Desktop Personal Computer 內附의 流動特性에 관한 硏究

Abstract

Rapid development of CPU integrated circuit has brought rapidincrease 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. However, as Desktop Personal Computer is getting smaller and more heat is found in CPU and PC because of integrated CPU, an effective technology to discharge heat out of PC case is needed. As flowing in PC case makes whirling spirals in the center of the case by Fan installed in different axis directions, efficiency of air inhalation discharge is lower and noise is found. When peripheral equipment is installed, air with whirling spirals between bottom Slot and bottom case is stagnant. Therefore, this study is to identify flowing inhaled and discharged inside and outside of the PC case and cooling efficiency of CPU in a design of PC case. 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) When Slots are installed in PC, large and small parasites between Slots and bottom occur, which influences the entire flowing inside PC and makes noise in inhalation and discharge. 2) In left top which is not directly influenced by inhalation and discharge Fans loaded in PC, flowing occurs because of pressure differences in parasites occurring in the middle of PC. 3) For operation of CPU Fan, flowing distribution is more definitely found in the upper of the case compared to when the Fan is not operated. However, as CPU Fan moves clockwise, more definite parasites occurs between CPU Fan and Slots. It is found when fluid inhaled from the inhalation Fan has reverse strength while flowing toward the discharge Fan. 4) The parasites occurring in the middle of CPU Fan is smaller as the gap between CPU Fan and Slot is larger. It influences flowing in left top of the case which is hardly found when the CPU Fan is not operated. However, it is believed that operation of CPU Fan does not influence flowing between Slots and the bottom of the case.