Cowshed Suspended Direct-connected Fan

Fans for use in dairy barns come in a variety of different sizes, shapes, function and materials. While most fan manufacturers offer fans that range in size from 36 inches to 84 inches in diameter, there are some even larger than that. When looking at the variety of fan sizes, the differences in shape soon become apparent. Options range from round panel fans, box fans, exhaust fans, high-volume low-speed (HVLS) fans and basket fans. Each different shape and style of fan is meant to serve a different function. Add in the fact that there are many different materials used in building these fans, and it seems like an impossible task to select one fan over the other.

The first thing to understand is that there are two main types of fans – exhaust-style fans and circulation-style fans. Exhaust fans are used to pull or draw air through a space using negative pressure, and circulation fans are used to move air within a required space. Each of these fan types has specific and different requirements to be effective and efficient at the job they are designed to accomplish, which can be objectively tested and measured.

One of the key tests for exhaust-style fans is to measure their airflow in cubic feet per minute (CFM), and energy consumption in watts, at various levels of static pressure. We can then use this to give the fans an efficiency rating of CFM/watt at the different pressure levels. When comparing different exhaust fans and their efficiency ratings, airflows and power usage, the range of these values can seem overwhelming at first. However, once we remember different fans are designed for different purposes, the variance in these numbers makes much more sense. Some fans are designed to move as much air as possible, some are designed to be as efficient as possible and some are designed to achieve a certain performance at a very specific pressure value. So, when comparing exhaust fans, it is important to understand what your requirements are.

When we look at recirculation fans, they are tested in a different manner, since they are built to achieve a different result. Recirculation fans are tested on how much air they move in thrust CFM. This is tested and measured by having the fan blow against a load cell. The fan's power consumption can also be tested, allowing it to get an efficiency rating of thrust CFM/watt. The airspeed at a distance of five times the diameter is also tested, which provides an indication of the distance the fan can throw the air.

The Air Movement and Control Association (AMCA) sets testing procedures and requirements for fans. This ensures that all fans are tested to the same standards and use the same methods so that we can get a true comparison. So, when comparing different fans, it is imperative to get independent lab-tested data. It is also important to note which AMCA standard the data was tested to, as the testing methods and technologies have changed over the years.

The cowshed suspended direct-connected fan expels air outward, causing a decrease in indoor air pressure and thinning of indoor air. The characteristics of the animal husbandry fan form a negative pressure zone, and the air flows into the room due to pressure difference compensation. In practical applications in cowshed, cowshed suspended direct-connected fan are installed centrally on one side of the cowshed building, with the air inlet located on the other side of the cowshed building. The air flows from the air inlet to the animal husbandry fan to form convective blowing. During this process, the doors and windows near the livestock fan remain closed.

Some cowshed suspended direct-connected fan have motor holes and wind deflectors to prevent air loss and achieve good air collection effect. Aviation aluminum alloy wheels are lightweight, high strength, good toughness, and non fracture;

The main structure of the cowshed suspended direct-connected fan: The fan is mainly composed of blades, motors, outer frames, protective nets, support frames, louvers, and other components. The motor drives the blades to generate airflow, and the movable louvers can be equipped according to user needs. After starting, the louvers can automatically open, and when stopping, the louvers can automatically close to prevent outdoor dust, foreign objects, etc. from entering, and can also avoid the impact of rain, snow, and wind reversal.