Tag: power

Heat Transfer (Conduction, Convection, Radiation)

Published on by Jordan T ShouseLeave a comment

Thermal energy moves from warmer regions to cooler ones through conduction, convection, and radiation. Objects continuously lose heat until they achieve thermal equilibrium, meaning they reach the same temperature as their environment. For instance, a steaming mug of tea will gradually cool until it matches the temperature of the room.

But how that mug looses that heat is what this blog is all about.

CONDUCTION:

Thermal energy moves through solids mainly via conduction. This phenomenon happens when two solid items with varying temperatures come into contact, enabling heat to transfer from the warmer object to the cooler one. For instance, in the scenario of a hot coffee mug resting on a cold table, the thermal energy shifts from the mug to the table beneath it.

CONVECTION:

Convection refers to the movement of fluids, whether they are liquids or gases, and can occur naturally or be induced by external forces. Fluids can either absorb or release heat, depending on their temperature. Natural convection happens due to variations in density; for instance, steam rises from the top of the mug as the steam rises, colder air is cycled in.

RADIATION:

While the coffee emits infrared radiation as it loses heat, this process is generally less significant compared to conduction and convection in the context of a cup of coffee. This type of heat loss can be felt by holding your hand near a warm coffee cup as shown.

No matter how the heat is transferred to an object, if it needs to be cooled there is a good chance that one of our Application Engineers has approached a similar issue and can help. To discuss, contact us, and we will walk through the best method to eliminate the heat from within your application.

Jordan Shouse
Application Engineer

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Wonder Twins – With Our Powers Combined

Published on by Brian FarnoLeave a comment
Comic-Con Exclusive DC Classics Wonder Twins with Gleek at the Mattel booth at San Diego Comic-Con International
1 – Comic-Con Exclusive DC Classics Wonder Twins with Gleek at the Mattel booth at San Diego Comic-Con International

EXAIR and BETE both offer a wide variety of External Mix Air Atomizing Spray Nozzles. The amount of knowledge that has been obtained by these two companies on compressed air and spray nozzles is tremendous and the level of expertise is second to none in the industry. So how does that help our potential customers and existing client base?

When it comes to spray nozzles, EXAIR has been in the game for over a decade, BETE has been in the game for nearly 75 years. The two have now combined and with our knowledge of how compressed air operates and their historical knowledge of liquid spray nozzles we are able to best serve our customers whether it is defining the spray characteristics of a nozzle, determining if additional testing would be the best path forward to meet the needs of their spray nozzle application. It could even be after we have sprayed the liquid on a part for a rinse or cooling, drying it and providing additional cooling.

The combination of our two teams has been monumental thus far with being able to transition customers from one product line to another if needed. This means if you have a liquid spray application that EXAIR doesn’t have the ideal fit, chances are BETE has something that will work and we can provide that handoff seamlessly to their Application Engineering team. This has also expanded our own Application Engineers level of knowledge with spray nozzles and the characteristics that customers may look for in the liquid spray applications. I’ve talked about this time and time again, we are continually bettering ourselves, our knowledge, and our product offering. This time we expanded it exponentially.

So whether you are trying to wash, coat, or cool with liquid, then make sure you blow the debris / liquid or drying a coating. EXAIR and BETE stands at the ready to help you and your team find the products that are right for you, whether they are BETE or EXAIR.

Brian Farno, MBA – CCASS
National Business Development Manager

BrianFarno@EXAIR.com
@EXAIR_BF

1 – Comic-Con Exclusive DC Classics Wonder Twins with Gleek at the Mattel booth at San Diego Comic-Con International – Loren Javier , retrieved from – https://www.flickr.com/photos/lorenjavier/3759943890/

It’s Getting Hot In Here!

Published on by Brian FarnoLeave a comment

Okay, if you did not finish the song lyrics when reading the title, it’s okay, we can still be friends. In all actuality, the temps are warming up here in the MidWest as we prepare for our false Spring as indicated by the freezing temps and snow we received earlier this week. There is one thing that has stayed constant and that is the methods of heat generation.

1 – Kettle-convection-conduction-radiation

Heat generation is a result of energy conversion. The conversion of energy to do work, whether it is actual voltage going through a transformer that operates a neon sign to light up the roadside sky or energy from a hydraulic ram that is compacting recycled paper into a bundle and the hydraulic fluid is being pressed in and out of cylinders from a pump, all of it will have some form of a heat byproduct. This heat then gets transferred and how it is transferred can be helpful to know.

2 – Energy Transfer – Heat

At the molecular level, atoms store the energy that will cause electrons to enter into an excited state and rapidly switch between shells. When the electron returns to a lower shell (closer to the nucleus), energy is released; the energy released is then absorbed by atoms at a lower energy state and will continue until the thermal energy is equal between the two objects. Heat has four fundamental modes of transferring energy from surface to surface, and they are as follows:

Advection
Advection is the physical transport of fluid from point A to point B, which includes all internal thermal energy stored inside. Advection can be seen as one of the simpler ways of heat transfer.

Radiation
Radiation is the transfer of thermal energy through empty space and does require a material between the two objects. Going back to how thermal energy is released from atoms when the electron returns to a lower energy shell, the energy is released in the form of light ranging from infrared light to UV light. Energy in the form of light can then be absorbed by an object in the form of heat. Everyone experiences radiation transfer every day when you walk outside; the light from the sun’s radiation is what keeps this planet habitable.

Conduction
Conduction can also be referred to as diffusion and is the transfer of energy between two objects that have made physical contact. When the two objects come into contact with each other, thermal energy will flow from the object at the higher temp to the object at the lower temp. A good example of this is placing ice in a glass of water. The temperature is much lower than the room temperature. Therefore, thermal energy will flow from the water to the ice.

Convection
Convection is the thermal energy transfer between an object and a fluid in motion. The faster the fluid moves, the faster heat is transferred. This relies on the specific heat property of a molecule to determine the rate at which heat will be transferred. When a molecule has a lower specific heat, it takes faster motion and larger volumes to achieve the full effect of convection transfer. Convection is used in modern ovens to get a more even heat throughout the food while cooking.

No matter how the heat is transferred to an object, if it needs to be cooled there is a good chance that one of our Application Engineers has approached a similar issue and can help. To discuss, contact us, and we will walk through the best method to eliminate the heat you need to.

Brian Farno
Application Engineer
BrianFarno@EXAIR.com
@EXAIR_BF

1 – “Kettle-convection-conduction-radiation” by P.wormer is licensed under CC SA 3.0
2– “Energy Transfer – Heat” by Siyavula Education is licensed under CC BY 2.0

Sound: Explaining Power and Pressure

Published on by Brian FarnoLeave a comment

Sound Power…  When I hear that term all I can think of is the classic commercial Maxell®Sound made in 1983.  I was only a year old when that commercial graced the presence of everyone’s TV.  I did see it throughout the years and recall recording Casey Kasem’s Top 40 on Maxell cassettes.  Then, in college it was a classic poster you would see around the dorms.

1(Maxell / Retrontario, 2009)

Needless to say, this does show sound power and sound pressure which is the point of this blog. This video however is not an industrial environment that most of us are accustomed to when worrying about the sound power / sound pressure within an environment.

If you observe the video above the speakers and the driver of the speakers is the generator of sound power.  That is the energy rate emitted by a source.  This power then begins to fill a space which is equivalent to the sound intensity.  This is because the sound energy has a direction that is given to it, think of the speaker.  The speaker gives the sound energy a vector to travel.  Then when the vector hits surfaces that is the sound intensity.

This sound intensity can then be interpreted as the sound power transfer per unit of surrounding surface at a distance.  This will then give the information needed to convert the information to the Sound Pressure level.  This is the force of a sound on a surface area perpendicular to the direction of the sound.

With this information we can then observe the logarithmic unit (or value) used to describe the ratio of sound power, pressure, and intensity, the decibel.  The decibel is what all industrial hygienists and safety personnel are concerned with.   In the end, all of this is started at the point of power generation, when observing compressed air blowoffs, this is the exit point of air from the device.  If you optimize the point of use device to use the least amount of compressed air and be the most efficient then the amount of sound power being generated and eventually being measured as decibels at an operator’s work station, then the result will be lower ambient noise levels.

If you would like to see any of the math behind these conversions (an amazing blog by our own Russ Bowman), click the link. If you want to discuss optimizing your compressed air operations and lower the noise level of the compressed air products in your plant, please contact us.

Brian Farno
Application Engineer
BrianFarno@EXAIR.com
@EXAIR_BF

 

 

 

Video Source: Classic Maxell Cassette commercial – Retrontario – https://www.youtube.com/watch?v=Zk71h2CQ_xM