scholarly journals Analysis of Photopic and Melanopic Lighting in Teaching Environments

Buildings ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 439
Author(s):  
Silvia Ezpeleta ◽  
Elvira Orduna-Hospital ◽  
Teresa Solana ◽  
Justiniano Aporta ◽  
Isabel Pinilla ◽  
...  
Keyword(s):  
Vertical Plane ◽  
Well Being ◽  
Led Lighting ◽  
Adequate Amount ◽  
Educational Environments ◽  
Experimental Values ◽  
Indoor Lighting

Daylight and lighting seem to be a key tool for people’s well-being, however, there are no specific and agreed recommendations that address both photopic and melanopic aspects in educational environments. The present work analyzed melanopic light in four teaching environments considering photopic indoor lighting, daylight depending on the window orientation, location of the observer in the room, and their line of view. The façade direction, daylight at 11.00 a.m. for six months from October to March, and the characteristics of each classroom, such as reflectance of the surfaces, location of the luminaires and their spectral and spatial power distributions, or calculation points affecting the melanopic light reaching the corneal vertical plane of a hypothetical control observer were studied. For this evaluation, classrooms were experimentally treated and simulated using DialuxEvo software, and the computer-generated values resembled the experimental values. Once the study was performed, an improvement proposal, based on LED lighting, was made to optimize the classroom lighting considering the melanopic requirements, which we ensured that users who passed through these classrooms had an adequate amount light at any time of the day. Our results simplify to the greatest lighting projects and enable designers to carry out optimized evaluations of specific environments from both the photometric and circadian perspectives.

CALCULATION-EXPERIMENTAL METHOD FOR DEFINITION OF LOWEST FREQUENCY IN BENDING VIBRATIONS OF COACH CAR BODY IN VERTICAL PLANE BASED ON IDENTIFICATION OF ITS BENDING STIFFNESS

2020 ◽  
Vol 2020 (9) ◽  
pp. 35-46
Author(s):  
Aleksandr Skachkov ◽  
Viktor Vasilevskiy ◽  
Aleksey Yuhnevskiy
Keyword(s):  
Least Squares Method ◽  
Vertical Plane ◽  
Bending Stiffness ◽  
Dimensional Problem ◽  
Euler Beam ◽  
Bending Vibrations ◽  
Car Body ◽  
Variable Function ◽  
Experimental Values ◽  
Definition Of

The consideration of existing methods for a modal analysis has shown a possibility for the lowest frequency definition of bending vibrations in a coach car body in a vertical plane based on an indirect method reduced to the assessment of the bending stiffness of the one-dimensional model as a Bernoulli-Euler beam with fragment-constant parameters. The assessment mentioned can be obtained by means of the comparison of model deflections (rated) and a prototype (measured experimentally upon a natural body) with the use of the least-squares method that results in the necessity of the solution of the multi-dimensional problem with the reverse coefficient. The introduction of the hypothesis on ratability of real bending stiffness of the prototype and easily calculated geometrical stiffness of a model reduces a multi-dimensional problem incorrect according to Adamar to the simplest search of the extremum of one variable function. The procedure offered for the indirect assessment of bending stiffness was checked through the solution of model problems. The values obtained are offered to use for the assessment of the lowest frequency of bending vibrations with the aid of Ritz and Grammel methods. In case of rigid poles it results in formulae for frequencies into which there are included directly the experimental values of deflections.

Development of a psychological pathway model linking lighting quality to well-being in indoor café environments

2018 ◽  
Vol 27 (3) ◽  
pp. 390-401 ◽  
Author(s):  
Dong Hyun Kim
Keyword(s):  
Structural Equation ◽  
Well Being ◽  
Pathway Model ◽  
Aesthetic Judgement ◽  
Pathway Models ◽  
Negative Feelings ◽  
Indoor Lighting ◽  
The Impact ◽  
Psychological Pathway

The aim of the study was to investigate whether indoor lighting quality would have any systematic impact on psychological well-being of people working in café environments. Earlier studies have mostly focused on the impact of lighting in typical workspace environments through laboratory settings. The present study was conducted under two different real café environments; one with daylight, another without daylight, with a total of 66 customers’ participation. Two psychological pathway models that linked customers’ self-reported lighting quality, pleasantness, aesthetic judgement of space appearance, environmental satisfaction and feelings of eye discomfort were developed. Application of structural equation modelling produced strong fits to these two models, one with daylight, another without daylight, in which quality of lighting was linked with environmental satisfaction and feelings of eye discomfort in both cafés. The results suggest that under a non-daylit café environment, providing good quality lighting can both directly and indirectly promote environmental satisfaction and decrease negative feelings of eye discomfort, while under a daylit café environment, perceived lighting quality was only indirectly linked.

The Influence of Selected Type of Daylight Device on Horizontal and Vertical Internal Illuminance

2016 ◽  
Vol 824 ◽  
pp. 707-714
Author(s):  
Lucia Maňková ◽  
Peter Hanuliak ◽  
Peter Hartman
Keyword(s):  
Biological System ◽  
Vertical Plane ◽  
Well Being ◽  
Simulation Program ◽  
Internal Environment ◽  
Theoretical Level ◽  
Basic Principles ◽  
Main Design ◽  
Artificial Lighting ◽  
Primary Stimulus

Daylighting is one of the key parameters of internal environment generation in buildings. This parameter determines creation of suitable conditions for visual activities in internal spaces and contributes to human well-being and comfort. Daylight is also the primary stimulus for synchronizing the human circadian photobiological system. Traditional parameters and criterions based explicitly on photopic vision have been critically re-evaluated and basic principles of circadian photometry have been developed in theoretical level. Nevertheless daylighting has often been neglected or left out from the main design proposals, which are usually just focused on covering basic needs for vision tasks represented barely by the illumination limits on working plane. Because the amount of light entering the eye is the most important for circadian entrainment, the illuminance recorded on a vertical plane, at eye level, is more significant for human biological system. This paper deals with the comparison of internal horizontal and vertical illuminance recorded in 3 models of room, inserted in simulation program Radiance and illuminated by three types of lighting devices, i.e. window, light-pipes and permanent supplementary artificial lighting represented by the combination of window and light-pipes. Achieved data also express the influence of a workplace position on the amount of illuminance entering the eye according to the direction of the incoming daylight from windows in side-lit room.

scholarly journals RoomFort: An Ontology-Based Comfort Management Application for Hotels

Electronics ◽  
2018 ◽  
Vol 7 (12) ◽  
pp. 345 ◽  
Author(s):  
Daniele Spoladore ◽  
Sara Arlati ◽  
Sara Carciotti ◽  
Massimiliano Nolich ◽  
Marco Sacco
Keyword(s):  
Well Being ◽  
International Markets ◽  
Semantic Web Technologies ◽  
Automatic Reasoning ◽  
Web Technologies ◽  
Hotel Room ◽  
Tourism Sector ◽  
Promising Solution ◽  
Indoor Lighting ◽  
Business Travellers

Business traveling is attracting growing attention due to the expansion of international markets. This fact calls for an increasing attention of the tourism sector toward the needs of business travellers, who often require services that are different from the ones desired by leisure tourists. The application of smart solutions coming from Context Awareness and Ambient Intelligence aimed at promoting guests’ comfort and well-being, also in cases in which they have special needs, represents a promising solution to tackle business travellers’ requirements and thus, to increase hotels attractiveness and incomes. In this context, this work introduces RoomFort, a smart comfort management system aimed at enhancing comfort of hotel room guests and leveraging on semantic representations of comfort, environment, and sensors. RoomFort provides a set of domain ontologies to formalize comfort-related metrics and to exploit the automatic reasoning capabilities provided by Semantic Web technologies, while gathering data through a network of sensors to ensure guests are provided with tailored comfort profiles during their stays in the hotel. Particular focus has been placed on visual comfort, since indoor lighting features constitute one of the main factors influencing the two main activities that most business travellers accomplish in their hotel room: working and relaxing.

Topics Important for the up-to-date Interior Lighting Professional

2020 ◽  
pp. 4-22
Author(s):  
Wout van Bommel
Keyword(s):  
New Technologies ◽  
Biological Effects ◽  
Biological Clock ◽  
Data Communication ◽  
Visible Light Communication ◽  
Well Being ◽  
Detailed Knowledge ◽  
Light Sources ◽  
Led Lighting ◽  
Interior Lighting

To avoid disappointments with LED lighting installations, detailed knowledge of the typical characteristics of the many different solid-state light sources is essential, while already long-available information on vision and colour seeing has to be combined with entirely new fundamental research on the relationship between lighting on the one hand and vision, performance, comfort, health and well-being on the other hand. Lighting has apart from visual effects also far-reaching non-visual biological effects. These effects influence the way our body “operates” and therefore, influence our health, well-being and alertness. Interior lighting installations today have to be designed so that they provide both suitable visual and non-visual biological effects, while adverse effects of lighting, like flicker, blue light hazard and disruption of the biological clock, are avoided. LEDs offer the possibility to use them not only for lighting but also for data transmission. The use of LED lighting as a means for data communication is referred to as “light beyond illumination”. Visible Light Communication (VLC), LiFi, and light itself used as sensor are part of this subject. The modern lighting professional has to get familiarised with these new technologies and applications. The author of this article published in 2019 the book “Interior Lighting, fundamentals, technology and application” with Springer [1]. It discusses in 500 pages all topics important for the up-to-date interior lighting professional. The present overview article is entirely based on this book and follows the same chapter structure. Each chapter also describes, as an example, one or two crucial aspects in more detail.

Understanding Older Adults’ Perception and Usage of Indoor Lighting in Independent Senior Living

2021 ◽  
pp. 193758672098861
Author(s):  
Daejin Kim ◽  
Carl Chang ◽  
Jennifer Margrett
Keyword(s):  
Older Adults ◽  
Successful Aging ◽  
Well Being ◽  
Vision Impairment ◽  
Retirement Community ◽  
Smart Devices ◽  
Lighting Condition ◽  
Smart Lighting ◽  
Light Levels ◽  
Indoor Lighting

The main purpose of this research is to examine the lighting condition and residents’ perception of lighting in a senior retirement community in order to understand various environmental issues related to lighting. Also, this research aims to suggest a new lighting solution to compensate for older adults’ vision impairment and challenges at home for a successful aging place. In the normal aging process, more than 30% of older adults have a vision impairment, which negatively affects health and well-being of older adults such as limited activities, falling, loneliness, depression, anxiety, and a sense of control. Via a mixed method study design, residents in senior living communities were asked to describe the adequacy of light levels and specific tasks and needs related to lighting at their home. In addition to the survey and interview, indoor lighting assessments were conducted during the in-home session. The research findings highlighted older adults’ experience and perception of lighting in their homes. Paired-sample t test indicated that there were statistically significant differences in light levels between normal conditions and full capacity conditions in all spaces. In order to address various challenges which older adults have been experiencing in their home for a long time, this research suggests new smart lighting platform which provides a proper level of illumination in older adult’s homes. Such a smart platform is proactive and can dynamically adjust the smart devices or lighting fixtures in situ, while older adults are performing certain tasks.

scholarly journals Objective and subjective evaluation of environmental noise in the Polytechnic Center Campus - UFPR

2021 ◽  
Vol 9 (71) ◽  
Author(s):  
Gabrielle Kaminski Schittini ◽  
Paulo Justiniano Ribeiro Junior ◽  
Paulo Henrique Trombetta Zannin
Keyword(s):  
Subjective Evaluation ◽  
Public Health Problem ◽  
Noise Pollution ◽  
Well Being ◽  
Environmental Noise ◽  
Control Measures ◽  
Sound Sources ◽  
Educational Environments ◽  
Measurement Results ◽  
And Performance

Noise pollution affects quality of life, well-being, and is a public health problem. In educational environments, high noise levels affect the concentration and performance of students. The Polytechnic Center Campus of UFPR is affected by several sound sources and frequented by a large number of users, which points to the need for noise management. Faced with this problem, the present study objectively and subjectively evaluates the noise in the campus. The methodology consisted of measurements that followed the standards of NBR 10151/2019 at 20 points in the region; the elaboration of maps from the insertion of parameters of relief, traffic, and characteristics of buildings and roads, calibrated according to the data collected in the measurements; and questionnaires about noise nuisance in the campus, answered by 400 users of the site. Measurement results show that the limits established at national and municipal level were not respected in a large part of the area under study. Sound maps show the surroundings of the campus delimited by dark colors that indicate high levels of noise, and internal areas demarcated by colors that represent sound pressure levels above the allowed. Interviews indicate that 60% of respondents feel annoyed by noise in the campus, and 40% consider the level of environmental noise to be reasonable. The conclusion regarding noise pollution and the influence on performance points to the need for noise control measures in the area.

scholarly journals Design and Implementation of a radio controlled led lighting system

2016 ◽  
Vol 10 (1) ◽  
pp. 29-34 ◽  
Author(s):  
Ádám Bálint ◽  
József Sárosi
Keyword(s):  
Radio Frequency ◽  
Light Emitting Diode ◽  
Lighting System ◽  
Light Emitting ◽  
Led Lighting ◽  
Led Light ◽  
Design And Implementation ◽  
Technological Advances ◽  
History Of ◽  
Indoor Lighting

Technological advances allow us to control LED (Light Emitting Diode) lighting at home, in the office it can even allow us to change the intensity of the light and this is just the beginning of what the future holds for us. In this study an LED internal lighting fixture of our own design will be presented focusing on each step in its design. Firstly, the features, types and history of LEDs will be presented, next the products available in market that are required for the completion of the device. Finally, the design and implementation as well as the radio frequency controlled LED indoor lighting fixture will be shown.

RESEARCH AND COMPUTER DESIGN LIGHTING INSTALLATIONS WITH LED LIGHTING DEVICES

2021 ◽  
pp. 39-45
Author(s):  
I. I. Bayneva ◽  
V. I. Shkarin
Keyword(s):  
Energy Efficiency ◽  
Energy Savings ◽  
Industrial Plant ◽  
Light Sources ◽  
Computer Design ◽  
Led Lighting ◽  
Fluorescent Lamps ◽  
The Face ◽  
Indoor Lighting ◽  
Led Lights

The article discusses the main issues of energy conservation in lighting in the face of a growing shortage of energy resources. Estimated reserves of energy savings in lighting. The urgent tasks of designing modern lighting make it possible to identify the most efficient light sources and lighting devices, ways to ensure energy and lighting savings, and ways to increase the energy efficiency of an industrial plant lighting system. The basic provisions for the use of LED lighting devices for lighting industrial premises are given. The requirements for artificial production lighting, regulated by various regulatory documents, are considered. The possibilities of DiaLux program for lighting modeling are analyzed. Lighting projects have been developed for various sections of the galvanic shop with LED lights in DIALux. A comparative analysis of the energy efficiency of indoor lighting projects using LED and fluorescent lamps demonstrates the obvious use of LED lighting devices for lighting industrial premises.

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