Tag: air compressor efficiency

Compressed Air Is Powering the Energy Transition — Not Just Manufacturing

Published on by Jordan T ShouseLeave a comment

A major breakthrough just hit the industry: researchers unveiled the world’s most powerful single-unit compressed air energy storage (CAES) compressor, rated at 101 MW.

  • Achieves ~88% efficiency at max discharge pressure
  • More than doubles the power of prior single-unit CAES compressors
  • Designed to store energy by compressing air for later electricity generation

This positions compressed air not just as a plant utility—but as a grid-scale energy storage solution.

From Shop Air to Grid Power

For decades, compressed air has been known as the “fourth utility” of manufacturing—powering tools, automation, conveying systems, and production lines across nearly every industrial sector.

But today, compressed air is stepping into a much larger role.

Recent breakthroughs in compressed air energy storage (CAES) technology are transforming compressed air from a plant-floor necessity into a grid-scale energy solution. Massive new compressor systems are now capable of storing surplus renewable energy and releasing it back into the electrical grid when demand spikes.

In other words, compressed air isn’t just powering production anymore—it’s helping power the future of energy.

What Is Compressed Air Energy Storage (CAES)?

Compressed Air Energy Storage is a method of storing energy for later use—similar in purpose to batteries, but very different in scale and operation.

Here’s how it works:

  1. Energy Capture
    Excess electricity—often from renewable sources like wind or solar—is used to power large compressors.
  2. Air Compression & Storage
    The compressed air is stored in underground caverns, tanks, or geological formations.
  3. Energy Release
    When electricity demand rises, the stored air is released, heated, and expanded through turbines to generate power.

Why CAES Matters

Renewable energy plays a critical role in the global shift toward sustainability, but it comes with a fundamental challenge: intermittency. Solar power only generates electricity during daylight hours, wind output fluctuates based on weather conditions, and grid demand changes constantly throughout the day. This mismatch between energy production and consumption creates reliability challenges for utilities. Compressed Air Energy Storage (CAES) helps solve this issue by capturing excess energy when supply is high and releasing it when demand spikes. The technology provides long-duration energy storage, supports grid stabilization, helps meet peak demand, and reduces reliance on fossil fuel peaker plants. While lithium-ion batteries currently dominate short-term storage solutions, compressed air stands out for its ability to store massive volumes of energy over longer periods—making it especially well suited for utility-scale applications.

A Breakthrough Moment for Compressed Air

Recent advancements in high-capacity compressors designed specifically for energy storage are pushing the boundaries of what compressed air technology can achieve. These next-generation systems deliver unprecedented compression power, achieve significantly higher efficiency levels, and are engineered to support renewable energy integration at grid scale. By reducing energy loss during compression and discharge cycles, they make large-scale air storage more practical and economically viable than ever before. This innovation marks a turning point for the industry: compressed air is no longer confined to manufacturing facilities—it is now being positioned as a core component of national energy infrastructure planning and the broader transition to renewable power.

Jordan Shouse, CCASS

Application Engineer / Sales Operations Engineer

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Schematic of the compressed air energy storage method courtesy of (Image: https://voltatechnique.com/technology/) Creative Commons License

Centrifugal Air Compressors

Published on by Jordan T ShouseLeave a comment

There are two main types of compressors, positive displacement and Dynamic.

Positive displacement air compressors raise air pressure by reducing the volume of air within a confined space.  The scroll compressors use two inter-meshing scrolls, where one scroll is moving, and the other scroll is stationary (reference photo below).  Ambient air will get trapped at the inlet side, and as the orbiting scroll moves, the spiral volume gets smaller and smaller.  When volume decreases, the pressure will increase.  Rotary Scroll air compressors are less common in the rotary family, as they are limited in capacity.    

The dynamic type raises the air pressure by using kinetic energy and velocity with rotating impellers that continuously bring in airflow.  In this blog, I will cover the centrifugal type of the dynamic branch. 

As mentioned, the centrifugal compressor works by transforming kinetic energy and velocity into pressure.  Ambient air passes through guide vanes into the center of a rotating Impeller with radial blades and is then pushed outward by a centrifugal force. 

 With the increase in pressure, you will get an increase in heat.  It is a natural occurrence with air compressors.  Heat from the centrifugal compressor is dissipated by heat exchangers before moving onto the next stage.  Multiple stages are required to raise the pressure to a sufficient level for typical industrial plant requirements.  The most common centrifugal air compressors have two to four stages to generate pressures up to 100 to 150 PSIG.  Centrifugal compressors are near the middle of the road regarding efficiency.  Their typical operating cost is 16 to 20 kW/100 CFM. 

Advantages:

  • Up to 1500 HP systems are available
  • Price per horsepower drops as system size increases
  • Supplies lubricant-free air
  • Special installation pads are not required for installation

Disadvantages:

  • Costs more Initially
  • Requires specialized maintenance

No matter the type of air compressor that you use, they are very costly to operate.  To help you use them efficiently and safely, EXAIR offers a range of products that can clean, cool, blow, conserve, and convey.  This would include our Super Air Knives, Super Air Nozzles, Safety Air Guns, Cabinet Coolers, and much more.  If you want to save energy, increase safety, and cut costs no matter what size air compressor you have, contact an Application Engineer at EXAIR.  We will be happy to help you make your use of compressed air as efficient and safe as possible. 

Jordan Shouse
Application Engineer

Send me an email
Find us on the Web 
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Twitter: @EXAIR_JS

Images Courtesy of the Compressed Air Challenge

Air Compressors: Centrifugal Type.

Published on by John BallLeave a comment

There are two main ways to compress air for supplying pneumatic systems; Positive Displacement and Dynamic.  Positive Replacement reduces the volume of air within a confined space to generate pressure.  The dynamic type raises the air pressure by using kinetic energy and velocity with rotating impellers that continuously brings in airflow.  In this blog, I will cover the centrifugal type of the dynamic branch. 

As mentioned, the centrifugal compressor works by transforming kinetic energy and velocity into pressure.  Ambient air passes through guide vanes into the center of a rotating Impeller with radial blades and is then pushed outward by a centrifugal force. This radial velocity of air results in an increase in pressure due to kinetic energy.  Let’s look at the equation for kinetic energy in Equation 1:

Equation 1: 

K = ½ * m * V2  

K – Kinetic Energy (J)

m – mass (Kg)

V – velocity (m/s)

As you can see, the energy increases with the square of the velocity.  How do we increase the velocity?  Let’s look at Equation 2:

Equation 2:

V = w * r

V – linear velocity (m/s)

w – angular velocity (rad/sec)

r – radius (m)

As you can see, as the air travels along the impeller towards the outside, the radius increases.  Since the rotations per second are constant, the velocity will increase.  In combination with Equation 1, you can see how the energy will increase, thus increasing the pressure. 

 With the increase in pressure, you will get an increase in heat.  It is a natural occurrence with air compressors.  Heat from the centrifugal compressor is dissipated with heat exchangers before moving onto the next stage.  Multiple stages are required to raise the pressure to a sufficient level for typical industrial plant requirements.  The most common centrifugal air compressors have two to four stages to generate pressures up to 100 to 150 PSIG.  Centrifugal compressors are near the middle of the road regarding efficiency.  Their typical operating cost is 16 to 20 kW/100 CFM. 

Advantages:

  • Up to 1500 HP systems are available
  • Price per Horsepower drops as system size increases
  • Supplies lubricant-free air
  • Special installation pads are not required for installation

Disadvantages:

  • Costs more Initially
  • Requires specialized maintenance

No matter the type of air compressor that you use, they are very costly to operate.  To help you use them efficiently and safely, EXAIR offers a range of products that can clean, cool, blow, conserve, and convey.  This would include our Super Air Knives, Super Air Nozzles, Safety Air Guns, Cabinet Coolers, and much more.  If you want to save energy, increase safety, and cut costs no matter what size air compressor you have; you can contact an Application Engineer at EXAIR.  We will be happy to help you. 

John Ball
Application Engineer
Email: johnball@exair.com
Twitter: @EXAIR_jb

Images Courtesy of the Compressed Air Challenge

Air Compressors: Savings Found on the Supply and Demand Side

Published on by John BallLeave a comment

Producing compressed air can be expensive, but it is necessary for pneumatic systems.  And a large part of that expense is wasted energy, in the form of heat.  Waste will add to your overhead and affect your bottom line.  EXAIR has a line of products to help reduce air consumption at the point-of-use to save you money.  This would include replacing open-pipes and tubes with EXAIR Super Air Nozzles and Super Air Knives.  But, let’s look at the supply side inside your compressor room.  The air compressor operates at about 10% efficiency where most of that loss is in a form of heat. 

Wouldn’t it be nice to recover some of that expense?  You can.  By equipping your air compressor with a heat recovery system.  These systems are designed to recover the loss of heat for other uses.  Today, they can recover somewhere between 50% for liquid-cooled compressors to 80% for air-cooled compressors.  The heat can come from the after-coolers, the electric motor, the “heat of compression”, and the oil cooler.  This reclaimed heat can be used to heat water, warm rooms, pre-heat steam systems, and dry parts. 

Let’s create an example.  A company has a 100 HP air-cooled compressor that is running 8 hours per day for 250 days per year.  The heat recovery system will be able to reclaim 60% of the heat to warm city water in the plant.  If the electrical cost is $0.10 per KWh, we can calculate the savings.

Annual Savings:

100 HP * 0.746 KW/HP * 0.6 (reclaim) * 8 hours/day * 250 days/yr * $0.10/KWh = $8,952.00 savings per year.

In practice, reclaiming the maximum percentage may not be cost effective.  Your company can determine the best percentage for heat recovery by calculating the Return on Investment (ROI).  I wrote a blog post that can help you estimate (Click Here). 

As mentioned above, EXAIR saves you money and increase efficiency on the demand side.  EXAIR has engineered nozzles to help reduce compressed air usage.  The following is a quick calculation by replacing an open-end blow-off with an EXAIR Super Air Nozzle.  If you have a ¼” (6mm) copper tube, it will use 33 SCFM (935 SLPM) of compressed air at 80 PSIG (5.5 bar).  As a common replacement, EXAIR uses a model 1100 Super Air Nozzle which will use 14 SCFM (396 SLPM) at 80 PSIG (5.5 bar).  With a simple tube fitting, you can mount the ¼” NPT Super Air Nozzle to the end of the ¼” copper tube.  If we use the same pretext as above, we can find the annual cost savings.  With an air compressor that produces 5 SCFM/hp, we can get a cost savings with the Super Air Nozzle.  The difference in air flow at 80 PSIG (5.5 bar) is:

33 SCFM (copper tube) – 14 SCFM (Model 1100) = 19 SCFM savings

Annual Savings:

19 SCFM * 1 HP/ 5 SCFM * 0.746 KW/HP * 8 hr/day * 250 days/yr * $0.10/KWh = $566.96 savings per year per nozzle.

Whether it is on the supply side or the demand side, companies are looking to reduce or reuse the wasted energy to have a more efficient compressed air system.  The heat recovery system is a bit more complex, but should be considered.  The EXAIR engineered nozzles are more simplistic, and they can give you a return on your investment in a short period of time.  If you would like to discuss how to improve your compressed air system from the supply side to the demand side, an Application Engineer at EXAIR will be happy to assist you. 

John Ball
Application Engineer

Email: johnball@exair.com
Twitter: @EXAIR_jb

Photo: Idea by Saydung89.  Pixabay License.