Integrated Life Cycle Energy and Greenhouse Gas Analysis of Exterior Wall Systems for Residential Buildings

Broun, Reza; Babaizadeh, Hamed; Zakersalehi, Abolfazl; Menzies, Gillian Frances

doi:10.3390/su6128592

Cited by 11 publications

(4 citation statements)

References 19 publications

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“…Energy content of materials refers to the energy used to acquire raw materials, manufacture and transport them to a building site and energy incurred at the time of construction of the roof [41,42]. OPE subcriterion considers the necessary energy to heat and cool a building as a key factor in the operating energy, and therefore, in the building's life cycle energy demand [43]. The energy efficiency of a building depends not only on the thermal properties and heat capacity of the materials used, but also on its shape.…”

Section: Setting Hierarchy Structure In Medium Span Roofsmentioning

confidence: 99%

Implementing Sustainability Criteria for Selecting a Roof Assembly Typology in Medium Span Buildings

et al. 2015

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Technological advances have allowed the development of new roof assembly typologies with higher efficiency and less waste. However, in the construction sector the focus is generally on reducing cost and not in sustainable development factors. Short-sighted building planning based only on economic criteria should be avoided improving decision support systems. In addition, the selection of an appropriate roof assembly in a building's design stage is a complex problem due to the existence of different tangible and intangible factors and the multiple alternatives available. The roof typologies under study involve prefabricated concrete, steel and laminated wood structures. This research work applies a multi-criteria hybrid model combining the Analytical Hierarchy Process with the Delphi method and the VIKOR technique for implementing sustainability criteria in the selection of a roof assembly in medium span buildings. The proposed decision support system enables the use of the triple bottom line that considers economic, social and environmental criteria. Under the criteria analyzed, the compromise solution found is the self-supporting curved system.

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Section: Setting Hierarchy Structure In Medium Span Roofsmentioning

confidence: 99%

Implementing Sustainability Criteria for Selecting a Roof Assembly Typology in Medium Span Buildings

et al. 2015

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“…In addition, buildings are expected to be increasingly efficient, in particular with respect to heat exchange through the walls [3,4]. In recent years, designers have promoted the idea of incorporating plants into building envelopes to address ecological [5][6][7], aesthetic [8] and energy aspects [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Unsteady Coupled Moisture and Heat Energy Transport through an Exterior Wall Covered with Vegetation

2021

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A mathematical model that governs unsteady coupled moisture and heat energy transport through an exterior wall covered with vegetation is described. The unknown temperature and moisture content of the plants and canopy air are represented by a system of nonlinear ordinary differential equations (ODEs). The transport of moisture and heat through the support structure, which includes insulation and soil layers, is defined in a series of nonlinear partial differential equations (PDEs). After setting out the model, this article presents and discusses a set of numerical applications. First, a simplified system consisting of a brick wall covered with climbing vegetation is used to study the role of individual variables (e.g., wind speed, minimum stomatal internal leaf resistance, leaf area index, and short-wave extinction coefficient) on the hygrothermal behaviour of the green wall. Thereafter, more complex green wall systems comprising a bare concrete wall, mortar, cork-based insulation (ICB), soil and vegetation are used to evaluate the influence of the thermal insulation and substrate layers on the heat flux distribution over time at the interior surface of the wall, and on the evolution of the relative humidity, water content, and temperature throughout the cross section of the green wall. The numerical experiments proved that vegetation can effectively reduce exterior facade surface temperatures, heat flux through the building envelope and daily temperature fluctuations.

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“…e external wall is the main part of the building envelope [24,25]. Among the energy consumption of the building envelope, the heat consumption of the external wall accounts for the largest proportion [26,27]. us, it is an important measure to reduce building energy consumption and improve the indoor thermal environment by optimizing the thermal design and structural design of external walls.…”

Section: Introductionmentioning

confidence: 99%

Research on Energy-Saving Design of Rural Building Wall in Qinba Mountains Based on Uniform Radiation Field

Zhao

Fan

Wang

et al. 2020

Mathematical Problems in Engineering

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How to create a healthy and comfortable indoor environment without causing a substantial increase in energy consumption has become a strategic problem that the development of all countries must face and solve. According to the climatic conditions of Qinba Mountains in China, combined with the characteristics of local rural residential buildings and residents’ living habits, the field survey and theoretical analysis were used to study the thermal environment status and the heating energy consumption condition of local rural residential buildings. The thermal design method of walls for the local rural energy-saving buildings based on the indoor uniform radiation field was explored by using the outdoor comprehensive temperature function expressed by the fourth-order harmonic Fourier series as the boundary condition of the wall thermal analysis. ANSYS CFX was adopted to study the suitability of the energy-saving wall structure designed by the above method. The results show that the indoor thermal environment of local rural residential buildings in winter is not ideal and the heating energy consumption is high, but this area has the geographical advantage to develop solar energy buildings. It is proposed that the indoor thermal comfort temperature of local rural residential buildings in winter should not be lower than 14°C. When the internal surface temperature of the external walls in different orientations are equally based on the design principle of uniform radiation field, the heat transfer coefficient of the east wall, the west wall, and the north wall of the local rural residential buildings is 1.13 times, 1.06 times, and 1.14 times of the south wall heat transfer coefficient, respectively. The energy-saving structural wall with KPI porous brick as the main material and the south wall heat transfer coefficient of 0.9 W/(m2·K) is the most suitable energy-saving wall for local rural residential buildings.

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Integrated Life Cycle Energy and Greenhouse Gas Analysis of Exterior Wall Systems for Residential Buildings

Cited by 11 publications

References 19 publications

Implementing Sustainability Criteria for Selecting a Roof Assembly Typology in Medium Span Buildings

Implementing Sustainability Criteria for Selecting a Roof Assembly Typology in Medium Span Buildings

Unsteady Coupled Moisture and Heat Energy Transport through an Exterior Wall Covered with Vegetation

Research on Energy-Saving Design of Rural Building Wall in Qinba Mountains Based on Uniform Radiation Field

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