Investigation on the daylight and overall energy performance of semi-transparent photovoltaic facades in cold climatic regions of China

Cheng, Yonghua; Gao, Min; Dong, Jiankai; Jia, Jie; Zhao, Xudong; Li, Guiqiang

doi:10.1016/j.apenergy.2018.10.006

Cited by 52 publications

(18 citation statements)

References 21 publications

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“…In the evening the solar radiation drops abruptly from 5 pm to 6 pm additionally due to the shadding e ect. is observation agrees with the author Cheng et al [41] in climatic regions of China were shading has an e ect on power generation because during shading there is drop of solar irradiance. Also, the uctuations of monitored parameters were due to the change in environmental conditions caused by either increased or decreased wind speed, unprolonged cloud cover or irradiance uctuations were also observed by [42] in climatic condition of Tanzania.…”

Section: Testing Of Electrical and Opticalsupporting

confidence: 92%

Semi-Transparent Building Integrated Photovoltaic Solar Glazing: Investigations of Electrical and Optical Performances for Window Applications in Tropical Region

2019

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Integrating solar PV technology with semi-transparent windows permits multifunctional operation as electricity generation and allowing natural light to enter the building, hence overall energy efficiency improvement. The performance of the semi-transparent building integrated PV glazing on office building facade has been investigated in Tanzania’s tropical climate. Experimental measurements of the electrical and optical parameters for the system efficacy evaluation were done at various conditions which included cloudy, normal, and clear sky days. The weather parameters under consideration were solar irradiance, air temperature, relative humidity, and wind speed. The experimental set-up consisted of building integrated silicon mono crystalline semi-transparent PV module rated at 50 W and accessories. The I-V and P-V curves were measured at different irradiances. Throughout the experiment, the observed module temperature was between 20°C and 51°C and the air temperature was 17–33°C while the humidity was recorded at the range of 23–63%. Module electrical efficiency was observed to vary from 4% to 9% while the visible light transmission was obtained between 11% and 19%. It was proved that at high temperature regardless of irradiance increase, there were observed output power and efficiency drops caused by high heat losses.

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Section: Testing Of Electrical and Opticalsupporting

confidence: 92%

Semi-Transparent Building Integrated Photovoltaic Solar Glazing: Investigations of Electrical and Optical Performances for Window Applications in Tropical Region

2019

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“…The dynamic daylight evaluation index has been widely used in the recent research on daylight performance, such as DA, sDA, UDI, and ASE. The DA index was originally proposed by the Swiss Electric Association in 1989 and was further developed to measure the percentage of occupied hours [55]. UDI is defined as the illuminance falling in the range of 100-2000 lx [56].…”

Section: Authormentioning

confidence: 99%

A Study on Parametric Design Method for Optimization of Daylight in Commercial Building’s Atrium in Cold Regions

Xue

Liu

2022

Sustainability

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With the development of urbanization, more and more commercial buildings are built in cities, which is resulting in a large amount of building energy consumption that threatens the ecological environment of the earth. Lighting energy in commercial buildings occupies a large proportion of consumption, and improving the quality of natural daylight in commercial atriums is of great significance for building energy efficiency as well as improving indoor comfort. This paper proposes a method for optimizing the daylight quality of commercial atriums. Starting from the perspective of parametric design, this paper investigates the current status and theoretical research on the natural daylight of commercial atriums in cold regions, taking Jinan, China, as an example. Dynamic daylight and glare simulations were performed using Rhino + Grasshopper and Ladybug + Honeybee for every design parameter in the system, followed by correlation analysis and multiple linear regression analysis using SPSS to determine the degree of influence of each design parameter on the daylight quality of the atrium. Based on the results of the above analysis, the multi-objective optimization plug-in Octopus is used to find the combination of design parameters that can achieve the best indoor daylight. The results show that among a total of fourteen atrium design parameters, seven of them are significantly correlated with atrium daylight, and after regression analysis, it is found that the atrium design parameters affect the atrium daylight and glare in the following order: Skylight VT, Skylight ratio, Atrium inclination, Fabric coverage, Fabric VT, Wall reflectivity, Roof reflectivity. The optimal design parameters for commercial atrium daylight quality are obtained according to the Pareto front solution set, which provides some reference and ideas for improving the optimization of commercial atrium daylight in cold regions of China.

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“…It must be reminded that DAYSIM does not consider many important aspects of the light analysis of real light pipes (e.g., the diffuser part). DAYSIM is a validated daylight analysis software [41][42][43][44][45][46][47] that calculates the annual availability of daylight in buildings based on RADIANCE raytracer backward, and it is able to calculate the mentioned daylight indices. The simulated case study is described in Section 3.3.…”

Section: The Simulation Softwarementioning

confidence: 99%

Modeling of Light Pipes for the Optimal Disposition in Buildings

2019

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A light pipe is an excellent solution to transport and distribute daylight into environments without or with little lighting, guaranteeing comfort inside the rooms. As stated in the literature, the evaluation of the performances of light pipes presents numerous complexities, making the work very difficult for technicians and designers. This study is aimed to present a methodology that is able to identify the potential of light pipes using indices such as daylight autonomy (DA), continuous daylight autonomy (DAc), and useful daylight illuminance (UDI). This paper presents an analysis of daylight obtained by several configurations of simple models of light pipes installed into a 5 × 5 m plant area room. All simulations are carried out in a DAYSIM environment, which allows calculating the annual availability of daylight based on a RADIANCE raytracer backward. Several daylight conditions were analyzed for different light pipe configurations, considering different pipe lengths and a variable number of light pipes. The light pipes are tested also in the horizontal position, for different orientations. The results of all the combinations were compared with the performances of a window with dimensions equal to 1/8 of the internal surface, which was in accordance with the minimum value to be guaranteed by the Italian Regulation (D.M. 5 July 1975 n. 190) for different orientations. The results indicated a difference in daylight distribution, showing a strong correlation between the percentage levels of DA and DAc with the length and number of pipes, during different periods of the year. The simulated model is strongly influenced by the aspect ratio (R = diameter/length). The results show that the illuminance levels decrease drastically, increasing the length.

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Investigation on the daylight and overall energy performance of semi-transparent photovoltaic facades in cold climatic regions of China

Cited by 52 publications

References 21 publications

Semi-Transparent Building Integrated Photovoltaic Solar Glazing: Investigations of Electrical and Optical Performances for Window Applications in Tropical Region

Semi-Transparent Building Integrated Photovoltaic Solar Glazing: Investigations of Electrical and Optical Performances for Window Applications in Tropical Region

A Study on Parametric Design Method for Optimization of Daylight in Commercial Building’s Atrium in Cold Regions

Modeling of Light Pipes for the Optimal Disposition in Buildings

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