通风管道的机械通风的原则有哪些？

发布人：http://www.sftfgd.com   发布时间：2023-01-23 23:36:37

1、稀释通风

1. Dilution ventilation

稀释通风又称搀杂通风，即送人比室内污染物浓度低的空气与室内空气搀杂，以此下降室内污染物的浓度，抵达卫生标难。

Dilution ventilation, also known as mixing ventilation, is to send air with lower concentration of indoor pollutants to mix with indoor air, so as to reduce the concentration of indoor pollutants and reach the sanitary standard.

2、置换通风

2. Displacement ventilation

在置换通风体系中，鲜美冷空气由房间底部以很低的速度送入，送风温差仅为2—4Y。送入的鲜美空气因密度大而像水相同弥散悉数房间的底部，热源导致的热对流气流使室内发生笔直的温度禅度，气流迟缓上升，脱节作业区，将余热和污染物推向房间顶部，由设在顶棚上或房间顶部的排风口直接扫除。

In the displacement ventilation system, fresh and cold air is sent from the bottom of the room at a very low speed, and the temperature difference of the air supply is only 2-4Y. Due to the high density of the fresh air sent in, it diffuses at the bottom of all rooms like water. The heat convection air flow caused by the heat source causes a straight temperature rise in the room. The air flow rises slowly, disjoint the operation area, push the waste heat and pollutants to the top of the room, and directly sweep away by the exhaust outlet on the ceiling or the top of the room.

室内空气近似活塞状活动，使污染物随空气活动从房间顶部扫除，作业区根本处于送入空气中，即作业区污染物浓度约等于送人空气的浓度，这是置换通风与传统的稀释全盘通风的很大别离。在通风管道中，显着置换通风的通风成效比稀释通风要好。

The indoor air moves like a piston, so that the pollutants are swept from the top of the room along with the air movement. The operation area is basically in the air, that is, the concentration of pollutants in the operation area is about equal to the concentration of the air sent. This is a big difference between displacement ventilation and traditional dilution ventilation. In the ventilation duct, the ventilation effect of significant displacement ventilation is better than that of dilution ventilation.

3、片面通风

3. One-sided ventilation

片面通风便是欺诈片面气流，使片面当地不受有害物的污染，构成优异的空气环境。

One-sided ventilation is to cheat one-sided air flow, so that one-sided local is not polluted by harmful substances, and form an excellent air environment.

片面通风体系分为片面送风和片面排风两大类。片面排风是将污染物当场捕集、净化后排放室外。片面送风是将始末处理的、契合要求的空气送到片面作业当地，以确保片面区域的空气条件。片面通风办法作为确保作业和生计环境空气品性、防备室内环境污染的技艺对策应优先研究。

One-sided ventilation system is divided into one-sided air supply and one-sided exhaust. One-sided exhaust is to capture and purify pollutants on the spot and then discharge them to the outside. One-sided air supply is to send the air that meets the requirements from the beginning to the end to the one-sided operation area to ensure the air conditions in the one-sided area. The one-sided ventilation method should be given priority as a technical countermeasure to ensure the air quality of the working and living environment and prevent indoor environmental pollution.

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