Heat dissipation issues for control system equipment such as DCS/SIS/GDS system cabinets, operator stations, and large display screens
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In the process of automatic control design for industrial facilities, large-scale plants contain numerous control system cabinets and devices. The value of the heat generation per device has a significant impact on the cooling capacity required by the constant temperature and humidity air conditioning systems as well as on the selection of equipment. How can an accurate estimate of this heat generation be obtained? Are there any relevant specifications or standards that can be referred to? Normally, during design, estimates are made based on past experience; the heat dissipation values provided by integrators (some of whom simply use the power rating as the heat dissipation value) tend to be on the high side. It would be desirable to find a more accurate and simple method of calculation.
When calculating the heat dissipation of control system equipment, relevant industry standards or technical specifications provided by the manufacturer can be referred to. First, check the power consumption data in the device specifications, as this is usually the main factor determining the amount of heat dissipation required. Secondly, the heat dissipation amount can be calculated using the following formula: Heat dissipation (watts) = Equipment power (watts) × Efficiency. The efficiency can generally be obtained from the equipment manual or by consulting the manufacturer, depending on the type and design of the equipment. In addition, it is also possible to refer to the cooling standards for data centers or industrial automation equipment published by organizations such as IEEE and ASHRAE. Ensure that all factors that may affect heat dissipation are taken into account during design, such as cabinet layout and air flow paths, in order to improve the accuracy of calculations. .
GB T 40815-2021 Mechanical structures for electrical and electronic equipment – Thermal management for cabinets in both imperial and metric series. GB T 24276-2017 A method for verifying the temperature rise of low-voltage switchgear and control equipment through calculations. There are also specialized works available