These steps will help you gain a basic idea of your enclosure’s estimated total heat load. This is the approximate number of degrees by which your enclosure’s internal temperature will rise above the ambient temperature. Draw a horizontal line from your intersection point to the graph’s vertical axis.Use the upper curve if your enclosure is made from unfinished aluminum or stainless steel, and the lower curve if your enclosure is non-metallic or painted metal. Draw a vertical line from that number until you intersect one of the temperature rise curves. On the graph below, find the input power in watts per square foot on the bottom axis.Take the amount of heat dissipated within the enclosure in watts and divide it by the enclosure’s surface area in square feet. First, find the input power, expressed in watts per square foot.Here’s a simplified set of steps for calculating an electrical enclosure’s temperature rise: How to Calculate Temperature Rise Inside Enclosures Remember to keep these factors in mind when performing calculations about an enclosure’s heat levels. Horizontally mounted enclosures may experience significantly more complex heat transfer mechanisms than vertically mounted enclosures. The orientation of the enclosure when mounted (horizontally or vertically) will also affect how heat dissipates inside the enclosure.Enclosures painted in white or other light colors will absorb less heat than enclosures painted in black or dark colors. Outdoor enclosures in direct sunlight may absorb solar heat. Environmental conditions outside can increase the internal heat load if the ambient air temperature heats the enclosure material.The material composition of the wall that the enclosure is mounted on will affect heat dissipation.Since heat rises in air, many vertically mounted enclosures can have internal temperature differences that make them hotter at the top than they are at the bottom.Painted steel and polycarbonate are known for their ability to radiate heat more effectively than other materials such as stainless steel or unfinished aluminum. Certain types of materials and finishes will dissipate heat more effectively than other types will. In addition to the heat generated by the components inside the enclosure, other factors affect the temperature rise, including: You’ll find a number, usually measured in watts, that represents the component’s heat load.įactors That Affect Enclosure Temperature The best way to learn about each component’s heat generation characteristics is to check the specifications provided by its manufacturer. Since this list includes many of the most critical elements of industrial control panels and power distribution systems, it’s imperative that your device and enclosure are designed correctly to avoid overheating. Types of components that often generate heat include: Many of the electrical and electronic components that are protected by electronic enclosures generate heat when power flows through them. First, let’s cover the basics of how electrical components create that heat. In this article, we’ll discuss the basics of calculating temperature rise inside enclosures, and we’ll also quickly review some options for dissipating the heat produced inside an enclosure - from ventilation to heat sinks to internal air conditioners. All electronic components generate some amount of heat, and controlling the accumulation and dissipation of heat inside an enclosure is fundamental to ensuring that your device works properly. Designers of electrical and electronic devices must take many factors into account, but temperature rise is among the most important.
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