Safety of 24 v DC Cooling Fan

"24V DC Cooling Fan" at work (assuming no heat transfer with the outside room) not only did not reduce the indoor temperature, it will rise. Let us analyze a temperature rise causes: "24V DC Cooling Fan" work, since the current through fan coil wire is resistance, it will inevitably produce heat outward heat, so the temperature It will rise. But why people will feel cool it? Because the body's surface have a lot of sweat, when after "24V DC Cooling Fan" Working together, the indoor air can flow together, so we can promote the rapid evaporation of sweat, combined with "evaporative need to absorb a lot of heat", so people will feel cool.
[The main items]
Using the process in order to reduce the low-noise must note the following:
System Impedance: Air flow resistance will cause air flow noise generation.
Airflow turbulence: due to poor design of the flow channel of air turbulence caused by high-frequency noise will appear, if it does not improve the flow channel is difficult to have a qualitative improvement. Fan speed and size: the cooling fan speed sooner the better, the greater the larger the size of the fan air flow, cooling effect is better. Fans of turn The higher the speed the greater the noise, the larger the size the larger the noise.Temperature rise: after reducing the temperature difference between the temperature rise, the cooling effect is reduced.Vibration: vibration will cause the fan noise increased, reducing life expectancy as well as the speed is reduced.Voltage fluctuation: The voltage fluctuation will cause the fan speed changes, so that job insecurity and will generate additional noise.Design considerations: Some other requirements for the design must also be taken into account, in order to ensure the cooling effect.