Weak current College】 【what is negative pressure ventilation cooling?.

Since that negative pressure ventilation (cooling, the same below), we will certainly have positive pressure ventilation. Our first talk about the positive pressure.

Common positive pressure ventilation cooling generally refers to the central air conditioner, air conditioning and environmental protection air conditioning tank. The first two air conditioners are familiar to most people, mainly in the confined space, to release the cold air in and original hot air, ventilation and cooling compared to passive, rate is also very limited. Therefore often cause the air very boring and dull is hypoxia. Another flaw is to use the air conditioning needs additional moisture or human skin will shrink. We often say air conditioning sickness, which is the body and skin shrinkage, and even some human eyes will dry, itchy, throat going bad.

The second positive pressure ventilation is environmental protection air conditioning and refrigeration by fans and waterfall, cold air through a pipe into the Interior, and central air conditioning, Cabinet air conditioner, it is also an increase in the Interior, as in the cold and hot air reaches the cooling effect. And these two air conditioning, this kind of ventilation system does not need to close the doors and Windows, the proliferation of indoor air automatically. So the ratio of these two air conditioning air quality will be better, no refrigerant, environmental protection air conditioning so.

Negative pressure ventilation prerequisite is relatively closed space. Wall side of negative pressure fan forced out of the indoor air, will form the instantaneous relative vacuum (suction), the other side wall installation of water curtain has many small holes, outdoor air at atmospheric pressure (do not underestimate the atmospheric pressure, the pressure is great in fact, we feel it is because we adapt to this kind of pressure) automatically flow into the Interior. Therefore air continuously and outdoor cycling. If you installed all right, indoor air will participate in this cycle. So dirty, smoke, dust, odor in the room, the most thorough ventilation mode. Taking into account the input costs, some customers will simply select the vacuum fan, without installing the cooling water curtain. At this point the air through the fan on the opposite side of the door and Windows, no cooling. Indoor air flow will also have a good cooling effect.

Our first talk about the axial fan. This is called positive-pressure fans may wish to. It is like high pressure taps, lift and pressure is one of important indicators. Which fan for air volume is generally very small, about 1KW power, also about the 10000M3/H. For blowing effect is pretty good. Standing opposite the fan, will feel powerful airflow. But the effect for ventilation is poor.

We have had many customers of high temperature plant is installed, there is a wide range of axial fans. But the workshop is still so stuffy, or so much dust and smell. Why? if we stand on the side of axial axis, you simply do not feel the air flow, while the axis has a lot of wind. His flow is straight. For the surrounding air rarely led. As high pressure sprinkler, standing at the side of the flow, you will not be wet.

And negative pressure blower is different. Suction fan like the reverse of sprayers, it is on the air absorption and Bugle shape not only drives the fan airflow, and the axis is determined by the fan in the Bugle-scroll the air, we stood next to the fan will feel the axes to powerful airflow. It's this feature determines its thorough and exhaust efficiency.

Another very important point, installation of negative pressure fan, fan-side of the wall must be well sealed. Especially the fan cannot have void around. We often see many customer installation of many negative pressure fan, but the workshop is still very close, they then concluded that the vacuum fan also has no effect. I went to see a lot of the scene, often is a very large Windows, install a typhoon machine, the fan will open next to the window sash. It is conceivable that a large number of air was only peripheral circulation fan, of course, cannot absorb air workshop in the distance.

Install the ideal vacuum fan, fan side walls and the doors and close all nearby, opposite walls and doors fan open to guarantee the flow of air straight line. If the fan side wall window to open, then the farther away from the fan, the better to fully guarantee the airflow from the fan into the opposite.