What Is The Special Negative Pressure Fan For Greenhouse And What Are The Advantages Of The Negative

In the greenhouse, our common square iron shell fan is a negative pressure fan. Let's give you a scientific overview of the use and advantages of the negative pressure fan?

1、 Introduction to Negative Pressure Fan

The negative pressure fan is a process that uses the air convection principle, the motor drives the fan to rotate to exhaust the indoor air out of the room and form a negative pressure inside the greenhouse. The outdoor air enters the room under the pressure, so the fan is called negative pressure fan.

2、 Model of negative pressure fan commonly used in greenhouse

1. Size and model

The negative pressure fan models used in greenhouse applications are 1380 and 1530, which are also the outer diameter dimensions of the fan, namely 1380mm and 1530mm in length and width, and 400mm and 450mm in thickness. The opening method of the 400mm fan shutter is to use the air volume to blow open, while the 450mm fan shutter is opened by a push pull device. Therefore, a 400mm thick fan is also called a heavy hammer fan, and a 450mm thick fan is also called a push-pull fan.

2. Exhaust air volume

The theoretical air volume of 1380 * 1380mm negative pressure fans is mostly between 44000 and 46000 cubic meters per hour; The theoretical air volume of negative pressure fans with a size of 1530 * 1530mm is mostly between 48000 and 50000 cubic meters per hour.

3、 Application of negative pressure fan in greenhouse

1. Number of installed fans

The application of fan in greenhouse is mainly to cool down with water curtain. Therefore, we need to use the number of supporting fans in conjunction with the installation theory of fan water curtains. The air exchange principle to be followed is to exchange air in the shed once within two minutes to calculate the number of fans.

2. Installation position of the fan

The normal direction of the multi span greenhouse is north-south, and the fan is installed on the south elevation. The installation height is usually in the middle of the greenhouse, and should not be too low because hot air is concentrated in the upper part, but it cannot be installed at the top. We also need to consider the problem of the cold air path entering the opposite water curtain.