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DOI: 10.15507/2658-4123.031.202103.470-486


Assessment of Lighting Uniformity as a Factor of Energy Efficiency in Greenhouse Horticulture


Sergey A. Rakutko
Chief Researcher, Head of the Laboratory of Energy Ecology of Light Culture, Institute for Engineering and Environmental Problems in Agricultural Production ‒ Branch of Federal Scientific Agroengineering Center VIM (3 Filtrovskoye Shosse, Saint Petersburg 196625, Russian Federation), D.Sc. (Engr.), Associate Professor, Researcher ID: B-2745-2014, ORCID: https://orcid.org/0000-0002-2454-4534, Scopus ID: 26040971100, This email address is being protected from spambots. You need JavaScript enabled to view it.

Elena N. Rakutko
Researcher, Institute for Engineering and Environmental Problems in Agricultural Production ‒ Branch of Federal Scientific Agroengineering Center VIM (3 Filtrovskoye Shosse, Saint Petersburg 196625, Russian Federation), Researcher ID: AAW-6856-2021, ORCID: https://orcid.org/0000-0002-3536-9639, This email address is being protected from spambots. You need JavaScript enabled to view it.

Introduction. Greenhouse lighting systems are an integral part of the system for growing plants in cultivation facilities with an artificial microclimate. The uniformity of light distribution over the growing area is important to increase energy efficiency and improve plant quality, among other requirements. The aim of the work is to consider the mathematical apparatus for describing the distribution of light over the surface and to justify the choice of ways to characterize the degree of lighting uniformity.
Materials and Methods. The basic concepts of the subject area such as lighting, lighting body, horizontal lighting curve, luminous intensity curve are considered in terms of theoretical photometry. To assess the energy and ecological friendliness of the greenhouse horticulture, the lighting efficiency factor was used. Various methods for determining the average lighting value are presented. The formulas for the uniformity coefficients are presented. Experimental verification was carried out on a horizontal plane simulating a surface for growing plants. A luminary with a round-symmetric light distribution was used.
Results. It has been found that the lighting values calculated by the proposed method at various points of the illuminated surface correspond to the experimentally obtained values. It has been shown that the coefficient taking into account the pattern of lighting distribution over all points of the surface carries a lot of information about the uniformity. A frequency graph for the lighting distribution value has been constructed and its practical applicability has been substantiated. The relationship between the lighting efficiency and uniformity of the generated lighting has been revealed. With reduced suspension height of the luminary, it is possible to increase significantly the lighting efficiency factor, however, the lighting uniformity deteriorates sharply.
Discussion and Conclusion. There is proposed a method for assessing the energy efficiency by the lighting efficiency factor, which determines the proportion of the useful lighting falling on the surface in the total lighting generated by light sources. It is suggested that this indicator can characterize the ecological quality of photoculture, since it has been established its relationship with the uniformity of the created lighting, the impact of which on photoculture is described in the literature.

Keywords: greenhouse horticulture, lighting installation, lighting uniformity, flux efficiency, energy efficiency, ecology friendliness

Conflict of interest: The authors declare no conflict of interest.

For citation: Rakutko S.A., Rakutko E.N. Assessment of Lighting Uniformity as a Factor of Energy Efficiency in Greenhouse Horticulture. Inzhenernyye tekhnologii i sistemy = Engineering Technologies and Systems. 2021; 31(3):470-486. DOI: https://doi.org/10.15507/2658-4123.031.202103.470-486

Contribution of the authors:
S. A. Rakutko – scientific guidance, formulation of the basic research concept and structure of the article, writing the initial version of the article.
E. N. Rakutko – analysis of scientific sources, mathematical modeling, article writing.

All authors have read and approved the final manuscript.

Received 12.04.2021; approved after reviewing 14.05.2021;
accepted for publication 21.05.2021



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