scholarly journals A full 34 factorial experimental design for the low energy building’s external wall

2020 ◽  
Vol 24 (2 Part B) ◽  
pp. 1261-1273
Author(s):  
Tugce Pekdogan ◽  
Sedat Akkurt ◽  
Tahsin Basaran
Keyword(s):  
Experimental Design ◽  
Climatic Conditions ◽  
Building Envelope ◽  
Low Energy ◽  
Statistical Experimental Design ◽  
Effective Parameters ◽  
Heating And Cooling ◽  
Anova Table ◽  
Low Energy Buildings ◽  
Factor Interactions

The low energy building concept is based on improving the building envelope to reduce heating and cooling loads. Improvements in building envelopes depend not only on climatic conditions but also on insulation. In this study, the thermal performance of external walls was studied by using a three-level full factorial statistical experimental design. An opaque wall in low energy buildings was chosen in order to study the effect of selected factors of city (A), orientation (B), insulation location (C), and month of the year (D) on heat loss or gain. A software was used to calculate the ANOVA table. As a result, all three factors of months of the year, city and orientation of the building fa?ade were found to be significant factor effects for heat transfer. Two-factor interactions of AB, AD, BD, and CD were found to be significant. Therefore, the effects of season, location and orientation were successfully shown to be effective parameters.

Thermal Bridges Minimizing through Typical Details in Low Energy Designing

2014 ◽  
Vol 899 ◽  
pp. 62-65 ◽  
Author(s):  
Rastislav Ingeli ◽  
Boris Vavrovič ◽  
Miroslav Čekon
Keyword(s):  
Energy Efficiency ◽  
Thermal Insulation ◽  
Energy Demand ◽  
Building Energy ◽  
Building Envelope ◽  
Low Energy ◽  
Building Energy Efficiency ◽  
Low Energy Buildings ◽  
Thermal Bridges ◽  
The Impact

Energy demand reduction in buildings is an important measure to achieve climate change mitigation. It is essential to minimize heat losses in designing phase in accordance of building energy efficiency. For building energy efficiency in a mild climate zone, a large part of the heating demand is caused by transmission losses through the building envelope. Building envelopes with high thermal resistance are typical for low-energy buildings in general. In this sense thermal bridges impact increases by using of greater thickness of thermal insulation. This paper is focused on thermal bridges minimizing through typical system details in buildings. The impact of thermal bridges was studied by comparative calculations for a case study of building with different amounts of thermal insulation. The calculated results represent a percentage distribution of heat loss through typical building components in correlation of various thicknesses of their thermal insulations.

scholarly journals A prospective Study on the Evolution of Airtightness in 41 low energy Dwellings

2020 ◽  
Vol 172 ◽  
pp. 05005
Author(s):  
Stijn Verbeke ◽  
Amaryllis Audenaert
Keyword(s):  
Pressure Difference ◽  
Air Permeability ◽  
Building Envelope ◽  
Low Energy ◽  
Low Energy Buildings ◽  
Construction Type ◽  
Passive Houses ◽  
A Prospective Study ◽  
Pressurisation Test

Airtightness of the building envelope is an important parameter affecting the performance of (low energy) buildings. In case the airtightness is effectively measured, this is typically only done once as part of the commissioning of the construction work. Several factors could affect the evolution of the airtightness of the envelope after the building is constructed. In this work, follow-up airtightness tests have been carried out to investigate the evolution of the performance in the interval of 0.5 up to 12 years compared to the original pressurisation test. The results on 41 low-energy dwellings indicate that the airtightness is indeed not a fixed value over time. Of the 41 buildings, 29 display an increased air permeability resulting in an increase of up to 200% in relative terms or up to 1.36 ACH50 (air changes per hour at 50 Pa pressure difference [h-1]). Conversely, four of the buildings in the dataset show a significant improvement of the airtightness; resulting in a decrease of air leakage of up to -1.19 ACH50. Analysis of the data shows that on average the air permeability at 50 Pa pressure difference increased by 38%, but with great variation depending multiple factors such as initial airtightness value and construction type. This corresponds to an average increase of the specific air permeability of the building envelope of 0.15 m³/(h·m²). Most of the buildings under analysis are low energy buildings or passive houses which were very airtight at time of construction. Despite the observed evolution in air permeability, many buildings under investigation can still be considered sufficiently airtight a few years after initial construction.

scholarly journals Evaluation of the Performance of a Building Envelope Constructed with Phase-Change Materials in Relation to Orientation in Different Climatic Regions

2019 ◽  
Vol 111 ◽  
pp. 04003
Author(s):  
Eda Köse ◽  
Gülten Manioğlu
Keyword(s):  
Energy Consumption ◽  
Phase Change ◽  
Phase Change Material ◽  
Phase Change Materials ◽  
Climatic Conditions ◽  
Building Envelope ◽  
Climatic Regions ◽  
Heating And Cooling ◽  
Energy Consumptions ◽  
Change Material

Minimizing the effect of climatic conditions and energy consumption in buildings are important issues to be considered in the building design process. Due to the changes in climatic conditions, there is an increase not only in the consumption of heating energy but also cooling energy. Certain passive measures to be taken primarily for the building envelope are necessary in order to reduce energy consumption. Applying a phase-change material on the surface of a building envelope is one of the new approaches for controlling heat transfer through the building envelope during the cooling period. It is known that phase-change materials, which are also considered as modern versions of thermal mass concept, can reduce the of a building’s heating and cooling energy consumption. In this study, a unit with 10m to 10m dimension with one external facade in a 3 storey building was evaluated in two cities, Istanbul and Diyarbakır, in temperate-humid and hot dry climatic regions. In order to reduce heating and cooling loads, a phase-change material was applied on the surface of the building envelope. The thickness of the phase-change material on the applied surface was increased at every step, and different building envelope alternatives were created. Heating and cooling energy consumptions were calculated for different orientations of the external facade. When calculated values are evaluated comparatively, it is seen that as the thickness of the phase-change material increases, the energy loads occurred in the unit decrease gradually. Equally, the performance of the phase-change materials varies depending on the orientation. Therefore, it is possible to determine the optimum thickness and orientation combination of the phase-change material application on a building envelope and reduce heating and cooling energy consumptions.

Numerical investigation on building envelope optimization for low-energy buildings in low latitudes of China

2019 ◽  
Vol 13 (2) ◽  
pp. 257-269 ◽  
Author(s):  
Tianqi Zhang ◽  
Dengjia Wang ◽  
Hui Liu ◽  
Yanfeng Liu ◽  
Hang Wu
Keyword(s):  
Numerical Investigation ◽  
Building Envelope ◽  
Low Energy ◽  
Low Latitudes ◽  
Low Energy Buildings

Thermal Bridges Impact on Energy Need for Heating in Low Energy Wooden House

2016 ◽  
Vol 820 ◽  
pp. 139-145
Author(s):  
Rastislav Ingeli ◽  
Jozef Podhorec ◽  
Miroslav Čekon
Keyword(s):  
Thermal Resistance ◽  
Energy Efficient ◽  
Building Envelope ◽  
Cold Climate ◽  
Low Energy ◽  
Energy Efficient Buildings ◽  
Low Energy Buildings ◽  
High Thermal Resistance ◽  
Thermal Bridges ◽  
The Impact

Energy need for heating is depend on the heat loss of the builing. It is essential to minimize heat losses when designing and building energy efficient buildings. For an energy-efficient building in a cold climate, a large part of the space heating demand is caused by transmission losses through the building envelope. The low-energy buildings are enevelope construction with high thermal resistance. The impact of thermal bridges was studied by comparative calculations for a case study building with different amounts of insulation. In the low-energy buildings are envelope construction with high thermal resistance. When more insulation is used the relative impact of thermal bridges increases. In these buildings is necessary to specify each thermal bridges. This thesis deals with the influence of thermal bridges on energy need for heating in low energy wooden houses.

scholarly journals ENERGY BALANCE OF A LOW ENERGY HOUSE

2012 ◽  
Vol 18 (3) ◽  
pp. 369-377 ◽  
Author(s):  
Rasa Džiugaitė-Tumėnienė ◽  
Vidmantas Jankauskas ◽  
Violeta Motuzienė
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Renewable Energy Sources ◽  
Energy Systems ◽  
Energy Performance ◽  
Building Envelope ◽  
Low Energy ◽  
The European Union ◽  
Consumption Data ◽  
Low Energy Buildings

Currently, such topics as improvement of energy efficiency of buildings and energy systems, development of sustainable building concepts, and promotion of renewable energy sources are in the focus of attention. The energy efficiency targets of the European Union are based on information regarding energy consumed by buildings. The amount of energy consumed by buildings depends on the main influencing factors (namely, climate parameters, building envelope, energy systems, building operation and maintenance, activities and behaviour of occupants), which have to be considered in order to identify energy efficiency potentials and opportunities. The article aims to investigate the total amount of energy consumed by a low energy house, built in Lithuania, using a combination of energy consumption data received from a simulation and measured energy consumption data. The energy performance analysis in the low energy house revealed some factors that have the main influence on the total figures of energy consumed by the house. The identified significant factors were used to find the optimal solutions for the design of low energy buildings.

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