scholarly journals INTEGRATED EVALUATION OF EXTERNAL WALL INSULATION IN RESIDENTIAL BUILDINGS USING SWARA-TODIM MCDM METHOD

2014 ◽  
Vol 20 (1) ◽  
pp. 103-110 ◽  
Author(s):  
Audrius Ruzgys ◽  
Robertas Volvačiovas ◽  
Česlovas Ignatavičius ◽  
Zenonas Turskis

A great part of energy produced in Europe is consumed by old residential buildings. Consequently, it is necessary to retrofit energetically non-efficient buildings. However, there is a mass financial gap between cost effective retrofitting and upgrading to nearly zero energy building levels. The efficiency of apartment building modernization under current requirements applicable in Lithuania and the requirements for 2020 was analysed, focusing on thermal insulation of external walls. Six cases of residential building modernization in Lithuania were studied estimating criteria that are among the most important for implementation of apartment building modernization, such as the total cost of the external wall modernization, simple payback period, work duration, and other parameters related to the characteristics of thermal insulation systems. The weights of the criteria were calculated after an expert survey and using integrated SWARA-TODIM multi-criteria decision-making (MCDM) method the best alternatives were ranked. After analyzing the differences between the current situation and upcoming requirements for rendered and ventilated type of façades, it can be stated that the final result depends more on price, duration of works, payback period, energy losses and water vapour diffusion than on the type of façade or insulation requirements applied at present or future.

2021 ◽  
Vol 14 (1) ◽  
pp. 44-50
Author(s):  
S. Nikolenko ◽  
Svetlana Sazonova ◽  
N. Akamsina

The main damages in brick structures of buildings are considered. The purpose of the work is to analyze the results of a technical examination of the building structures of a residential building, with the subsequent development of proposals for their restoration and strengthening. The object of the study is the brick structures of the house. The process of organizing a technical survey of brick residential buildings, which allows to determine the procedure for collecting and storing data, is considered. Modern solutions for the restoration of building structures are proposed. The physical deterioration of the apartment building was determined and recommendations were given for the elimination of brickwork defects.


Author(s):  
Joowook Kim ◽  
Hyunwoo Lim ◽  
Moncef Krarti

Korea relies significantly on imported fossil fuels to meet its energy needs. Moreover, about 50% of Korean residential buildings are apartment complexes. In this paper, the use of distributed generation (DG) technologies to serve the energy requirements for a typical Korean apartment complex is explored to reduce Korea’s dependence on fossil fuel and CO2 emissions. In particular, a series of sensitivity analyses is conducted using detailed simulation tools to determine the cost-effectiveness of DG systems to meet electrical and thermal loads of an apartment building in Daegu, Korea. The DG systems considered in the analysis include Photovoltaic (PV), Wind turbine, Microturbine, and Fuel Cell. The apartment complex is connected to the utility grid that with electricity typically generated using fossil fuels. It is found that a combination of the grid and Fuel Cell is the most cost effective approach to meet the electrical and thermal loads of the complex residential building with a cost of energy reduction of 12% compared to the grid only option.


2018 ◽  
Vol 245 ◽  
pp. 06006 ◽  
Author(s):  
Olga Gamayunova ◽  
Mikhail Petrichenko ◽  
Tatyana Musorina ◽  
Eliza Gumerova

On the example of a typical residential multi-apartment building, a feasibility study was carried out on the choice of energy-saving measures for the thermal insulation of facades. The decision to increase the energy efficiency of the building was made on the basis of calculating the loss of thermal energy through the external walls. Based on the parameters of the heating period, capital costs for additional thermal insulation of facades and calculated values of operating costs for heating, the optimum thickness of the additional layer of insulation is determined, in which the payback period assumes a minimum value.


2014 ◽  
Vol 1073-1076 ◽  
pp. 1263-1270 ◽  
Author(s):  
Feng Qian

The text elaborates on the significance and profile of insulation system for external wall of residential buildings in our country, makes comprehensive comparison among the external wall's self-insulation system, external wall's internal insulation system, sandwich composite insulation system and external wall's external insulation system, and reveals that the external wall's external insulation system has the advantage of strong feasibility, law cost, effective heat insulation break bridge and protective structure, which offers great potential for existing buildings in energy-saving rebuilding, thus finding a widest application and enjoying a promising market prospects.


Author(s):  
Derya B. O¨zkan ◽  
Cenk Onan

In Turkey, “Thermal Insulation Requirements for Buildings” was implemented to provide energy saving in buildings in 2000. After this, more then seven hundred thousand new buildings are constructed. Determining the correct material and optimum insulation thickness are very important issues in these buildings for thermal insulation. Calculations using monthly outdoor temperatures and solar radiation are done for XPS insulation material and 4 different climatic regions in Turkey. Natural gas, the most preferred in our country is selected as fuel. P1-P2 method is used to obtain energy saving and payback period. New correlations are specified to determine optimum insulation thickness depending on building heat gains and areas. Furthermore, buildings are categorized into three building class according to external wall area and floor/roof area. Effect of change in building external wall area, floor or roof area, window area to payback period, energy saving and optimum thickness are investigated. As a result, effect of architectural design is determined on thermal insulation. All calculation results are shown in a table for four different climatic regions and three different types of buildings which have the same gross volume.


2014 ◽  
Vol 1004-1005 ◽  
pp. 1565-1569
Author(s):  
Yu Ze Tian ◽  
Yang Yu

This paper introduces the present situation of existing residential building energy saving reconstruction of Anshan area, the result of the analysis is that the renovation of retaining structure is the key of the reconstruction of existing residential buildings of Anshan. Exterior wall area ratio of the total area of the building envelope accounts for quite large, so transformation of exterior wall is the key. Energy saving wall approach divided into external wall insulation and exterior insulation. Analysis of energy-saving measures by the external wall insulation, and the external wall of a residential district in Anshan city and analysis of thermal insulation and energy saving renovation case, better energy-saving effect, energy saving measures of external economy more external insulation, the region has provided the reference and basis transformation of external wall energy-saving residence building.


2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Maurizio Carlini ◽  
Sonia Castellucci ◽  
Silvia Cocchi ◽  
Elena Allegrini ◽  
Ming Li

Biomass is increasingly used for energy generation since it represents a useful alternative to fossil fuel in order to face the pollutions and the global warming problem. It can be exploited for heating purposes and for supplying domestic hot water. The most common applications encompass wood and pellet boilers. The economic aspect is becoming an important issue in order to achieve the ambitious targets set by the European Directives on Renewable Sources. Thus, the present paper deals with the economic feasibility of biomass boiler plants with specific regard to an existing residential building. An Italian case study is further investigated, focusing the attention on European and national regulations on energy efficiency and considering the recent public incentives and supporting measures. The main thermoclimatic parameters—that is, heating degree days (HDDs), building thermal insulation and thermal needs—are taken into account. Moreover, the following economic indicators are calculated: cumulative cash flow, discounted cumulative cash flow, payback period (PP), net present value (NPV), Internal rate of return (IRR), discounted payback period (DPP), and profit index (PI).


2014 ◽  
Vol 936 ◽  
pp. 1496-1501
Author(s):  
Chu Ne Li ◽  
Gang Wang ◽  
Ya Jun Wang

Based on the comparison of external wall with different insulation thicknesses and without insulation, residential buildings energy consumption was simulated by using hourly energy consumption simulation software DeST-h in Lanzhou.The effects of external wall insulation on building energy consumption were analyzed. The result shows that the total annual load can be reduced to 42% ~ 72% with the insulation thicknesses vary from 10mm to 80mm. But With the increase of the thickness of the insulation layer, the amount of fluctuation of building load reduce gradually.That is not to say the insulation layer is thicker the energy saving effect is more distinct and there is shoud be the thickness is the most economical thickness. So the economic insulation thickness is determined as 40mm by using a life-cycle cost analysis.


2021 ◽  
Vol 263 ◽  
pp. 04051
Author(s):  
Akymbek Abdykalykov ◽  
Erkin Boronbaev ◽  
Ulukbek Begaluev ◽  
Kamoliddin Holmatov ◽  
Nurbubu Zhyrgalbaeva

Widespread low-rise residential buildings with a seismically resistant concrete frame and brick infill walls have lower microclimate levels in cold seasons due to low temperatures on the inner wall corner surfaces.These temperatures are lower if there is a corner column. For Bishkek, this temperature is 4.6 °C lower than that for permissible microclimate, even when the external wall has the required 70 mm of mineral wool slab insulation. It is caused by the negative effect of the wall corner thermal bridge. This effect is determined by ArchiCAD 20 software packages by visualizing the temperature distribution in the cross-section of the corner, which needs an additional thermal insulation layer of 40 mm. Using the LiraSAPR 2013 software package, the authors reduced the square cross-section dimensions of the column by 40 mm to allow for that additional thermal insulation layer. The optimal width of this layer is determined for different options for the meeting angle of two external walls from 70° to 180°. For a typical 90° angle, an acceptable width is 860 mm. With this insulation, it is possible to achieve the required temperature at the corner. The authors eliminated the negative thermal effect of the corner by rounding it with cement-sand plaster. Using the isotherms, it was determined that the rounding radius of 300 mm allowed for equal temperatures on the corner and inner surface of the external walls. The achieved results show that the microclimate formed as in a room without external wall corners.


Author(s):  
Eugeniy V. Khitsenko ◽  

The purpose of the study is to identify the main typological, space-planning, constructive, stylistic and town-planning features of residential buildings designed by the Municipal union of Novosibirsk housing cooperatives in the years of the first five-year plan. Research objectives: 1) To substantiate the need for a transition to stone construction and the benefits of the development of quarterly residential buildings in Novosibirsk during the first five-year plan; 2) Determine the main types and types of housing, the development of which was engaged Gorshilsoyuz in the study period; 3) Analyze the most characteristic objects designed by Gorzhilsoyuz in the 1930s. The method of work is based on a comprehensive analysis of archival materials from the Novosibirsk State Archive (GANO) and funds of the Museum of the History of Architecture of Siberia named after S.N. Balandin (Novosibirsk), as well as literary sources and materials of periodicals. The novelty of the research lies in the fact that for the first time, based on an analysis of residential building projects created by the Gorzhilsoyuz, their architectural and typological features and compositional and stylistic features are identified and compared in detail. Founded in 1925, the Municipal union of Novosibirsk housing cooperatives (Gorzhilsoyuz) began its activities with the design of wooden residential buildings for housing cooperatives. In the years of the first five-year plan, this organization switched to the design of stone multi-apartment residential buildings based on socialist type housing principles. If in the previous period, most residential buildings had a unified space-planning solution, which did not include other functions besides housing, in 1928–1932 the city began to embody the original projects of new types of not only multi-family buildings, but also quarterly residential complexes, which included in their structure public housing and service facilities. The first example of a quarter residential development of the city was the “garden-quarter of a new type” of the housing cooperative “Pechatnik”. The design of residential buildings involved professionals Gorzhilsoyuz. The corner multisection apartment building had in the ground floor: shops, a dining room, a pharmacy, a kindergarten, a red corner; in the basement were: showers, bathrooms and laundry. Decorative belts and rizalits were the main architectural elements of the main facade. In 1929–1930 housing cooperatives “Medrabotnic” and “Khimik” built two corner multi-section residential buildings according to the projects of the Gorzhilsoyuz. Multi-apartment building “Medrabotnic” consists of four sections. Standard ordinary end sections had two apartments on the floor: three- and four-room apartments, each of which housed a kitchen, a bathroom, and a bathroom. A store was designed on the first floor of the rotary section, and on each floor above are two three-room apartments (without bathrooms) and one four-room (second to fourth floor) apartments. The residential building of the “Khimik” was the first five-story building in Novosibirsk and was conceived as a communal house. The house provided separate sleeping areas for: adults and children. However, due to the change in the ideological line of the government, the project was converted into an apartment building with shops on the ground floor. The facades of the house spatially overlap with the facades of the building “Medrabotnic”. The residential four-storey building of the housing cooperative “Rabochaya piatiletka”, built in 1930 according to the drawings of the Gorzhilsoyuz, was designed as a communal house. The project was supposed to accommodate people in separate age groups. On the ground floor there was a dining room with a kitchen, administrative rooms and bedrooms for the elderly. On the second floor there were the bedrooms of adults and children of eight years of age. The third and fourth floors were occupied by bedrooms of adults and children up to 16 years. Half of the fourth floor had social functions. The basement was allocated for laundry, boiler room and pantry products. However, in connection with the Decree of the Central Committee of the CPSU (b) “On work on the restructuring of life” (dated May 16, 1930), the dormitory was re-planned, and later became an administrative building.


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