Browsing by Author "Wu, Yu-Lieh"

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A Novel Condensate-Free Refrigerated Cold Plate for Electronic Cooling
(2010-01-01)
Wu, Yu-Lieh
;
Yang, Kai-Shing
;
Chen, Min-Yi
;
Wang, Chi-Chuan
;
機械工程學系
A novel cooling design featuring a two-stage expansion process is proposed in this study. Without any help from insulation, the design can minimize or even entirely eliminate condensate formation outside the cold-plate surface even for a very low evaporation temperature. The design incorporates a double-pipe inlet/outlet and a two-container cold plate, and its performance is compared to a conventional cold plate. For the conventional cold plate, the outlet pressure/temperature hold quite steadily at a light heat load, and the outlet pressure/temperature shows a substantial rise when the refrigerant is completely evaporated. The outlet pressure/temperature of the condensate-free cold plate shows an opposite trend at a heavy heat loading. The benefit of this characteristic is that the wall surface temperature and the outlet temperature of the cold plate can be maintained comparatively more steady than the conventional cold plate.
The Effect of Ventilation Types on Pollutant Removal in a Large Space Plant with Multiple Pollutant Sources
(2011-10-01)
Huang, Jeng-Ming
;
Hsu, Shou-Ping
;
Wu, Yu-Lieh
;
Chen, Hung-Yuen
;
Wang, Chi-Chuan
This study numerically investigated the influences of ventilation designs on pollutant removal in a large space with multiple pollutant sources. The types of ventilation include general displacement and local exhaust ventilation with either partitioned or non-partitioned working field. The study demonstrated that the outlet positions and outlet flow rate distribution for local exhaust ventilation are more important than those of the general displacement type. It would be more effective to design local exhaust by placing the outlets on the midstream and downstream of the machines rather than on all the machines. The results also demonstrated that the effect of local exhaust type would not be more superior to the general displacement type due to the large space in plant and multiple pollutant sources such as oil gas pollutant source, mist of metalworking fluid, etc.