通風(fēng)管道的機(jī)械通風(fēng)的原則有哪些？

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1、稀釋通風(fēng)

1. Dilution ventilation

稀釋通風(fēng)又稱攙雜通風(fēng)，即送人比室內(nèi)污染物濃度低的空氣與室內(nèi)空氣攙雜，以此下降室內(nèi)污染物的濃度，抵達(dá)衛(wèi)生標(biāo)難。

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、置換通風(fēng)

2. Displacement ventilation

在置換通風(fēng)體系中，鮮美冷空氣由房間底部以很低的速度送入，送風(fēng)溫差僅為2—4Y。送入的鮮美空氣因密度大而像水相同彌散悉數(shù)房間的底部，熱源導(dǎo)致的熱對流氣流使室內(nèi)發(fā)生筆直的溫度禪度，氣流遲緩上升，脫節(jié)作業(yè)區(qū)，將余熱和污染物推向房間頂部，由設(shè)在頂棚上或房間頂部的排風(fēng)口直接掃除。

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.

室內(nèi)空氣近似活塞狀活動，使污染物隨空氣活動從房間頂部掃除，作業(yè)區(qū)根本處于送入空氣中，即作業(yè)區(qū)污染物濃度約等于送人空氣的濃度，這是置換通風(fēng)與傳統(tǒng)的稀釋全盤通風(fēng)的很大別離。在通風(fēng)管道中，顯著置換通風(fēng)的通風(fēng)成效比稀釋通風(fēng)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、片面通風(fēng)

3. One-sided ventilation

片面通風(fēng)便是欺詐片面氣流，使片面當(dāng)?shù)夭皇苡泻ξ锏奈廴?，?gòu)成優(yōu)異的空氣環(huán)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.

片面通風(fēng)體系分為片面送風(fēng)和片面排風(fēng)兩大類。片面排風(fēng)是將污染物當(dāng)場捕集、凈化后排放室外。片面送風(fēng)是將始末處理的、契合要求的空氣送到片面作業(yè)當(dāng)?shù)?，以確保片面區(qū)域的空氣條件。片面通風(fēng)辦法作為確保作業(yè)和生計(jì)環(huán)境空氣品性、防備室內(nèi)環(huán)境污染的技藝對策應(yīng)優(yōu)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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