압전구동기에 의한 열전냉각시스템의 냉각영역 성능 개선에 관한 연구

Abstract

This study focused on improving of cooling performance of thermoelectric cooling system by piezoelectric actuator. The temperature distribution was measured and thermo-flow phenomenon was visualized in the cold region of thermoelectric cooling system when the piezoelectric actuator wasn't operated and was operated with frequency of 90㎐, 120㎐ and 150㎐. The experimental device for measuring temperature distribution consisted of the thermoelectric cooling device, the piezoelectric actuator, thermocouple, data acquisition unit and PC. Temperature distribution of cold region between thermoelectric cooling system and piezoelectric actuator was visualized without and with the piezoelectric actuator as 90㎐, 120㎐ and 150㎐, and also coefficient of performance was calculated in respective conditions. The experimental device for visualization consisted of the thermoelectric cooling device, the piezoelectric actuator, He-Ne laser, CCD camera, image grabber, optic lens and PC. Thermo-flow phenomenon of cold region between thermoelectric cooling system and piezoelectric actuator was visualized without and with the piezoelectric actuator. As a results of measuring temperature distribution and calculating coefficient of performance, vibration from piezoelectric actuator was improved the cooling performance of the thermoelectric cooling system, but quantity of improvement was different in accordance with frequency. When the result of measuring temperature distribution was compared with the result of flow visualization, the cold air in cold region was actively circulated in cold region by compulsive convection generated from piezoelectric actuator. As the result, cooling performance of cold region was improved.