ISSN 0254-0096　CN 11-2082/K

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### 平板太阳能集热器热损系数及稳定性研究

1. 1.云南师范大学太阳能研究所,昆明 650500;
2.哈尔滨工业大学（威海）新能源学院,威海 264209;
3.哈尔滨工业大学能源科学与工程学院,哈尔滨 150001
• 收稿日期:2020-03-24 出版日期:2022-02-28 发布日期:2022-08-28
• 通讯作者: 李明（1964—）,男,博士、教授,主要从事太阳能光热、光伏以及制冷方面的研究。lmllldy@126.com
• 基金资助:
国家科技支撑计划（2015BAA02B00）; 中国-老挝可再生能源开发与利用联合实验室（2015DFA60120）; 国家自然科学基金（51966019）

### RESEARCH ON HEAT LOSS COEFFICIENT AND STABILITY FOR FLAT-PLATE SOLAR COLLECTORS

Yang Luwei1, Li Ming1, Wang Fuqiang2, Gao Wenfeng1, Wang Wei3

1. 1. Solar Energy Research Institute, Yunnan Normal University, Kunming 650500, China;
2. School of Energy Science and Engineering, Harbin Institute of Technology, Weihai 264209, China;
3. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
• Received:2020-03-24 Online:2022-02-28 Published:2022-08-28

Abstract: To analyze the effect of un-load exposure on the heat loss of flat-plate collectors（FPCs）, the thermal performance of three different coatings（the blue-film coating, the anode oxidizing coating and the black chromium coating） of FPCs were tested by the quasi-steady state method. In addition, the variation trend of heat loss with the average temperature of the heat absorbing plate, inclination angle and wind speed were also analyzed. The results show that after un-load exposure aging, the total heat loss coefficient （the blue-film,the anode oxidizing and the black chromium） of the FPCs is 5.0724, 5.2457 and 5.9961 W/（m2·K） respectively. The emissivity of the coating and the average temperature of the heat absorbing plate are the decisive factors for the total heat loss coefficient. Wind speed and inclination angle are the important factors for the total heat loss coefficient, and the environment temperature has little effect on the total heat loss coefficient. The relative error of the total heat loss coefficient obtained by theoretical calculation and the fitting of experimental data is not more than 4%, which shows the better accuracy of the calculation results for the FPCs with different coatings. The observation and analysis by the SEM, it is shown that the black chromium and anode oxidizing coating are superior to the blue-film coating in corrosion resistance, oxidation resistance and thermal stability. Avoiding the long-term high un-load exposure of the FPCs and reducing the emissivity of the coatings can effectively reduce the total heat loss coefficient of flat solar collector.