Study on Ventilation Situation of Light Roof Z Combination Workshop
Applicability of existing ventilation methods. Method 1: Natural air intake, axial exhaust fan side exhaust method This method mostly uses low side windows and gates to naturally enter the wind. At the same time, the axial fan is installed at the high side of the workshop side wall for mechanical exhaust. Such airflow organization is still good for ventilation of single-span or double-span plants with good sealing performance. If the high side window of the workshop is opened, it is easy to cause a short circuit of the airflow and the ventilation effect is deteriorated. The ventilation effect of the multi-span joint plant is not ideal, especially the middle vortex forming vortex area, which becomes the dead angle of ventilation. Method 2: Natural air intake, centralized mechanical exhaust The method is to use the low side window and the gate to naturally enter the wind, and set the air duct system for centralized mechanical exhaust. The air duct is generally arranged along the string of the column or the roof truss, and the air outlet can be arranged in the upper part or the lower part of the workshop according to the density of the harmful gas in the workshop. Compared with the first method, the ventilation effect of the intermediate span is improved for the multi-span joint plant. Because the exhaust duct can be set up across the span, the air in the middle span can be negatively filled after the intermediate exhaust crosses form a negative pressure. However, in the case of large overall ventilation, the size of the duct is also large, the system layout is difficult and often contradicts the crane; the intermediate cross is from the adjacent span instead of the fresh air, so the intermediate span is still not very good. ideal. Method 3: Mechanical air supply, centralized mechanical exhaust The method is to use a post air supply or air shower and other mechanical air supply, and set the air duct system for centralized mechanical exhaust. This method can stably ensure the ventilation volume and pressure in the workshop without being restricted by meteorological conditions, and can reach the airflow state required by the design. The disadvantage is that the air duct is required for the sending and exhausting systems, the system layout is complicated, and the contradiction between the air duct and the crane is more prominent. Method 4: Mechanical air supply, disperse mechanical exhaust The method is still using mechanical air supply such as post air supply or air shower, and the exhaust air is a comprehensive mechanical exhaust of the roof uniform fan. Most of the workshops that produce harmful substances are in a negative pressure state, that is, the air supply volume is smaller than the exhaust air volume, so the air supply duct is smaller in size than the exhaust duct. For multi-span joint plants, the side span can also take natural air intake. In this way, the size of the duct can be reduced or even eliminated. It is necessary to consider how to install and arrange the intermediate span of the roof fan to properly organize the airflow. In 1987, a research team of the National Machinery Committee conducted extensive investigations on the pollution and treatment of structural workshops in 257 mechanical factories across the country. The survey results show that the ventilation effects of the existing multi-span joint factory buildings are mostly unsatisfactory. The problem is difficult. In the well-ventilated workshops, the successful application of roof fan delivery and exhaust ventilation is particularly eye-catching. The actual situation shows that as long as the design is reasonable, this airflow organization can achieve better ventilation and smoke exhaustion effect. Light roofing is also known as metal-pressed sandwich panel roofing. The metal profiled sandwich panel is composed of two layers of 0.5-0.6mm thick color coated steel sheets with self-extinguishing rigid polyurethane foam in the middle, which are formed by rolling, foaming and bonding. Insulated waterproof roof for light roofs in industrial and civil buildings. In the standard practice of the building profession, the effective width of the sandwich panel is 1000mm; the thickness is 40, 60, 80mm. The thickness is determined according to the insulation requirements of the plant during design; the length depends on the span of the roof, generally <12m. The roof fan itself is not heavy, but its dynamic load must be considered by the structure. For the multi-span factory, the profiled steel plate is used as the roofing material. Since the profiled steel plate has a corrugated shape, the drainage of the roof requires the profiled steel plate to be inclined at a certain angle and drained by the groove. If the roof fan is installed on the roof, the foundation must be higher than the roof. Thymosin Beta 4 Acetate,Cas 77591-33-4,Thymosin Beta 4 Acetate 98%,77591-33-4 In Stock Henan Tianfu Chemical Co.,Ltd , https://www.hnelectronicchemicals.com