scholarly journals The modifications to the requirements on energy savings and thermal insulation of buildings in Poland in the years 1974-2021

2015 ◽  
Vol 14 (1) ◽  
pp. 145-154 ◽  
Author(s):  
Anna Życzyńska ◽  
Tomasz Cholewa
Keyword(s):  
Heat Transfer ◽  
Energy Consumption ◽  
Energy Demand ◽  
Energy Savings ◽  
Building Energy ◽  
The European Union ◽  
Transfer Coefficients ◽  
Total Energy Consumption ◽  
Heat Transfer Coefficients ◽  
Technical Requirements

Residential and public buildings use for heating more than 40% of the total energy consumption in the European Union. Therefore, this paper discusses the modifications to the building energy standard, which is currently in force. It is based on the requirements included in the Polish technical building regulations and standards. The proper energy-saving police have been implemented to this kind of consumers to diminish the energy consumption. The analysis pertains to the values of heat transfer coefficients of building partitions as well as the indexes of the energy demand for various types of buildings. The analysis was conducted between 1974 and 2013. Moreover; the changes within this range, which will come into force in 2014 and will continue to 2021, which act in accordance with the technical requirements suitable for buildings, were also discussed. Furthermore, minimal thicknesses of insulation materials which enable meeting this requirements of a heat transfer coefficient for building partitions, were examined in the article.

scholarly journals Effects of Different Surface Heat Transfer Coefficients on Predicted Heating and Cooling Loads towards Sustainable Building Design

Buildings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 609
Author(s):  
Yanwen Wu ◽  
Wenna Jian ◽  
Liu Yang ◽  
Tengyue Zhang ◽  
Yan Liu
Keyword(s):  
Heat Transfer ◽  
Energy Efficiency ◽  
Energy Consumption ◽  
Building Design ◽  
Building Energy ◽  
Surface Heat ◽  
Outdoor Environment ◽  
Transfer Coefficients ◽  
Surface Heat Transfer ◽  
Heat Transfer Coefficients

The transfer of surface heat between a building and the outdoor environment is the energy transfer channel and it is important for the energy efficiency of buildings. Early stage building design is a critical stage and it can directly determine the energy consumption by a building. Therefore, selecting appropriate surface heat transfer coefficients (SHTCs) is a key issue in building energy consumption prediction. In this study, EnergyPlus was employed to investigate the building load in Chinese cities with different SHTCs: (1) constant SHTCs based on national standards; and (2) dynamically changing SHTCs based on the Thermal Analysis Research Program (TARP). Based on investigations of the hourly load, daily cumulative load in a typical day, and annual cumulative load with different SHTCs, corrections for the annual cumulative load were obtained according to the relative deviations between the results produced with the TARP model and traditional SHTCs. The greatest relative deviations were 67.5% and 25.3% for the building shape factor φ = 0.49 and 0.29 in Lhasa. The relative deviations were 13.3% and 12.0% for φ = 0.49 in Xi’an and Beijing, respectively. Corrections were not essential for other conditions because the relative deviations were lower than 5.0%. Considering the current characteristics of engineering calculations and the need to obtain more accurate design results, dynamically changing SHTCs should be applied. These correction factors can obtain more accurate results for the current building energy efficiency system with traditional SHTCs.

scholarly journals Performance of falling film plate evaporators in reconstructed multiple-effect evaporation station in sugar factory

2006 ◽  
Vol 10 (4) ◽  
pp. 55-61 ◽  
Author(s):  
Zoltan Zavargo ◽  
Aleksandar Jokic ◽  
Bojana Prodanic ◽  
Jasna Grbic ◽  
Rada Jeftic-Mucibabic
Keyword(s):  
Heat Transfer ◽  
European Union ◽  
Energy Consumption ◽  
General Trend ◽  
Regional Level ◽  
Energy Requirements ◽  
Falling Film ◽  
Evaporation Process ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients

General trend of free trade in regional level as well as in the direction of European Union has motivated sugar factories located in Serbia to invest into technologies that are more efficient in order to make their products more competitive at the markets in Europe. The aim of this work was to evaluate effects of falling film plate evaporators on the energy consumption of evaporation plant, as well as to validate performance of this type of evaporators. It was found that this type of evaporator decreased energy requirements and in the same time evaporation process was more effective due to high values of heat transfer coefficients. .

Automotive painting process: Minimizing energy consumption by using adjusted convective heat transfer coefficients

2020 ◽  
Vol 140 ◽  
pp. 105479
Author(s):  
Esley Silva Cavalcante ◽  
Luís Gonzaga Sales Vasconcelos ◽  
Gilvan Wanderley de Farias Neto ◽  
Wagner Brandão Ramos ◽  
Romildo Pereira Brito
Keyword(s):  
Heat Transfer ◽  
Energy Consumption ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Painting Process ◽  
Convective Heat Transfer Coefficients

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 Endoreversible Modeling of a Hydraulic Recuperation System

Entropy ◽  
2020 ◽  
Vol 22 (4) ◽  
pp. 383 ◽  
Author(s):  
Robin Masser ◽  
Karl Heinz Hoffmann
Keyword(s):  
Heat Transfer ◽  
Energy Saving ◽  
Energy Savings ◽  
Dynamical Behavior ◽  
Real Data ◽  
Pipe Diameter ◽  
Transfer Coefficients ◽  
Hydraulic Unit ◽  
Energy Saving Potential ◽  
Heat Transfer Coefficients

Hybrid drive systems able to recover and reuse braking energy of the vehicle can reduce fuel consumption, air pollution and operating costs. Among them, hydraulic recuperation systems are particularly suitable for commercial vehicles, especially if they are already equipped with a hydraulic system. Thus far, the investigation of such systems has been limited to individual components or optimizing their control. In this paper, we focus on thermodynamic effects and their impact on the overall systems energy saving potential using endoreversible thermodynamics as the ideal framework for modeling. The dynamical behavior of the hydraulic recuperation system as well as energy savings are estimated using real data of a vehicle suitable for application. Here, energy savings accelerating the vehicle around 10% and a reduction in energy transferred to the conventional disc brakes around 58% are predicted. We further vary certain design and loss parameters—such as accumulator volume, displacement of the hydraulic unit, heat transfer coefficients or pipe diameter—and discuss their influence on the energy saving potential of the system. It turns out that heat transfer coefficients and pipe diameter are of less importance than accumulator volume and displacement of the hydraulic unit.

scholarly journals A Methodology to Investigate the Deviations between Simple and Detailed Dynamic Methods for the Building Energy Performance Assessment

Energies ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 6217
Author(s):  
Ilaria Ballarini ◽  
Andrea Costantino ◽  
Enrico Fabrizio ◽  
Vincenzo Corrado
Keyword(s):  
Energy Demand ◽  
Dynamic Models ◽  
Building Energy ◽  
Energy Performance ◽  
Transfer Coefficients ◽  
Study Approach ◽  
Heat Transfer Coefficients ◽  
Heating And Cooling ◽  
Cooling Loads ◽  
Physical Phenomena

The research investigates the validity of the simple hourly method, as introduced by the EN ISO 52016-1 standard, for the assessment of the building energy demand for heating and cooling, by comparing it with a detailed dynamic model (EnergyPlus). A new methodology is provided to identify and quantify the causes of deviations between the models. It consists in the split of the contributions of the air heat balance (AHB) equation by dynamic driving force, and in the adoption of consistency options of the modeling parameters related to specific physical phenomena. A case study approach is adopted in the article to achieve the research objective. The results show that the deviations in the heating and cooling loads between the two calculation methods can be mainly ascribed to the use of different surface heat transfer coefficients, and to a different modeling of the extra thermal radiation to the sky. Providing a methodology to validate the calculation method, this work is intended to contribute to the enhancement of the use of simple dynamic models and to the improvement of the standardization activity.

Influences of External Windows on Energy Consumption of Industrial Buildings in Cold Areas

2011 ◽  
Vol 250-253 ◽  
pp. 3055-3058 ◽  
Author(s):  
Hong Wei Wang ◽  
Ya Dong Zheng ◽  
Fang Wen Tu
Keyword(s):  
Heat Transfer ◽  
Energy Consumption ◽  
Energy Saving ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Industrial Buildings ◽  
Different Types ◽  
Insulation Performance ◽  
The Heat Transfer Coefficient ◽  
Plastic Steel

Shenyang is located in the cold areas and main industy city in China. The most current industrial buildings can’t meet the demand of energy-saving standard because of the thermal insulation performance of the windows.This paper aims at using DeST software to analyze industrial workshop energy consumption, according to different types of external windows and window-wall ratio of buildings to provide reference for energy saving design of industrial buildings in Shenyang area.The thermal performance of the windows has great effect on the heat load. The lower the heat transfer coefficient of windows is, the more beneficial for energy saving of the buildings. The window-wall ratio has great effect on the energy consumption, and different heat-transfer coefficients possess various sensitivity for window-wall ratio, and reflective glass varis smaller than the others.It is better for energy saving to replace the conventional windows with plastic-steel reflective glass windows.

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