With the continuous improvement of people's living standards, modern people's pursuit of living environment and quality of life is also getting higher and higher. In view of the hot and humid climate in summer hot summer and cold winter in China, from the perspective of livability, certain measures must be taken to ensure a comfortable indoor environment. One of the main measures is to improve the insulation of the building envelope. Insulation capacity is achieved. The energy-saving design standards for residential buildings in the hot summer and cold winter areas have proposed the energy conservation fund project: the 50% target of the Ministry of Education's doctoral fund (new teacher category) project (2010140212(1)07), and the enclosure structure bears 23% of it, starting in 2010. It is necessary to implement the third-step energy-saving design standard goal, which requires energy saving of 65%. It is of great practical significance to study a building maintenance structure wall material that has both thermal insulation capacity and building energy-saving design standards. Based on the guidance of the above ideas, the research group is committed to researching a new type of wall material, namely thermal insulation, heat insulation and load-bearing, and an inorganic thermal insulation load-bearing block. The block is made of ceramsite vitrified microbead insulation mortar, lime, silica fume, cement, etc. as the basic raw materials, plus appropriate amount of admixture, formed by water mixing, casting molding, standard curing and other processes to meet the green environmental protection materials. Required wall material. The block has good thermal insulation properties while having the physical and mechanical properties of ordinary blocks. As a structural material, the inorganic heat-insulating load-bearing block has comprehensive performances of earthquake resistance, economy and energy saving, and is convenient in design and construction, and can truly realize self-insulation of the structure.
The performance characteristics of the inorganic heat-insulating load-bearing block produced in this test are: 28d compressive strength greater than 10.560MPa; thermal conductivity less than Q 1 inorganic thermal insulation load-bearing block 1.1 block making reference patented manufacturing method of inorganic thermal insulation load-bearing block, However, the difference is that the stone which has a great influence on the thermal conductivity and bulk density of the block is not used, and the silica ash in the composite lightweight aggregate is used as an influencing factor alone, and then one is added. A composite admixture developed by the research team. The specific production method is as follows: selecting vitrified beads, ceramsite sand, silica fume, lime and admixture as raw materials, and measuring the compressive strength of the mold by 240 mm 115 mm 90 mm, as shown. The thermal conductivity of 30 mm was chosen.
Before the test piece is prepared, the test piece mold should be dusted and oiled. The inner wall of the test piece is required to be smooth and clean, and the screw of the mold must be tightened.
Inorganic heat-insulating load-bearing block block Double-sided cement block pulp is mechanically stirred and vibrated by a vibrating table. After completion, the test piece is placed at room temperature 2 (±5 ° C, and the relative humidity is greater than 50% for two days. When dismantling the mold, care should be taken to avoid excessive force, to ensure that the specimen is not damaged during the demoulding process, and to ensure that the surface is flat and angular. After the test piece is completed, it is cured at room temperature 2 (± degrees greater than 95% under standard curing conditions for 28 days). The test was divided into 9 groups, each of which was tested for compressive strength of 3 pieces of 240mm×115mriK 90mm, and the thermal conductivity of 2 pieces of 30mm molded parts was measured. Taiyuan Cisco Technology Development Co., Ltd. was adopted.
Table 1 Thermal performance of inorganic thermal insulation load-bearing blocks Block size / mm heat storage coefficient / thermal conductivity / heat transfer coefficient / thermal resistance / W. (mDK) - 49: brother, å£, R is the heat of each layer of material Resistance, m2.K/W; W, W, W are the thickness of each layer of material, m; X1, X2, respectively, the thermal conductivity of each layer of material, taking the heat transfer resistance R of the enclosure structure according to 2) Calculate the internal surface heat transfer resistance, take 0l11m2.K/W; R (for the external surface heat transfer resistance, take Q04m2.K/W; R is the envelope structure multilayer material 1.2 thermal performance calculation insulation wall The thermal insulation performance is usually evaluated by heat transfer coefficient or heat transfer resistance. The heat transfer coefficient and thermal inertia of the thermal insulation wall are calculated as follows.
1.2.1 Heat transfer coefficient K The thermal resistance of the enclosure structure shall be calculated according to the thermal resistance calculated by equation (1). The heat transfer coefficient K of the mK/W. enclosure shall be heat transfer according to equation (3) computer insulation load-bearing block. Thermal resistance R = 1.49 m2.K / W, heat transfer coefficient K = 0.67 W / (m2. K).
1.2.2 Thermal inertness index D The thermal inertia index D of the multi-layer material envelope structure shall be calculated according to formula (4), W/(m°K). The heat storage coefficient of the air layer is S=0. It can be seen that the thermal inertia index of the inorganic heat-insulating load-bearing block D=3.114. 2 Ordinary concrete block In order to analyze the thermal performance of ordinary concrete, the thermal work of ordinary concrete block is specially measured. Performance, as shown in Table 2.
Table 2 Thermal performance of ordinary concrete blocks Block size / heat storage coefficient / thermal conductivity / heat transfer coefficient Thermal resistance / external wall heat transfer coefficient / W /. (m2 ° K) - 1 '3 layer building - 8 layers Building>9-storey building cold area (A)0. 21 Thermal performance calculation heat transfer coefficient K=3 Result analysis According to the standard, the heat transfer coefficient and thermal inertia index of the external wall part should meet the following requirements: heat transfer coefficient <1.5, Thermal inertia index Peng 3. 0; heat transfer coefficient capacity 1.0, thermal inertia index D more 25. For inorganic insulation load-bearing blocks, its thermal performance meets this requirement.
The evaluation of the thermal insulation performance of the block is usually based on the heat transfer coefficient or the thermal resistance value. The smaller the K value, the larger the R value, and the better the thermal insulation performance. The thermal insulation performance of the material is mainly determined by the density and thermal conductivity of the material, the heat storage coefficient and other indicators. The greater the density and heat storage coefficient of the material, the better the thermal insulation performance. It can be seen that the inorganic heat-insulating load-bearing block is superior to the ordinary concrete block. The limit of heat transfer coefficient of the outer wall in cold regions is shown in Table 3.
Table 3 Heat transfer coefficient of external wall in cold area The heat transfer coefficient when using this block alone is 0.67. It can be seen from Table 3 that when the block is used in buildings with less than 8 floors, it can be used together with the research group. After the development of the vitrified microbead insulation mortar, it can fully meet the standard of 65% energy saving.
Assume that the maintenance structure and indoor air of an ordinary house are simplified to a simple thermal system, and the indoor temperature fluctuation range is less than 1.0 ° C, and the load is calculated. The method used in the calculation is the cold load coefficient method.
Calculate the summer outdoor daily average temperature tZP is tzp and select the summer indoor basic calculation temperature tNx is 26 °C, assuming that the heat transfer area of ​​the inorganic thermal insulation load-bearing wall is 8 m2, the cold load formed by the heat transfer of the wall is calculated. Heat transfer coefficient, W / (m2.K); F is the heat transfer area of ​​the external wall, m2; tNx is the indoor calculated temperature, C; if the temperature is calculated outdoor, C. similarly, through the ordinary concrete solid brick wall The cold load formed by heat is considered to be the daily use condition. It is assumed that the average daily air-conditioning usage time is about 12 hours, and the monthly calculation is based on 30 days, and the energy consumption is 65%. When using the building above 9 floors, the inorganic insulation load-bearing The heat transferred into the room by the block wall is 255.936K12K3. The difference between the two is 255.936K12K3. For the single-sided outer wall, the inorganic insulation load-bearing outer wall is more than the ordinary concrete block. The external wall is energy-efficient at 80% within 1 month under the same conditions. 4 Economic analysis The economic advantages of the new wall material are: 1 The inorganic insulation load-bearing block has good protection The new performance of thermal insulation can reduce the usage and usage time of air conditioners and other heating equipment after use. Wide use can save a lot of energy such as coal and electricity, greatly reducing the energy consumption of buildings. 2 Transportation, because of its large use of ceramsite, it is much lighter than ordinary concrete blocks, which can save transportation costs. Reduce the labor intensity of workers and reduce labor costs.
5 Conclusions The inorganic thermal insulation load-bearing blocks studied in this paper meet the heat transfer coefficient <1.0 and the thermal inertia index 25; the vitrified micro-bead insulation mortar is used according to the energy-saving design standards for residential buildings in severe cold and cold regions. The inorganic thermal insulation load-bearing block produced by ceramsite can achieve the standard of energy saving of 65%; the inorganic thermal insulation load-bearing block is 80% more energy efficient than ordinary concrete block.
1. Application : For machinery accessory
2. Dimension: Customized dimension, OEM & ODM
3.Material: A6063, A6061, A3003 and other series alu alloy
4.Suface treatment: Anodizing, polishing, turning ,power coating, mill finish etc
5.Equipment: CNC ,extruding machine, cold drawn machine, heating oven, straightening machine, cutting machine
|
OD |
OD Tolerance |
ID Tolerance |
Roundness |
Straightness |
Circular run-out |
|
φ16-20 |
±0.02 |
±0.02 |
0.01↓ |
0.015↓ |
0.05↓ |
|
φ20-30 |
±0.02 |
±0.02 |
0.01↓ |
0.015↓ |
0.05↓ |
|
φ30-50 |
±0.05 |
±0.05 |
0.02↓ |
0.020↓ |
0.08↓ |
|
φ50-80 |
±0.15 |
±0.10 |
0.05↓ |
0.025↓ |
0.10↓ |
6. STANDARD PACKING:Wooden case/carton
7. Trade Terms
1. Payment: 30% T/T in advance, 70% balance pay before delivery. L/C at sight.
2. Delivery time: 20 days after deposit receiverd. If opening mould, plus 7-10 days.
3. Trade Term can be chosen depending on your requirements.
4. FOB Port: Shanghai
Contact Us
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1. Attn: Karina Gu
2. Mobile: +86-18961469527
3. Tel: +86-519-88761254
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