Mike Czarick

In a negative pressure-ventilated poultry house, the amount of air entering through each side wall inlet depends primarily on the level of negative pressure generated by the house exhaust fans, the size of the inlet opening, and the air inlet design. The higher the static pressure, the faster the air will enter the house and the greater the amount of air that will enter through an inlet. Not surpr ...

It is well known that the higher the static pressure, the faster the air will enter through an air inlet and therefore the greater the amount of air which will enter through the inlet. But how precisely does velocity change with pressure and similarly how does the amount of air entering through an inlet change with static pressure? To answer these questions, the performance of typical 44" X 7" (42 ...

Though it may not seem like it, each one-foot section of a five-foot-tall, six-inch pad has a tremendous surface area... well over 300 square feet. As a result, a house with two 70' X 5' evaporative pad systems has over 42,000 square feet of pad surface area from which water can evaporate and cool the incoming air. When we look at a 70' X 5' pad system, we can only see the 350 squa ...

A 54" tunnel fan with a 1.5-hp motor is running and consuming 1,700 watts of power. The belt suddenly breaks and the fan blades stop rotating, but the motor continues to spin. How much power do you believe the motor is now consuming? 1,700 watts? It is important to understand that the primary factor determining how much power a fan will use is how fast the motor is spinning the prop. The faster th ...

When building a new house or retrofitting an older one, tunnel fan selection is one of the most, if not the most important decision a producer has to make. A house’s fans are essentially the engine of the ventilation system and as a result have a significant effect on a producer’s ability to maintain the proper environmental conditions throughout the year. Furthermore, with rising elec ...

A poultry house controller's temperature sensors are, in a sense, its "eyes" enabling it to “observe” what is happening throughout a poultry house so it can accurately determine what equipment it needs to operate to maintain the proper environmental conditions throughout a house. As a result, a controller’s ability to maintain proper growing conditions for the birds is only a ...

When designing a tunnel-ventilated house, it is important to install the proper amount of evaporative cooling pad. Too little pad will result in excessive static pressure, which will reduce air speed, and therefore bird cooling. Too much pad will result in increased initial cost, more pads to maintain/replace, and a larger area of reduced air movement near the tunnel inlet end wall.Pad area is bas ...

Using evaporative cooling to keep birds cool during hot weather is relatively simple. Water is circulated over paper pads. Tunnel fans pull hot outside air through the pads and into the house. As the air moves through the wetted pads, its temperature decreases. Fairly straightforward. On the other hand, understanding how evaporative cooling pads lower the temperature of the incoming air can be rat ...