Computer  power  dissipation  into  the  era  of  people-oriented
Date：2014-1-21 5:06:24 | Classification：Article info

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Although the power of CPU and graphics features like temperature sensors, but from the rear of the chassis power outlet location is very easy to measure the temperature of the power supply . Now multimeter with temperature probe in general , the multimeter temperature probe wrapped with insulating material such as plastic look inside , stretching from the position of the rear of the chassis power supply , as long as there is time and patience , you can measure the temperature of the power of multiple locations . The infrared thermometer can be carried throughout the full range of fast power measurement of the temperature , just from the rear of the chassis align the various parts of the infrared thermometer inside the power supply , you can quickly and easily read throughout the internal power supply temperature. Tests show that centralized gas supply fresh air cooling fanless computer with the power supply temperature than the fan power is much lower , like 5 to 10 degrees , and the above analysis generally consistent . This shows that , in the centralized supply of fresh air cooling computers , fanless power supply cost and traditional fan cooling power roughly when the computer enters the era of people-oriented , high fan speed and noise due to the apparent loss of real value , basically seen only in the media evaluation ; multicore era when the computer enters the heat , the fan speed is low due to the increased volume of the requirements of the radiator due to various constraints , in practice it is difficult to see . Visible , a moderate fan speed is the basic requirement of all silent computers , on this basis , the pursuit of the ultimate silent PC must also further reduce the number of fans.
The key centralized gas supply fresh air cooling computers is to achieve a breakthrough achieved mute centralized heat supply computer and fresh air cooling, and central air-conditioning of buildings have the same purpose , do not like the traditional computer to install the fan in the power supply, CPU and graphics card separately for gas. Centralized heat supply fresh air to the right amount of attention to computer fans, moderate speed to strike a balance between silent and cooling the computer . The amount of the minimum number is a fan ; moderate speed on the 120mm fan is about 1300rpm, for 180mm fan is about 900rpm. At moderate speed, large diameter smaller than the diameter of the fan has a better cooling effect, a number of fans have a better cooling effect than a single fan. Pursuit of the ultimate muted effect , you can use a fan ; pursuit of the ultimate cooling effect , you can use large diameter fan or multiple fans . That is, the pressure difference between the overall heat balance and heat can not only silent , but also between silent and cooling also has a considerable degree of flexibility.
Centralized gas supply fresh air cooling system cooling and heat capacity can be calculated by the following method .
Computer fan in common diameter 120mm for example, the speed of the air volume of around 1300rpm 50CFM (Cubic Feet per Minute, 1CFM = 4.72 × 10-4m3 / s). Let airflow into the enclosure when the temperature is 28 ℃, the temperature of the discharge when the chassis is 38 ℃, the temperature difference is 10 ℃ ( or K), heat per unit of time caliber 120mm exhaust fan to the outside of the chassis as follows: ( more than hot air : proportion 1.005J/gK, air : 1290g/m3)
Q = c? M? Δt
= 1.005 × (50 × 4.72 × 10-4 × 1290) × 10
= 305.96 watts
Currently, the vast majority of computer heat in 300 watts , especially the general configuration of the computer , its whole power was about 200 watts, not far from the heat to 300 watts.
This formula above description of the system from the perspective of a centralized supply of fresh air cooling system , air is equivalent to the input , the output is equivalent to the heat flow away , specific heat equivalent system functions. Of course , in the design of centralized gas supply fresh air cooling system power supply, CPU , fanless heatsink , graphics fanless cooling device , also used thermal design theory . Heat is proportional to the area of thermal design theory, radiator fan and the radiator cooling capacity , and traffic flow is proportional to the temperature difference between the surface and the air flow is proportional to the radiator , the radiator can be sized accordingly distribution planning and traffic flow .

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