유창형 타공 태양열 집열기의 공기 유입 방식에 따른 열효율 분석
Analysis of Thermal Efficiency for Glazed Perforated Solar Collector according to Air-Inflow Method
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The government plans to apply a mandatory zero-energy building (ZEB) certification policy to public and private buildings beginning in 2025. Air-based solar collectors use air as the heat transfer medium and are classified into glazed and unglazed types. The glazed air-based solar collector has a higher thermal efficiency and reduced sensitivity to external environmental conditions compared with the unglazed type. A glazed air-based solar collector consisting of a glass panel, an absorber plate, insulation, and airflow design influenced by the inlet and absorber plate shape plays a key role in thermal performance. In particular, uniform airflow inside the collector ensures efficient heat transfer and enhances thermal efficiency. Therefore, achieving uniform airflow distribution is essential for improving the thermal performance of air-based solar collectors. In this study, the thermal efficiency of a glazed perforated solar collector was analyzed using different air inflow methods. Outdoor experiments were conducted according to ISO 9806 using closed-loop and open-to-ambient test circuits. Three air inflow methods were tested to evaluate their impact on thermal efficiency. The results showed that at a maximum airflow rate of 150 ㎥/h, the collector’s efficiency reached 61.01%, which was 35.16% higher than the base case.
Abstract
The government plans to apply a mandatory zero-energy building (ZEB) certification policy to public and private buildings beginning in 2025. Air-based solar collectors use air as the heat transfer medium and are classified into glazed and unglazed types. The glazed air-based solar collector has a higher thermal efficiency and reduced sensitivity to external environmental conditions compared with the unglazed type. A glazed air-based solar collector consisting of a glass panel, an absorber plate, insulation, and airflow design influenced by the inlet and absorber plate shape plays a key role in thermal performance. In particular, uniform airflow inside the collector ensures efficient heat transfer and enhances thermal efficiency. Therefore, achieving uniform airflow distribution is essential for improving the thermal performance of air-based solar collectors. In this study, the thermal efficiency of a glazed perforated solar collector was analyzed using different air inflow methods. Outdoor experiments were conducted according to ISO 9806 using closed-loop and open-to-ambient test circuits. Three air inflow methods were tested to evaluate their impact on thermal efficiency. The results showed that at a maximum airflow rate of 150 ㎥/h, the collector’s efficiency reached 61.01%, which was 35.16% higher than the base case.