Question: Which Type Of Cooling Tower Is More Efficient?

How can we increase the efficiency of a cooling tower?

How to Improve Water Efficiency on Your Cooling TowerPiping Change.

Simple repairs like a change to the water piping can help you mange your energy consumption.

Focus on Recycling.

Periodically Inspect all Equipment.

Increase Cooling Cycles..

What are the different types of cooling towers?

The types of cooling towers based on the air flow generation are Natural draft, Mechanical draft, Cross-flow and Counter-flow towers.Natural Draft cooling towers use the design and shape of the tower itself to move up the air naturally using fans. … Mechanical Draft towers tend to use a fan to force the air.More items…•

What is blowdown loss in cooling tower?

Cooling tower bleed-off/blowdown is the flushing of a portion of high mineral concentration cooling tower system water down the drain, while simultaneously replacing it with fresh water. This process dilutes the system water mineral concentrations that steadily increase due to water evaporation.

What causes scaling in cooling towers?

Scale deposits form when the solubility of dissolved minerals in the cooling water is exceeded. Cooling towers function by evaporating a percentage of the water into the atmosphere.

What are the parameters affect to performance of cooling tower?

Several parameters as Cooling range, Wet bulb temperature, Mass flow rate of water, Tower height, Air velocity through tower and many other things that affect the performance of cooling tower. For a good designer all this parameter would want to mind for proper designing and functioning of cooling tower.

What is the percentage of evaporation loss in cooling tower?

As air rises inside the tower, it receives the latent heat of vaporization from the water, and thus the water is cooled. As a rule of thumb, for every 10°F (5.5°C) of water cooling, 1% total mass of water is lost due to evaporation.

What are spray nozzles used for on a cooling tower?

Spray nozzles with plate are used to distribute water in wet cooling towers. Cooling towers are evaporative heat rejection devices, which take out the waste heat to the atmosphere through the cooling of water by the air.

Why are biocides added to cooling tower water?

Why are biocides used in cooling water? Biocides are used to control bacteria in cooling water systems. Failure to implement a good cooling water biocide program may lead to bacteria and under deposit corrosion.

How cold can a cooling tower get?

In colder climates, many designers and operators are concerned with operating cooling towers in subfreezing temperatures. By following some simple operating guidelines, cooling towers can and have been successfully operated in very cold climates (-15°C / 5°F) as shown in the photograph at right.

How do cooling towers reduce water temperature?

The decrease in the outlet water temperature by using water path cooling is proved by the conventional heat transfer formulae. The second method deals with the decrease the liquid to gas flow ratio(L/G) by increasing the air velocity with the help of cylinder blocks near the louvers of cooling tower.

What is the efficiency of cooling tower?

In practice, the cooling tower efficiency will be in between 70 to 75%.

Which of the cooling tower has highest efficiency?

The film type of fill is the more efficient and provides same heat transfer in a smaller volume than the splash fill. Cold water basin: The cold water basin, located at or near the bottom of the tower, receives the cooled water that flows down through the tower and fill.

How do you calculate air flow in a cooling tower?

The formula is total heat removed (11.2) times pounds per minute of air (6.95) times 60 minutes per hour. 11.2 X 6.95 X 60 = 4, 670.4 BTU/Hr. Therefore, a tower with a 100 CFM motor at these conditions would be removing 4,670.4 BTU/Hr.

What is the lowest temperature a cooling tower can produce?

For exam- ple, at 35°F (1.6°C) dry bulb, above commonly assumed freezing conditions, the wet-bulb temperature often can be less than 32°F (0°C) wet bulb—and the water flowing over a cooling tower can freeze without proper operation.

What is the function of cooling tower?

A cooling tower is designed to remove heat from a building or facility by spraying water down through the tower to exchange heat into the inside of the building.

What are the two types of cooling towers?

There are three main types of cooling towers that are defined by how water or air pass through them. These types include crossflow, counterflow, and hyperbolic. There are also two varieties classified solely on airflow, known as induced draft and passive draft cooling towers.

Is a cooling tower a condenser?

A cooling tower is used to cool water and is a huge heat exchanger, expelling building heat into the atmosphere and returning colder water to the chiller. A cooling tower receives warm water from a chiller. This warm water is known as condenser water because it gets heat in the condenser of the chiller.

What is COC cooling tower?

COC or the Cycles Of Concentration is an abbreviation, used when talking about cooling water or cooling tower water. The COC specifies, how often a fresh water added into the loop, can be used or pumped around, before the water has to blown down or bleed off from the cooling tower.

What is difference between scaling and fouling?

When cooling systems operate, water with fouling factors flow through the system: Hard water causes scaling, whereas seawater can cause biofilm, or growth of micro and macro species. … As fouling increases, two things occur: First, the volume of water that can flow through the heat exchanger is reduced.

What is TR capacity in cooling towers?

Chiller Refrigeration Tons Some commercial and industrial refrigeration systems are rated in Tons of Refrigeration (TR, tons). A ton is the amount of heat removed by an air conditioning system that would melt 1 ton (2000 lbs.) of ice in 24 hours. The heat required to melt 1 lb of ice at 32 oF to water is 144 Btu.

What two types of fan are used for cooling towers?

Mechanical draft cooling towers Common fans used in these towers include propeller fans and centrifugal fans. Mechanical draft towers are more effective than natural draft towers, and can even be located inside a building when exhausted properly.

What is TDS cooling tower?

Cooling towers are used within some businesses for process water cooling or as part of an air-conditioning system. … ‘Bleed’, ‘blow-down’ or ‘dump’ cycles – as water is evaporated, concentrations of total dissolved solids (TDS) increase which is detrimental to the efficient operation of the unit.

What is the temperature of cooling tower water?

A nominal cooling tower ton is defined as the capability to cool 3 GPM (0.19 lps) of water from a 95ºF (35.0ºC) entering water temperature to an 85ºF (29.4ºC) leaving water temperature at a 78ºF (25.6ºC) entering wet-bulb temperature.

How do you evaluate cooling tower performance?

The approach temperature is one of the two important parameters for evaluating cooling tower performance. It usually ranges from 3 to 5⁰C, i.e. if the cold water temperature approaches the Twb by 3-5 ⁰C, the operation of the cooling tower is considered satisfactory.