1. There are many ways to classify the ventilation system. According to different ways of classifying, there are different titles.

　?。?）按通風體系的動力來分

　　(1) According to the power of ventilation system

　　通風方法按照空氣活動動力的不同，2能夠分為天然通風和機械通風兩大類。

　　Ventilation methods can be divided into natural ventilation and mechanical ventilation according to the different dynamic forces of air activity.

　　1) 天然通風

　　1) natural ventilation

　　天然通風原理如圖2-1所示。天然通風是依托室表里溫差所構成的熱壓，或者室外風力的效果在建筑物上構成的壓差，使室內的空氣進行交流，從而改善室內空氣環(huán)境。

　　The principle of natural ventilation is shown in Fig. 2-1. Natural ventilation relies on the thermal pressure formed by the temperature difference between the surface and the inside of the room, or the pressure difference formed by the outdoor wind effect on the building, so that the indoor air can be exchanged and the indoor air environment can be improved.

　　2) 機械通風

　　2) mechanical ventilation

　　使用通風機所發(fā)生的動力，使室表里空氣進行交流的通風方法為機械通風。其長處是：通風量、風壓不受室外氣象條件的約束，通風比較穩(wěn)定，對空氣處理比較方便，通風調理比較靈敏。

　　Mechanical ventilation is the ventilation method that uses the power generated by the ventilator to make the air in the room surface communicate. Its advantages are: ventilation volume and pressure are not constrained by outdoor meteorological conditions, ventilation is relatively stable, air treatment is more convenient, ventilation conditioning is more sensitive.

　　2. 按通風體系的效果規(guī)模劃分

　　2. Classification of ventilation system according to its effect scale

　　按通風體系的效果的巨細，通風方法可分為部分通風和通風。

　　According to the effect of the ventilation system, the ventilation method can be divided into partial ventilation and comprehensive ventilation.

　　1) 部分通風

　　1) partial ventilation

　　使用部分的送、排風操控室內部分地區(qū)的污染物的傳達或操控部分地區(qū)的污染物的傳達或操控部分地區(qū)的污染物濃度達到衛(wèi)生標準要求的通風叫做部分通風。部分通風又分為部分排風和部分送風。

　　It is called partial ventilation that uses partial air supply and exhaust to control the transmission of pollutants in some areas of the room or to control the transmission of pollutants in some areas or to control the ventilation whose pollutant concentration meets the requirements of sanitary standards in some areas. Partial ventilation is divided into partial exhaust and partial supply.

　　①部分排風

　　Part of exhaust air

　　部分排風是在集中所發(fā)生有害物的部分地址，設置有害物捕集設備，將有害物質就地排走，以操控有害物質向室內分散。部分排風體系如圖2-2所示。

　　Part of the exhaust air is located at some sites where harmful substances are concentrated. The equipment for collecting harmful substances is set up to remove harmful substances in situ so as to control the dispersion of harmful substances into the room. Part of the exhaust system is shown in Fig. 2-2.

　?、诓糠炙惋L

　　Partial air supply

　　部分送風方法是使用通風機和風管，直接將室外新鮮空氣或者通過處理后具有一定參數(shù)的空氣送到作業(yè)地址。煉鋼、銹造等高溫車間常常選用這種通風方法。

　　Part of the air supply method is to use ventilators and ducts to directly send outdoor fresh air or air with certain parameters after treatment to the work address. This ventilation method is often used in high temperature workshops such as steelmaking and rusting.

　　2） 通風

　　2) comprehensive ventilation

　　通風是對整個房間進行通風換氣。通風包括排風，送風和送、排風。

　　Full ventilation is to ventilate the whole room. All-round ventilation includes all-round ventilation, all-round air supply and all-round air supply and exhaust.

　　①排風

　　Full ventilation

　　排風是從整個房間掃除有害物質的通風方法，為了使室內發(fā)生的有害物盡可能不分散到其它區(qū)域或領室去，能夠在有害物比較集中發(fā)生的區(qū)域或房間選用機械排風。圖2-4位機械排風體系，圖2-4（a）是在墻上裝有軸流風機的簡略排風體系。

　　Full ventilation is a ventilation method to remove harmful substances from the whole room. In order to prevent harmful substances from dispersing to other areas or Consulates as far as possible, mechanical ventilation can be used in areas or rooms where harmful substances are concentrated. Figure 2-4 is the simplest comprehensive mechanical exhaust system with an axial-flow fan installed on the wall.

　?、谒惋L

　　Full air supply

　　把符合衛(wèi)生要求的空氣送到整個房間各個部位的送風體系稱為送風。能夠通過天然通風和機械通風來完成。機械送風體系如圖2-5所示，通過處理后的空氣，在風機的效果下，經風管、送風口送入整個房間的各個部位，而排風可通過排風口或門窗排出。

　　The air supply system that delivers the air that meets the hygienic requirements to all parts of the room is called comprehensive air supply. It can be accomplished by natural ventilation and mechanical ventilation. The comprehensive mechanical air supply system is shown in Figure 2-5. Under the effect of the fan, the treated air is fed into all parts of the room through air ducts and air outlets, and the exhaust air can be discharged through air outlets or doors and windows.

　　③送、排風

　　(3) Full air supply and exhaust

　　在門窗緊閉，天然排風或進風比較困難的房間，常選用圖2-4所示排風和圖2-5所示的送風相結合的送、排風體系。

　　In rooms where doors and windows are closed and natural ventilation or intake is difficult, a comprehensive air supply and exhaust system combined with comprehensive air supply shown in Figure 2-4 and Figure 2-5 is often used.