Dynamic modulation of voltage excitation angle to optimize energy consumption of the refrigerators

• Main Authors: Kuan-Lin Wu, 吳冠霖
• Other Authors: Ho-Chiao Chuang
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/nh34s8

碩士 === 國立臺北科技大學 === 機電整合研究所 === 104 === In this study, we applied a dynamic modulation of voltage excitation angle technology, to a refrigerator so that the refrigerator operates at an optimum energy consumption. This technique utilizes a semiconductor element, Tri-electrode AC switch (TRIAC), as a regulatory element for modulating the voltage excitation angle. Thus, a novel energy saving controller (NESC) was successfully developed, and a refrigerator was used as the experimental load equipment. Refrigerators are normally operated 24 hours a day, 365 days per year; so the high power consumption of refrigerators has become a cost burden for many industries. Therefore, through this study, the problem of excessive energy consumption of refrigerators can be improved by the proposed NESC and thus, achieve the energy-saving effect. In this study, we first validated the feasibility of the proposed NESC; tests were performed where the door is closed for one hour and a dynamic simulation of normal use where the door is opened and closed periodically in one hour. The energy-saving rates obtained were 20.48% and 12.88%, respectively. In addition, a long period of one day tests on refrigerator was also conducted w/o NESC, and the best power consumption was measured at 6.597kWh 24h-1. An energy-saving rate of 22.41% was achieved. In this study, current, power, temperature and humidity inside the refrigerator compartment, and the compressor casing temperature are considered as the experimental parameters and were monitored during the test. The sensing current is taken as the feedback signal to determine the voltage modulation range. The proposed NESC is designed to be connected externally in series, without changing the original structure inside the refrigerator and it is easy to install.