Experimental and theoretical study of the efficiency of a dual-function solar collector

Ma, Jinwei; Sun, Wei; Ji, Jie; Zhang, Yang; Zhang, Aifeng; Fan, Wen

doi:10.1016/j.applthermaleng.2011.02.019

Cited by 50 publications

(20 citation statements)

References 15 publications

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“…To give a brief, Assari et al [6] and Nematollahi et al [7,8] reported on the thermal performance of a dual purpose solar collector while two fluids (water and air) in the collector flow simultaneously, indicating that better performance can be obtained compared to single purpose collector. Ji et al [9] and Ma et al [10] performed the performance of dualfunction solar collector experimentally and theoretically and obtained good thermal performance in both air heating mode and water heating mode. Further, Ji et al [11] presented a new design of tri-functional photovoltaic/thermal solar collector.…”

Section: Introductionmentioning

confidence: 97%

CFD and comparative study on the dual-function solar collectors with and without tile-shaped covers in water heating mode

Hong

Luo

et al. 2016

Renewable Energy

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a b s t r a c tThis paper presents a dedicated study of a novel tile-shaped dual-function solar collector in water heating mode by using computational fluid dynamics (CFD). This system employs a modular panel incorporating tile-shaped covers that is able to serve as part of building pitched roof, thus creating a building integrated, highly efficient and aesthetically appealing solar heating structure, particularly suitable for the Chinese traditional buildings. A complete 3D CFD model was developed. The numerical prediction was validated using experimental data. It was found that the established model is able to predict the operational performance of the system at reasonable accuracy. With the specified system structure, the efficiency of the solar system was found to be a function of its operational conditions. The results indicated that lower inlet water temperature, higher water flow rate, higher ambient air temperature and lower solar radiation led to enhanced thermal efficiency of the module. Further, the performance of the dual-function solar collector with and without tile-shaped covers was comparatively studied. It was found that the tile-shaped collector is able to achieve higher efficiency at higher temperature operation. This work outlines the impacts of the main operational conditions to the tile-shaped dual-function solar collector's efficiency.

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Section: Introductionmentioning

confidence: 97%

CFD and comparative study on the dual-function solar collectors with and without tile-shaped covers in water heating mode

Hong

Luo

et al. 2016

Renewable Energy

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“…However, there are some drawbacks in collectors, such as complex structure, unmatched appearance and installation difficulty. Ji [1] and Ma [2] proposed the idea of the dual-function solar collector. Air flow channels are introduced to conventional sheet-and-tube solar water collectors so that the collector can provide heat air in winter.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Water Heating Performance of a Novel Tile-shaped Dual-function Solar Collector

et al. 2015

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Solar collectors are widely used in buildings for energy saving. However, the conventional solar collector does not match the tile roof of the building in appearance. To solve this problem, we propose a novel dual-function solar collector with tile-shaped Polymeric Methyl Methacrylate (PMMA) covers to match the roof appearance. This novel dual-function solar collector can provide hot air in winter and hot water in other seasons, with high annual solar thermal utilization ratio. Experiments are conducted to investigate the performance of the tile-shaped collector. The efficiency of the novel tile-shaped dual-function solar collector varied from 53.2% to 69.1% in water heating mode in the test. The daily thermal efficiency of the water heating system with this tile-shaped collector system varied from 54.0% to 61.8%, while the daily thermal efficiency of the dual-function solar collector with semicircle covers varied from 44.7% to 59.2%, compared with the daily efficiency of the conventional dualfunction solar collector without PMMA covers varied from 35.5% to 67.4%. It shows that the tile-shaped collector can greatly integrate the solar collector technology in to the local special feature buildings with slightly decrease of thermal efficiency.

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“…Especially in summer, the electrical efficiency of PV/T air collector is limited due to the lack of ventilation and overheating protection of PV cells. In order to make the solar collector work effectively all over the year, the idea of dual-function solar collector was proposed by Ji et al [18] and Ma et al [19]. Air flow channel was introduced to conventional sheet-and-tube solar water collectors to perform the air heating function.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation and experimental validation of tri-functional photovoltaic/thermal solar collector

Guo

Sun

et al. 2015

Energy

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130

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Experimental and theoretical study of the efficiency of a dual-function solar collector

Cited by 50 publications

References 15 publications

CFD and comparative study on the dual-function solar collectors with and without tile-shaped covers in water heating mode

CFD and comparative study on the dual-function solar collectors with and without tile-shaped covers in water heating mode

Experimental Study of the Water Heating Performance of a Novel Tile-shaped Dual-function Solar Collector

Numerical simulation and experimental validation of tri-functional photovoltaic/thermal solar collector

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