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Evaporative cooling

Innovative and versatile evaporative cooling controls for direct or indirect evaporative cooling systems

Phason has been designing and building electronic controls for over 18 years. Our newest control, the ECC-1 Evaporative Cooling Control is built to the same high-quality standards as all our controls. As usual, we designed the ECC-1 with the user in mind. That means we put a lot of time into features that make it versatile, cost-effective, and easy to use.

What is evaporative cooling?

There are two types of evaporative cooling: direct and indirect. Both methods can be used in either mechanically or naturally-ventilated facilities. A typical evaporative cooling system contains a water pump (for building and maintaining water pressure), sprinklers (for soaking or misting/fogging), fans (if the system is mechanically-ventilated), and a control system.

The process of operating the sprinklers (soakers or misters/foggers) is called a 'soak duration' or 'mist duration', depending on the mode being used. The process of operating all the sprinklers in sequence for their soak/mist durations and then evaporating the moisture, either naturally or mechanically, is called a cooling cycle.

Direct evaporative cooling—used in soaking

Direct evaporative cooling is achieved by evaporating water from the surface of an object, such as the hide of an animal.

Using dairy or swine as an example, sprinklers shower the animals for a short duration (long enough to wet the hides). Air being drawn across the backs of the animals causes evaporation. The energy/heat required to evaporate the water cools the animals.

Indirect evaporative cooling—used in misting/fogging

Indirect evaporative cooling is achieved by evaporating water vapor in the air. Water vapor is placed in the air by misters or foggers. As the tiny water droplets evaporate, they remove heat from the air. Indirect evaporative cooling is commonly used in greenhouses, but can also be used in livestock buildings or poultry houses.

Evaporative cooling reduces heat stress in livestock

Studies have shown that the effects of heat stress cost North American livestock producers billions of dollars each year. Heat stress is caused by a combination of high temperature, humidity, and solar radiation. Heat stress causes livestock health problems and other negative effects, including:

• decreased feed consumption
• reduced milk production in dairy cows
• reduced reproductive efficiency
• increased mortality

Evaporative cooling systems have been shown to significantly reduce heat stress in livestock.

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