Energy Efficiency Standards Research Articles

Development of Energy Demand Profile Based on Non-Historical and Non-Energy Variables: A Headquarters’ Offices Case Study

Under the Positive Energy Districts framework, cities authorities must be informed of the energy demand of districts to design tailor-made policies and strategies to promote the deployment of energy efficiency, sharing and transition actions. However, the diverse data sources and long procedures to collect data because of privacy permissions may result in a slow-down of the development of these roadmaps. To overcome these challenges, this paper is the outcome of the methodology developed under the UP2030 Project designed to estimate the energy demand and energy profile consumptions within urban areas to contribute to the stakeholders involved in decision making processes to inform them about the savings potential related with the use of energy in geographically delimitated areas. The methodology was validated in CIRCE’s headquarters, where the yearly energy estimation consumption is about 98% of the real energy consumed. The main finding of this study is obtaining a model that can estimate the energy usage for occupants’ comfort with minimal data required from the citizens’ side, which will allow stakeholders to consider global energy estimations at the district level in a fast and reliable way to design strategies in a timely manner as required by the energy transition and efficiency standards proposed by the European Union.

Regulation and Organisation of Housing Management Activities in Germany, Poland and Latvia

Abstract Multi-dwelling buildings are one of the essential infrastructural elements of a residential area. Therefore, qualitative and professional management of such real estate is of importance. The insufficient investment into maintenance and improvement of housing is stated in Latvian policy planning documents as one of the most significant problems, causing risks for achieving the goal of compliance of the housing fund with energy efficiency, construction, safety and amenity standards. The article examines the main aspects of management of residential buildings, identifies the related risks and offers solutions for their prevention. The article aims at emphasising the significance of building maintenance and exploring management processes of residential buildings in Latvia, Poland and Germany, making a comparison that helps to understand the housing management regulation and organisational approach in each country and identify their common and differing features. In the course of the research, the authors of the article review the sources on management activities of residential buildings, identify and assess the management process risks and make a comparative analysis of housing management processes in Latvia, Poland and Germany. Information regarding the housing management field of the countries examined in the article has been obtained by summarising and analysing the policy documents and regulatory enactments, as well as by interviewing Latvian, Polish and German experts. When analysing the obtained results, conclusions have been made with regards to political responsibility, legal regulation and professional competence requirements in the field of housing management.

Towards the Necessary Decarbonization of Historic Buildings: A Review

The critical and urgent issue of decarbonization by 2050 needs to include the existing historical built environment in the process of energy requalification. These buildings, subjected to heritage preservation, are extremely inadequate to the modern standards of energy efficiency and thermal comfort, and they exhibit the poorest energy performance. In this study, a review of the existing scientific literature on the matter of energy renovation processes applied to historic buildings is provided. The reviewed papers, selected from scientific databases, were initially categorized according to their reference scale—either individual buildings or urban contexts. Subsequently, the papers were grouped on the basis of the main energy efficiency levels they investigated. The goal is to offer a comprehensive overview of the materials, technologies and strategies currently in use, as well as future perspectives, to aid the ecological transition and foster sustainable development, all while preserving the artistic, cultural and architectural heritage of these buildings.

An analytical model of evaporator performance under frosting conditions for lumped-parameter simulations of heat pumps

Abstract Enhancing the energy efficiency of HVAC systems is crucial for meeting the nZEB standards. This involves developing analytical models for simulating building-system dynamics over time with low computational resources. However, existing models struggle with accuracy in heating mode due to evaporator frosting, a factor not usually accounted for commercial software. To address this, a new heat exchanger block that accurately models frosting and its impact on system performance is developed using the Simscape™ language in Simulink® environment. This innovative block enhances the predictive capability of heat-pump simulations that use a lumped-parameter approach, ensuring compatibility and easy integration with existing toolboxes. The improved model overcomes conventional limitations, offering reliable simulations in heating mode and providing insights into energy transport and efficiency. Incorporating accurate frosting representation aids in developing more effective defrost strategies, minimizing energy losses and improving compliance with energy efficiency standards.

Why do consumers purchase energy-efficient kitchen appliance? An analysis based on online review comments.

Kitchen appliances constitute a significant portion of residential energy consumption. Promoting consumer purchases of high-energy-efficient kitchen appliances can effectively facilitate the transition to a low-carbon society. However, the role of energy saving in the current purchasing behavior of Chinese consumers regarding kitchen appliances remains unclear. Based on user-generated content from online e-commerce platforms (N=59,908), this study investigates whether Chinese consumers consider energy efficiency and its influencing factors when purchasing kitchen appliances through natural language processing and structural equation modeling techniques. The study findings reveal that: (1): Perceived energy saving is an important consideration for consumers to adopt kitchen appliances. (2): Prices benefits increase consumers' willingness to purchase energy-efficient appliances. (3): Consumers prioritize energy saving in the purchase of large kitchen appliances. (4): the effect of perceived energy saving on intention to purchase kitchen appliances is much stronger among high energy-efficient appliances. The results of this study propose specific policy recommendations to ensure the continuity of current demand-side energy efficiency policies related to kitchen appliances, utilize pricing mechanisms to incentivize consumers to purchase high-energy-efficient appliances, emphasize the importance of energy consumption of different types of kitchen appliance in environmental education, and establish stricter energy efficiency standards for kitchen appliances.

Positive Obligations to Retrofit Buildings with Third-Party Effect under Private Law as an Instrument of Public Climate Policy

Abstract When incentives fail to encourage enough owners to make their buildings climate-proof, the State has to impose obligations to retrofit buildings if climate targets are to be reached. This contribution examines whether the State can employ obligations based upon agreement with third-party effect, to enforce higher energy-efficiency standards for buildings and an improved energy mix. It presents and compares the responses to two cases from eleven European jurisdictions. It shows that the majority of examined jurisdictions will allow for the State to impose positive obligations with third-party effect through a burden registered in favour of the State or a property right for the buyer. Only Dutch law would be likely to invalidate the obligation because the obligation circumvents public-law safeguards. A minority of the examined jurisdictions would not allow for a burden with positive obligations as its main content.

Towards effective implementation of building energy efficiency codes in Tripoli, Lebanon: Key actions for enforcement

Energy is vital for human life. However, the increasing global demand for and reliance on fossil fuels are significantly contributing to rising CO2 emissions. The Building Energy Efficiency Codes (BEECs) are a government initiative aimed at regulating CO2 emissions. BEECs support both national environmental goals and global climate change initiatives in Lebanon. The study aims to close the gap between the effectiveness of Lebanon's building energy codes and the country's environmental goals. It seeks to identify the key enforcement actions taken by the Trpl-M towards the successful implementation of the Building Energy Efficiency Code (BEEC). Tripoli was selected for its administrative independence and unique authority in enforcing building energy codes, including a dedicated technical department. This autonomy provides a valuable setting to explore compliance strategies and address regional challenges. This is achieved through an approach involving a literature review, case studies, and semi-structured interviews with employees from the Trpl-M Permit Office. The data is analyzed using a thematic analysis approach, providing a nuanced understanding of the implementation challenges within the employees' working environment. Findings suggest considering proactive design integration, third-party inspections, random compliance checks, penalties, and incentives to achieve high standards of energy efficiency and contribute to sustainable urban development and energy conservation in the region.

Design and thermal performance analysis of self-insulation concrete compound blocks

More than 60% of energy losses occur through the building envelope. Exterior wall insulation technology is widely used for wall insulation, but it is prone to cracking, falling off, and causing fires. Self-insulation concrete compound blocks (SIB) have attracted considerable attention in recent years for meeting building energy efficiency standards without the need for external insulation treatment. In this study, the shale ceramsite concrete (SCC) was prepared as the base material for the blocks through the orthogonal test and range analysis. In accordance with the insulation requirements of residential building walls, 12 types of self-insulation concrete compound blocks (SIB) were designed. The heat transfer process of these blocks was simulated and analyzed using Ansys Workbench, enabling a comparison of the thermal conductivity effects resulting from different hole distribution schemes in the insulation blocks. The simulated values were compared with the theoretical calculations, and the simulated results were in good agreement with the theoretical calculations. The results showed that TZ-12 exhibited the optimal hole configuration with a heat transfer coefficient of 0.5 W/(m2·K), which was 38.3% lower than that of the external insulation block TZ-9. Additionally, TZ-12 demonstrated the average compressive strength of 8.28 MPa and the minimum compressive strength of 7.45 MPa, meeting the requirements for MU7.5 strength grade and also satisfying the requirement of not less than MU5.0 when self-insulation blocks were used for external walls. The simulated heat flux rate of the self-insulation concrete compound block wall (SIBW) was 15.4 W, and its heat transfer coefficient was 0.56 W/(m2·K), which was 29.1% lower than that of the external thermal insulation wall (ETIW), meeting the design standard for achieving the 65% energy saving in residential buildings situated in regions with hot summers and cold winters.

Thermal Performance Analysis and Design Evolution of Ventilated Stone Facades: A Case Study of the Praski Student House (Akademik Praski) in Warsaw

The rationale for this work arose from the urgency of improving the energy efficiency of buildings at the design stage, given the changing requirements of energy efficiency standards such as the Polish Technical Conditions (WT 2014 and WT 2020). This research is novel as there is currently limited information available on the improvement of the thermal performance of ventilated stone facade systems, although they are now widely used due to their practical and aesthetic advantages. The first objective of this work is to evaluate the thermal performance of the ventilated facades of the Praski Student House (Akademik Praski) and to assess how certain design variations can help achieve a lower level of energy consumption. Using a comprehensive case study approach, this study provides accurate thermal calculations of the facade to assess its global thermal insulation coefficient (Rt) and thermal transmittance (Uc). The improvement in the actual U-value from the original design is as follows: the U-value is reduced from 0.33 originally to 0.228 for WT 2014 and to 0.198 for WT 2020, showing a reduction of about 30.9% and 13.2%, respectively. These results indicate the energy efficiency of increased insulation thickness and optimally oriented air gap dimensions. The practical contributions of this research are valuable for architects, engineers, and contractors involved in the design and construction process of buildings aiming to achieve near-zero energy buildings (nZEBs), including concrete suggestions on how to improve current construction practices as well as material recommendations. There is a need for durability studies, for example to assess the performance of such facades under different climatic conditions, as part of future work to support these findings.

Assessment of heating degree-days factor (HDDF) for building-oriented climate zoning in Türkiye

ABSTRACT In this study, a novel heating degree-days factor (HDDF) is proposed to determine the optimum facade design for buildings in Türkiye as a function of both cooling degree-days (CDD) and heating degree-days (HDD) data. For this purpose, the HDDF (HDD/(HDD+CDD)) is defined as the ratio of the heating degree-days of a region to the total heating and cooling degree-days. Firstly, the HDDF values of all provinces in Türkiye are calculated by using meteorological data from 81 meteorological stations covering the period 1991–2022, and HDDF performance is evaluated. Then, the building-oriented climate zoning is realized based on the HDDF values. Moreover, historical trends of monthly and yearly average HDD, CDD, and HDDF values are revealed and yearly HDD, CDD, and HDDF maps were created using the ArcGIS program. According to the results, HDDF values in Türkiye varied between 0.4519 and 0.9998, and HDDF values between 0.9 ≤ HDDF ≤ 1 cover 46 out of 81 cities in the country and span a broad area across the country. The findings suggest that if global warming continues at the current rate, cooling energy demand in the residential sector will dramatically increase in the future, while heating energy demand will fall in Türkiye. This indicates that domestic energy consumption regulations would require modification. The building-oriented climate zoning resulting from this study is unique to Türkiye and can aid engineers, architects, and policymakers in building energy efficiency programs, studies, regulations, and standards.

An analysis of the rebound impact of energy consumption and the factors that influence it in China's agricultural productivity

With China's agricultural sector being a major contributor to both the national economy and energy consumption, the rebound effect—the phenomenon where energy efficiency improvements lead to increased energy use—poses significant challenges to sustainable energy use. The motivation for this study stems from the need to understand the extent of this rebound impact and its underlying drivers, particularly in the context of China's agricultural modernization efforts. This study examines the rebound effect of energy consumption in China's agricultural productivity and the factors influencing it over the period from 1990 to 2023. Using a Generalized Method of Moments (GMM) model, this research analyzes the relationship between energy consumption, agricultural productivity, and several influencing factors, including technological innovation, rural-urban migration, and financial development. The results reveal that (1) energy efficiency improvements have led to a significant rebound effect in China's agricultural sector, limiting potential energy savings, (2) technological advancements have mitigated the rebound effect to some extent, but the effect remains substantial, (3) rural-urban migration has contributed to labor shortages, increasing mechanization and energy demand, and (4) financial development has positively influenced both agricultural productivity and energy use, exacerbating the rebound effect. The study suggests that policymakers should focus on developing stricter energy efficiency standards and promoting technological innovations that reduce energy intensity in agriculture, while also addressing labor migration challenges to curb the rebound impact and achieve more sustainable agricultural growth.

Evaluation of the Applicability of Waste Rubber in Insulation Panels with Regard to Its Grain Size and Panel Thickness.

This paper explores the effect of waste rubber grain size on the porosity, modulus of elasticity, thermal properties, and soundproofing performance of polymer composites with different thicknesses (10, 15, and 20 mm). All properties were tested in accordance with European standards, with the exception of porosity, which was measured using Archimedes' principle. The findings indicate that with a consistent amount of polyurethane glue, finer rubber grains result in composites with higher porosity, leading to a lower modulus of elasticity but enhanced thermal and sound insulation. In contrast, coarser rubber grains produced composites with lower porosity and a higher modulus of elasticity, though with slightly reduced thermal insulation and significantly worse soundproofing. A combination of fine and coarse rubber grains provided a balanced performance, offering both good thermal and sound insulation while maintaining a high modulus of elasticity. Among the thicknesses tested, 15 mm was identified as optimal, combining a relatively high modulus of elasticity, low thermal conductivity, and better airborne sound insulation index. Future research will focus on applying this composite in concrete building products that meet noise protection and energy efficiency standards.

Energy factors affecting environmental pollution for sustainable development goals: The case of India

This study investigates the nexus between electricity consumption, fossil fuel dependency, renewable energy adoption, population growth, trade activities, economic growth, and environmental pollution in India. The primary objective is to understand how these factors interrelate and influence each other, focusing on their implications for sustainable development. The study used data from the World Bank from 2000 to 2023; the methodology adopted includes vector autoregression modeling, Granger causality tests, cointegration analysis, impulse response functions, and variance decomposition. These econometric techniques were selected due to their ability to capture dynamic relationships, determine causality, and identify long-term equilibrium among the variables. The findings reveal that economic growth significantly increases electricity consumption and fossil fuel usage, leading to higher carbon dioxide emissions. On the other hand, renewable energy adoption reduces environmental pollution. The study also highlights the complex interplay between population growth, urbanization, and trade activities in shaping India's energy demand and environmental outcomes. The implications of these findings are critical for India's sustainable development. The results suggest that while economic growth is essential, it must be balanced with sustainable energy practices to mitigate environmental pollution. The findings emphasize the need for policy interventions that promote renewable energy, enhance energy efficiency, and enforce environmental regulations. Recommendations include accelerating renewable energy adoption, implementing stringent energy efficiency standards, and developing integrated policies that simultaneously address the economic, energy, and environmental dimensions. These actions will help India achieve a sustainable balance between economic growth and environmental protection, ensuring a healthier future for its population.

Understanding public acceptability of climate policies in Europe

ABSTRACT Urgent and decisive government action to mitigate greenhouse gas emissions is more likely when the proposed measures are popular among the public. This paper compares the drivers of European public support for three alternative policies to combat climate change: carbon taxation, renewable energy subsidies, and minimum energy efficiency standards that apply to household appliances. We combine survey data with regional socio-economic and environmental indicators to provide a comprehensive, comparative analysis of policy acceptance that accounts for the geographic context in which these policies would be implemented. By comparing the drivers among three climate policies, we identify a rural-urban gap in predicting public perception of carbon taxation, which does not exist in the other policies. We also found a positive relationship between regional exposure to fine particular matter (PM2.5) and public support for climate policy, providing novel insights into the influence of environmental factors on public perceptions. This research highlights the importance of environmental and socio-economic context in predicting climate policy acceptance and offers valuable implications for policymakers seeking to garner public support for effective climate change mitigation strategies.

Shadow economy, energy consumption, and ecological footprint in Indonesia

The shadow economy consists of economic activities that take place without government oversight, often bypassing energy efficiency standards, leading to higher energy consumption and greater ecological footprints. This study examines the impact of the shadow economy and energy consumption on Indonesia's ecological footprint using the ARDL model and various robustness check methods. Results indicate that both factors positively contribute to increasing the ecological footprint. Economic growth and population density, included in the model, also positively impact the ecological footprint, exacerbating strain on natural resources and ecosystems through unsupervised human activities. Policy recommendations are provided to address these findings.

The Building Decarbonization in High-Density Cities: Challenges and Solutions

Abstract Decarbonization of buildings is an imperative and challenging task. Beyond the common challenges associated with building decarbonization, those in high-density urban areas also face technical challenges due to geographical conditions and resource endowments. As decarbonization practices deepen, it has been found that reliance on conventional methods is fraught with difficulties, primarily due to the high proportion of incremental costs involved. This review study explores methods not widely incorporated into existing building energy efficiency standards but which hold the potential for aiding decarbonization. It advocates for a synergistic strategy involving surrounding infrastructure such as power and other building energy systems, innovative low-carbon building materials, and greenery to facilitate this transition.

POLICY DRIVERS OF CHINA'S INTEGRATED ENERGY SERVICES: A CURRENT STATUS REVIEW

Conventional energy production and consumption patterns seriously restrict global sustainable development. In the energy transformation process, integrated energy services play a key role in integrating clean energy and renewing energy consumption patterns. The European Union, the United States, and Japan are leading in developing policy frameworks and integrating integrated energy services. This paper compares and analyzes how the European Union, the United States, Japan, and China respond to the challenges of energy transformation through different energy policy systems. The energy policy systems of the European Union, the United States, and Japan are discussed for reference by China. The review reveals that (1) assigning tasks based on the energy transformation strength of each region is conducive to accelerating the speed of carbon emission reduction in each region; (2) continuous government support and targeted incentives are conducive to attracting market capital, thereby stimulating the advancement of energy technology; and (3) formulating energy efficiency standards for basic equipment can lay a good foundation for energy transformation.

Laser Weeding Technology in Cropping Systems: A Comprehensive Review

Weed infestations pose significant challenges to global crop production, demanding effective and sustainable weed control methods. Traditional approaches, such as chemical herbicides, mechanical tillage, and plastic mulches, are not only associated with environmental concerns but also face challenges like herbicide resistance, soil health, erosion, moisture content, and organic matter depletion. Thermal methods like flaming, streaming, and hot foam distribution are emerging weed control technologies along with directed energy systems of electrical and laser weeding. This paper conducts a comprehensive review of laser weeding technology, comparing it with conventional methods and highlighting its potential environmental benefits. Laser weeding, known for its precision and targeted energy delivery, emerges as a promising alternative to conventional control methods. This review explores various laser weeding platforms, discussing their features, applications, and limitations, with a focus on critical areas for improvement, including dwell time reduction, automated navigation, energy efficiency, affordability, and safety standards. Comparative analyses underscore the advantages of laser weeding, such as reduced environmental impact, minimized soil disturbance, and the potential for sustainable agriculture. This paper concludes by outlining key areas for future research and development to enhance the effectiveness, accessibility, and affordability of laser weeding technology. In summary, laser weeding presents a transformative solution for weed control, aligning with the principles of sustainable and environmentally conscious agriculture, and addressing the limitations of traditional methods.

Analyzing the environmental impact of fuel switching: Evidence from ARDL analysis for policy considerations

The rise in global temperatures, driven by increased CO2 levels, is a pressing concern. Developing nations like Malaysia face challenges in transitioning to cleaner energy due to resource constraints, making natural gas a crucial transitional solution. This study introduces the Fuel Switch Variable to analyze the impact of shifting fuel consumption patterns on CO2. Using data from 1980 to 2020 and the ARDL model, findings show that policies promoting natural gas over oil and coal reduce CO2 emissions, while economic and population growth increase emissions. Policymakers should incentivize fuel switching, enforce energy efficiency standards, and invest in new technologies.

Health risk assessment of residential overheating under the heat waves in Guangzhou

During extreme heatwave events, indoor overheating caused by power outages poses a significant threat to human health, especially for low-income groups exposed to hot and humid conditions for extended periods. However, currently, the definition and quantification standards for indoor overheating are not well-defined, and relying solely on thermal comfort indicators is insufficient to accurately assess the health risks associated with indoor overheating. This study proposes the use of maximum heat index (HImax) and heat index hazard hours when the heat index exceeds the caution level (HIHHCaution) to assess the health risk of indoor overheating. Taking various types of residential buildings in Guangzhou as examples, the study employs field surveys, simulation analysis, and statistical regression to analyze the impact of power outages during heatwaves on the indoor thermal environment and key human thermal physiological parameters, thereby establishing the basis for measuring indoor overheating and reference thresholds for assessing heat health risks. The results indicate that for young adults and the elderly, HIHHCaution exceeding 1174 °C·h and 850 °C·h respectively, or HImax nearing 55 °C, are likely to result in heat-related illnesses. In Guangzhou, most urban village housing with poor insulation cannot withstand the risk of power outages lasting more than a day during heatwaves, while old housing and commodity housing that meets the energy-efficiency standards of different periods still face varying degrees of indoor overheating risk. The findings enhance understanding of indoor overheating health risks and provide a scientific basis for strategies to improve living environments during heatwaves.