Minimal air circulation can reduce the lifespan of your equipment. A lot of people choose to remove the door of their cabinet to maximize air circulation.
If you’re worried about your safety, you should consider installing a cabinet air conditioner. The same items that you keep in your cabinet like power supplies, battery back-up systems or PLC systems might be the same source of heat that you want to get rid of.
Blast furnaces, solar heat gain and industrial ovens are examples of external sources of heat that can cause your cabinet’s internal temperature to rise above the desired level. Here are some of the most important things that you need to keep in mind when looking for a cabinet air conditioner.
1. Internal Heat Load
Internal heat load pertains to the heat produced by the equipment inside the cabinet. There are various methods that can help you determine a component’s internal heat load.
One of these is by adding the maximum heat output specifications stated by the manufacturers for all the equipment you have inside your cabinet. The maximum heat output is usually provided in watts.
2. Heat Load Transfer
Heat load transfer pertains to the heat gained or lost through the cabinet walls with the outside ambient air. You can use this formula to calculate heat load transfer.
Heat transferred = surface area x (temperature A – temperature B)
- Heat transferred is the amount of heat gained or lost through the material that separates both sides.
- Surface area pertains to the surface area of the material that the heat is being transferred through.
- Temperature A pertains to the larger of the 2 temperatures on both sides of the separating material.
- Temperature B is the smaller of the 2 temperatures.
- R-value pertains to the separating material’s R-value.
You have to get the difference in the two temperatures and divide it by the R-value of the separating material. Multiply the result by the area of the wall.
Once you have determined the heat load transfer and internal heat load, you can pick the right unit size by computing the required cooling capacity. You can use the formula “cooling capacity = internal heat load ± heat load transfer.”
3. The Science of Branding
The brand is an important consideration as well. Manufacturers follow certain standards when building their units, so all of them should last for 1 year or more without any kind of external or internal damage. You can read reviews made by previous and current users of the model that you are interested in. This will give you an idea about the overall performance of the unit.
Consider the worst case conditions when choosing the size of your cabinet air conditioner. Make sure that you don’t pick an oversized unit. A reliable cabinet air conditioner can prevent internal heat load and high ambient temperatures from causing equipment failure. You can find 1,000 to 20,000 BTUH units that cover a wide range of cabinet sizes and applications. There are air conditioners that can evaporate condensation before it escapes the unit. This feature increases the unit’s efficiency.