scholarly journals Principles of the exposure natural lighting modeling of premises

2020 ◽  
Vol 2020 (2) ◽  
pp. 113-118
Author(s):  
Volodymyr Yehorchenkov ◽  
◽  
Oleh Sergeychuk ◽  
Lidiia Koval ◽  
◽  
...  
Keyword(s):  
Energy Consumption ◽  
Software Package ◽  
Average Energy ◽  
North West ◽  
Natural Lighting ◽  
The North ◽  
Natural Exposure ◽  
Average Energy Consumption ◽  
The One ◽  
Office Rooms

It’s well known that a criterion of estimating the varying natural lighting is exposure equal to the product of light intensity by its duration. Here we have made studies into the exposure in the room depending on the orientation of a light aperture and its location in space. The exposure has been considered by the example of three identical office rooms with the same light apertures oriented north, west and south and having three positions – vertical, inclined and horizontal. To calculate the annual exposure we made use of the well-known software package VELUX Daylight Visualizer 2. For convenience of analyzing the exposure there was introduced the concept of the natural exposure coefficient (NEC) which is a ratio between the exposure in the room and a simultaneous value of the outer exposure. Our studies have shown that exposure is an effective criterion to assess the indoor natural lighting in time. The existing system of estimating energy consumption in lighting buildings with the help of a simultaneous lighting is rough and does not take into account such factors as orientation of light apertures by the sides of the horizon and their location in space. The use of exposure let us improve the method of calculating energy consumption in lighting premises taking into account the light aperture location in space and their as orientation by the sides of the horizon. The numerical experiment performed has given a predicted result, namely, the most power-consuming room is the north-oriented one with the vertical light aperture and the least power-consuming room is the one with the horizontal light aperture. The room with the inclined light aperture has average energy consumption.

scholarly journals Minimizing Energy and Computation in Long-Running Software

2021 ◽  
Vol 11 (3) ◽  
pp. 1169
Author(s):  
Erol Gelenbe ◽  
Miltiadis Siavvas
Keyword(s):  
Energy Consumption ◽  
Execution Time ◽  
High Performance ◽  
Average Energy ◽  
Computation Time ◽  
Hardware Failures ◽  
Average Energy Consumption ◽  
The One ◽  
Hardware Platforms ◽  
Time And Energy

Long-running software may operate on hardware platforms with limited energy resources such as batteries or photovoltaic, or on high-performance platforms that consume a large amount of energy. Since such systems may be subject to hardware failures, checkpointing is often used to assure the reliability of the application. Since checkpointing introduces additional computation time and energy consumption, we study how checkpoint intervals need to be selected so as to minimize a cost function that includes the execution time and the energy. Expressions for both the program’s energy consumption and execution time are derived as a function of the failure probability per instruction. A first principle based analysis yields the checkpoint interval that minimizes a linear combination of the average energy consumption and execution time of the program, in terms of the classical “Lambert function”. The sensitivity of the checkpoint to the importance attributed to energy consumption is also derived. The results are illustrated with numerical examples regarding programs of various lengths and showing the relation between the checkpoint interval that minimizes energy consumption and execution time, and the one that minimizes a weighted sum of the two. In addition, our results are applied to a popular software benchmark, and posted on a publicly accessible web site, together with the optimization software that we have developed.

scholarly journals Technical and economic analysis of replacing artificial lighting system to induction of photoperiod effect in begonia's seedlings in greenhouse

2012 ◽  
Vol 32 (4) ◽  
pp. 663-668 ◽  
Author(s):  
Eduardo David ◽  
Luiz Antonio Rossi ◽  
Odail Pagliardi
Keyword(s):  
Energy Consumption ◽  
Average Energy ◽  
Electrical Energy ◽  
Economic Feasibility ◽  
Artificial Lighting ◽  
Filament Lamp ◽  
Discharge Lamp ◽  
Average Energy Consumption ◽  
The One ◽  
Incandescent Lamps

The type of artificial light used for inducing photoperiod effect in begonia's seedlings at greenhouse has fundamental importance in the growth and development of these plants and directly reflects in the electrical energy consumption used in this production process. The objective of this research was to analyze the technical and economic feasibility of replacing the current technology of artificial lighting used by the producers (incandescent lamps), by the technology of discharge lamps with the purpose of inducing photoperiod in a greenhouse. The analysis results indicate that the discharge lamp of 32 W Tubular Fluorescent discharge lamp was the one that presented the lower peak demand and lower average energy consumption of 85.01% compared to incandescent filament lamp of 100 W that is the technology of bigger consumption and currently used by the producer.

Control of a Hybrid Illumination System in a Tropical Zone

2014 ◽  
Vol 704 ◽  
pp. 368-372 ◽  
Author(s):  
German Alfonso Osma Pinto ◽  
Gabriel Ordóñez Plata ◽  
Laura Yazmin Amado Duarte ◽  
Rodolfo Villamizar Mejía
Keyword(s):  
Control System ◽  
Energy Consumption ◽  
Data Analysis ◽  
System Approach ◽  
Average Energy ◽  
Tropical Zone ◽  
Natural Lighting ◽  
Illumination System ◽  
Reduction Of Energy Consumption ◽  
Average Energy Consumption

This paper presents a control system approach for hybrid illumination of administrative offices (225m2) at an university building located at a tropical zone. The main goal was to minimize the energy consumption of artificial lightings (fluorescent), by taking advantage of the high natural lighting level during a workday (8 a.m. and 6 p.m.). The control system devices used for each office are: presence sensor, dimming photocell and dimming ballasts, all them connected to the Andover Infinet Controller. By means of data analysis and daylight curves, energy consumption and financial savings are determined. Subsequently, the average energy consumption per square meter due to the hybrid lighting in the offices (8.5 kWh/m2/year) and typical illumination of the central campus (27 kWh/m2/year) were compared. It was demonstrated that a reduction of energy consumption of about 70%, 50% by daylighting and 20% by automation was obtained.

scholarly journals Modifying Building Energy-Saving Design Based on Field Research into Climate Features and Local Residents’ Habits

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 442
Author(s):  
Xiaoyue Zhu ◽  
Bo Gao ◽  
Xudong Yang ◽  
Zhong Yu ◽  
Ji Ni
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Residential Buildings ◽  
Average Energy ◽  
Field Tests ◽  
Building Energy ◽  
Building Energy Efficiency ◽  
Local Conditions ◽  
Building Energy Saving ◽  
Average Energy Consumption

In China, a surging urbanization highlights the significance of building energy conservation. However, most building energy-saving schemes are designed solely in compliance with prescriptive codes and lack consideration of the local situations, resulting in an unsatisfactory effect and a waste of funds. Moreover, the actual effect of the design has yet to be thoroughly verified through field tests. In this study, a method of modifying conventional building energy-saving design based on research into the local climate and residents’ living habits was proposed, and residential buildings in Panzhihua, China were selected for trial. Further, the modification scheme was implemented in an actual project with its effect verified by field tests. Research grasps the precise climate features of Panzhihua, which was previously not provided, and concludes that Panzhihua is a hot summer and warm winter zone. Accordingly, the original internal insulation was canceled, and the shading performance of the windows was strengthened instead. Test results suggest that the consequent change of SET* does not exceed 0.5 °C, whereas variations in the energy consumption depend on the room orientation. For rooms receiving less solar radiation, the average energy consumption increased by approximately 20%, whereas for rooms with a severe western exposure, the average energy consumption decreased by approximately 11%. On the other hand, the cost savings of removing the insulation layer are estimated at 177 million RMB (1 USD ≈ 6.5 RMB) per year. In conclusion, the research-based modification method proposed in this study can be an effective tool for improving building energy efficiency adapted to local conditions.

Ugliness and Beauty: the Politics of Landscape in Walter Greenwood's Love on the Dole

2013 ◽  
Vol 29 (1) ◽  
pp. 35-47
Author(s):  
Claire Warden
Keyword(s):  
Twentieth Century ◽  
Working Class ◽  
The Other ◽  
Surrounding Area ◽  
North West ◽  
Avant Garde ◽  
The North ◽  
The One ◽  
The University ◽  
Open Fields

The multi-spatial landscape of the North-West of England (Manchester–Salford and the surrounding area) provides the setting for Walter Greenwood's 1934 play Love on the Dole. Both the urban industrialized cityscape and the rural countryside that surrounds it are vital framing devices for the narrative – these spaces not simply acting as backdrops but taking on character roles. In this article Claire Warden reads the play's presentation of the North through the concept of landscape theatre, on the one hand, and Raymond Williams's city–country dialogism on the other, claiming that Love on the Dole is imbued with the revolutionary possibility that defines the very landscape in which it is set. From claustrophobic working-class kitchen to the open fields of Derbyshire, Love on the Dole has a sense of spatial ambition in which Greenwood regards all landscapes as tainted by the industrial world while maintaining their capacity to function independently. Ugliness and beauty, capitalist hegemony and socialistic hopefulness reside simultaneously in this important under-researched example of twentieth-century British theatre, thereby reflecting the ambivalent, shifting landscape of the North and producing a play that cannot be easily defined artistically or politically. Claire Warden is a Lecturer in Drama at the University of Lincoln. Her work focuses on peripheral British performances in the early to mid-twentieth century. She is the author of British Avant-Garde Theatre (Palgrave MacMillan, 2012) and is currently writing Modernist and Avant-Garde Performance: an Introduction for Edinburgh University Press, to be published in 2014.

scholarly journals KAZAKHSTAN-CHINA UNDER THE INITIATIVE «ONE BELT - ONE ROAD» RELATIONSHIPS AND CONFLICT ISSUES AND SOLUTIONS

2020 ◽  
Vol 66 (3) ◽  
Author(s):  
K. Darkenov ◽  
◽  
K. Kakar ◽  
Keyword(s):  
Central Asia ◽  
Mineral Resources ◽  
North West ◽  
Economic Relations ◽  
The North ◽  
Eurasian Continent ◽  
One Belt One Road ◽  
Strategic Position ◽  
The One ◽  
The Silk Road

Central Asia is the heart of the Eurasian continent, a region directly adjacent to China, and the Silk Road, which connects the Eurasian continent, passes through this region. Kazakhstan is a country rich in natural resources and energy in Central Asia. Apart from the mineral resources of Central Asia, its location as the center of two continents, its importance in China's foreign trade and its strategic position in the defense of the North-West Frontier, made Kazakhstan known to the world about the location of this project. Since 2014, China has focused on the "One Belt - One Road" strategy in the region. Since 2014, economic relations between the two countries have developed under the "One Belt - One Road" initiative, but the problems remain. The article is devoted to the analysis of economic relations between the two countries and give some suggestions to solve the problem

scholarly journals Energy-Efficient and Disjoint Multipath Using Face routing in Wireless Sensor Networks

Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7823
Author(s):  
Hyunchong Cho ◽  
Seungmin Oh ◽  
Yongje Shin ◽  
Euisin Lee
Keyword(s):  
Energy Consumption ◽  
Average Energy ◽  
Packet Transmission ◽  
Destination Node ◽  
Path Generation ◽  
Data Packets ◽  
Hole Area ◽  
Face Routing ◽  
Multiple Routes ◽  
Average Energy Consumption

In WSNs, multipath is well-known as a method to improve the reliability of packet delivery by making multiple routes from a source node to a destination node. To improve reliability and load-balancing, it is important to ensure that disjoint characteristics of multipath do not use same nodes during path generation. However, when multipath studies encounter a hole area from which is hard to transmit data packets, they have a problem with breaking the disjoint features of multipath. Although existing studies propose various strategies to bypass hole areas, they have side effects that significantly accelerate energy consumption and packet transmission delay. Therefore, to retain the disjoint feature of multipath, we propose a new scheme that can reduce delay and energy consumption for a node near a hole area using two approaches—global joint avoidance and local avoidance. This scheme uses global joint avoidance to generate a new path centered on a hole area and effectively bypasses the hole area. This scheme also uses local joint avoidance that does not select the same nodes during new path generation using a marking process. In simulations, the proposed scheme has an average 30% improvement in terms of average energy consumption and delay time compared to other studies.

scholarly journals Food security of paddy farm households based on the proportion of food expenditure and energy consumption level in Jogorogo Ngawi

2021 ◽  
Vol 905 (1) ◽  
pp. 012077
Author(s):  
A D P M Larasati ◽  
Darsono ◽  
S Marwanti
Keyword(s):  
Food Security ◽  
Energy Consumption ◽  
Sample Selection ◽  
Average Energy ◽  
Farm Households ◽  
Household Food Security ◽  
Protein Consumption ◽  
Consumption Level ◽  
Food Expenditure ◽  
Average Energy Consumption

Abstract Ngawi is the sixth paddy producer in Indonesia and certainly has an influence on the food security of paddy farm households. This study aimed to analyze the proportion of food expenditure (PFE), energy and protein consumption, the relationship between food expenditure and energy consumption, and the condition of food security. The basic method used descriptive analytic. The number of respondents based on the slovin formula was 87 households. The sample selection used stratified random sampling. The data analysis method used correlation with SPSS 22 and cross indicator between PFE and energy consumption level. The results showed that the average of PFE was 58.81%. The average energy consumption was 4,272.2 kcal/household/day with an energy consumption level of 81.93% while the average protein consumption was 122.1 grams/household/day lower than the average household RDA consumption. Food expenditure had a significant relationship to energy consumption with a correlation coefficient of 0.925 including a very strong and unidirectional relationship. The contribution of household food security conditions were 28.7% secure; 32.2% vulnerable; 10.3% less secure; 28.8% insecure.

Effect of Smart Glazing Window on Energy Consumption inside Office Building

2020 ◽  
Vol 1008 ◽  
pp. 72-83
Author(s):  
Asmaa Mohammed Nageib ◽  
Abbas Mohamed El-Zafarany ◽  
Fatma Osman Mohamed ◽  
Mohamed Helmy El-Hefnawy
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Solar Radiation ◽  
Climatic Conditions ◽  
Office Buildings ◽  
Smart Windows ◽  
Upper Egypt ◽  
Natural Lighting ◽  
North East ◽  
Office Rooms

The office buildings in Egypt, especially in Upper Egypt, reflect serious problems in achieving for energy efficiency as a result of increasing the use of mechanical refrigeration devices in office rooms, due to solar radiation and rising summer temperatures in recent years. Smart windows can play an important role in reducing significantly the energy consumption and maintaining energy inside buildings, also helps to control incoming solar radiation in order to minimize solar gain, especially in summer as well as ensuring the best natural lighting conditions without glare inside a room. This paper aims to evaluate the most efficient daylight and thermal performance of various types of the smart glazing and its impact on the energy consumption in the climatic conditions of one of the office buildings (Diwan governorate) in Sohag governorate as one of Upper Egypt governorates, with determining the best smart glass types for efficient use of energy. The paper follows the theoretical, applied, by studying types of smart glazing and their relation to achieving the energy efficiency. Then using (Energy Plus) simulation tool, which has been used in utilizing its modeling orientation (Design Builder) to study using types of smart glazing on the model of an office room in Building of Diwan governorate of Sohag in the four different orientations (North, East, South and West), when window-to-floor ratios (WFRs) (8%, 16%, 24% and 32%). The paper ends with a presentation of the most important results, recommendations and determination the best types of smart glass that provides energy, daylight without glare and providing greater comfort to users.

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