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  • 实验室通风换气次数需要达到什么要旨?
    来源: 浏览:次 发布日期:2020-07-24
    1 换气次数的决定
    1 Selection of ventilation rate
    《化工采暖通风和空调调节策划规范》规定化验室客厅的更小换气量一般在6 次/h~8 次/h。 ASHRAE 规定验房间内部的整体换气次数应由下列风量之决定:从局部排风设备或其他客厅排风所排出的总风量;带走客厅热负荷所需的制冷风量;更小换气次数需求。在使用环境下,实验室的更小换气次数应维持6 次/h~10 次/h。
    According to the code for design of heating, ventilation and air conditioning in chemical industry, the minimum air exchange rate of laboratory room is generally 6 times / H ~ 8 times / h. According to ASHRAE, the overall air change rate in the laboratory shall be determined by the following air volume: the total air volume discharged from the local exhaust equipment or other rooms; the cooling air volume required to take away the heat load of the room; and the minimum air exchange rate requirement. Under the condition of use, the minimum ventilation rate of the laboratory should be maintained at 6 times / H ~ 10 times / h.
    在一贯环境下>10 次/时客厅换气次数被认为是合适的。但是当实验房间内部有可能产生高热负荷的归纳设备,或客厅内有较大量的局部排风时,则可能需要相应增大换气量。湿法化学室有通风柜,加热间有大量的加热炉。通风柜的计算方法则参照《化工采暖通风和空调调节策划规范》中对轻、中度危害或有危险的有害物质,在房间内部顶棚有补风的环境下,通风柜的操作口更小吸风面速度0.5m/s。对于通风柜的使用率,当通风柜的数量大于2个时,则应该取60百分比~70百分比再是使用率。加热炉则是以维持炉内加热温度的热平衡法则计算所需的排风量。通过如该可以计算出总的安全通风量,易于 得出负荷计算的空调风量,还有更小换气次数10次进行比较,三者取值。
    In general, the room ventilation rate > 10 times / hour is considered to be appropriate. However, when there are analytical equipment with high heat load in the laboratory, or there is a large amount of local exhaust in the room, the air exchange rate may need to be increased accordingly. There are fume hoods in the wet chemical room and a large number of heating furnaces in the heating room. The calculation method of fume hood is referred to the design code for chemical heating, ventilation and air conditioning regulation for light, moderate or dangerous hazardous substances. Under the condition that the indoor ceiling has air supplement, the minimum suction surface speed of the operation port of the fume hood is 0.5m/s. For the utilization rate of fume hood, when the number of fume hood is more than 2, the simultaneous utilization rate of 60百分比 ~ 70百分比 should be taken. Heating furnace is to maintain the furnace heating temperature of the heat balance law to calculate the required exhaust air volume. Through the above, the total safe ventilation can be calculated. In addition, the air volume of air conditioning calculated by the load is compared with the minimum air change frequency of 10 times, and the maximum value of the three is taken.
    2 送风和排风形式
    2 air supply and exhaust forms
    《化工采暖通风和空调调节策划规范》规定化验室的排风量较大时,应设置露天新风补风系统,并计入新风负荷。
    "Code for design of heating, ventilation and air conditioning regulation of chemical industry" stipulates that when the exhaust air volume of the laboratory is large, outdoor fresh air supplement system should be set up and the fresh air load should be included.
    《科学实验室建筑策划规范》规定每个排风装置宜设独立的排风系统。同一个实验房间内部的一切排风装置宜合用一个排风系统。work时间连续使用排风系统的实验室应设置送风系统,送风量宜为排风量的70百分比,并应按照手工制作要旨对送风进行空气净化处理。对于采暖区域,冬季应对送风进行加热。送风气流不应破坏实验室排风装置的正常work。
    According to the code for architectural design of scientific laboratory, each exhaust device should be equipped with an independent exhaust system. All exhaust devices in the same laboratory should share one exhaust system. The laboratory that uses exhaust system continuously during working hours should be equipped with air supply system, the air supply volume should be 70百分比 of the exhaust air volume, and the air supply should be purified according to the process requirements. For heating areas, the supply air should be heated in winter. The air supply should not damage the normal operation of the laboratory exhaust device.
    ASHRAE 规定一切从化学实验房间内部排出的气体均需直接排出露天,而不能循环利用。易于 ,除非化学实验室也有洁净要旨,否则均需保持其相对于相邻区域为负压。而是否决定100%全新风送风系统,应做为实验室危险评估的一个要紧部分。
    ASHRAE stipulates that all gases discharged from the chemical laboratory should be directly discharged out of the room, and can not be recycled. Therefore, unless the chemical laboratory also has cleaning requirements, it is necessary to keep the negative pressure relative to the adjacent area. Whether to choose 100百分比 fresh air supply system should be an important part of laboratory risk assessment.
    实验室装潢
    实验室各个单圆间设置了独立的排风系统,排风都安装在屋顶上。湿法化学间和加热间由于产生有毒、腐蚀、 摄氏的气体,必须采取应用全新风处理。其他如work人员进行计算机归纳的通用实验间和进行质料测试的恒温恒湿间,100%全新风送风系统并不是的决定。因为实验室不同的手工制作职能,不一定要全新风通风或全新风空气处理。能满足手工制作只能是首尾的,100百分比的新风是针对通风柜的环境,而对于一般实验室循环空气处理能达到要旨的,就不需要100百分比全新风。何况在全新风的空调环境下,能耗非常高。
    Each unit of the laboratory is equipped with an independent exhaust system, which is installed on the roof. Due to the toxic, corrosive and high temperature gas produced in the wet chemical room and heating room, fresh air treatment must be adopted. For example, the general laboratory for computer analysis and the constant temperature and humidity room for material testing, 100百分比 fresh air supply system is not the only choice. Because of the different process functions of the laboratory, fresh air ventilation or fresh air treatment is not necessary. To meet the process can only be the first, 100百分比 fresh air is for the environment of fume hood, and for the general laboratory circulating air treatment can meet the requirements, it is not necessary to 100百分比 fresh air. Moreover, in the air-conditioning environment with fresh air, the energy consumption is very high.
    3 客厅压差
    3 room differential pressure
    《化工采暖通风和空调调节策划规范》规定化验室应保持相对负压。
    According to the code for design of heating, ventilation and air conditioning in chemical industry, the relative negative pressure should be kept in the laboratory.
    ASHRAE 规定一切从化学实验房间内部排出的气体均需直接排出露天,而不能循环利用。易于 ,除非化学实验室也有洁净要旨否则均需保持其相对于相邻区域为负压。
    ASHRAE stipulates that all gases discharged from the chemical laboratory should be directly discharged out of the room, and can not be recycled. Therefore, unless the chemical laboratory also has cleaning requirements, it is necessary to keep the negative pressure relative to the adjacent area.
    这个规定莫过于要按照具体的实施对象。本porject中恒温恒湿间需要严格的温度、湿度把握范围,应该策划成正压。因为如果策划成负压,则相邻区域的空气去进入,一关键可能破坏温、湿度的把握精;另一关键如果污染的空气进入,也可能遭成安全小case。而对于湿法化学间和加热间,为防止有毒、腐蚀、 摄氏的气体或挥发物散发到客厅,甚至散发到其他的区域,策划成负岩子 潜匦氲摹J笛槭医ㄖ的work使用区域,应相对于走廊和实验室始终维持正压。实验房间内部气流应从低危险区域流向高危险区域,更终通过各类通风柜或加热设备排到露天。
    In fact, this provision should be based on the specific object of implementation. In this project, the constant temperature and humidity room needs strict temperature and humidity control range, which should be designed as positive pressure. Because if it is designed as negative pressure, the air in the adjacent area will enter. On the one hand, it may damage the control precision of temperature and humidity; on the other hand, if the polluted air enters, it may also cause safety problems. For wet chemical room and heating room, it is necessary to design negative pressure in order to prevent toxic, corrosive and high temperature gases or volatiles from spreading to the room or even other areas. The office area of the laboratory building should always maintain positive pressure relative to the corridor and laboratory. The air flow in the laboratory should flow from the low-risk area to the high-risk area, and finally to the outdoor through various fume hoods or heating equipment.
    4 把握系统
    4 control system
    把握应该把如该几项综合起来,可以满足整个实验室的客厅压力、各客厅压差、通风量、温湿度和各关键的安全把握要旨,再是降低能耗。实验房间内部往往存在许多不利于人体康泰的化学物质污染源,特别是有害气体,将其排除非常要紧。但与此再是,能源往往会被大量的消耗,易于 实验室的通风把握系统的要旨从早期定风量,双稳态,变风量系统,到的适应性把握系统。所谓更为安全、舒适的环境,并要旨更节能的方式是不能太过于奢望。系统响应迅速确保人身安全,以的精确性正确把握送排风的平衡和房间内部压力,供给的稳定性。尽量降低用户後期投入,再是减少用户在运行、能源消耗及维护等关键的费用。
    The control should integrate the above items, which can meet the requirements of room pressure, room pressure difference, ventilation rate, temperature and humidity and other aspects of the laboratory, and reduce energy consumption. There are many chemical pollution sources, especially harmful gases, which are harmful to human health. But at the same time, energy is often consumed, so the requirements of laboratory ventilation control system are from the early constant air volume, bistable, variable air volume system to the latest adaptive control system. The so-called most safe and comfortable environment, and the most energy-saving way is not too extravagant. The system responds quickly to ensure personal safety, accurately controls the balance of air supply and exhaust and indoor pressure with the highest accuracy to provide maximum stability. Try to reduce the user's early investment and reduce the user's expenses in operation, energy consumption and maintenance.
    ASHRAE 规定实验室把握一关键调整设备的温度和湿度把握;另一关键监控安全装备设施保护work人员,用哪个系统,只
    ASHRAE stipulates that on the one hand, the laboratory control adjusts the temperature and humidity control of the equipment; on the other hand, it monitors the safety facilities to protect the staff, which system is used only
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