又硬又粗进去好爽A片春色视频,大量国内自拍AV手机观看,99re这里只有国产中文精品国产精品,人妻无码AV一区二区三区

In the hot summer, the pig farm must use the cooling equipment in the pig farm to ventilate and cool the pig farm to ensure smooth ventilation and healthy growth of pigs. Here are some common cooling equipment in the pig farm.
1、 Negative pressure fan is generally used in airtight breeding, pregnancy and delivery room. Through the operation of the fan, the air in the house is driven to generate air flow, which can discharge the heat, harmful gas, dust, etc. in the house and bring in the fresh air outside the house. Pay attention to the relationship between the length of pigsty and the number of installed fans.
2、 Wet paper curtain wet paper curtain is mainly through the evaporation of water to take away the heat of air through the wet paper curtain. It should be used in the closed pigsty and cooperate with the negative pressure fan. The reasonable use of negative pressure fan and wet paper curtain can effectively reduce the temperature of the pigsty by about 3 ℃.
3、 The spray head is installed in the house. The temperature in the house is reduced rapidly by evaporation of atomized water. It is generally used intermittently during the peak temperature period. It needs to be used with a fan or fan. The disadvantage is that the temperature is kept for a short time, and the humidity in the room will be too high if it is used for a long time. Generally, it can reduce 4-5 ℃. The sprinkler can also be installed on the roof, and the effect of long-term use is also good, but the water demand is relatively large, and it is difficult to use in the pig farm where water is tight.
4、 The industrial fan uses the fan to cool down in the open type pig type. The air volume of the fan is large and the cooling effect is obvious. However, due to the long-time operation, it is easy to cause the head wear, and the area it can affect is small. Compared with the negative pressure fan, if the same effect is achieved, the required power is large and is gradually replaced by the negative pressure fan.
Five, foam board installed in the house to install foam ceiling to achieve the purpose of insulation, all kinds of pig houses can be used, the effect is good.
6、 When the temperature of water pump and rubber hose is high, it can also wash the pig body, the ground and the bottom of the fence to achieve the purpose of cooling, but the water demand is relatively large, which may cause certain pressure on the environmental protection ditch. In the long run, planting trees around pigsty is an economic and effective way.