EXPERIMENT ON OPTIMIZATION OF OPERATION STRATEGY AND COMPARATIVE STUDY ON THERMAL PERFORMANCE OF FLAT PLATE SOLAR COLLECTOR IN WINTER

被引：0

作者：

Fang H. ^{[1
]}

Ma J. ^{[1
]}

Chen Q. ^{[1
]}

Chen H. ^{[2
]}

Luo C. ^{[3
]}

Du T. ^{[4
]}

机构：

[1] School of Civil Engineering, Anhui Jianzhu University, Hefei

[2] School of Petroleum Engineering, Changzhou University, Changzhou

[3] School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing

[4] College of Civil Engineering, Hefei University of Technology, Hefei

来源：

Taiyangneng Xuebao/Acta Energiae Solaris Sinica | 2023年 / 44卷 / 11期

关键词：

collector efficiency; exergy; solar collectors; solar energy; thermal energy;

D O I：

10.19912/j.0254-0096.tynxb.2022-1152

中图分类号：

学科分类号：

摘要：

In order to further enhance the ability of the flat plate solar collector（FPSC）to improve the water temperature in winter，a series of experiments on the winter operation strategy of the FPSC were conducted through building experimental platform，and the heating performance as well as the applicable conditions corresponding to different operation modes，which provided a reference for the more efficient utilization of FPSC. The experimental results show that the thermal efficiency of the single FPSC can reach 63.74% under the high mass flow rate，and the index parameters of the thermal performance are excellent. However，the temperature of the water tank is low. The water temperature rise capacity of the series or parallel system is significantly higher than that of the single mode. The temperature rise exceeds 30 ℃ throughout the day，and the exergy efficiency is up to 5.15%. The thermal efficiency，convective heat transfer coefficient，and heat loss coefficient of the parallel system are 51.52%，41.95 W/ （m2·K），and 4.74 W/ （m2·K），respectively，which are significantly better than those of the series system，which are 45.33%，38.74 W/ （m2·K），and 4.81 W/ （m2·K），and the thermal performance of the parallel system is better. The operation of the system under the low mass flow rate in winter will lead to the occurrence of water flow cut-off. The internal temperature of the water tank is stratified，which is not conducive to employing high-temperature hot water. Moreover，under the high mass flow rate conditions of FPSC，reducing the water volume will shorten the available heating time and fail to absorb solar irradiation fully. Although increasing the water volume can reduce the heating loss，the temperature rise of the system will decrease，resulting in a decrease in the quality of thermal energy. © 2023 Science Press. All rights reserved.

引用

页码：174 / 181

页数：7

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