On-Site Thermal Performance Evaluation of Flat Plate and Evacuated Tube Solar Collectors

Song Seop Lee; Hee Won Lim; Wang Je Lee; Kyung Ho Lee; U Cheul Shin

doi:10.7836/kses.2024.44.5.011

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2024 Vol.44, Issue 5 Preview Page Next Page

Research Article

On-Site Thermal Performance Evaluation of Flat Plate and Evacuated Tube Solar Collectors 평판형 및 진공관형 태양열집열기 현장 열성능 평가

30 October 2024. pp. 11-22

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Abstract

The deployment of solar thermal systems in Korea has predominantly focused on low-temperature applications, such as domestic hot water and space heating. The solar collectors used for these applications are limited to liquid-type flat-plate and evacuated-tube collectors. However, there is a notable absence of domestic performance standards or guidelines for evaluating the thermal performance of these collectors during the design phase of low-temperature solar thermal systems. To address this gap, this study compared the performance of these collectors by analyzing the dynamic behavior and thermal performance characteristics of a solar space heating system in a greenhouse. Both flat-plate and evacuated-tube collectors were used simultaneously in the system. The results are summarized as follows. First, the solar space heating system operated within the low-temperature range throughout the year. Second, incident angle loss, indicating efficiency degradation relative to the certified efficiency of the tube collectors, ranged from 9.5 to 17.0%, during winter and summer, while flat-plate collectors exhibited a higher loss of 26.1 to 31.2%. However, flat-plate collectors exhibited higher average instantaneous efficiency during these periods. Finally, the total annual solar heat gain for the flat-plate collectors was 542.0 kWh/m², which is approximately 20% higher than the 451.9 kWh/m² recorded for the evacuated-tube collectors.

Keywords

Incident angle modifier

Evacuated tube collector

Collector efficiency

Flat plate collector

키워드

입사각 수정인자

진공관형 집열기

집열기 효율

평판형 집열기

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Information

Publisher :Korean Solar Energy Society
Publisher(Ko) :한국태양에너지학회
Journal Title :Journal of the Korean Solar Energy Society
Journal Title(Ko) :한국태양에너지학회 논문집
Volume : 44
No :5
Pages :11-22
Received Date : 2024-08-27
Revised Date : 2024-09-20
Accepted Date : 2024-09-23
DOI :https://doi.org/10.7836/kses.2024.44.5.011

Journal of the Korean Solar Energy Society ISSN:1598-6411(Print) 2508-3562(Online) 한국태양에너지학회 논문집

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