Heat dissipation of electrical control cabinet

1. Fan (filter fan)
Fans (filter fans) are especially suitable for economically discharging high heat loads. The use of fans (filter fans) is effective only when the temperature in the cabinet is higher than the ambient temperature. Fans (filter fans) are the most common method used.
Because the hot air is lighter than the cold air, the air flow in the cabinet should be from bottom to top. Therefore, under normal circumstances, the front door or side wall of the cabinet should be used as the air inlet and the upper side as the air outlet.
1) If the environment of the work site is ideal, and there is no dust, oil mist, water vapor, etc. that affect the normal operation of the components in the electrical control cabinet, the air inlet can be equipped with a fan (axial fan), and the exhaust outlet if possible Install a decorative panel. For safety and beauty, a fan decorative panel can be installed on the outside of the air inlet.
2) If the environment of the work site is not ideal, containing dust, oil mist, water vapor, etc., which affect the normal operation of various components in the electrical control cabinet, then L series filter fan sets should be selected at the air inlet and the exhaust outlet Filter grid to prevent dust, oil mist, water vapor, etc. from entering the electrical control cabinet. GU is simple and convenient, and the filter mat can be easily replaced. Filter mats are generally divided into non-woven fiber filter mats and fine filter mats. The non-woven fiber filter mat is used to prevent dust particles above 10 microns, and the fine filter mat is used to prevent dust particles below 10 microns.
The selection of the fan (filter fan) can be selected in the fan characteristic curve table according to the difference between the temperature in the cabinet and the ambient temperature and the heat loss in the cabinet.
Two, heat exchanger
When the air circulation inside and outside the cabinet requires isolation, a heat exchanger can also be considered.
According to its cooling medium, heat exchangers can be generally divided into: air/air heat exchanger (cooling medium is air), air/water heat exchanger (cooling medium is water). According to the installation method, they can be divided into: wall-mounted and top-mounted.
The air/air heat exchanger has two isolated air flow spaces, one is connected to the electrical control cabinet and the other is connected to the outside space. The hot air in the cabinet is sucked into the heat exchanger, and the heat of the hot air is passed through the heat sink. The heat pipe is transferred to the other end of the heat exchanger, and then the heat is discharged to the atmosphere through the flow of outside air. The prerequisite for using this heat exchanger is that the ambient temperature must be lower than the temperature in the cabinet.
The working principle of the air/water heat exchanger is the same as that of the air/air heat exchanger, except that the cooling medium is water. Its advantage is that it is specially used in places with a lot of dust, oil and high heat load. The power of the heat exchanger can be changed by adjusting the inlet water temperature and flow rate. However, there must be a water source.
The selection of heat exchangers is similar to the selection of fans and air conditioners.

Heat dissipation of electrical control cabinet
3. Air conditioning
The fan is suitable for the cabinet temperature higher than the ambient temperature, but when the ambient temperature is higher than the cabinet temperature or the ambient temperature is higher than the required temperature in the cabinet (generally 35 ℃), then you should consider using industrial air conditioners. In addition, when the air circulation inside and outside the cabinet is required to be isolated, industrial air conditioners should also be considered.
The air conditioner adopts the compressor refrigeration principle for powerful refrigeration and realizes constant temperature control of the internal temperature of the electrical control cabinet. Since the air circulation inside and outside the electrical control cabinet is isolated from each other, it can effectively prevent harmful, humid gas and dust from entering the cabinet.
According to their installation methods, air conditioners can generally be divided into wall-mounted (side-mounted, embedded and rack-mounted in the cabinet) and top-mounted.
The selection of air conditioners is also based on the difference between the temperature in the cabinet and the ambient temperature and the heat loss in the cabinet to determine the cooling capacity required by the air conditioner. Now it is generally selected according to the empirical formula provided by the German company.
Four, other
1) If the environment of the work site is ideal, there are few heating components in the electrical control cabinet, and the heat generation can be solved by the heat dissipation of the cabinet itself, heat dissipation measures may not be considered.
2) When the ambient temperature is relatively high, or for other reasons, the above heat dissipation method is not suitable, it may be necessary to establish an electrical control room to place the electrical control cabinet. The electrical control room can be established far away from the site, so that it will not be affected by the site, but it will increase the cost of cable laying, civil construction, air conditioning installation, etc., and it is very inconvenient for frequent operations; it can also be established At the site, it may be affected by the site, but it can save a lot of cable laying costs, only the cost of civil construction and air conditioning installation, and the operation is convenient. The easiest way is to use aluminum alloy to build an electrical control room on site, which can basically eliminate the impact of the site on the electrical control cabinet. This is a simple and easy method.

Cabinet cooler
A refrigeration appliance. After the compressed air flows through the vortex tube, it becomes two streams of cold and hot air. The hot air flow is discharged at a slightly higher pressure through the vortex tube exhaust device, and the cold air flow is introduced into the heat generating part in the case through the splitter, reducing and stabilizing the internal temperature of the case, and outside air will not enter the case.
Screen cabinet cooler
How to realize the control cabinet reduction of electrical chassis/cabinet, electric control cabinet and other industrial sites
Screen cabinet cooler
Temperature and cooling and heat dissipation are a big problem. There are also many shortcomings in heat dissipation measures such as opening the cabinet door, blowing with fans and installing cabinet air conditioners. With compressed air supply, the panel cooler can perfectly solve this type of cooling and heat dissipation problems at low cost.
working principle
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The core of the panel cooler is a vortex tube. After the compressed air passes through the vortex tube, 30% of the airflow is heated by 70 degrees and then directly discharged into the air. After 70% of the airflow is cooled by 30 degrees, it is introduced into the cabinet through the hose and distributed evenly. In the cabinet, the cooling and temperature reduction of the control cabinet are realized. The hot air in the cabinet is discharged through the built-in safety exhaust port. Because of the positive pressure inside the control cabinet, the outside air and dust are shielded from the cabinet. Its protection level can reach up to IP56.
Advantages of cabinet refrigerator
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1. It is driven by compressed air only, non-electrical equipment, purely mechanical structure, no internal chemicals, no pollution. It can work when it is connected to the air source, and the temperature in the cabinet can be easily set by adjusting the compressed air flow through a ball valve.
2. Reliable operation, maintenance-free, low use cost, no moving parts, no possibility of wear, and a life span of more than 10 years.
3. Stainless steel material, corrosion-resistant, small size, weight less than 1 kg.
4. Very easy to install, just drill a small hole with a diameter of 2.86 cm in the control cabinet.
Cabinet refrigerator application
The screen cabinet refrigerator is made of stainless steel, which can be used in high temperature, high humidity, and high pollution.
Screen cabinet cooler
It can be used in harsh environments such as dyeing, high dust concentration, flammable and explosive, etc., which can keep the temperature in the control box constant, and prevent high temperature and dust from damaging the electrical equipment and components in the control box. Applied to the cooling of all control cabinets. 
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