Why do mobile homes often catch fire?

The cold bridge condensation phenomenon of the machine-made rock wool color steel plate was numerically analyzed. The results show that when the rock wool sandwich color steel plate is used as the interior wall panel of the building, condensation will occur when the indoor air is relatively humid; however, when the color steel plate is used as the exterior wall panel and roof panel of the building, due to the unique design of the waterproof board and the water collection tank, the color steel plate greatly eliminates the condensation phenomenon and improves the structural strength of the plate. Write down the editor through the thermal analysis and the simulation results of the thermal analysis to verify whether the machine-made rock wool color steel plate has condensation in the indoor cold bridge part.
Because the machine-made rock wool color steel plate has a simple structure, fast construction, and no major restrictions on the construction site, it can be disassembled and reused many times, so it is deeply loved by the majority of builders. However, those who have used color steel sandwich panel products know that fire prevention is the key issue. There is an endless stream of news about the fire of the color steel sandwich panel, and CCTV has also reported many times on the fire in such mobile house buildings.

Why do mobile homes often catch fire? It is because many companies and individuals currently use mobile homes built with polystyrene color steel sandwich panels, which have poor fire resistance. Some workers have a weak fire prevention awareness and are careless, which often causes fires. In some areas, relevant units have greatly strengthened the inspection of mobile homes. Some prohibit the use of mobile homes built with polystyrene color steel plates, and some mobile homes must not exceed two floors. These measures have achieved certain results, but how to fundamentally eliminate the fire safety problems of color steel mobile homes is worth considering. Types of color steel sandwich panels and some problems Now let's take a look at the types of color steel sandwich panels currently used and some problems they have. The first application is a color steel sandwich panel with polystyrene (EPS) foam as the core material. Polystyrene (EPS) foam is flammable when exposed to fire and cannot meet fire protection requirements.

Workers are very likely to ignite during the welding process, and they can all burn out within a few minutes, leaving only an empty frame in the entire prefabricated house. Every year, there are countless extremely serious fires across the country, which are basically caused by the burning of polystyrene foam. In addition to being flammable, polystyrene (EPS) foam also has problems such as easy shrinkage and instability. Because polystyrene (EPS) foam is not resistant to high temperatures, after a period of use, especially foam boards with too low density, shrinkage is very serious. It is 5cm thick when it is first used, and it may only be 4cm after a period of time. After shrinkage, the sealant of the sandwich panel will fall off, and the roof of the prefabricated house will leak. At the same time, the prefabricated house will be unstable and the safety factor is too low. Especially when encountering a strong typhoon, people must be evacuated urgently, and the consequences are unimaginable. The second most commonly used is the color steel sandwich panel with rock wool and glass wool as the core material. Rock wool is a fluffy short and fine inorganic fiber made from natural rocks and minerals through high-temperature melting and fiberization. Glass wool is a material that is formed by fiberizing molten glass to form a cotton-like material. These two materials also have some fatal defects. Rock wool and glass wool generally have a very high density and are very easy to absorb water, which makes them very heavy and difficult to construct. If water enters the material, it will become damp over time, and the rock wool that has absorbed water cannot be used.

In addition, rock wool and glass wool irritate the skin and are harmful to the body. The cotton wool produced during the handling and processing of materials such as rock wool and glass wool is very irritating to the skin and it is very itchy when it sticks to the body. Most workers are very disgusted with this material and are unwilling to touch it. It is also for this reason that the wages of workers who process rock wool and glass wool are generally very expensive. 2 Phenolic foam So is there a better color steel sandwich panel core material? In fact, phenolic foam is a good choice. Foreign countries pay special attention to the fire resistance of building materials, and the fire protection regulations are also very sound. In order to meet the requirements of building fire protection, in recent years, in addition to using rigid polyurethane foam plastics, polystyrene foam plastics, rock wool, and glass wool as the core material of metal composite panels, the use of phenolic foam plastics has also increased. A lot of experimental work has been done abroad on the application performance of phenolic foam metal composite panels, especially in the United States, Germany, Europe, Japan, Australia and other industrially developed countries. It is widely used. According to data, the proportion of phenolic foam in insulation materials in the United States is 38%, and in Europe it is 30%. The Japanese government has even issued regulations to make phenolic foam a standard flame retardant for public buildings. Since polystyrene foam and polyurethane foam are both flammable and not resistant to high temperatures, they are restricted for use by fire departments in some industrially developed countries. For places with strict fire protection requirements, government departments have clearly stipulated that only phenolic foam and its sandwich panels can be used. Therefore, phenolic foam color steel sandwich panels are used under harsh environmental conditions and have good development prospects. 3 Characteristics of phenolic foam Phenolic foam material is a new type of flame-retardant, fire-proof and low-smoke insulation material. It is a closed-cell rigid foam material made of phenolic resin with foaming agent, curing agent and other additives. It has the following characteristics: 3.1 Fireproof and non-combustible Phenolic foam is a non-combustible fireproof material. It does not burn when exposed to fire and has no open flames.

Cold bridge condensation; cold bridge mainly refers to the heat transfer between the building envelope and the external environment. Because the heat transfer coefficient of some parts of the envelope is significantly greater than that of other parts, the heat between these parts is concentrated, thereby increasing the load and energy consumption. Ill cold bridge will increase the space cooling consumption and waste cooling energy; condensation will appear on the side with higher temperature, thus affecting the thermal insulation performance of the insulation material; cold bridge will not only cause heat loss, but also become a weak link in the insulation structure, causing condensation and frost on the side with higher temperature, and the insulation layer will become damp and fail. In severe cases, the structural layer will be damaged by freezing.

Therefore, avoiding the occurrence of cold bridge condensation is a problem that needs to be solved urgently in the current rock wool sandwich color steel plate market. An important condition for testing the quality of rock wool sandwich color steel plates in the market is to verify whether condensation will occur in the indoor cold bridge part. Anhui Sanbao Steel Structure Co., Ltd. uses advanced production technology to produce a rock wool sandwich color steel plate with a simple structure, integrating waterproof, heat insulation, thermal insulation and fire resistance. It has beautiful appearance and high structural strength. It can be widely used in shipbuilding, metallurgy, electricity, construction and other fields.

Thermal analysis of machine-made rock wool color steel plate The upper and lower layers of the molded color steel plate are metal thin plates, and the core material is rock wool with a certain rigidity. It is a structural plate with load-bearing capacity compounded on a dedicated automated production line, also known as a "sandwich" plate.

The sandwich layer of the machine-made rock wool color steel plate consists of a heat insulation layer, a thermal insulation layer and a fire-resistant layer from top to bottom. Channel steel is fixedly installed at both ends of the plate body, and multiple screw holes are installed in the channel steel. A waterproof plate is provided on the upper end surface of the plate body. The waterproof plate arches outward and forms a tile-like structure. There are also water collection tanks on both sides of the waterproof plate. The material of the waterproof plate is stainless steel. See Figure 1. Main size parameters: The rock wool board is 1.2m long and 0.95m wide, the upper and lower metal plates are 0.6ram and 0.5ram thick respectively, and the rock wool layer is 75ram thick.

Introduction to Thermal Analysis Theory ANSYS thermal analysis can simulate three heat transfer modes: heat conduction, convection and radiation. It is mainly used to calculate the thermophysical parameters of components and analyze the temperature field distribution of components. It follows the primary laws of thermodynamics and uses the finite element method to calculate the temperature of each node and derive the required thermophysical parameters. In the ANSYS program, thermal analysis is mainly divided into two categories: steady-state analysis and transient analysis. For steady-state analysis: Q---AU=0, indicating that the heat flowing into the system is balanced with the heat flowing out of the system;