| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 87 === This thesis evaluates certain important techniques of duct system design and simulation. The methods include constant velocity method, velocity reduction method, equal friction method, static regain method, T-method optimization, and T-method simulation. Based on the theories, we also develop a computer-aided design and simulation software.
The software is written in C++ language and applicable to 32-bit Windows operating system. A database of loss coefficient was also constructed so that the program could automatically access these data. The design software will be useful in selecting preferred method, saving significant design time, and achieving optimal design, while the simulation software helps engineers instantly acquire the system performance data without test and experiment.
To analyze and evaluate the design methods comprehensively, we compare design data in various aspects, such as duct size, fan total pressure, velocity range, balance rate, and cost. The results show that T-method optimization is the best because it is able to accomplish the minimum life-cycle cost and ensure the balance of the system. Furthermore, the influences of design parameter variations in each method are investigated. According to the results, the proper design strategies are performed in order to optimize the system cost.
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