스피커구동 열음향 냉동기의 제작 및 성능평가

Abstract

In this study, a resonator type 1/2 wavelength thermoacoustic refrigerator is designed and fabricated according to the method suggested by Hofler. The resonance tube is 620mm in length and then theoretical resonance frequency is about 276Hz. But It was found that driving frequency was 268Hz, when thermoacoustic refrigerator was actually operated. It was a difference of 8Hz. The resonator type 1/2 Wavelength thermoacoustic refrigerator is composed of a resonator of 3.6 cm diameter, stack of plates, heat exchangers and cooling part. Length of the hot heat exchanger the stack of plates and the cold exchanger heat exchanger are 9 mm, 8 cm and 6 mm respectively. Heat exchanger are constructed by the wire cutting method. Stack of plates is of spiral type having a finite spaces of 0.6 mm and is made of Kapton. The total length of the resonator type thermocaoustic refrigerator can be different according to the kind of filling gas and the driving frequency. Maximum temperature drop of the thermocaoustic refrigerator is observed to 23.7 °C when it is operated at 268Hz of driving frequency and 100w of speaker power. The cold-part temperature of the exchanger fell to -3.1°C. When speaker power was also operated at 50W, coefficient of performance relative to carnot's coefficient of performance is 0.26% of maximum, and then cooling power was 4W.