scholarly journals Design and Manufacture of a Novel Sunlight Guiding Panel

Coatings ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 562
Author(s):  
Wei-Hsuan Hsu ◽  
Yi-Zhang Xie
Keyword(s):  
Energy Consumption ◽  
Nanoimprint Lithography ◽  
Window Glass ◽  
Elevation Angle ◽  
Experimental Investigations ◽  
Technological Advancement ◽  
Total Energy Consumption ◽  
Application Potential ◽  
Simulation Results ◽  
Design And Manufacture

With technological advancement, energy consumption and lack of energy supply are inevitable. Approximately 20% of total energy consumption is used for artificial light in standard office buildings. To reduce energy consumption for illumination purposes, a sunlight guiding panel was used to increase the amount of sunlight available indoors. However, in most designs of a sunlight guiding panel, the panel has to be placed on the outdoor surface of a window glass. This type of design is inconvenient for assembling and cleaning. To enhance the practicality of a sunlight guiding panel, we attempted to place the sunlight guiding panel on the indoor surface of a window glass. The simulation results revealed that when the sunlight guiding panel was placed on the indoor surface of a window glass, the aspect ratio of the light-guiding structure of the sunlight guiding panel had to be increased for guiding the sunlight from outdoors so as to increase the amount of sunlight indoors. To fabricate the proposed sunlight guiding panel, UV nanoimprint lithography was applied to pattern the light-guiding structure of the sunlight guiding panel. Moreover, a mold with a high-precision light-guiding structure was used in UV nanoimprint lithography. The mold was fabricated using ultraprecision machining technology. Both analytical and experimental investigations were conducted to confirm the proposed design. The average light-guiding efficiency was 89.9% with a solar elevation angle range of 35° to 65°, and the experimental results agreed well with the simulation results. This study elucidates light-guiding efficiency when the sunlight guiding panel is placed on the indoor surface of a window glass, which can increase the usage convenience and application potential of sunlight guiding panels.

scholarly journals Uniform Heating and Cooling of a Hollow Disc with Internal Water Channels

2018 ◽  
Vol 10 (1) ◽  
pp. 1
Author(s):  
Karel Adamek
Keyword(s):  
Numerical Simulation ◽  
Energy Consumption ◽  
Practical Problem ◽  
Temperature Uniformity ◽  
Uniform Temperature ◽  
Uniform Heating ◽  
Total Energy Consumption ◽  
Heating And Cooling ◽  
Working Cycle ◽  
Simulation Results

The paper deals with practical problem of uniform temperature of heated or cooled disc mass. It presents the influence of thermal insulation and of inlets/outlets positioning on temperature uniformity and on total energy consumption during working cycle. Together with essential balances of mass and energy there is used the method of flow numerical simulation. Results can be used for increasing of both productivity and thermal effectivity of observed equipment.

scholarly journals Dynamic analysis of temperature and heat gains in classrooms with different type of windows

2006 ◽  
Vol 10 (4) ◽  
pp. 219-227
Author(s):  
Radojka Krneta ◽  
Miroslav Bjekic ◽  
Aleksandar Peulic ◽  
Snezana Dragicevic
Keyword(s):  
Energy Consumption ◽  
Total Energy ◽  
Heat Losses ◽  
Sampling Time ◽  
School Buildings ◽  
Total Energy Consumption ◽  
Serbia And Montenegro ◽  
Simulation Results ◽  
Digital Temperature Sensor ◽  
Consumption Efficiency

Energy consumption in buildings, in schools as well, in Serbia and Montenegro is significantly higher than is defined in world?s energy standards. Heating energy is the biggest part of total energy consumption in schools. Energy losses through the windows reach up to 40% of total energy for heating of building that points out the importance of economically usage and saving of energy. This paper presents one-week analysis of temperatures and heat gains for two classrooms with different type of windows. The analysis is performed by Design Builder software. Due to heat losses analyses continual measurements of ambient and outside temperatures with sampling time of one hour have been performed. The measurements were performed in two classrooms; in one classroom, there are old windows with wood frames, whereas in the other there are new PVC windows. The system for temperature measuring was realized based on microcontroller and a digital temperature sensor. Taking into account measured and simulation results, the relevant conclusions were performed regarding energy consumption efficiency for school buildings heating. .

Energy savings potential of new aeration system: Full scale trials

2012 ◽  
Vol 7 (4) ◽  
Author(s):  
A. Lazić ◽  
V. Larsson ◽  
Å. Nordenborg
Keyword(s):  
Control System ◽  
Energy Consumption ◽  
Total Energy ◽  
Energy Savings ◽  
Treatment Plant ◽  
Full Scale ◽  
Total Energy Consumption ◽  
Aeration System ◽  
Fine Bubble ◽  
Aeration Control

The objective of this work is to decrease energy consumption of the aeration system at a mid-size conventional wastewater treatment plant in the south of Sweden where aeration consumes 44% of the total energy consumption of the plant. By designing an energy optimised aeration system (with aeration grids, blowers, controlling valves) and then operating it with a new aeration control system (dissolved oxygen cascade control and most open valve logic) one can save energy. The concept has been tested in full scale by comparing two treatment lines: a reference line (consisting of old fine bubble tube diffusers, old lobe blowers, simple DO control) with a test line (consisting of new Sanitaire Silver Series Low Pressure fine bubble diffusers, a new screw blower and the Flygt aeration control system). Energy savings with the new aeration system measured as Aeration Efficiency was 65%. Furthermore, 13% of the total energy consumption of the whole plant, or 21 000 €/year, could be saved when the tested line was operated with the new aeration system.

scholarly journals Crushed Bricks: Demolition Waste as a Sustainable Raw Material for Geopolymers

2021 ◽  
Vol 13 (14) ◽  
pp. 7572
Author(s):  
Gigliola D’Angelo ◽  
Marina Fumo ◽  
Mercedes del Rio Merino ◽  
Ilaria Capasso ◽  
Assunta Campanile ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Building Materials ◽  
Mechanical Performance ◽  
Raw Materials ◽  
Construction Material ◽  
Raw Material ◽  
The European Union ◽  
Total Energy Consumption ◽  
Demolition Waste ◽  
Crushed Brick

Demolition activity plays an important role in the total energy consumption of the construction industry in the European Union. The indiscriminate use of non-renewable raw materials, energy consumption, and unsustainable design has led to a redefinition of the criteria to ensure environmental protection. This article introduces an experimental plan that determines the viability of a new type of construction material, obtained from crushed brick waste, to be introduced into the construction market. The potential of crushed brick waste as a raw material in the production of building precast products, obtained by curing a geopolymeric blend at 60 °C for 3 days, has been exploited. Geopolymers represent an important alternative in reducing emissions and energy consumption, whilst, at the same time, achieving a considerable mechanical performance. The results obtained from this study show that the geopolymers produced from crushed brick were characterized by good properties in terms of open porosity, water absorption, mechanical strength, and surface resistance values when compared to building materials produced using traditional technologies.

scholarly journals Adaptive offloading in mobile-edge computing for ultra-dense cellular networks based on genetic algorithm

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Zhuofan Liao ◽  
Jingsheng Peng ◽  
Bing Xiong ◽  
Jiawei Huang
Keyword(s):  
Genetic Algorithm ◽  
Energy Consumption ◽  
Cellular Networks ◽  
Physical Distance ◽  
Edge Computing ◽  
Base Stations ◽  
Mobile Edge Computing ◽  
Total Energy Consumption ◽  
Average Delay ◽  
Server Selection

AbstractWith the combination of Mobile Edge Computing (MEC) and the next generation cellular networks, computation requests from end devices can be offloaded promptly and accurately by edge servers equipped on Base Stations (BSs). However, due to the densified heterogeneous deployment of BSs, the end device may be covered by more than one BS, which brings new challenges for offloading decision, that is whether and where to offload computing tasks for low latency and energy cost. This paper formulates a multi-user-to-multi-servers (MUMS) edge computing problem in ultra-dense cellular networks. The MUMS problem is divided and conquered by two phases, which are server selection and offloading decision. For the server selection phases, mobile users are grouped to one BS considering both physical distance and workload. After the grouping, the original problem is divided into parallel multi-user-to-one-server offloading decision subproblems. To get fast and near-optimal solutions for these subproblems, a distributed offloading strategy based on a binary-coded genetic algorithm is designed to get an adaptive offloading decision. Convergence analysis of the genetic algorithm is given and extensive simulations show that the proposed strategy significantly reduces the average latency and energy consumption of mobile devices. Compared with the state-of-the-art offloading researches, our strategy reduces the average delay by 56% and total energy consumption by 14% in the ultra-dense cellular networks.

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