, and the product is widely used.

There are two types of exterior wall stucco plastering mesh: one is hot-dip galvanized steel wire mesh (long service life and strong anti-corrosion performance); The other is to change the wire mesh (economic concessions, smooth mesh surface, white and shiny), according to the requirements of the region, the construction unit to carry out reasonable material selection, the specifications of the stucco construction wire mesh are mostly between the wire diameter.

The construction of steel wire mesh on the inner and outer walls of construction projects can effectively solve the cracks, falling off and hollowing of the wall, which has become a popular trend in recent years, and the hot-dip galvanized steel wire mesh has also been unanimously recognized by everyone.

Hope it helps you ...

The plate needs to have fire protection requirements: grade A, grade B1 every 2 layers to do fire insulation isolation belt, the flame retardant performance of the plate is reached, mortar is an important material for wall insulation, cracking of the plate joints, falling off and other reasons, the original strength of the mortar is easy to reach, water resistance, temperature resistance or the weather resistance of the system is often ignored by people, after building a house for decades is not a year and a half, I hope my suggestions can help you. Mine can leave a message if I need help.

Answer: a, c, d, e

2021 Textbook P250 2020 Textbook P249

The thermal conductivity, density, compressive strength or compressive strength, and combustion performance of the thermal insulation materials used in the wall energy-saving project should meet the design requirements. When inspecting, the quality certification documents and the re-inspection report should be checked (the re-inspection should be witnessed and sampled for inspection. And the thermal conductivity, density, compressive strength or compressive strength of the thermal insulation material dust excitation material, the bonding strength of the adhesive material, the mechanical properties and corrosion resistance of the reinforced mesh are re-tested.