What are the disadvantages of air cooled condenser?

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An air-cooled condensers work by transferring heat from a refrigerant or other working fluid to the surrounding air, using a series of tubes or coils that are exposed to a flow of air. The process involves several steps:

1. The hot refrigerant or working fluid enters the condenser, where it flows through a network of tubes or coils.
2. As the hot fluid flows through the tubes, a fan or fans draw air through the coils, which removes heat from the fluid.
3. As the air passes over the coils, it absorbs the heat from the fluid and becomes warmer.
4. The now-cooled fluid leaves the condenser and continues through the cooling system, while the warm air is discharged to the atmosphere.

By continuously transferring heat from the fluid to the air, an air-cooled condenser can effectively cool the fluid. This allows it to be used in a variety of applications, including air conditioning and refrigeration systems.

Air cooled condenser types

Air-cooled condensers come in two main types, induced draft and forced draft, which differ in how they move air through the condenser.

1. Induced draft air-cooled condenser

In this type of condenser, the fans are located at the top of the unit and pull air through the condenser. The air flow is induced by the negative pressure created by the fans, hence the name "induced draft". The steam enters the top of the condenser and flows downward through the tubes, while ambient air is drawn in through the bottom of the unit and moves upward over the tubes. Induced draft air-cooled condensers are typically used in larger power plants and can handle a high volume of steam.

2. Forced draft air-cooled condenser

In this type of condenser, the fans are located at the bottom of the unit and push air through the condenser. The air flow is forced by the positive pressure created by the fans, hence the name "forced draft". The steam enters the bottom of the condenser and flows upward through the tubes, while ambient air is forced in from the top of the unit and moves downward over the tubes. Forced draft air-cooled condensers are typically used in smaller power plants and can handle a lower volume of steam.

Advantages of air cooled condenser

Air-cooled condensers have several advantages over other types of condensers, including:

• Lower Water Consumption: Air-cooled condensers do not require a constant supply of water for cooling purposes, as opposed to water-cooled condensers. This means that they are an excellent option for areas where water is scarce or expensive.
• Low Maintenance Costs: Air-cooled condensers require less maintenance compared to water-cooled condensers, as they don't need to be cleaned regularly and don't have to deal with issues related to water treatment.
• Flexibility in Location: Air-cooled condensers can be located anywhere, as they don't require a nearby source of water. This makes them a popular option in remote areas or in situations where there is limited space.
• Lower Initial Cost: Air-cooled condensers are typically less expensive to install than other types of condensers. They also do not require expensive pumps, water towers, or other water-related infrastructure.
• Environmentally Friendly: Air-cooled condensers do not consume water, making them more environmentally friendly than water-cooled condensers. Additionally, they do not contribute to the growth of harmful bacteria or algae in water, which can be a problem in some water-cooled systems.

Disadvantages of air cooled condenser

While air-cooled condensers have several advantages, they also have a few disadvantages, including:

• Lower Efficiency: Air-cooled condensers are generally less efficient than water-cooled condensers. This is because the temperature difference between the refrigerant and the air is typically smaller than the temperature difference between the refrigerant and the water.
• Higher Operating Costs: Because air-cooled condensers are less efficient, they may require more energy to operate than water-cooled condensers. This can result in higher operating costs over time.
• Noise: Air-cooled condensers can be noisy, especially when they are located close to residential or commercial areas. This noise can be a nuisance to nearby residents or workers.
• Limited Capacity: Air-cooled condensers have a limited capacity compared to water-cooled condensers. This means that they may not be suitable for larger commercial or industrial applications.
• Maintenance Issues: While air-cooled condensers require less maintenance than water-cooled condensers, they may still require regular cleaning to prevent dirt and debris from accumulating on the fins or coils. This can be more challenging in dusty or dirty environments.

Water cooled evaporative condensers are often applied in larger industrial installations

Air cooled condensers can be more cost-effective in their standard smaller configurations

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Ed Whinyates of Stonegrove Refrigeration looks at some of the things to consider when it comes to choosing a condenser.

A refrigeration system needs a condenser in some form or another. Traditionally, the application of an air cooled condenser was preferred for small to medium installations, with evaporative condensers the preferred choice for medium to large installations. However, as technology has developed, this is now not always the case. 

Evaporative condensers and air cooled condensers have their own distinct advantages and disadvantages so, when selecting the best option for a refrigeration project, a number of factors need to be considered. These include (but are not limited to) size of project, available space, cost, energy efficiency and on-going maintenance.  

It is not possible to offer a definitive answer to which option is best, as there are many different aspects to consider in terms of performance and choice.

The application of water cooled systems has been used for many years and is notably prevalent on larger industrial installations. There are a number of advantages to selecting a water cooled condenser. 

It has been argued that they have better energy efficiency compared to air cooled condensers. This is due to the more efficient transfer of heat, leading to savings on energy costs and consumption. In addition to this, there are fewer exposed parts with evaporative condensers which makes them less vulnerable – making the case for their longer lifespan and the less frequent need for replacement. Evaporative condensers are also praised for their operational performance in higher temperature environments.  

When installing refrigeration equipment, the footprint of the pad, plant room or enclosure will impose on a client’s available space. Evaporative condensers don’t have the need for plenty of fresh air to operate correctly and can be sited (within reason) anywhere. From an external environment perspective there is the advantage of having a quieter operation. Evaporative condensers don’t have the ducts and vents of an air cooled condenser so there is not the same concern over noise pollution.     

Nonetheless there are some potential disadvantages to Evaporative condensers. One of these is cost. It is argued that because of the greater number of mechanical parts needed, such as cooling towers and pumps, it is a more expensive installation option.  There is also the requirement for more intense on-going maintenance and regular water treatment which add to the continued costs.  There is also the high cost and quality of water along with the requirement for a water supply.  However the case can be made that the longer lifespan and energy savings, associated with water cooled condensers, make them cost effective longer term.  Another disadvantage is the high water usage which, unfortunately, cannot be avoided.

There are a number of specific advantages to the use of air cooled condensers. Typically air cooled condensers are a more cost-effective option to install and maintain compared to water cooled condensers in their standard smaller configurations.  When looking at smaller installations, the choice of an air cooled condenser tends to be favoured offering a wider application for their use. They also provide more options for refrigeration systems at the design phase of a project. A good example of this is the increased use of packaged chillers on many industrial refrigeration applications. The knock-on effect for this kind of system is the benefit to both installation programme reduction and commissioning time on site.

Air cooled condensers don’t rely on a water to cool and so are not restricted by water availability. Also, due to the need for fewer parts, the risk of breakdown is reduced which means less on-going maintenance costs. This in turn leads to less downtime and greater reliability of the plant. Maintenance plays an extremely important part of any refrigeration system so this cannot be overlooked when making an important capital decision.  

Environmental impact has become far more relevant with refrigeration systems, with the ever-changing face of HFCs and the move towards a greater use of natural refrigerants. Air cooled condensers also play a positive role in this as there is no requirement for water, so no water wastage or the need for chemical dosing.

Like evaporative condensers, the use of air cooled condensers has some disadvantages. The footprint required to take the condenser can be larger and, with the need for no obstruction to airflow around the entire unit, can take up valuable space.  They tend to be noisier to run so this could be a problem in built-up areas. Although it is claimed that some air cooled condensers are now offering much better energy efficiency it is still argued they tend to be less energy efficient, so cost more to run.  

It is clear that both systems have their merits so it is impossible to say that one is better than the other. Each has its advantages and both can offer the ideal solution when reviewing modes of operation, size of the refrigeration plant, available space, cost and efficiency. There is also the less scientific approach of previous experience and individual preference. The design engineers at Stonegrove Refrigeration will always view the individual elements of each project and select the best option for the client.  

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