Numerical Analysis and Benefit Study on Various Air-Side Design Approaches in Special HVAC Systems

• Main Authors: Tsung-Che Cheng, 鄭聰哲
• Other Authors: 柯明村
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/atrncu

博士 === 國立臺北科技大學 === 機電科技研究所 === 98 === The rising of atmospheric temperature has increased the demand for air-conditioning system. This also induced a rapid increasing in electricity consumption. In order to reduce the peak power consumption in air conditioning system, we need to invite a lot of professional engineer and spend huge resource to develop more efficient technology. In this way, we can effectively reduce the energy consumption for air-conditioning systems. Therefore, the more efficient and easier way to perform the energy audit and realize the energy saving technology is needed to be developed at this stage. This also can enhance and strengthen the effectiveness of energy-saving in air-conditioning system. This research will focus on the design analysis and evaluation of air-side in the air-conditioning system for some large scale and special purpose system. We will adopt two different purposes of large air-conditioning system - high-speed computer center and mass rapid transit systems as the sample case in our study. We will perform the air-flow numerical simulation, the status of indoor air flow field measurement and improvement plan, and fire smoke in different regions for refuge plan validation with this physical model. We will review the current status of these air-conditioning systems and propose the improvement plan to improve the design specification for future construction works. The CFD (computational fluid dynamics) simulation is also employed to decide the optimum arrangement or configuration of air inlet and outlet. In this study, air conditioning design in conjunction with computational fluid dynamics simulation of airflow is performed. An improvement plan is also proposed so that a comfortable indoor temperature condition can be maintained and effectively restrain the energy consumption and comply with fire regulations. In this study, we found that the arrangement of outlet for supply air and return air shown a significant influence on the temperature distribution inside the space and energy consumption for cooing requirement. We have successful established the model to analyze the air-conditioning system for the data center and provide the useful information for the design of supply and return air port for large air-conditioning system. This study also employs the results from one-dimensional analysis as the boundary conditions of three-dimensional CFD simulation for further analysis. We have successful established the analysis model for the tunnel ventilation system. This can be employed as the design guide for the design of ventilation and fire smoke in the rapid transit system.