scholarly journals Assessment of the heat loss coefficient of a renovated historical dwelling using a co-heating test

2021 ◽  
Vol 2069 (1) ◽  
pp. 012085
Author(s):  
S Van de Putte ◽  
E Himpe ◽  
J Nonneman ◽  
M Steeman ◽  
A Janssens
Keyword(s):  
Energy Use ◽  
Field Measurements ◽  
High Energy ◽  
Building Envelope ◽  
Living Space ◽  
Design Calculations ◽  
Heating Test ◽  
Indoor Comfort ◽  
Better Than

Abstract Twelve quasi-identical almshouses with an architectural-historic value were reno-vated, because of their high energy use, poor indoor comfort and numerous moisture problems. Aerogel plaster was applied for the hygrothermal upgrade of the uninsulated brick walls, while limiting the reduction of living space in these very small houses and keeping the monumental character of the facades in their original state. Several quality assurance tests were executed to evaluate the quality of the renovation of the building envelope and to compare the results with the initial theoretical design calculations. It appeared that the existing materials performed considerably better than the assumed conservative default values. On the other hand, the newly installed insulation materials performed somewhat less than declared, for example due to on-site processing. This resulted in a strong overestimation of the improvement in thermal performance by the renovation works. Field measurements of the existing situation can help to close this gap.

scholarly journals Measurements of Energy Consumption and Environment Quality of High-Speed Railway Stations in China

Energies ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 168
Author(s):  
Bin Qian ◽  
Tao Yu ◽  
Haiquan Bi ◽  
Bo Lei
Keyword(s):  
Energy Consumption ◽  
High Speed ◽  
Energy Use ◽  
District Heating ◽  
Energy Performance ◽  
High Energy ◽  
Public Buildings ◽  
Railway Station ◽  
High Speed Railway

In recent years, the energy performance of public buildings has attracted substantial attention due to the significant energy-saving potential. As a semi-open high-space building, the high-speed railway station is obviously different from other public buildings and even traditional stations in terms of energy consumption and internal environment. This paper investigates the current energy consumption situation and environmental quality of 15 high-speed railway passenger stations in China. Results show that the energy consumption of the high-speed railway station is between 117–470 kWh/(m2·a). The energy consumption of the station is related to the area and the passenger flow. The energy use of the station using district heating is higher than that of the station without district heating in the same region. The higher glazing ratio induces good natural lighting in the station, but the uniformity of the lighting in the station is not good. The acceptable temperature range of passengers in winter is larger than that in summer. The average air change rate of the high-speed railway station is 3.2 h−1 in winter and 1.8 h−1 in summer, which is the main reason of high energy consumption of the HVAC (Heating Ventilation Air Conditioning) system in this kind of building.

Energy for Agriculture in the Twenty-first Century

1998 ◽  
Author(s):  
B. A. Stout
Keyword(s):  
Quality Of Life ◽  
Developing Countries ◽  
Energy Use ◽  
High Energy ◽  
Need Satisfaction ◽  
Social Progress ◽  
Human Needs ◽  
Adequate Food ◽  
High Level

Adequate food supplies and a reasonable quality of life require energy —both noncommercial and commercial forms. Energy is a prime mover of economic growth and development. Although the linkages between energy and development are complex and still imperfectly understood, energy undoubtedly fuels economic development. And the developing countries where most of the population growth is occurring face an energy crisis of staggering proportions. An ample energy supply is not an automatic guarantee of smooth economic advancement, social progress, or stability, but it is, indisputably, their essential precondition. The future of our increasingly interdependent world will thus be very much influenced by the success or failure of the developing countries to ensure a sufficient and sustainable flow of energy (Smil and Knowland, 1980). The global inequity in the use of commercial fuels is familiar. About 1.5 billion people live in countries where the per capita consumption is less than 7 gigajoules (GJ) y-1, and another 1.1 billion consume only 7-20 GJ y -. Let’s translate this into more meaningful terms: 7 GJ is the equivalent of about 180 1 of diesel fuel —or about 0.5 1 per day to cover all human needs, such as food production and cooking, shelter, heating, and clothing. Millions and millions of rural inhabitants use virtually no commercial fuel. Clearly, no one can achieve a desirable quality of life (QOL) with so little energy available (Leach, 1979). Many studies have related GNP and energy use, but scholars debate the correlation with QOL. When one considers that energy is required to produce all the basic needs of humans, it seems apparent that a relationship as shown in Figure 5.1 may exist. Morrison (1978) carried this concept a step further by expressing QOL as a function of energy use. At low levels of energy use (quadrant III), he hypothesized that basic need satisfaction is linearly related to energy use. As the amount of energy increases (quadrant II), two paths were hypothesized. Option A projects a linear relationship between QOL and energy use, whereas option B suggests an optimum QOL at a moderately high level of energy use, followed by a deterioration of QOL due to environmental degradation at excessively high energy use rates.

scholarly journals Analysing energy upgrading projects of single-family houses towards a Norwegian nZEB level

2021 ◽  
Vol 2069 (1) ◽  
pp. 012112
Author(s):  
R Moschetti ◽  
B Time ◽  
L Gullbrekken ◽  
V Heide ◽  
L Georges ◽  
...  
Keyword(s):  
Energy Use ◽  
Thermal Environment ◽  
Energy Performance ◽  
High Energy ◽  
Building Envelope ◽  
Interdisciplinary Teams ◽  
Single Family ◽  
Zero Energy ◽  
Use Of Resources ◽  
Definition Of

Abstract As the existing building stock is responsible for high energy use and greenhouse gas emissions, energy upgrading projects have been acknowledged as crucial for the energy performance improvement of existing buildings, as well as for environment preservation and rational use of resources. The aim of this article is to investigate the definition of a nearly zero-energy building (nZEB) level for the energy upgrading of single-family houses. In particular, the findings from a research project, i.e., “energy upgrading of wooden dwellings to nearly zero energy level” (OPPTRE), are presented and discussed. A core task of OPPTRE was to carry out an architectural competition, where six interdisciplinary teams proposed innovative solutions for upgrading to a nZEB level representative Norwegian wooden single-family houses, from the period 1950-1990. The upgrading measures proposed in the OPPTRE competition focused on several aspects, such as architectural quality, indoor thermal environment, energy use/generation, carbon footprint, and cost effectiveness. General principles for a nZEB level achievement in upgrading projects are discussed in this article, as deducted from the evaluation of the results of the OPPTRE architectural competition. In particular, the focus is on examining the solutions proposed for upgrading building envelope and technical building systems. Energy use, energy generation, investment costs, and CO2 emissions are examined across the various OPPTRE projects, striving to define a trade-off among different parameters for the achievement of a nZEB level. The findings of this paper support the creation of knowledge in nearly zero-energy upgrading of wooden single-family houses, aiming to a more systematic definition of a nZEB level in such projects. This can be relevant for several stakeholders, such as governmental institutions, homeowners, builders, and private or public decision makers, towards the market uptake of nZEB upgrading by 2030.

scholarly journals Energy-Sufficiency for a Just Transition: A Systematic Review

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2444
Author(s):  
Matthew J. Burke
Keyword(s):  
Systematic Review ◽  
Energy Use ◽  
Energy Transition ◽  
Well Being ◽  
High Energy ◽  
Complementary Approach ◽  
Maximum Quantity ◽  
Per Capita ◽  
Range Of Values

Efforts to achieve an energy transition often neglect to account for the levelling of benefits realizable with higher levels of energy use, despite knowledge of a saturation effect and recognition of increasing harms of use. This research examines energy sufficiency as a maximum quantity of energy associated with improvements in human well-being to inform a recalibration of energy targets among high-energy societies. A systematic review of recent research was performed to identify the point at which increasing levels of energy use no longer correlate with meaningful increases in well-being. For selected studies (n = 18), energy sufficiency values range from 60–221 gigajoules per capita per year with a mean of 132 gigajoules per capita per year for associated measures of well-being. The review finds agreement in a pattern of saturation and provides a range of values for energy sufficiency maximums, suggesting that a relatively modest amount and a diverse quality of energy is needed to support high levels of human well-being. Beyond the conventional emphasis on energy efficiency and renewable energy, energy sufficiency therefore offers a necessary and complementary approach for supporting just and ecological energy transitions.

scholarly journals Empirical and Numerical Analysis of an Opaque Ventilated Facade with Windows Openings under Mediterranean Climate Conditions

Mathematics ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 163
Author(s):  
Carlos-Antonio Domínguez-Torres ◽  
Ángel Luis León-Rodríguez ◽  
Rafael Suárez ◽  
Antonio Domínguez-Delgado
Keyword(s):  
Energy Consumption ◽  
Energy Use ◽  
Energy Savings ◽  
Field Measurements ◽  
Energy Performance ◽  
Total Energy Consumption ◽  
Building Stock ◽  
Climate Conditions ◽  
Ventilated Facade ◽  
Indoor Comfort

In recent years, there has been growing concern regarding energy efficiency in the building sector with energy requirements increasing worldwide and now responsible for about 40% of final energy consumption in Europe. Previous research has shown that ventilated façades help to reduce energy use when cooling buildings in hot and temperate climates. Of the different ventilated façade configurations reported in the literature, the configuration of ventilated façade with window rarely has been studied, and its 3D thermodynamic behavior is deserving of further analysis and modeling. This paper examines the thermal behavior of an opaque ventilated façade with a window, in experimentally and numerical terms and its impact in energy savings to get indoor comfort. Field measurements were conducted during the winter, spring and summer seasons of 2021 using outdoor full scale test cells located in Seville (southern Spain). The modeling of the ventilated façade was carried out using a three-dimensional approach taking into account the 3D behavior of the air flow in the air cavity due to the presence of the window. The validation and comparison process using experimental data showed that the proposed model provided good results from quantitative and qualitative point of view. The reduction of the heat flux was assessed by comparing the energy performance of a ventilated façade with that of an unventilated façade. Both experimental and numerical results showed that the ventilated façade provided a reduction in annual total energy consumption when compared to the unventilated façade, being compensated the winter energy penalization by the summer energy savings. This reduction is about 21% for the whole typical climatic year showing the ability of the opaque ventilated façade studied to reduce energy consumption to insure indoor comfort, making its suitable for use in retrofitting the energy-obsolete building stock built in Spain in the middle decades of the 20 century.

scholarly journals Renovation Strategies for Multi-Residential Buildings from the Record Years in Sweden—Profit-Driven or Socioeconomically Responsible?

2019 ◽  
Vol 11 (24) ◽  
pp. 6988 ◽  
Author(s):  
Kristina Mjörnell ◽  
Paula Femenías ◽  
Kerstin Annadotter
Keyword(s):  
Energy Efficiency ◽  
Energy Use ◽  
Housing Stock ◽  
Residential Buildings ◽  
High Energy ◽  
Building Envelope ◽  
Public And Private ◽  
Holistic Approaches ◽  
The People ◽  
Efficiency Measures

An important part of the multi-family housing stock in Sweden was built during the record years 1961–1975 and is in need of extensive renovation to be modernized. The stock is also at the center of political discussion of how to sustain ‘good housing for all’, especially in the rental sector. These renovation needs coincide with present energy targets and provides an opportunity to combine renovation with energy efficiency measures. Common for many of these buildings are that neglected maintenance has led to technical shortcomings, such as high energy use and low thermal comfort due to bad insulation, unsatisfactory air tightness and leaky windows, inefficient heating systems and insufficient ventilation, and moisture damage due to leaking building envelope and leaking pipes. However, the people living in these buildings are not willing to or cannot afford to pay the higher rents that extensive renovations would entail. Earlier research has highlighted the broader societal problem of energy renovations, but also that of housing companies’ priority of measures with short payback times, and those that give the possibility to raise rents. However, recent observations indicated a tendency towards more holistic approaches to housing renovation, and this study was initiated to investigate how public and private housing companies deal with renovation levels, rent increases and related social problems. The main conclusions are that sustainability and social responsibility are moving up on agendas in the public sector, but also, apparently, in the renovations strategies among the private companies. What is also seen is a trend moving from extensive total renovations to more tenant-adapted and step-by-step renovations. Renovation options which do not entail such large rent increases are increasingly being seen. Implications are that housing owners favor gentle renovation with reasonable rent increases of 10%–20%, which at the same time, may be a drawback for reaching energy efficiency targets.

scholarly journals Wind Catcher and Solar Chimney Integrated As An Alternative Ventilation For Urban Dense Settlements In Tropical Climate

2019 ◽  
Vol 3 (1) ◽  
pp. 51-68 ◽  
Author(s):  
Yoka Prima ◽  
Sugini Prima
Keyword(s):  
Energy Use ◽  
Tropical Climate ◽  
High Energy ◽  
Residential Areas ◽  
Solar Chimney ◽  
Fossil Energy ◽  
The Earth ◽  
Humid Tropical Climate ◽  
Tropical Climates

The high energy use for building operations in humid tropical climates is mostly used for operational mechanical ventilation such as air conditioning (AC) and fans. The use of large amounts of energy, especially fossil energy can reduce the quality of the environment, causing an increase in the temperature of the earth. Need more efforts for management of energy use by reducing fossil energy consumption. One effort that can be done is to replace mechanical production and utilize passive ventilation in buildings. this study is a literature review regarding the use of passive ventilation using a windcatcher integrated with solarc himneys. The use of windcatcher and the solar chimney is still very rare in Indonesia, but has the potential to solve thermal problems, especially in densely populated residential areas in cities that have the character of a humid tropical climate. The results of this study recommend criteria from windcatchers and soler chimney that might be applicable and adapt to the character of the urban humid tropical climate.   Keyword: Wind Catcher, Solar chimney, Passive Ventilation, Urban Dense Settlements

scholarly journals The problem of clothes drying in new homes in the UK

2016 ◽  
Vol 34 (4/5) ◽  
pp. 320-330 ◽  
Author(s):  
Della Madgwick ◽  
Hannah Wood
Keyword(s):  
Energy Efficient ◽  
Energy Use ◽  
High Energy ◽  
Building Envelope ◽  
Content Type ◽  
New Energy ◽  
Fit For Purpose ◽  
Tumble Dryer ◽  
The Uk

Purpose The current focus on air tight construction to minimise energy use in homes in the UK requires analysis of the behaviour of the occupants. The purpose of this paper is to review current literature and explore the methods used to dry clothes, to assess current standards and recommendation for the drying of laundry in new homes and the issues arising with increased moisture within the building envelope where there may be inadequate ventilation caused by impermeable design. Design/methodology/approach Literature is reviewed on new housing in the UK and as part of a wider study of behaviour questionnaires were delivered to occupants of a recently completed housing estate in the UK to ask the questions with regard to their laundry practice. Findings There are inherent problems in drying laundry in new air tight homes. This case study identifies 95 per cent of residents on a new estate own a tumble dryer and use either this high energy method for clothes drying or hang clothes internally within the property leading to higher energy use or potential mould growth. Research limitations/implications Further research is required into how drying laundry impacts on internal air quality in new homes designed to be energy efficient. Practical implications The design of new houses needs to be considered to provide a shift in people’s behaviour with regard to low energy clothes drying. Social implications Policy and regulation need to be changed urgently to ensure new homes are fit for purpose with regards to laundry drying. Originality/value Other research has focussed on tenants in social housing in properties of mixed ages. This is the first study which focusses specifically on new energy efficient housing for owner occupiers.

Kepuasan Masyarakat Terhadap Pelayanan Kelurahan Setelah Pemekaran Di Tangerang Selatan

Liquidity ◽  
2018 ◽  
Vol 2 (2) ◽  
pp. 151-159
Author(s):  
Pitri Yandri
Keyword(s):  
Public Perception ◽  
Service Personnel ◽  
Urban Services ◽  
Hospitality Workers ◽  
Care Workers ◽  
Before And After ◽  
Cartesian Diagram ◽  
Better Than

The purpose of this study is (1) to analyze public perception on urban services before and after the expansion of the region, (2) analyze the level of people's satisfaction with urban services, and (3) analyze the determinants of the variables that determine what level of people's satisfaction urban services. This study concluded that first, after the expansion, the quality of urban services in South Tangerang City is better than before. Secondly, however, public satisfaction with the services only reached 48.53% (poor scale). Third, by using a Cartesian Diagram, the second priority that must be addressed are: (1) clarity of service personnel, (2) the discipline of service personnel, (3) responsibility for care workers; (4) the speed of service, (5) the ability of officers services, (6) obtain justice services, and (7) the courtesy and hospitality workers.

Implementasi Voip Server Berbasis IPV6 Dengan Raspberry PI

2019 ◽  
Vol 9 (01) ◽  
pp. 47-54
Author(s):  
Rabbai San Arif ◽  
Yuli Fitrisia ◽  
Agus Urip Ari Wibowo
Keyword(s):  
Internet Protocol ◽  
Wireless Transmission ◽  
Raspberry Pi ◽  
Test Results ◽  
Average Delay ◽  
Ipv6 Network ◽  
Ip Network ◽  
Selection Of ◽  
Better Than

Voice over Internet Protocol (VoIP) is a telecommunications technology that is able to pass the communication service in Internet Protocol networks so as to allow communicating between users in an IP network. However VoIP technology still has weakness in the Quality of Service (QoS). VOPI weaknesses is affected by the selection of the physical servers used. In this research, VoIP is configured on Linux operating system with Asterisk as VoIP application server and integrated on a Raspberry Pi by using wired and wireless network as the transmission medium. Because of depletion of IPv4 capacity that can be used on the network, it needs to be applied to VoIP system using the IPv6 network protocol with supports devices. The test results by using a wired transmission medium that has obtained are the average delay is 117.851 ms, jitter is 5.796 ms, packet loss is 0.38%, throughput is 962.861 kbps, 8.33% of CPU usage and 59.33% of memory usage. The analysis shows that the wired transmission media is better than the wireless transmission media and wireless-wired.

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