scholarly journals Visual comfort considered light control methods for energy efficient office buildings: A case study

2018 ◽  
Vol 22 (Suppl. 3) ◽  
pp. 875-885
Author(s):  
Woonsik Lee ◽  
Kwanwoo Song ◽  
Hyejung Cho
Keyword(s):  
Energy Saving ◽  
Energy Efficient ◽  
Energy Savings ◽  
Comfort Level ◽  
Control Methods ◽  
Visual Comfort ◽  
Light Control ◽  
Open Plan ◽  
Energy Saving Technology

This paper presents and investigates the performance of light control methods for energy savings with optimal visual comfort in open-plan office. By grouping personal light zone and tracking user?s location, we can provide an energy efficient light control in the office. Simulation and pilot testing results show that more than 60% energy savings could be achieved while providing recommended visual comfort level for each user. Since the proposed methods provide unprecedented energy savings, it can be said that this is a remarkable energy saving technology in the field of light control.

scholarly journals CASE STUDY OF ENERGY CONSERVATION IN INDUSTRY BY APPLICATION OF LEAN TOOLS

2021 ◽  
Vol 5 (12) ◽  
Author(s):  
N.Sujith Prasanna ◽  
Dr.J.Nagesh Kumar
Keyword(s):  
Energy Conservation ◽  
Energy Saving ◽  
Energy Cost ◽  
Energy Use ◽  
Energy Savings ◽  
Sustainable Manufacturing ◽  
Integrated Approach ◽  
Energy Saving Potential ◽  
Lean Tools

Energy cost is significant in many of the manufacturing activities. The efficiency of energy use is quiet low as there are substantial visible and hidden losses. Visible losses can be easily identified and corrective action can be taken. However hidden and indirect losses form a sizeable portion of the losses. Identifying these losses is not easy and requires an integrated approach which includes thorough study of process, operations and their interactions with energy use. Industries across sectors have implemented lean management principles which target various wastes occurring in the plant. This paper discusses case studies which highlight the exploitation of lean tools as a means for unearthing hidden energy saving potential that often go unnoticed. In addition to the energy savings which results in improved profits and competitiveness, the approach also aids the industry to pursue a path of sustainable manufacturing.

Application of Green Lighting Technology in Highway Service – A Case Study of Mt. Lushan West Sea Tourism Highway Service

2014 ◽  
Vol 548-549 ◽  
pp. 1815-1819 ◽  
Author(s):  
Xiao Chun Qin ◽  
She Gang Shao ◽  
Yi Shen
Keyword(s):  
Energy Efficiency ◽  
Energy Efficient ◽  
Energy Savings ◽  
Light Guide ◽  
Operating Costs ◽  
Natural Light ◽  
Lighting Technology ◽  
Lighting Systems ◽  
Service Application

Green lighting technology has the advantages of energy efficiency, friendly environment, safety and comfort. Based on the introduction of green lighting technology, taken the Mt. Lushan West Sea tourist highway service as the case study, we analyzed light guide illumination, the optimum use of natural light and energy efficient lighting respectively from the aspects of technical characteristics and the specific highway service application. We finally made the economic analysis in the energy savings of green lights in the highway service, and the result showed that through the use of green lighting systems Mt. Lushan West Sea tourist highway service could save electricity and reduce operating costs 134,700 Yuan per year.

scholarly journals The Comfort Map—A Possible Tool for Increasing Personal Comfort in Office Workplaces

Buildings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 233
Author(s):  
Ágnes Borsos ◽  
Erzsébet Szeréna Zoltán ◽  
Éva Pozsgai ◽  
Balázs Cakó ◽  
Gabriella Medvegy ◽  
...  
Keyword(s):  
Thermal Comfort ◽  
Environmental Quality ◽  
Considerable Effect ◽  
Comfort Level ◽  
Office Building ◽  
Indoor Environmental Quality ◽  
Visual Comfort ◽  
Acoustic Comfort ◽  
Open Plan ◽  
Office Employees

Previous studies have shown that indoor environmental quality (IEQ) parameters may have a considerable effect on office employees’ comfort, health and performance. Therefore, we initiated a research program to help occupants identify IEQ parameters they perceive as risk factors for their health in an office and enhance their comfort levels in an office environment. Since we assumed that office employees might have different indoor environmental quality expectations related to their work area and that these differences could be measured, our objective was to develop an office ‘comfort map’ based on occupants’ individual IEQ preferences. Thus, the goal of the comfort map would be to help tailor office spaces to their occupants’ health and comfort expectations. The comfort survey was developed to assess the comfort-related opinions of the occupants, based on IEQ parameters (visual comfort, acoustic comfort, air quality and thermal comfort) of a chosen open-plan office building. The survey also assessed the degree to which the given IEQ parameter was considered a health risk factor by occupants or caused a negative comfort sensation for them. The survey was filled in by 216 occupants. The answers were then analyzed with the help of a frequency table depicting relative frequency. The measurements of IEQ parameters took place in an open-plan office in the chosen office building (a Hungarian subsidiary’s office building belonging to an international company in Budapest). The occupants had different opinions regarding the perceived effects of the IEQ parameters on their health and comfort. Almost two-thirds of the respondents (64.8%) were dissatisfied with the adjustability of the noises and sounds IEQ parameter at their workstation. Furthermore, half of the respondents (50.1%) were dissatisfied with the adjustability of ventilation. Most of the occupants (45.8%) considered noises and sounds as the IEQ parameter that had a negative effect on their health. There were also IEQ differences between different areas of the office space. Based on these results, a comfort map was developed for the office. The comfort map contains information about the IEQ characteristics of each workstation by depicting the thermal comfort, carbon dioxide, visual comfort and acoustic comfort characteristics of a given workstation on a relative scale. Based on the thermal, air, acoustic, and lighting differences between the workstations, occupants can select their preferred workstations when a desk-sharing system works. Although still in its pilot phase, the comfort map could increase the chances for office employees to find the workstation best suited to their IEQ expectations. This could improve occupants’ overall comfort level, which could in turn enhance occupants’ productivity and mental as well as physical health.

The potential of simplified concepts for daylight harvesting

2005 ◽  
Vol 37 (1) ◽  
pp. 21-38 ◽  
Author(s):  
RP Leslie ◽  
R Raghavan ◽  
O Howlett ◽  
C Eaton
Keyword(s):  
New York ◽  
Energy Consumption ◽  
Potential Energy ◽  
Energy Saving ◽  
Solar Irradiance ◽  
Energy Savings ◽  
Climatic Regions ◽  
Switching Behaviour ◽  
Open Plan ◽  
Daylight Harvesting

Daylighting systems offer tremendous potential for reducing the energy consumption of electric lighting, but their usage has been inhibited by high costs and imperfect performance of current technologies. This paper presents predictions of energy savings for two proposed daylighting technologies, a daylight-sensing switch and an automatic blinds system, which employ simple, inexpensive components and designs. Assumptions of solar irradiance, blind position, blind operation behaviour, and light switching behaviour were combined with illuminance data and daylight factors to develop an algorithm for calculating the potential energy usages of six different systems in commercial private offices and open plan offices. Results show that the combined usage of the proposed technologies perform with an average annual energy saving of 24% compared with manual switching and blinds operation in Albany, New York. Compared with a photosensor-operated dimming system, the proposed technologies combined show better performance during summer months. Comparisons were also made for the systems in six US climatic regions.

scholarly journals EVALUATION OF ENERGY-EFFICIENT RETROFIT POTENTIAL FOR GOVERNMENT OFFICES IN INDIA

2021 ◽  
Vol 6 (2) ◽  
pp. 03-17
Author(s):  
Gazal Dandia ◽  
◽  
Pratheek Sudhakaran ◽  
Chaitali Basu ◽  
◽  
...  
Keyword(s):  
Energy Consumption ◽  
Total Energy ◽  
Energy Efficient ◽  
Energy Demand ◽  
Energy Savings ◽  
High Energy ◽  
Payback Period ◽  
Total Energy Consumption ◽  
The Cost

Introduction: High energy consumption by buildings is a great threat to the environment and one of the major causes of climate change. With a population of 1.4 billion people and one of the fastest-growing economies in the world, India is extremely vital for the future of global energy markets. The energy demand for construction activities continues to rise and it is responsible for over one-third of global final energy consumption. Currently, buildings in India account for 35% of total energy consumption and the value is growing by 8% annually. Around 11% of total energy consumption are attributed to the commercial sector. Energy-efficient retrofitting of the built environments created in recent decades is a pressing urban challenge. Presently, most energy-efficient retrofit projects focus mainly on the engineering aspects. In this paper, we evaluate various retrofitting options, such as passive architectural interventions, active technological interventions, or a combination of both, to create the optimum result for the selected building. Methods: Based on a literature study and case examples, we identified various energy-efficient retrofit measures, and then examined and evaluated those as applied to the case study of Awas Bhawan (Rajasthan Housing Board Headquarters), Jaipur, India. For the evaluation, we developed a simulation model using EQuest for each energy measure and calculated the resultant energy savings. Then, based on the cost of implementation and the cost of energy saved, we calculated the payback period. Finally, an optimum retrofit solution was formulated with account for the payback period and ease of installation. Results and discussion: The detailed analysis of various energy-efficient retrofit measures as applied to the case study indicates that the most feasible options for retrofit resulting in optimum energy savings with short payback periods include passive architecture measures and equipment upgrades.

scholarly journals Optimization of insulation levels from an environmental perspective: impact of HVAC controls and Personal Comfort Systems

2021 ◽  
Vol 2069 (1) ◽  
pp. 012076
Author(s):  
L Landuyt ◽  
S Lauwerys ◽  
S De Turck ◽  
M Steeman ◽  
N Van Den Bossche
Keyword(s):  
Energy Efficient ◽  
Indoor Environment ◽  
Energy Savings ◽  
Inverse Correlation ◽  
Iterative Design ◽  
Operational Energy ◽  
Insulation Thickness ◽  
Energy Simulations ◽  
Student Team

Abstract Today, strict insulation requirements apply. Nevertheless, the inverse correlation of thermal conductivity with insulation thickness leads to decreasing energy savings with increasing insulation packages. Therefore, a balance between potential energy savings and environmental impact due to additional materials using Life Cycle Assessment (LCA) needs to be strived for. This balance is sought for a case study called ‘The Mobble’ i.e. a flexible, modular, and circular building system developed by a student team from Ghent University. Through an iterative design process supported by LCA, comfort and dynamic energy simulations efforts are made to design an energy-efficient and low impact module with an agreeable indoor environment. First, material choices are made based on LCA and the material impact of a 5-module home is calculated. Second, energy calculations are executed in Modelica/Dymola. For this, three possible energy reductions are explored: insulating the building, altering the working regime of the HVAC system and lowering the setpoint temperature while maintaining comfort by using personal comfort systems (PCS). The results support PCS as a possible energy conservation measure and indicate that reducing operational energy does not shift the environmental burden to the additional materials’ production. However, these environmental saving effects decrease as the operational share decreases.

scholarly journals Boundary Identification for Traction Energy Conservation Capability of Urban Rail Timetables: A Case Study of the Beijing Batong Line

Energies ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 2111
Author(s):  
Jiang Liu ◽  
Tian-tian Li ◽  
Bai-gen Cai ◽  
Jiao Zhang
Keyword(s):  
Energy Conservation ◽  
Energy Saving ◽  
Energy Efficient ◽  
Bacterial Foraging Optimization ◽  
Control Approach ◽  
Boundary Identification ◽  
Train Operation ◽  
Passenger Volume ◽  
The Cost

Energy conservation is attracting more attention to achieve a reduced lifecycle system cost level while enabling environmentally friendly characteristics. Conventional research mainly concentrates on energy-saving speed profiles, where the energy level evaluation of the timetable is usually considered separately. This paper integrates the train driving control optimization and the timetable characteristics by analyzing the achievable tractive energy conservation performance and the corresponding boundaries. A calculation method for energy efficient driving control solution is proposed based on the Bacterial Foraging Optimization (BFO) strategy, which is utilized to carry out batch processing with timetable. A boundary identification solution is proposed to detect the range of energy conservation capability by considering the relationships with average interstation speed and the passenger volume condition. A case study is presented using practical data of Beijing Metro Batong Line and two timetable schemes. The results illustrate that the proposed optimized energy efficient driving control approach is capable of saving tractive energy in comparison with the conventional traction calculation-based train operation solution. With the proposed boundary identification method, the capability space of the energy conservation profiles with respect to the energy reduction and energy saving rate is revealed. Moreover, analyses and discussions on effects from different passenger load conditions are given to both the weekday and weekend timetables. Results of this paper may assist the decision making of rail operators and engineers by enhancing the cost effectiveness and energy efficiency.

A case study of lighting Turkish historic mosques using LEDs: Semsi Ahmet Pasha Mosque

2017 ◽  
Vol 50 (6) ◽  
pp. 894-910 ◽  
Author(s):  
L Erdem Atılgan ◽  
D Enarun
Keyword(s):  
Energy Efficient ◽  
Energy Savings ◽  
The World ◽  
Modern Technologies

There are more than 86,000 mosques in Turkey, 6733 of these being historic mosques. This study aims at developing a novel LED lantern for enhancing the interior illumination of Turkish historic mosques while providing significant energy savings. In order to accomplish this, an LED lantern design is carried out, the photometric results of which are analysed using the world renowned architect Sinan’s Semsi Ahmet Pasha Mosque from 1580 as a model. With this lantern, the target is to maintain the recommended illuminances and comfort conditions in the interior of historic mosques while achieving substantial energy savings and, at the same time, preserving the historic structure of the mosque. The study promotes the utilization of modern technologies and brings a novel, energy efficient and sustainable approach to Turkish historic mosques.

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