Air pressure and airflow of low-noise dc cooling fan are two relative concepts. Generally speaking, it is necessary to sacrifice some air pressure for larger airflow in the consideration of cost reduction when manufacturing dc cooling fan. If the fan can drive a large amount of airflow while the air pressure is small, the air will not blow to the bottom of the radiator (this is why the cooling effect of some fans is not good while they have high speed and large airflow). On the contrary, large air pressure often means that the airflow is small, and there is not enough cold air for cooling with the radiator, which will also cause a poor cooling effect.
Any type of radiator is basically inseparable from the following three cooling ways, but the focus is different.
1. Heat conduction, heat convection and heat radiation. When matter itself or matter contacts with matter to cool down, the transfer of energy is called heat conduction, which is the most common cooling way. For example, the way that the chassis of CPU radiator directly contacts with the CPU to take away heat belongs to heat conduction.
2. Heat convection: it refers to the heat transfer mode in which the flowing fluid (gas or liquid) takes away the heat. In the cooling system of computer case, the common cooling mode is the forced heat convection mode in which the cooling fan drives away the airflow.
3. Heat radiation: it refers to heat transfer relying on radiation and the most common one is solar radiation in daily life. These three ways of cooling are not isolated. In daily heat transfer, these three ways of heat dissipation occur at the same time and work together.
For example, as to the common CPU air-cooled cooling fan, the CPU radiator is in direct contact with the CPU surface, and then the heat on the CPU surface is transferred to the CPU radiator through heat conduction; the DC cooling fan generates airflow to transfer the heat on the surface of the CPU radiator through heat convection, and the airflow in the chassis also transfers the heat on the surface of the CPU through heat convection; The heat of the air around the case is taken away to the outside of the chassis through heat convection; at the same time, all the parts with high temperature will radiate to the parts with low temperature.
As for the manufacturing of dc cooling fan, Dongguan Wanhang Electronic Technology Co., Ltd. is professional and welcome to buy it!