외기온도 변화에 대한 공기식 태양열 집열기의 열성능 신뢰성 검토 연구

Abstract

Solar air collector is a technology that uses the solar radiation heat energy as a heat source forthe ventilation and heating of buildings to reduce energy consumption. According to ISO 9806solar air collector thermal performance evaluation, an indoor performance evaluation methoduses a solar radiation simulator in indoor chambers, and an outdoor performance evaluationmethod uses natural solar radiation in outdoors. The thermal performance evaluation has toensure the reliability of the thermal performance of the collector using the outdoor performanceevaluation method that is affected by the changes in the seasonal outside air temperature. Thisstudy compared and analyzed the thermal performance of the glazed solar air collectordepending on ambient temperature variations in February, March, and April. The averageoutside air temperature was –0.5°C in February, 13.4°C in March, and 21.1°C in April. Theexperiment indicated that the solar air collector thermal performance was 68.1% in February,68.5% in March, and 63.8% in April and the temperature difference between the inlet and outletwith 1000 W/m2condition was 29.2°C in February, 27.5°C in March, and 29.0°C in April. These results indicated that seasonal ambient temperature variations had a small effect on thesolar air collector thermal performance evaluation. Therefore, the result of the outdoor solar aircollector thermal performance evaluation was reliable irrespective of the seasonal ambienttemperature changes.