Category: exair

Super Air Amplifier vs Fan

Published on by Al WooffittLeave a comment

One of the more common applications we work with is cooling. In most instances, the goal is to cool the part as quickly as possible. In order to cool faster, you would think that blowing the coldest air possible would be the best option. Our Vortex Tubes can produce air as cold as -50°F! However, in many instances, more effective cooling will be achieved through larger volumes of air. As long as the ambient air temperature is lower than the target temperature, larger volumes of ambient air will outperform a small volume.

Our Super Air Amplifier is a great option for producing large volumes of laminar (non-turbulent) airflow for minimal compressed air consumption. Using a Coanda profile along with a patented shim, compressed air exits the Amplifier in a manner that generates a low pressure zone, which helps pull in the surrounding ambient air. This creates an amplification ratio of up to 25 times! Due to the laminar output flow having the same speed and direction, it is very effective at removing heat from a target. It also helps keep noise levels down.

The most common, non-compressed air alternative to our Amplifiers is an electric fan. Fans utilize motors and blades to direct air towards their target. When air comes in from behind the fan, the blades push the air forward to the target. This action generates turbulent air flow, as well as a lot of noise. Due to the use of motors, there are parts that can wear out over time, leading to additional maintenance costs over the lifetime of the fan.

Ultimately, when it comes to cooling, what we care about most is how quickly a given solution will get the job done. Is a Super Air Amplifier going to cool faster than a fan? In the video below we put both options to the test. As you will see, the Super Air Amplifier is significantly faster:

If you have a cooling application that you would like to discuss, give us a call!

Al Wooffitt
Application Engineer

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Robert Boyle and Boyle’s Law

Published on by Al WooffittLeave a comment

We’ve written many blogs about our intelligent compressed air products; we have a lot of great products to talk about (our Vortex Tubes are my favorite). Occasionally, we like to talk about certain people of interest, or people that have had an impact on the compressed air industry. In this blog I am going to cover one of those people: Robert Boyle.

Born on January 25, 1627, at Lismore Castle in County Waterford, Ireland. He was an Anglo-Irish natural philosopher, chemist, and physicist, and he explored various other fields of study. In 1661, he published his book The Sceptical Chymist, which many regard as the cornerstone of modern chemistry.

Even though his main focus was chemistry, one of Boyle’s most notable scientific contributions is what we now call the first gas law, aptly named Boyle’s Law. Boyle’s Law explains how pressure and volume relate in a closed space when considering the mass of an ideal gas. Boyle, along with his assistant Robert Hooke, utilized a closed J-shaped tube and added mercury from the open end, which caused the air on the opposite side to compress due to the pressure. After conducting this experiment with various amounts of mercury, Boyle concluded that the pressure of a gas is inversely related to the volume it occupies.

Boyle used a ‘J’ Tube – Sealed on the Short End, and Open at the Long End

This relationship between pressure and volume is of obvious interest to us in the compressed air industry. Nitrogen, oxygen and hydrogen (the three primary components of air) are ideal gases, so are governed by this relationship. This means that if we reduce the volume of a given space, the air inside that space will increase in pressure. This principle plays a key role in various areas of air system design as well, including determining compressor output, reservoir storage, pneumatic cylinder efficiency, and more.

Sadly, on December 31, 1691, Robert Boyle passed away. However, the impact he made on fluid dynamics lives on to this day. At EXAIR we use the pressure and volume of compressed air for our products to make them quiet, safe and efficient. If you have questions about any of our quiet EXAIR Intelligent Compressed Air Products, feel free to contact EXAIR or any Application Engineer.

Al Wooffitt
Application Engineer

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The 30-Day Guarantee Gives You Confidence.

Published on by Al WooffittLeave a comment

When you make a purchase, you want to have confidence that the solution that you’ve spent money on is going to work. With many of the applications that we discuss with customers, the solutions are tried and tested. If your electrical panel is getting too hot, then an EXAIR Cabinet Cooler is exactly what you need. If there’s static on your assembly line, a Gen4 Static Elimination product is the way to go. And if you need to blow off excess water from an extruded pipe, a Super Air Wipe is the perfect fix.

There are plenty of situations where the solution isn’t clear-cut. We believe our products can make a difference, but with so many variables, it’s impossible to just plug everything into a formula and predict the exact outcome. The only way to know for sure is to test. That’s where EXAIR’s 30-day unconditional guarantee comes into play. Every one of our cataloged products is covered by this guarantee. Once you buy one of these items, you have a month to really test it out; change the angle, tweak the operating pressure, or swap out shims. If you manage to find the right setup to fix your issue, awesome! If not, we’ll gladly take it back and give you a full refund! The only thing you need to cover is the shipping to return it to us.

A great example of where testing is key is our Line Vacs. There are several factors to consider: the bulk density of the material, its size, whether it’s abrasive, the desired conveyance rate, and the distance for conveyance – both vertical and horizontal. By using the data we’ve gathered from our controlled in-house tests, we’re going to be able to give you a solid recommendation on which model will suit you best. However, to truly understand how our Line Vac will perform with your specific material and operational conditions, it needs to be put through its paces at your facility. When you buy from us, you get 30 days to try it out risk-free.

At EXAIR, we want to ensure you are getting the best possible solution. Our 30-day unconditional guarantee is one way that we make that a reality. If you would like to discuss how our products can help with your application, give us a call!

Al Wooffitt
Application Engineer

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Banner Image by Bruno from Pixabay

Comparing and Combining Sound Levels

Published on by Al WooffittLeave a comment

Sound levels are an important safety consideration in most industrial facilities. OSHA has guidelines on allowable noise levels and exposure, covered in OSHA Standard 29CFR – 1910.95 (a). Sound levels are measured in decibels, or dB. It makes sense that a higher decibel value means a louder sound (as illustrated in the graphic below). What is not intuitive is how multiple sound levels interact and combine, or how they compare to one another.

The first thing to understand about sound levels is that they aren’t measured on a linear scale. Instead, they’re measured on a logarithmic scale. This can really throw off our intuition. For instance, a sound at 20dB is actually 10 times stronger than one at 10dB, and a sound at 30dB is 100 times stronger than 10dB. If it were a linear scale, 20dB and 30dB would only be 2 and 3 times stronger than 10dB, similar to how mass works—like 20kg being double the mass of 10kg.

You can see why this is the case with the formula for calculating sound levels, which is as follows:

It’s important to note that the sound pressure levels calculated using this formula are unweighted. To really grasp how loud something will seem to us, we have to consider how our ears pick up various frequencies. This means that low and extremely high frequencies are given less weight than on the standard decibel scale. This adjusted measurement is referred to as dBA. You can check out some typical sounds and their dBA levels in the chart below:

Because of this logarithmic scale, combining two sounds can be pretty counter-intuitive too. Our Model 1100 Super Air Nozzle generates a sound level of 74 dBA, but when you place two of them side by side, the sound level jumps to 78 dBA (and not 148dBA). This is determined using the formula below:

The specifics of this calculation are explained in this blog here, but OHSA provides a quick and easy way to calculate, as shown in the table below:

To see if you need to tackle the noise levels in your facility, you should start by taking a baseline measurement of the different processes and devices that are making the noise. EXAIR’s Sound Level Meter, Model 9104, is here to help. It’s super user-friendly and gives you a digital readout of the sound level (no need to deal with logarithms!).

If you would like to discuss sound levels in your facility, or any of your other compressed air needs, give us a call!

Al Wooffitt
Application Engineer

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