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Climate-responsive strategies of vernacular architecture in Albania and Portugal

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Abstract

The influence of climate on vernacular architecture is widely recognised. In the case of the Mediterranean Sea, its influence on climate ranges a wide variety of territories and cultures. Therefore, it is relevant to study how the climatic factor has modelled vernacular architecture in those territories and if there are common features. In this exploratory study are qualitatively compared the climate-responsive strategies of vernacular architecture from two countries located on opposite sides of the Mediterranean basin, namely, Portugal and Albania. The pragmatism of these strategies, developed on the need of adaptation to a specific climate and territory, may con-tribute to reduce energy consumption and waste. The study allowed showing points of similarity between strategies used in the two countries and, understanding how these strategies influence indoor comfort conditions. The results of the study can be used to develop and integrate these strategies in the current construction context, contributing to its sustainability.
1 INTRODUCTION
The climate is undoubtedly one of the geographical constraints with more influence on
buildings, at several levels. In this scope, vernacular architectural is a good example on the
diversity of strategies to overcome climatic constraints, as synthesised bySupic (1982).To suit
climatic conditions, vernacular architecture developed specific mitigation/adaptation strategies.
In this type of architecture, closely related to local conditions, it is possible to see that
architectural form and climate-responsive strategies vary from region to region. Nevertheless, it
is also possible to see similarities between vernacular buildings from distant origins. In several
cases, these similarities are in vernacular buildings from regions with the same type of climate.
The case of the Mediterranean basin is an interesting subject since it is a wide area with a
large variety of territories and cultures under the influence of the same climate. Therefore, it is
relevant to study how the climatic factor has modelled vernacular architecture in those
territories and if there are common features. Therefore, conceived in a low-tech context,
vernacular architecture developed ingenious passive strategies to mitigate the effects of climate
and assure the best comfort conditions possible.In a recent past, as a result of standardisation of
buildings, vernacular knowledge was forgottenand mechanical active systems started to be
routinely installed and operated, even if not necessary (Healy, 2008). Moreover, the use of these
systems led to a condition of thermal monotony that was delineated and maintained based on
norms of thermal comfort that configure standardized and homogenous “comfort zones”, that
are now contested due to its energy-intensity (Healy 2008),.Relying on these systems, the
Climate-responsive strategies of vernacular architecture in
Albania and Portugal
J. Fernandes & R. Mateus
CTAC Research Centre, University of Minho, Guimarães, Portugal
E. Dobjani
Polis University, Tirana, Albania
H. Gervásio
ISISE Research Centre, University of Coimbra, Coimbra, Portugal
ABSTRACT: The influence of climate on vernacular architecture is widely recognised. In the
case of the Mediterranean Sea, its influence on climate ranges a wide variety of territories and
cultures. Therefore, it is relevant to study how the climatic factor has modelled vernacular
architecture in those territories and if there are common features. In this exploratory study are
qualitatively compared the climate-responsive strategies of vernacular architecture from two
countries located on opposite sides of the Mediterranean basin, namely, Portugal and Albania. The
pragmatism of these strategies, developed on the need of adaptation to a specific climate and
territory, may contribute to reduce energy consumption and waste. The study allowed showing
points of similarity between strategies used in the two countries and, understanding how these
strategies influence indoor comfort conditions. The results of the study can be used to develop and
integrate these strategies in the current construction context, contributing to its sustainability.
Chapter 9: Earthen buildings
1217
majority of modern buildings does not show any particular concern about the relation with the
surrounding environment, which is reflected in more energy consumption and consequent
environmental impacts. Therefore, there is a need to learn and import climate-specific know-how
from vernacular passive building technologies into our contemporary climatic responsive building
practice.
Thus, the study of climate-responsive vernacular strategies is important nowadays to
understand how they can contribute both to minimize energy consumption and guarantee
thermal comfort and which are the common strategies for the same type of climate.In this
context, several studies conducted in territories under the Mediterranean climate have revealed
the good thermal performance of these vernacular buildings (Fernandes and Silva, 2007, Martín
et al., 2010, Cardinale et al., 2013, Philokyprou et al., 2017). So, there is potential to integrate
this kind of strategies in contemporary passive building design.
In this sense, this paper presents anexploratory study where are qualitatively compared the
climate-responsive strategies of vernacular architecture, and how these strategies are perceived
to influence indoor comfort, from twoMediterranean countries distant from each other, namely,
Portugal and Albania.
2 METHODOLOGY
In this exploratory study, is applied a qualitative analysis and comparisononthe climate-
responsive strategies used in Mediterranean vernacular architecture from Albania and Portugal.
The application was on cases/examples from southern part of Portugal and the central part of
Albania, both in urban and rural dwellings. The aim is to understand points of similarity and
difference between the strategies used in both countries. The results will allow to
comprehensively understand if there is a correlation between the type of climate and the
strategies used in vernacular architecture.
3 CHARACTERIZATION OF THE MEDITERRANEAN CLIMATE IN SOUTHERN
PORTUGAL AND CENTRAL ALBANIA
The Mediterranean climate is a type of temperate climate mainly from the regions in the
Mediterranean Basin, but it also can be found in other parts of the world. In the case of Albania
and Portugal, they have a temperate climate Type C, according to Köppen-Geigger climate
classification (AEMET and IM, 2011, Climate-Data, 2017, WeatherOnline, 2017), and in this
paper the focus is in the regions with a climate sub-type Csa (temperate with hot and dry
summer) (Fig. 1).
In the case of Albania, the territory is divided in the coastal lowlands, in the west part, and
the highlands especially in the east, north and south part. The Riviera costal part has a typically
Mediterranean climate and from north to south temperature decreases around 5ºC.In the coldest
month daily temperature varies between 18°C and -3°C and in the warmest month temperature
is above 22°C. The annual average rainfall is around 1000-1500 mm in lowlands and about
1800-2550 mm in some northern areas(WeatherOnline, 2017).
In Portugal,the mainland territory isdivided into two sub-types of climate: i) most of the
northern part and west coast have a climate sub-type Csb (rainy winters and dry or temperate
summerssub-type); ii) the southern parthas a climate sub-type Csa (temperate with hot and dry
summer). In the southern part, summer is the harsh season. The mean values for maximum air
temperature vary between 32-25°C, reaching sometimes maximum temperatures of 40ºC or
45ºC, being July and August the hottest months (AEMET and IM, 2011). The annual average
rainfall is below 500mm, being July the driest month (below 5mm) (AEMET and IM, 2011).
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Figure 1. Portugal and Albania climate map (adapted from (Peel et al., 2007)).
4 VERNACULAR CLIMATE-RESPONSIVE STRATEGIES
In the past, when energy was not readily available and active systems did not exist, builders had
to experiment and develop passive ingenious systems that optimize indoor comfort and respond
to particular human needs and climatic conditions through the available resources (Turan, 1990,
Oliver, 1998, Fernandes and Mateus, 2012, Jones and Nichols, 2012). In this section are
presented and comparedclimate-responsive vernacular strategies used in both countries with the
same purpose. The use of patios, vegetation, heavy mass walls and light colours, are common
passive strategies. Some of these strategies are discussed below.
4.1 Urban layout and buildings orientation
The use of a compact urban layout is common in regions with hot summer periods (Fig. 2). This
layout is more adequate than modern orthogonal and wide grid street planning, sincethe
compact urban fabric provides more shade between buildings. Thus, it minimises heat gains in
summer and reduces internal heat lossesin winter. At street level, narrow streets and covered
galleries provide shade and protect pedestrians from harsh summer periods (Fig. 3) (Koch-
Nielsen, 2002).In the case of the narrow streets, they function as "urban-patios", storing cool air
during the night and allowing thatduring the morning the walls and pavements of these streets
remain colder than ambient air(Fernandes, Mateus, et al., 2015).
Regarding sun exposure and orientation, buildings seek the south quadrant to maximize solar
gains in winter and to reduce them during summer. The façades facing the south-quadrant
facing façades are the most common to receive less radiation during summer and more in
winter. At the same time, east and west facing façades have less area exposed to minimise direct
heat gains, and the rear façade (without or only with a few openings) is oriented to the
prevailing winds.
Fi
g
ure 2. Compact urban la
y
out. (left) Évora, Portu
g
al; (ri
g
ht) Tirana, Albania.
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Figure 3. (left) Narrow street,(center) covered gallery (urban), Portugal; (right) covered gallery (building
of MuzeuEtno
g
rafik, Kava
j
e), Albania.
4.2 Patios, waterand vegetation
At the scale of buildings, due to their advantages the use of patios and vegetation is frequent.
In what thepatiosis concerned, these are a passive cooling strategy that is intrinsically related
to the presence of Roman and Arab cultures in both countries. This feature allows minimising
sun-exposed surfaces, maximising shade and ventilation and also natural light and ventilation
for indoor spaces.The presence of vegetation and water elements is frequent (Fig. 4). Their
presence has a positive influence on the microclimate around buildings. An experiment
conducted in southern Portugal during summer showed that air temperature in the patio always
remained lower than those recorded for the city centre, with a maximum difference of around
9ºC during daytime (Fernandes, Mateus, et al., 2015). This is due to the effect of
evapotranspiration and shade from plants and evaporative cooling of water. The use of
vegetation is useful to provide shade and to increase air moisture via evapotranspiration process,
helping to cool the air streams before entering the building.Since a green ground absorbsonly
10% of radiation,it also allows reducing the heat island effect (Koch-Nielsen, 2002). The
presence of water elements, as fountains or wells, serve to cool the air by evaporation
(evaporative cooling).
Fi
ure 4. Patios containin
g
ve
g
etation and water elements. (left) Portu
g
al; (ri
g
ht) Albania.
4.3 Natural ventilation and shading
The promotion of natural ventilation for overnight cooling is an important passive strategy in a
hot climate. It was possible to found several ways to foster natural ventilation that were
integrated into windows and doors or in walls. Taking advantage of night cooler air, the
promotion of air circulation inside the building by stack effect allows removing diurnal thermal
loads and increasing thermal comfort.The ventilation openings that use grids allow
simultaneously ventilation and shading from intense light and radiation without compromising
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privacy and security(Fernandes et al., 2014). The use of wood in window frames and shutter
works as thermal insulation, retarding undesirable heat gains by these building elements (Fig.
5). In some cases, originally window systems functioned without glass.
The use of vegetation as shading as multiple applications, not only shading the ground but
also applied as pergolas and as a shading screens for façades (Fig. 6).
Figure 5. Shutters and ventilation grids. (left) Portugal; (right) Albania.
Fi
ure 6. Use of ve
g
etation for shadin
g
. (left, center) Portu
g
al; (ri
g
ht) Albania.
4.4 Building envelope, materials and colours
The building’s envelope isthe shell and the major area of contact to outer environment. Thus, its
thermal performance has great influence on indoor environment. In a climate with hot
summers,the envelope has to deal with intense solar radiation and mitigate its effects on indoor
comfort. Some mitigation strategies pass by: i) reducing the size of windows-openings,
retreating them into the façade to get more shade (Fig. 7); ii) the use of light colours; iii) and
heavy thermal mass materials to dampen the heat flux.
The type of colour that is used on façades has influence on indoor temperature (Givoni,
1994). The traditional whitewashed surfaces (facades, terraces and floors) (Fig. 8)are an
important element to mitigate solar radiation, allowing a reflectance of about 90% of all the
radiation received (Koch-Nielsen, 2002).
Figure 7. Small openings. (left; center) Portugal; (right) Albania.
Chapter 9: Earthen buildings
1221
Fi
g
ure 8. Use of li
g
ht colours. (left) Portu
g
al; (ri
g
ht) Albania).
Regarding materials, the main building materials in the regions under analysis are rammed
earth and adobe blocks. The greatest number of adobe constructions in Albania belong to the
Ottoman period. Its implementation is present especially in the center part of Albania, both in
urban and rural dwellings. These buildings are scattered in Tirana, Elbasan, Kavaja, Peqin,
Lushnje, etc. A small presence can be found also in Kucove, Peshkopi. In Portugal, the southern
part of the country is dominated by the presence of rammed-earth buildings.
The high mass that characterizes this type of building systems allows them to respond
appropriately to the summer heat, stabilizing indoor temperature and moisture, as shown by
several studies (Martín et al., 2010, Fernandes, Pimenta, et al., 2015). In the case of Portugal,
the envelope and internal partitions have a heavy thermal inertia (e.g., thick rammed earth walls,
vaulted ceilings) (Fig. 9). During the day,the building systems accumulate heat and delay the
heat flux, allowing that the indoor temperature remain cooler that outside. During the night,they
release the accumulated heat,both indoors and outdoors, being necessary to remove internal
loads promoting overnight ventilation cooling.The hygroscopic inertia of these buildings systems
have the capacity to regulate air humidity (Berge, 2009), i.e., absorbing when moisture is excessive and
releasing it when the air is too dry.Thus, it is possible to stabilize moisture by passive means within
40-60% —the most appropriate range for human health and comfort (Morton, 2008), as shown by
Fernandes et al.(2015).The plaster used in these buildings are mainly made of lime or mud
whitewashed.Another advantage of using these materials is that they have low embodied energy
and can be easily recycled (Fernandes et al., 2013, 2014).In the case of the adobe buildings in
Albania, but similar for Portugal, the foundations for the walls are made of river stones (Fig. 9), up to
the main entrance level, usually 10 or 20 cm up to the sidewalks or the court level, in order to protect the
walls from the rain water and to not let also the water from outside to enter inside (Muka, 2001, 2007).
Figure 9. Heavy mass materials. (left) rammed-earth wall, Portugal; (center) Vaulted ceiling, Portugal;
(right) stone foundation for adobe wall, Albania(image source (Muka, 2007)).
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5 CONCLUSIONS
Despite the distance between Portugal and Albania, it was possible to find commonalities
regarding passive vernacular strategies used in both countries. They are mainly due to the
influence of Mediterranean climate, but it also can be affirmed that there is a common influence
from Roman and Arab cultures. The strategies used in the two regions show similarities.From
the examples presented in this paper, these strategies are more oriented to a passive cooling purpose,
where a climate with hot dry summers is not a coincidence.
Taking into consideration previous studies on the thermal performance of vernacular
architecture within the Mediterranean climate, the strategies presented in this paper are effective
in achieving indoor comfort conditions by passive means alone. Thus, this indicates that they
still are effective nowadays. The challenge now is to adapt them to new contemporary buildings
and, at the same time, comply to current buildings’ thermal legislation.Nevertheless, with the
optimisation of these strategies it will be possible to reduce waste and energy consumption for
acclimatisation. The simplicity and pragmatism that characterise these passive strategies can
contribute to reduce the dependence on mechanical system to achieve comfort conditions and
thus on fossil energy. So, there is a need that construction professionals relearn from low-tech
and low-energy vernacular passive strategies. However, an integration between tradition and
contemporaneity, using the best of both in technologies and materials, must be seeked. It is up
to designers to use their creativity to improve and adapt these techniques to new functional
building requirements.
Therefore, this is an on-going research work and further research work is needed to
understand the feasibility and adaptation to modern buildings, namely, systematised quantitative
studies and surveys. More detailed and comprehensive data on vernacular strategies would be
useful to develop guides on climate-responsive and energy-efficient buildings.
ACKNOWLEDGMENTS
The authors would like to acknowledge the support granted by the Portuguese Foundation for Science and
Technology (FCT) in the scope of the Doctoral Program Eco-Construction and Rehabilitation that
supports the PhD scholarship with the reference PD/BD/113641/2015, that was fundamental for the
development of this study.
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