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First we are going to introduce you to SPX Cooling Technologies and then we will talk about choosing the right cooling tower and avoiding common mistakes. We will also cover specialized topics like free cooling and selecting towers for low sound.
A cooling tower is a type of heat exchanger where air and water are brought into direct contact with each other to effect the transfer of heat.
Heat is removed primarily through evaporation which, on an average system, results in about 1% of the circulating flow rate.
There are two types of cooling that occur in a cooling tower – sensible and latent heat transfer.
Sensible heat transfer occurs when a warm body comes into contact with a cooler body. An example would be putting your hand on a desk. Heat is transferred from the warm hand to the cool body.
It’s not nearly as efficient as latent cooling, which involves the change of state of the water from a liquid to a gas. An example of this is perspiration – a small amount of water evaporates off your skin, which results in a significant amount of cooling for the body.
There are several ways to reduce sound from a cooling tower. The simplest is to oversize the box. There are two factors in accomplishing cooling in a cooling tower – surface area and the amount of air going through it. The least expensive option is always a relatively small box with a large motor and a lot of air going through the box. The usually results in the loudest and least expensive option. Thus, by going with a larger box with a smaller motor, you have the result of a quieter, more efficient tower.
There are other options as well, including low noise fans, attenuation, and Ultra low-noise fans, and these will be discussed on the following slides.