Monthly luminous efficacy models and illuminance prediction using ground measured and satellite data

Fabian, Miroslav; Uetani, Yoshiaki; Darula, Stanislav

doi:10.1016/j.solener.2017.12.056

Cited by 12 publications

(5 citation statements)

References 26 publications

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“…Global and diffuse luminous efficacies are rather independent from solar altitude while values of diffuse luminous efficacy are higher than values of global luminous ones [1,2]. The luminous efficacy is often derived from three basic parameter groups [3]:…”

Section: Methodsmentioning

confidence: 99%

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Potential daylight resources between tropical and temperate cities – a case study of Ho Chi Minh City and Moscow

Thi

Solovyov

2018

MATEC Web Conf.

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Abstract.Horizontal illuminance is an important indicator, which shows the resources of the light climate of each region. Meticulous consideration of the light-climate data allows us to develop graphs of diffuse and global illuminance (ED and EG) and go to the territorial norms of daylight spaces at the modern level. Measurements of horizontal illuminance in Vietnam are not available; therefore, the calculation of the determination horizontal illuminance from solar radiation by light equivalents using the values of the luminous efficacy is widely used now. The paper contains calculation of the luminous efficacy for Vietnam, the results are graphs of horizontal illuminance for Ho Chi Minh. Comparative analysis with horizontal natural illuminance of Moscow shows a high level and uniform distribution of outdoor illuminance in the tropical sky in Vietnam. The maximum values of ED and EG for Ho Chi Minh City are 42.01 Klux and 87.17 Klux; for Moscow these values are equal to 28.3 Klux and 53.1 Klux, respectively. In addition, the levels of illuminance in the winter months in Ho Chi Minh are much higher than in Moscow, which is explained by the latitudinal difference in the location of these cities and the corresponding movement of the Sun.

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Section: Methodsmentioning

confidence: 99%

“…The third group (mean diffuse luminous efficacy): based on the database of measured diffuse horizontal irradiance (QD) and illuminance (ED) levels, a local constant values KD for the diffuse luminous efficacy was derived as follows [3,4]. Similarly, the local constant value of the total light efficiency KG is determined by the formula:…”

Section: Methodsmentioning

confidence: 99%

Potential daylight resources between tropical and temperate cities – a case study of Ho Chi Minh City and Moscow

Thi

Solovyov

2018

MATEC Web Conf.

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“…Since illuminance measuring stations are sparse (Janjai et al, 2014), the luminous efficacy model gives the advantage of deriving daylight from the widely measured solar irradiance data (Souza and Robledo, 2004). Aside from being sparse, illuminance measuring stations can be expensive to set up, thus making the luminous efficacy model a better alternative (Fabian et al, 2018). Nonetheless, the critical issue in using the luminous efficacy model lies in the quality of the solar radiation data.…”

Section: Review On Energy Efficiency Daylight Illuminance and Luminou...mentioning

confidence: 99%

“…, 2014), the luminous efficacy model gives the advantage of deriving daylight from the widely measured solar irradiance data (Souza and Robledo, 2004). Aside from being sparse, illuminance measuring stations can be expensive to set up, thus making the luminous efficacy model a better alternative (Fabian et al. , 2018).…”

Section: Review On Energy Efficiency Daylight Illuminance and Luminou...mentioning

confidence: 99%

Application of luminous efficacies for daylight illuminance data generation in subtropical Hong Kong

Aghimien

2022

SASBE

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PurposeDaylight plays a crucial role in the attainment of building energy savings. Harnessing daylight in building designs will require the need for daylight illuminance data. However, daylight illuminance data are scarce due to few measuring stations. Aside from being sparse, illuminance measuring stations can be expensive to set up, thus making the luminous efficacy model a better alternative. Hence, this study attempted to model horizontal luminous efficacies under the 15 Commission internationale de l'éclairage (CIE) standard skies. Therefrom, daylight illuminance was estimated from a proposed vertical luminous efficacy model.Design/methodology/approachMeasured solar irradiance, daylight illuminance and luminance distribution data were gathered from the local measuring station in Hong Kong. The luminance distribution data were used to classify the skies into the 15 CIE standard skies. Next, the solar irradiance and daylight data were used to derive the horizontal luminous efficacies under each standard sky. Furthermore, a vertical luminous efficacy model developed using the measured data was described, and this was used to predict vertical illuminance.FindingsIt was observed that Skies 1, 8 and 13 seem to be predominant in Hong Kong. Also, the result showed that constant luminous efficacies could be used for deriving illuminance data. Furthermore, horizontal luminous efficacy ranged from 40 to 190lm/W, indicating that daylight can provide sufficient visibility during working hours. The vertical luminous efficacy model proves to offer reasonable estimations of vertical illuminance data.Research limitations/implicationsFurther work needs to be done with more measured data to cover for spring seasons. The described model still needs to be fitted with different world climates to ascertain its universal applicability. The evaluations need to be done under obstructed sky conditions to cater for dense and clustered urban centres.Practical implicationsThe discussed luminous efficacy model could be used to derive illuminance data in the absence of measured daylight illuminance data, especially in the subtropical region. Also, the comparative advantage of daylight over artificial lighting was highlighted in this study.Originality/valueUnlike previous studies, this paper discusses the luminous efficacies of global, direct and diffuse components under the 15 CIE standard skies. Furthermore, the described luminous efficacy analysis provides an approach for deriving vertical and horizontal illuminance data. Such vertical data will be required for analysing building lighting requirements, sensible heat from electric lighting, and energy savings from daylighting controls. Also, the information on horizontal luminous efficacies will help evaluate solar roof and skylight designs.

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“…Introduction Maximization of natural lighting coupled with sustainable and ecological development for the reduction of energy consumption are now essential building design strategies [1]. Bearing these aims in mind, artificial light should be used to complement daylight, in order to maintain rather than increase energy demand [2]. When considering the design of energy efficient buildings, which rely on daylight, and efficient sizing of both cooling and heating systems, quantitative information is necessary on the levels of illumination and solar irradiance received on surfaces with different inclinations.…”

Section: Nomenclaturementioning

confidence: 99%

A new diffuse luminous efficacy model for daylight availability in Burgos, Spain

et al. 2020

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Monthly luminous efficacy models and illuminance prediction using ground measured and satellite data

Cited by 12 publications

References 26 publications

Potential daylight resources between tropical and temperate cities – a case study of Ho Chi Minh City and Moscow

Potential daylight resources between tropical and temperate cities – a case study of Ho Chi Minh City and Moscow

Application of luminous efficacies for daylight illuminance data generation in subtropical Hong Kong

A new diffuse luminous efficacy model for daylight availability in Burgos, Spain

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