Discover How to Use Heat Recovery to Cut Your Energy Costs

 

In industrial operations, compressed air plays a vital role across a range of manufacturing processes. As air undergoes compression, its moisture content rises significantly. Air compressor manufacturers use intercoolers and aftercoolers to remove much of the water from the air stream to address this. Still, the coolers alone do not remove enough moisture for some applications, and an external dryer, particularly heat of compression (HOC) dryers, become critical.

Since air compressors are such a good heat source, many operators find benefits in recovering that heat and turning it into energy savings for their facility. To do this, your compressed air system will need a compressor paired with a dryer. There are many types of compressed air dryers available to remove moisture from the air, but it is important to make sure that if you decide to go down this path that great care is taken in planning your system. Often the selection would include both your compressor and heat of compression dryer.

What are Heat of Compression (HOC) Dryers?

Among the available dryer options, HOC desiccant dryers offer a high-efficiency solution for facilities running continuous-duty compressors.  These HOC dryers use a process called adsorption to remove water from the air. A hygroscopic material, or desiccant, is used to remove the water, which clings to its surface. However, over time, the desiccant becomes saturated with water and must be regenerated or dried.  During its normal operation, the centrifugal air compressor creates heat. Instead of consuming additional energy for this regeneration process, HOC dryers harness the heat from the compressor discharge. This high-temperature air is redirected through the saturated desiccant bed, evaporating the moisture and restoring the desiccant’s drying capacity. By using the system’s thermal output, HOC dryers eliminate the need for external heating sources, dramatically improving system energy efficiency.
 

Key Considerations for System Integration

Before deciding to add an HOC dryer to your plant’s system, there are important factors such as the type of air compressor installed and the level of dryness that needs to be achieved. 

The Importance of Understanding Your System Set-up

Before deciding to add an HOC dryer to your plant’s system, there are important factors such as the type of air compressor installed and the level of dryness that needs to be achieved.

To better understand HOC dryers and find out if it’s the right solution for you, check out our Hidden Costs of HOC Air Dryers in Centrifugal Compressor Operation white paper.