Aftercoolers are mechanical heat exchangers that remove the heat generated during the air compression process. This cooling process not only lowers the air temperature but also condenses moisture present in the compressed air, preventing potential issues in downstream equipment.​

There are two main types of aftercoolers, each using a different cooling medium to reduce the temperature of compressed air. The choice between them typically depends on factors like the application, available utilities, and cooling requirements.
 

• Air-cooled aftercoolers: Utilize ambient air to cool the compressed air. A motor-driven fan forces ambient air over a finned coil through which the compressed air passes, facilitating heat exchange. This type is effective in reducing air temperature to approximately 15°F to 20°F above the ambient air temperature.
• Water-cooled aftercoolers: Employ water to absorb heat from the compressed air. Compressed air flows through tubes while water circulates around them, effectively removing heat. These aftercoolers can achieve temperatures close to the water's temperature, typically within 10°F to 15°F.

Installing an aftercooler in your compressed air system brings a number of practical advantages. From improving air quality to protecting downstream equipment, here are some of the key benefits you can expect.

• Moisture removal: Cooling compressed air causes water vapor to condense into liquid form, which can then be separated and removed. This process significantly reduces the moisture content in the compressed air, preventing corrosion and damage to pneumatic tools and equipment.​
• Enhanced equipment longevity: By reducing both heat and moisture, aftercoolers protect downstream equipment from excessive wear and potential failure, thereby extending the lifespan of dryers, filters, and pneumatic tools.​
• Improved product quality: In industries where compressed air contacts the final product, such as food processing or pharmaceuticals, removing moisture is crucial to maintain product integrity and quality.​
• Energy efficiency: By lowering the temperature of compressed air before it enters drying equipment, aftercoolers reduce the load on dryers. This efficiency allows for the use of smaller, less energy-intensive dryers, leading to cost savings.​
• Safety enhancement: Hot compressed air can pose safety risks, including burns and increased fire hazards. Aftercoolers mitigate these risks by cooling the air to safer temperatures suitable for various applications.​

When choosing an aftercooler, consider factors such as the volume of air flow, operating pressure, and the desired outlet air temperature. Additionally, assess the availability of cooling mediums (air or water) and the specific requirements of your application to determine the most suitable type of aftercooler for your system.​ Integrating an appropriately sized aftercooler into your compressed air system not only enhances performance and efficiency but also contributes to the longevity and reliability of your equipment.