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With the PV inverter dimensions shrink and stand-alone power is increased, the thermal design of the increasingly high demand. Designers must be integrated into the inverter cooling system cooling effect, protective, can be installed, maintainability, and pay economic price. Among them, single power, is an important basis for the design of the cooling solution.
The inverter cooling technology including natural cooling, forced air cooling, liquid cooling and phase change cooling and other forms. Studies have shown that forced air cooling is natural cooling efficiency 10 to 20 times more efficient heat dissipation as well as liquid cooling. From the complexity of the structure and ease of implementation, the forced air cooling system than the liquid cooling system is simple, easy to implement, high reliability. Thus, in the power industry forced air cooling method of choice, followed by consideration of natural cooling, liquid cooling and other cooling methods.
Heat flux density is the unit of time, by the heat of an object on the unit cross-sectional area. Allowed in the same temperature range, the system heat flux, the more demanding the required cooling.
Typically, electronic components within the allowable working temperature in the range of 40 ~ 60 ℃. Maximum allowed under the conditions of temperature 60 ℃, natural cooling can assume the maximum heat flux density of 0.05W / cm2. When the heat flux is greater than 0.05W / cm2, but by some special means to improve the cooling effect of natural cooling reluctantly, but need to sacrifice performance, or economic life of the device and the like as the price. When the heat flux density is greater than 0.05W / cm2, using forced air cooling method, obtained a satisfactory overall performance and economy. When the heat flux density continues to increase, you need to select other liquid-cooled heat dissipation and so on. For all the power of a few MW large wind energy converters, cooling methods are optional liquid cooling; power between 100KW to 1MW concentrated photovoltaic inverter, forced air cooling way; and the power from a few kilowatts to several ten kilowatts of photovoltaic string inverters, according to stand-alone power from small to large, thermal design to enhance the natural heat from the forced air cooling.
The theoretical analysis into actual products in the cooling solution is relatively select, Scientific Steering string PV inverter cooling solution for applications in product design. When the power is less than 20kW, using natural cooling can achieve product volume, weight and overall performance to match the best; when power is greater than 25kW, the heat flux density, forced air cooling is more economical, efficient and practical means; when the power between 20kW to 25kW, integrated cost-effective use of natural cooling and forced air generated considerable.
Summary: cooling technology including natural cooling, forced air cooling, liquid cooling, phase change cooling, etc., mainly selected according to the inverter power.
String PV inverters generally operate at above 70 ℃ rooftop outdoor environment, high temperature environment affect system performance and longevity of cooling products is particularly important. Less power 20kW inverter, you can use natural cooling; and power above 25kW inverter, forced air cooling is more appropriate.
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