scholarly journals Thermal Performance Optimization and Experimental Evaluation of Vacuum-Glazed Windows Manufactured via the In-Vacuum Method

Energies ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3634
Author(s):  
Jaesung Park ◽  
Myunghwan Oh ◽  
Chul-sung Lee
Keyword(s):  
Energy Efficiency ◽  
Heat Flow ◽  
Thermal Performance ◽  
Performance Optimization ◽  
Residential Building ◽  
Vacuum Method ◽  
The Difference ◽  
Insulation Performance ◽  
Manufacturing Time ◽  
Indoor And Outdoor

Windows are essential in buildings; however, they have poor thermal performance, so extensive research has been conducted on improving their performance. In this study, we developed vacuum-glazed windows with excellent insulation via the in-vacuum method, which shortens the manufacturing time and vacuuming degree considerably. In addition, the configuration of the pillars, low-emissivity (low-e) coating, and frame from a thermal performance perspective was experimentally optimized. The results revealed that the optimal pillar placement spacing is 40 mm and that the low-e coating surface must be located inside the vacuum layer to maximize insulation performance. The vacuum-glazed window produced by the in-vacuum method was applied to an actual residential building to investigate its thermal performance, which was compared with that of a triple-glazed window. The results showed that the center-of-glazing heat flow of the vacuum-glazed window was approximately 0.8 W/m2K lower than that of the triple-glazed window. The difference between the average indoor and outdoor surface temperatures during the nighttime was found to be up to 35.1 °C for the vacuum-glazed window and 23.1 °C for the triple-glazed window. Therefore, the energy efficiency of the building can be greatly improved by applying vacuum windows manufactured via the in-vacuum method and optimized for the best thermal performance.

scholarly journals The influence of envelopes in the thermal performance of residential buildings, from the perspective of bioclimatic architecture

2021 ◽  
Vol 2042 (1) ◽  
pp. 012157
Author(s):  
Emeli Lalesca Aparecida da Guarda ◽  
Veronica Martins Gnecco ◽  
Artur Martins Kamimura ◽  
Martin Ordenes Mizgier ◽  
Michele Fossati
Keyword(s):  
Energy Efficiency ◽  
Thermal Comfort ◽  
Thermal Performance ◽  
Residential Buildings ◽  
Hvac Systems ◽  
The Other ◽  
Basic Construction ◽  
Indoor Thermal Comfort ◽  
Efficiency Measures ◽  
Indoor And Outdoor

Abstract Energy efficiency measures (EEMs) and their impact on the thermal performance of buildings as well as on the user's thermal comfort, have become the focus of several studies. Bioclimatic strategies can contribute to improving thermal performance while increasing indoor thermal comfort for users. This paper aims to verify the bioclimatic potential of two types of dwellings in three Brazilian cities. The first one is the baseline, with basic construction systems. The other includes EEMs. The method consists of the verification of bioclimatic potential by psychometric charts for indoor and outdoor conditions. The results show significant indoor discomfort caused by heat in both dwellings—thermal comfort conditions during more than 95% of annual hours in Manaus, and during 85% in São Paulo. Therefore, energy efficiency strategies such as shading, ventilation and HVAC systems are necessary to promote thermal comfort conditions in hot climates.

scholarly journals Calculation of Building Heat Losses through Slab-on-Ground Structures Based on Soil Temperature Measured In Situ

Energies ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 114
Author(s):  
Iwona Pokorska-Silva ◽  
Marta Kadela ◽  
Bożena Orlik-Kożdoń ◽  
Lidia Fedorowicz
Keyword(s):  
Heat Flux ◽  
Heat Flow ◽  
Soil Temperature ◽  
Geometric Model ◽  
Residential Building ◽  
Numerical Analyses ◽  
Ground Structure ◽  
The Difference ◽  
Wall Foundation

The article aims to assess the effects of soil temperature measured in situ on the heat loss analyses of a building. Numerical analyses and in situ measurements of soil temperature profiles for real conditions under a residential building (profile I) in Poland and under the area outside the building (profile II) were performed. Based on the measurement results, a proprietary geometric model of the partition was proposed. The heat flux and heat flow results obtained for reliable models are 4.9% and 6.9% higher compared to a model based on a typical meteorological year for the wall–foundation system and 10.0% and 10.1% higher for the slab-on-ground structure for profile I. The adoption of temperatures from the area outside the building as the boundary condition (profile II) results in greater differences between the obtained results. The difference in heat flow obtained in the numerical analyses for profiles I and II is about 2 W/m2, both for the wall–foundation system and for the slab-on-ground structure calculations. The adoption of temperatures for the ground outside the building led to overestimation in the heat flux calculations, this being due to lower temperatures in these particular layers of the ground.

The Study on Design Solution for Energy Efficiency of Existing Residential Building (EEERB) to Realize the 4th Energy Efficiency Target

2014 ◽  
Vol 1044-1045 ◽  
pp. 664-667
Author(s):  
Zhao Rui Zhang ◽  
Feng Xie ◽  
Yu Lin Liu ◽  
Qian Cai
Keyword(s):  
Energy Efficiency ◽  
Thermal Performance ◽  
Residential Building ◽  
Design Solution ◽  
Design Standards ◽  
New Energy ◽  
Specific Project

Based on new energy efficiency design standards of Beijing and specific project, this paper focuses on finding reasonable design solution for EEERB to realize the 4th energy efficiency target by diagnosing energy efficiency and judging thermal performance.

The Research on Energy Efficiency of Residential Building in Guangzhou

2013 ◽  
Vol 368-370 ◽  
pp. 1308-1313
Author(s):  
Zhi Hong Li ◽  
Li Hua Zhao ◽  
Xiao Shan Yang
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Thermal Performance ◽  
Residential Building ◽  
Green Building ◽  
Building Energy ◽  
Building Energy Efficiency ◽  
Standard Value ◽  
Energy Efficiency Standard ◽  
Assessment Standard

Nowadays, greenhouse effect and energy shortage are becoming more and more fiercely, the development of the green building is the necessary choice to building sustainable development. Building energy efficiency is one of the most important parts of green building, and the draft of Assessment standard for green building puts forward clear requirements for decreasing energy consumption just by improving the thermal performance of the envelop to get more score for declaring the green building label project. In view of the scale extending of the green building label project in the future, the paper studied on the energy efficiency design of the residential envelop in Guangzhou by investigation and simulation to achieve the decreasing ranges of energy consumption more than 10% of building energy efficiency standard value, and provided a technical measures for the energy efficiency ratio 60% just by improving the thermal performance of the envelop.

THE GREEN ROOF THERMAL PERFORMANCE EVALUATION IN COMPARISON TO ASBESTOS CEMENT TILES APPLIED TO LIGHT STEEL FRAME BRAZILIAN BUILDINGS

2018 ◽  
Vol 12 (3) ◽  
pp. 288
Author(s):  
Angélica Felicidade Guião Marcato Costa ◽  
João Alexandre Paschoalin Filho ◽  
Tatiana Tucunduva Philipi Cortese ◽  
Brenda Chaves Coelho Leite
Keyword(s):  
Performance Evaluation ◽  
Relative Humidity ◽  
Heat Flow ◽  
Thermal Performance ◽  
Green Roof ◽  
Steel Frame ◽  
Internal Temperature ◽  
Green Cover ◽  
Asbestos Cement ◽  
Data Representative

This research aimed at comparing the thermal performance provided in experimental modules, one of which was performed with conventional cover, made of asbestos cement tiles; an another with green cover. The structure of the studied modules was executed using Light Steel Frame technique. As an experimental research, modules were built in a wide place, without the interference of shading. Instruments were installed in the inner part of the modules to measure the following data: air temperature, relative humidity. From the collected data, representative episodes have been chosen for the studies that aimed to compare the comfort provided by both modules, built with different roofs. As result, it was verified that the module with green roof had better performance than the module covered with asbestos cement tile in all selected episodes. The module covered with green roof maintained lower internal temperature variation throughout the days, indicating that the green roof has characteristic thermal insulation, reducing the heat flow from the roof.

ON COMPARATIVE ANALYSIS OF PERFORMANCE OPTIMIZATION METHODS OF MULTI-PUMP UNITS

2020 ◽  
pp. 23-28
Author(s):  
A.I. Glushchenko ◽  
M.Yu. Serov
Keyword(s):  
Energy Efficiency ◽  
Control System ◽  
Comparative Analysis ◽  
Performance Optimization ◽  
Optimization Methods ◽  
Online Optimization ◽  
New Approach ◽  
Advantages And Disadvantages ◽  
Analysis Of Performance

В статье рассматривается вопрос совершенствования системы управления параллельно-работающими насосными агрегатами с целью повышения энергоэффективности их работы. Проведено сравнение и выявление недостатков существующих методов решения рассматриваемой проблемы. Предложена идея нового подхода на базе онлайн оптимизации. The problem under consideration is improvement of the energy efficiency of a control system of parallel-running pump units. Known methods used to solve this problem are considered. Their advantages and disadvantages are shown. Finally, the idea of a new approach, which is based on online optimization, is proposed.

Wireless Sensor Network in IoT and Performance Optimization

2020 ◽  
Vol 13 ◽  
Author(s):  
Sunita Gupta ◽  
Sakar Gupta ◽  
Dinesh Goyal
Keyword(s):  
Energy Efficiency ◽  
Wireless Sensor Networks ◽  
Energy Harvesting ◽  
Performance Optimization ◽  
Design Space ◽  
Life Time ◽  
Wireless Sensor ◽  
Topology Management ◽  
Management Application ◽  
Energy Latency

: A serious problem in Wireless Sensor Networks (WSNs) is to attain high-energy efficiency as battery is used to power and have limited stored energy. They can’t be suitably replaced or recharged. Appearance of renewable energy harvesting techniques and their combination with sensor devices gives Energy Harvesting Wireless Sensor Networks (EHWSNs). IoT is now becoming part of our lives, comforting simplifying our routines and work life. IoT is very popular . It connects together, computes, communicates and performs the required task. IoT is actually a network of physical devices or things that can interact with each other to share information. This paper gives an overview of WSN and IoT, related work, different ways of connecting WSN with internet, development of smart home, challenges for WSN etc. Next a Framework for performance optimization in IoT is given and QC-PC-MCSC heuristic is analyzed in terms of Energy Efficiency and Life Time of a sensor on Energy Latency Density Design Space, a topology management application that is power efficient. QC-PC-MCSC and QC-MCSC are compared for Energy Efficiency and Life Time of a sensor over energy latency density design space, a topology management application.

scholarly journals Prognostic Assessment of the Performance Parameters for the Industrial Diesel Engines Operated with Microalgae Oil

2021 ◽  
Vol 13 (11) ◽  
pp. 6482
Author(s):  
Sergejus Lebedevas ◽  
Laurencas Raslavičius
Keyword(s):  
Energy Efficiency ◽  
Diesel Engine ◽  
High Speed ◽  
Performance Parameters ◽  
Prognostic Assessment ◽  
High Speed Diesel ◽  
Microalgae Oil ◽  
The Difference ◽  
Smoke Opacity ◽  
Efficiency Indicators

A study conducted on the high-speed diesel engine (bore/stroke: 79.5/95.5 mm; 66 kW) running with microalgae oil (MAO100) and diesel fuel (D100) showed that, based on Wibe parameters (m and φz), the difference in numerical values of combustion characteristics was ~10% and, in turn, resulted in close energy efficiency indicators (ηi) for both fuels and the possibility to enhance the NOx-smoke opacity trade-off. A comparative analysis by mathematical modeling of energy and traction characteristics for the universal multi-purpose diesel engine CAT 3512B HB-SC (1200 kW, 1800 min−1) confirmed the earlier assumption: at the regimes of external speed characteristics, the difference in Pme and ηi for MAO100 and D100 did not exceeded 0.7–2.0% and 2–4%, respectively. With the refinement and development of the interim concept, the model led to the prognostic evaluation of the suitability of MAO100 as fuel for the FPT Industrial Cursor 13 engine (353 kW, 6-cylinders, common-rail) family. For the selected value of the indicated efficiency ηi = 0.48–0.49, two different combinations of φz and m parameters (φz = 60–70 degCA, m = 0.5 and φz = 60 degCA, m = 1) may be practically realized to achieve the desirable level of maximum combustion pressure Pmax = 130–150 bar (at α~2.0). When switching from diesel to MAO100, it is expected that the ηi will drop by 2–3%, however, an existing reserve in Pmax that comprises 5–7% will open up room for further optimization of energy efficiency and emission indicators.

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