Cooling towers may not be as mainstream and popular as air conditioning units with compressors in them, but they are as effective as any other cooling equipment out there. The truth is a cooling tower works by rejecting heat in an environment. It does the job by getting rid of waste heat, thereby throwing it to the atmosphere by way of cooling a water stream to a low temperature. Cooling towers come in two distinct modes of operation. For instance, there is a variety that uses evaporation of water, while another one is designed to take advantage of air to cool down the working fluid. The first mechanism uses the evaporation of water to remove the heat from the process and eventually cool down the working fluid. The second – usually referred to as the closed-circuit dry cooling tower, depends on air to cool the working fluid.
There are several applications and uses for cooling towers, including that of cooling the circulating water found in oil refineries, petrochemical plants, as well as thermal power stations and HVAC units in cooling buildings and structures. The way to differentiate cooling towers from one variety to another is through the type of air induction utilised. Today, the two primary types are a natural draft and the induced draft cooling tower.
Furthermore, cooling towers may also differ in size, so depending on the use, you can have a choice. For instance, you will see a small rooftop unit and another one like a hyperboloid structure that is about 200 metres high and a diameter that can go up to 100 metres.
Also, cooling towers may likewise be classified based on build. In this regard, the two varieties are called the field erected cooling tower and the package cooling tower. The package type of cooling tower comes pre-assembled, which means they also are convenient to transport using a truck or van. However, the packaged variety has limited capacity, which is why it only is commonly used in facilities with low or moderate heat rejection requirements. Some establishments where you see the use of the package type of cooling tower are textile plants, food processing plants, as well as typical buildings like hospitals, malls, and hotels.
On the other hand, the field erection type of dry cooling tower is common in facilities like large steel processing plants, refineries and petroleum plants, and petrochemical plants. You see this variety in large structures due to their higher capacity with regards to heat rejection. You expect a field erection type to be bigger than the package type variety. Likewise, you see them with pultruded fibre-reinforced plastic structure, cladding, drift eliminator, fill, and for the most part, a mechanical unit for air draft.