The below video reviews the Sanitary Flange Line Vac, the newest type from the EXAIR family of Line Vacs.
If you have questions about the Sanitary Line Vac, or would like to talk about any of the EXAIR Intelligent Compressed Air® Products, feel free to contact EXAIR and myself or any of our Application Engineers can help you determine the best solution.
A few weeks ago, we looked at the Vortex Tube and provided a general overview of the device (see that blog here.) In a nutshell – a Vortex Tube uses an ordinary supply of compressed air as a power source, creating two streams of air, one hot and one cold – resulting in a low cost, reliable, maintenance free source of cold air for spot cooling solutions.
One of the features of the Vortex Tube is that the temperature of the cold air and the cold air flow rate is changeable. The cold air flow and temperature are easily controlled by adjusting the slotted valve in the hot air outlet.
Opening the valve (turning it counterclockwise) reduces the cold air flow rate and the lowers the cold air temperature. Closing the valve (turning it clockwise) increases the cold air flow and raises the cold air temperature.
As with anything, there is a trade off – to get higher a cold air flow rate, a moderate cold air temperature is achieved, and to get a very cold air temperature, a moderate air flow rate is achieved.
An important term to know and understand is Cold Fraction, which is the percentage of the compressed air used by the Vortex Tube that is discharged through the Cold End. In most applications, a Cold Fraction of 80% produces a combination of cold flow rate and and cold air temperature that results in the maximum refrigeration or cooling output form a Vortex Tube.
For most industrial applications – such as process cooling, part cooling, and chamber cooling, maximum refrigeration is best and the 32XX series of Vortex Tubes are preferred. For those applications where ‘cryogenic’ cooling is needed, such as cooling lab samples, or circuit testing, the 34XX series of Vortex Tube is best.
To set a Vortex Tube to a specific temperature, simply insert a thermometer into the cold air exhaust and adjust the hot valve. Maximum refrigeration, at 80% Cold Fraction, is achieved when the cold air temperature drop is 50°F (28°C) from the incoming compressed air temperature. See the video posted here for measuring and lowering and the cold air temperature.
For those cases when you may be unsure of the required cold air flow rate and cold air temperature to provide the needed cooling in an application, we would recommend an EXAIR Cooling Kit. The Cooling Kit contains a Vortex Tube, Cold Air Muffler, Air Line Filter, and a set of Generators that will allow for experimentation of the full range of air flows and temperatures possible.
Did you know that you can find 35+ published Case Studies regarding many of the EXAIR products and how customers were able to save on compressed air and increase safety simply by installing and using one of our Intelligent Compressed Air Products? Case studies provide real world results and highlight any dollar savings, production increases, quality improvements, safety improvements, and/or problems solved. The Case Studies are a valuable tool which can help determine success within your plant or aid in convincing a manager to implement an air savings project. With registration, they can be found under the Knowledge Base tab on the main page of the website, or simply click here.
Once on the Case Study page, you can search and sort by Product type or Application. Reading through the Case Studies of the type of product(s) of interest can provide valuable information on the compressed air savings and safety improvements that others have achieved, and that you might be able to realize as well.
The Case Studies involve measurable data from actual processes and offer learnings that can relate to applications and processes that are similar to those in your facility.
Each Case Study begins with the Application Goal – what was it that was to be achieved by the installation and use of the EXAIR product.
Then, we review the Before EXAIR condition – what was the problem, and what was being used initially.
Next, we show the After EXAIR process – this details the EXAIR product(s) that were implemented, and how it was able to improve the process.
Finally, the Summary section – this shows the cost savings attained, from less compressed air usage, faster operation rates, lower quality defects, reduced sound levels, and so forth that have been achieved and documented.
We invite you to read, download, and share the Case Studies, and use them as another tool available to you to learn about EXAIR products and how they can improve your processes.
We are always interested in learning about the compressed air savings and increased safety that have been realized by the use of an EXAIR product, and if you could share that information with us and have it result in a Case Study, we would love to talk to you and discuss how we can work together.
When you have two objects and they are of different temperatures, we know from experience that the hotter object will warm up the cooler one, or conversely, the colder object will cool down the hotter one. We see this everyday, such as ice cooling a drink, or a fan cooling a person on a hot day.
The Second Law of Thermodynamics says that heat (energy) transfers from an object of a higher temperature to an object of a lower temperature. The higher temperature object has atoms with higher energy levels and they will move toward the lower energy atoms in order to establish an equilibrium. This movement of heat and energy is called heat transfer. There are three common types of heat transfer.
Heat Transfer by Conduction
When two materials are in direct contact, heat transfers by means of conduction. The atoms of higher energy vibrate against the adjacent atoms of lower energy, which transfers energy to the lower energy atoms, cooling the hotter object and warming the cooler object. Fluids and gases are less heat conductive than solids (metals are the best heat conductors) because there are larger distances between atoms. Solids have atoms that are closer together.
Heat Transfer by Convection
Convection describes heat transfer between a surface and a liquid or gas in motion. The faster the fluid or gas travels, the more convective heat transfer that occurs. There are two types of convection: natural convection and forced convection. In natural convection, the motion of the fluid results from the hot atoms in the fluid moving upwards and the cooler atoms in the air flowing down to replace it, with the fluid moving under the influence of gravity. Example, a radiator puts out warm air from the top, drawing in cool air through the bottom. In forced convection, the fluid, air or a liquid, is forced to travel over the surface by a fan or pump or some other external source. Larger amounts of heat transfer are possible utilizing forced convection.
Heat Transfer by Radiation
Radiation refers to the transfer of heat through empty space. This form of heat transfer does not require a material or even air to be between the two objects; radiation heat transfer works inside of and through a vacuum, such as space. Example, the radiation energy from the sun travels through the great distance through the vacuum of space until the transfer of heat warms the Earth.
EXAIR‘s engineered compressed air products are used every day to force air over hot surfaces to cool, as well as dry and/or blow off hot materials. Let us help you to understand and solve your heat transfer situations.
Here is a brief video that provides a few details about my background and interests.
To discuss your application and how an EXAIR Intelligent Compressed Air Product can help your process, feel free to contact EXAIR and myself or one of our Application Engineers can help you determine the best solution.