Sound is measured in decibels (dB) using a sound meter by reading frequencies of noise. Decibels are different from other familiar scales of measurement, in that the decibel scale is logarithmic: If a sound is 80 decibels, and we add another 10 decibels, the sound will be ten times more intense, and will seem about twice as loud to our ears.
NEMA stands for the National Electrical Manufacturers Association, and they are the organization that decided to categorize cases and enclosures for electrical equipment to allow a purchaser to know exactly what the contents will be protected against. The NEMA ratings are primarily for use in the USA, although they will give any buyer a good idea of what to expect.
Combustible vapors, liquids, gases, or flammable dusts are often present in many industrial applications. These materials are safe in small amounts, but when they exist in abundance, they become a hazard. These hazards wreak havoc, causing damage to equipment and property, harming employees, and hurt profits.
To combat system failure, it’s crucial that electrical cabinets are equipped with an enclosure cooling system. It’s important to consider the following factors when selecting an enclosure cooling product: heat load, enclosure location, and solution type; along with weighing the pros and cons to each method.
Discusses the basic operation of vortex tube technology and guides the reader on the proper application in many heating and cooling applications. This informative paper details how vortex tubes, with no moving parts, create hot and cold air streams from a compressed air source. Attention is given to proper model selection and adjustment and discusses how the quality of the compressed air supply and conditions downstream of the vortex tube can positivity or negatively impact the success of the installation.
There is no dispute that power densities have increased as enclosure volumes have gotten smaller. Packing components more densely reduces the circuit size and increases speed but leaves little room for heat dissipation. Because many industries, including manufacturing, food, chemical, water and wastewater processing, oil refining and petrochemical processing, and others, have become more dependent on sophisticated microprocessors, PLCs and VFDs, the need for proper heat dissipation has become crucial to keep controls protected. Tightly packed enclosures and panels restrict airflow, resulting in rapidly rising internal temperatures, thermal runaway, and increasing control failures.
High temperatures cause over 50% of electronic equipment failures, according to a study by the US Air Force Avionics Integrity Program. Vibration and humidity each contribute an additional 20% of failures says the same study. Long term weather forecasts for 2014 predict temperatures in many areas to be hotter than normal beginning in May and continuing through August with temperatures peaking in late June through late August.