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Insulation Design of Enveloping Structure for Container Type Activity Room

2017-11-04 21:55:15

In recent years, with the frequent occurrence of natural disasters in various parts of the world and the intensified exploitation of mineral resources, the demand for temporary resettlement houses and field office houses for oilfield mines continues to rise. Growing, rugged, easy to handle and easy to install, container-based mobile homes have gained momentum. Conforming to the tide of energy-saving, environmental protection and economy in today's buildings, the research on heat preservation technology of enclosure structure for container-type movable houses has become an inevitable trend in the development of container-type movable houses.

1 Wai insulation structure design goals and standards 1.1 Indoor thermal comfort Indoor thermal comfort is the people feel satisfied with the indoor thermal environment a subjective feeling. Factors affecting indoor thermal comfort, in addition to the human body's metabolic rate, clothing and other subjective factors, including indoor temperature, indoor humidity, air flow and ambient heat radiation and many other indoor objective factors. Environmental heat radiation is caused by solar radiation that may enter the room and radiative heat exchange between the human body and the surrounding environment such as walls, floors, roofs and the like. Indoor air temperature is the main factor affecting indoor thermal comfort.

According to national standards for heating and ventilation and air conditioning design specifications, residential thermal indoor thermal environment requirements shown in Table 1.

Table 1 residential comfort thermal environment requirements indoor temperature / t: relative humidity / air flow rate Winter improve the thermal insulation properties of the envelope and the insulation of doors and windows and air tightness, can effectively improve the thermal environment inside the container-type mobile room.

Yangzhou Tongli Refrigeration Equipment Co., Ltd. Zhang Yujin 1.2 The difference between building envelope insulation and insulation Building envelope insulation refers to the indoor and outdoor conditions in winter, the envelope to prevent the heat transfer from the interior to the outside, so that indoor The ability to maintain proper temperature. The thermal insulation performance of the envelope refers to the ability of the envelope to maintain the proper temperature of the inner surface under the conditions of natural outdoor ventilation in summer under the combined outdoor temperature (composed of outdoor air and solar radiation) and the fluctuation of indoor air temperature. The main difference between the two is: heat transfer process is different. Insulation properties reflect the winter from indoor to outdoor heat transfer process, thermal insulation properties reflect the summer from the outdoors to the interior and from the indoor to outdoor heat transfer process. In winter, outdoor temperature fluctuates very little in one day, and its heat transfer process is dominated by stable heat transfer. Summer outdoor temperature and solar radiation change greatly with time in one day, which is a periodic unstable heat transfer.

Evaluation indicators are different. Insulation performance is usually evaluated by the value of heat transfer coefficient K (unit: W / (m2!) Or heat transfer resistance R (unit: m2! / W) Insulation properties are usually measured in summer outdoor temperature conditions, In the current energy saving design standards, the thermal insulation is directly measured by the thermal inertia index (D value) of the enclosure structure, and the transparent glass can be evaluated by the shading coefficient SC.

Different construction measures. Winter insulation generally only requires to improve the thermal resistance of the envelope, can be lightweight porous or fibrous materials, through composite insulation or self-insulation to meet the energy requirements. Summer insulation not only requires a larger thermal resistance of the enclosure structure, but also requires better thermal stability (ie, D value is larger); the outer window should also increase the shade factor of the glass or set the shade to reduce solar radiation heat .

2 enclosure structure insulation design requirements 2.1 insulation form In the container type activity room enclosure structure insulation design, combined with local climatic conditions, container-type activity room structural characteristics, multimodal transport conditions and economic requirements, consider Insulation shape, through the calculation of the minimum total thermal resistance, to determine the insulation structure and thickness. On the hot summer and cold winter area, it is necessary to consider the insulation of the building envelope, but also consider the insulation of the winter building envelope.

Due to the requirements of hoisting, stacking and bolting during multimodal transport, as well as the port and yard operating conditions and the limitation of sea and land transport environment, the enclosing structure of container movable houses usually adopts the internal thermal insulation form.

2.2 Insulation Materials As far as possible the use of thermal conductivity of small thermal insulation materials, in order to reduce the thickness of insulation to improve indoor use area.

Insulation materials according to the material can be divided into inorganic thermal insulation materials, organic thermal insulation materials and metal insulation materials in three categories; according to the form and can be divided into fibrous thermal insulation materials, porous (microporous, bubble) -like insulation Insulation materials, laminar insulation materials, such as several. The performance of insulation materials depends on the thermal conductivity of the material, the smaller the thermal conductivity coefficient, the better its thermal insulation properties. Thermal conductivity of thermal insulation materials and its composition, apparent density, internal structure and heat transfer when the average temperature and moisture content of the material. The most commonly used insulation in building envelope structures are molded polystyrene foam, extruded polystyrene foam, rigid polyurethane foam, rock wool panels, glass wool, and the like.

2.3 Fire Performance The fire performance of the insulation system shows that for low-rise residential buildings (under 3 floors), the fire resistance requirements of all construction codes are 0.51.0h. The combustion performance requirements of building components are the most stringent in our country. When carrying out the design of internal thermal insulation for the enclosure structure of container movable houses, the relevant provisions of GB16-1987, Code for Fire Protection of Building Design GB50368-2005 and GB50222-1995 for Designing Fire Protection of Building Interior Decoration can be followed, Burning materials, such as mineral wool board (felt), glass wool board; if the use of foam materials, the combustion properties should reach B1 level.

2.4 Health and environmental protection Insulation materials should be used environmentally friendly materials that do not pollute the indoor environment, that is, does not contain radioactive, carcinogenic and other substances that pollute the indoor environment. At present, the control of indoor environmental pollution in our country includes the indoor environmental pollution control code GB50325-2001 and the indoor air quality standard GB / T 2.5. The internal thermal insulation design of the container movable enclosure enclosure should take account of the enveloping structure Interior design, and strive to thermal insulation materials and interior decoration materials, the integration of decoration, interior decoration process to achieve the standardization and industrialization, increase labor productivity within the decoration, improve the quality and level of interior decoration.

In the process of multimodal transport, the container-type movable room is affected by many factors such as lifting, inserting, stacking and other shipping operations as well as the bump and vibration of sea-land transportation. The box body inevitably deforms. In order to prevent cracking of the inner decorative materials and their joints, the decorative materials should adopt decorative materials with high flexural modulus in the horizontal direction and in the longitudinal direction and certain toughness, and should not be directly decorated with brittle materials such as tile veneers and stone veneers . Hinges should be used within the decorative seam or pressure strip processing, for seamless processing, should be strictly according to the caulking process operation, the selection has a high self-adhesive strength and strength, a certain degree of toughness and good construction performance of the connection Glue and seams.

Mobile room wall or ceiling to be fixed or hanging heavy objects, should be pre-buried lining in the box.

Insulation design should ensure that no condensation on the inner surface, that is, the inner surface temperature is not lower than the indoor air dew point temperature. Dew condensation will make the inner surface of the envelope damp, moldy or even dripping, deteriorating indoor sanitation conditions.

The dew point of the inner thermal insulation structure is where the cold (hot) bridge is located near the inner surface of the outer wall, and dew condensation occurs due to the excessive temperature difference between inside and outside. The design of internal insulation should avoid the existence of cold (hot) bridges.

3 container movable enclosures commonly used structure of the insulation system 3.1 Color Sandwich Panel Insulation System Color Sandwich Panel is the color coated steel panels and color coated steel or galvanized steel floor and insulation core material by bonding Agent (or foam) made of composite insulation board, according to the insulation of the core material can be divided into rigid polyurethane sandwich panels, polystyrene (or extruded polystyrene) sandwich panels and rock wool sandwich board. Color steel sandwich panels between the form of occlusion connection, for damp places, pre-panel surface can be high-frequency heat PVC veneer. Color steel sandwich panel insulation system is generally used for dry box structure, insulation performance of the less demanding container activities room.

3.2 Keel insulation system Keel insulation system is with gypsum board, fiber cement board, calcium silicate board, magnesium board and other interior wall panels to take a way of insulation. Box structure combined with the structural features of light steel structure residential. The thin-plate light steel keel not only serves as the structural carrier but also serves as the fixed foundation for the inner wall panels. The outer side panels can be in the form of corrugated boards, flat panels, wall-press panels and the like. The keel is usually filled with rock wool and glass wool Other fibrous insulation materials.

3.3 composite thermal insulation gypsum board insulation system in Europe in the early 1970s began to apply composite thermal insulation gypsum board insulation system in the building, after nearly 40a of large-scale engineering practice and testing, has formed a sound technical standards to become the mainstream of Europe Building envelope insulation system. Since the introduction of foreign-funded building materials enterprises represented by Ellafarge in 2006 to China, the system has released relevant technical regulations and atlases through a series of theories and testing demonstrations in the construction industry and has been successfully applied to many projects. The composite thermal insulation gypsum board combines the decorative property of the gypsum board and the excellent thermal insulation performance of the thermal insulation material to realize the integral decoration of the thermal insulation material of the movable room of the container type and the interior wall decorative board so as to improve the efficiency of interior decoration.

3.4 Polyurethane insulation system Polyurethane insulation system is combined with the cold box foam technology to form a container-type activities room enclosure structure insulation system, the main process features are pre-container activities of the enclosure around the polyurethane molding structure Injection foam to form the top, side, bottom and other assembly parts, after several assembly, and then the whole part of the junction of secondary foam. Polyurethane insulation system suitable for all forms of box structure, relative to the EPS, XPS and other insulation materials have unparalleled advantages: thermal insulation Polyurethane foam thermal conductivity coefficient 0.024W / (mK), is EPS, XPS, etc. Thermal insulation materials in the thermal properties of the best insulation materials. Molded injection polyurethane foam can adapt to a variety of cross-sectional shape, the formation of continuous effective insulation layer, to avoid the air circulation through the gap or cavity cold (hot) bridge phenomenon.

Strong adhesion polyurethane foam with concrete, wood, steel, Zhejiang Green, rubber and other materials bonded firmly. Molded injection polyurethane foam with the box, interior wall panels effectively combine, even in the most adverse temperature and humidity, and weight, normal collision and many other factors, the insulation layer remains stable, does not appear with the box And interior wall decoration board separation, off phenomenon.

Good fire retardant polyurethane foam is a flame retardant, self-extinguishing carbon material, and no XPS, EPS in case of fire and high temperature drop caused by the fall of the wall, the fire performance can reach B2 level.

Good waterproof performance As polyurethane rigid foam belongs to the closed-cell structure, closed cell rate of 90%, 4% water absorption, can well block the infiltration of water and water vapor, make the insulation system long-term to maintain a good, stable thermal insulation conditions.

Good crack resistance Polyurethane foam is a good flexible material, anti-deformation ability of the outside world, in the external force, temperature, humidity and other deformation under the crack is not easy to effectively ensure the stability and durability of the system.

Good environmental performance Polyurethane rigid foam is a three-dimensional thermosetting cross-linked structure, is a high chemical stability of the material, the foaming agent can be used fluorine-free or semi-fluorine type, which will not produce harmful gases, not indoor environment And the ozone layer cause harm.

Construction of convenient molding injection construction can be mechanized operation, high efficiency. Polyurethane construction of the container-shaped activity room shape adaptability, to ensure the insulation of all parts of the insulation effect.

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