Passive strategies used in Southern Portugal vernacular rammed earth buildings and their influence in thermal performance

Fernandes, Jorge Emanuel Pereira; Mateus, Ricardo; Gervásio, Helena; Silva, Sandra Monteiro; Bragança, L.

doi:10.1016/j.renene.2019.04.098

Cited by 68 publications

(41 citation statements)

References 27 publications

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“…The soil in this region has low clay content, so shrinkage during the drying process is relatively low; on the contrary, it favors the water permeability of the walls and roofs, which will require auxiliary waterproofing [35]. The nature of the wall, with a thickness varying between 45 cm and 90 cm, allows its adaptation to the climate and provides it with adequate thermal inertia [36].…”

Section: Materials and Construction Techniquesmentioning

confidence: 99%

Tradition and Sustainability in Vernacular Architecture of Southeast Morocco

Piqueras

Navarro

2021

Sustainability

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This article is presented after ten years of research on the earthen architecture of southeastern Morocco, more specifically that of the natural axis connecting the cities of Midelt and Er-Rachidia, located North and South of the Moroccan northern High Atlas. The typology studied is called ksar (ksour, pl.). Throughout various research projects, we have been able to explore this territory, documenting in field sheets the characteristics of a total of 30 ksour in the Outat valley, 20 in the mountain range and 53 in the Mdagra oasis. The objective of the present work is to analyze, through qualitative and quantitative data, the main characteristics of this vernacular architecture as a perfect example of an environmentally respectful habitat, obtaining concrete data on its traditional character and its sustainability. The methodology followed is based on case studies and, as a result, we have obtained a typological classification of the ksour of this region and their relationship with the territory, as well as the social, functional, defensive, productive, and building characteristics that define them. Knowing and puttin in value this vernacular heritage is the first step towards protecting it and to show our commitment to future generations.

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Section: Materials and Construction Techniquesmentioning

confidence: 99%

Tradition and Sustainability in Vernacular Architecture of Southeast Morocco

Piqueras

Navarro

2021

Sustainability

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“…The decrement factor or amplitude decrement is often expressed by Eq. (1) where the outdoor temperature amplitude is compared with the indoor temperature amplitude highlighting the potential of improving both indoor thermal comfort and their reduction of the use of HVAC systems, hence improving the building energy efficiency [19,[27][28][29][30][31].…”

Section: Building Thermal/energy-efficiencymentioning

confidence: 99%

Thermal inertia as an integrative parameter for building performance

Soret

Vacca

Tignard

et al. 2021

Journal of Building Engineering

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Traditionally, the energy efficiency properties of building envelope components are prescribed world-wide using the steady-state "U-value" where the insulation capabilities rely on the thermal conductivity of construction materials only. However, the heat flow through the building envelope is also restricted by the effect of other material properties combined in the form of the thermal inertia, a widely used parameter that can be controlled in the building environment through transient-state parameters such as the cyclic transmittance "u-value". By controlling the thermal inertia of the building envelope components key aspects of the building performance such as the building thermal, energy efficiency and fire performance can be evaluated in a holistic manner so that balanced design solutions are obtained without detriment affecting each other. Herein, it is proposed a holistic assessment method that uses a numerical model to obtain the thermal inertia of building components from their thermal insulating parameters to ultimately predict reaction-to-fire performance. The method includes a complementary thermal test to achieve reliable and realistic assessments that enable the analysis of aspects like the effect of construction imperfections. Two wall assemblies were built first to illustrate the method including the thermal test and finally to verify the method by conducting reaction-to-fire tests.

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“…The study of Portuguese vernacular architecture based on in situ measurements that allow a comprehensive demonstration of the effects of vernacular passive strategies on thermal performance is still lacking. In Portugal, there are only a few quantitative studies [25][26][27][28] focusing on passive strategies and their contribution to the thermal performance of buildings.…”

Section: Aim Of This Researchmentioning

confidence: 99%

Thermal Performance and Comfort Condition Analysis in a Vernacular Building with a Glazed Balcony

et al. 2020

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The increase in global environmental problems requires more environmentally efficient construction. Vernacular passive strategies can play an important role in helping reducing energy use and CO2 emissions related to buildings. This paper studies the use of glazed balconies in the North of Portugal as a strategy to capture solar gains and reduce heat losses. The purpose is understanding thermal performance and comfort conditions provided by this passive heating strategy. The methodology includes objective (short and long-term monitoring), to evaluate the different parameters affecting thermal comfort and air quality, and subjective assessments to assess occupants’ perception regarding thermal sensation. The results show that the use of glazed balconies as a passive heating strategy in a climate with cold winters is viable. During the mid-seasons, the rooms with balcony have adequate comfort conditions. In the heating season, it is possible to achieve comfort conditions in sunny days while in the cooling season there is a risk of overheating. Regarding indoor air quality, carbon dioxide concentrations were low, but the average radon concentration measured was high when the building was unoccupied, rapidly decreasing to acceptable values, during occupation periods when a minimum ventilation rate was promoted. Occupants’ actions were essential to improving building behavior.

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Passive strategies used in Southern Portugal vernacular rammed earth buildings and their influence in thermal performance

Cited by 68 publications

References 27 publications

Tradition and Sustainability in Vernacular Architecture of Southeast Morocco

Tradition and Sustainability in Vernacular Architecture of Southeast Morocco

Thermal inertia as an integrative parameter for building performance

Thermal Performance and Comfort Condition Analysis in a Vernacular Building with a Glazed Balcony

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