Comparison between Innovative and Traditional Ventilation Systemin Indoor Air Quality Improvement Simulation-A Case Study of Lecture Hall at Yuntech

• Main Authors: Shin-miau Liau, 廖鑫淼
• Other Authors: none
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/06356661443609629213

碩士 === 雲林科技大學 === 環境與安全工程系碩士班 === 98 === According to the literature on indoor activities, students in general longer than the time in outdoor activities, 12% more. Indoor air quality ventilation system will affect these indices, thereby affecting the efficiency of students and teachers, among which the most easy to produce CO2, but most easily overlooked. The purpose of this study Yunlin University of Science Lecture Hall, for example, innovation mechanical ventilation system (installed on the inside window frame) and conventional mechanical ventilation system (installed in the seat bottom) of the physical nature of simulation. In this study, the use of PHOENICS software CFD (Computational Fluid Dynamics) simulation. The results demonstrate that most of the velocity field, with innovative and traditional mechanical ventilation system of the indoor average wind speed are higher than the current status of 2 times. Velocity field by the indoor indoor air inlet and outlet geometry and relative positions of significant influence, such as increasing distance from the curved wall and the turbulence phenomenon is more significant. The temperature field simulation in part, at present the current status of this Lecture the indoor average temperature is 27.2 ℃, plus the traditional ventilation systems and innovative design the ventilation system were lower than the current situation of 5.4 ℃ and 4.4 ℃, due to mechanical ventilation and cooling, but officers of the heat source temperature and the window frames pass effect. CO2 concentration field in part due to the relative position of inlet and outlet effects, innovative ventilation system than the traditional 72% higher discharge capacity, in addition,multiple air vents with mechanical equipment impact, making innovative ventilation system and more emissions than the current status of 89% of the CO2. In staff rest areas (0 ~ 350cm) CO2 concentration variation, in the current status of the lecture hall, the high CO2 concentration regardless of any amount are more than in 585ppm. Due to the traditional ventilation fan installed in ladder below the seat, change the overall height difference between the maximum and minimum values within ± 5ppm. Innovative ventilation system office staff rest area 90cm high CO2 concentration, because CO2 molecules in the office below or spread the cumulative result of slow changes in its value were maintained at between 550 ~ 600ppm. Three models of air exchange rates were 21.2% for the current situation, 46.8% of traditional ventilation systems, innovative ventilation system is 50%, before both of them have short flow phenomena, and innovative ventilation system is the phenomenon is completely mixed. Therefore, this study due to the installation of ventilation systems that innovation in the window frame in position to make itself a heat effect and modification easy ... and so on, the innovation by the simulation that the ventilation system and the study due to the relative position of inlet and outlet To better the air exchange rate and reduce the rate of CO2 than traditional ventilation systems are good.