Sirocco－Fan에 의한 Desktop Personal Computer 內附의 速度分布 特性에 관한 硏究

Abstract

Rapid development of CPU integrated circuit has brought rapid increase of electronic equipment quality including computers. Developed technology that to integrate CPU chips on printed circuit board has brought acceleration of micro and higher-density electronic systems. In particular, Desktop Personal Computer needs increased power consumption of CUP and PC is getting thinner. Therefore, heat design of PC has been considered as a worse condition. PC inside is air-conditioned with a use of radiator grille, heat pipe and Fan. Due to intensive development of CPU, more heat are producing in CPU and inside the PC case. So a technology to discharge the heat outside the case efficiently is required. This study analyses axis-direction velocity distribution, 2nd flowing distribution, shearing stress distribution, pressure distribution, and kinetic energy distribution occurring inside the PC case, changing Slot factors in respect to installation of air inflow and discharge Fan, Sirocco-Fan which discharges air in PC, and peripheral devices and presents information on design of PC cases. It is to study flowing characteristics inside the desktop personal computers with a use of PIV test. Under the condition that inhalation and discharge Fans are operated, particles of ZnO(tracing particles) are diffused into the mouth of the duct to measure the characteristics. The results of the test are summarized as follows. (1) Many vectors are distributed in right middle of the case because of Sirocco-Fan installed in discharge direction. It has a great influence on discharge of inside flowing in PC. (2) In left top which is not directly influenced by inhalation and discharge Fans installed inside the PC, flowing occurs because of pressure differences of Sirocco-Fan installed in the right center. (3) Flowing occurs more definitely in bottom of the case when Sirocco-Fan is operated compared to when it is not operated. However, when the Sirocco-Fan is operated in discharge direction, more parasites between Slots and inhalation Fans are found. It is thought that it is influenced by the sirocco-Fan while fluid inhaled from inhalation Fan flows to the discharge Fan.