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Throughout prehistory, earthen architecture has played a pivotal role in establishing a sustainable and easily maintainable built environment, showcasing humanity's capacity to design and construct intricate structures using eco-friendly and cost-effective materials. This special issue underscores the enduring significance of earthen architecture in our historical and contemporary understanding of sustainable building practices.

The need for affordable housing requires more compact living. With the increasing frequency and impact of climate change incidents, a new way of thinking is needed to live in a more resilient and climate responsive way. The idea of a Z free home began by considering these two needs. As a tiny mobile house equipped with passive and eco-cycle systems, it achieves 9 zero targets. This paper evaluates the design concept, building modelling, and building simulation for the Z free home design. The project is ongoing and aims to model a full physical prototype as a proof of concept for the 9 zero targets in an urban living lab context in Lund Sweden.

In recent years, the need for affordable sustainable housing has increased. At the same time, there has been a gradual rising interest in compact living. With the mounting impacts of climate change, a new way of thinking is needed to develop more resilient and climate responsive ways of living that are compact, affordable, and climate-conscious. In response to this need, the idea of a 'Z-Free Home' was born. The 'Z-Free Home' is a tiny mobile house equipped with essential passive and eco-cycle systems that achieves nine zero targets. The main design and construction concept is based on circular design and a return to nature life cycle principles. In this paper, the architectural design concept, building energy modelling, and simulation for the Z-Free Home design proposal is discussed. This paper describes the concept design and design development phases together with building modelling and simulation. A focus was made on the use of virtual reality in design development assessment as a new method for evaluating passive and eco-cycle systems. The results show that it's possible to achieve nine different zero goals while the analysis illustrates the challenges in achieving them. The paper also described the next steps planned for the proof of concept, i.e., the 1:1 house model. The project is ongoing, and it aims at a full-scale physical prototype as a proof of concept for the zero targets. The 'Z-Free Home' is designed for the cold Swedish climate but could be more widely applicable in other mild climates as well as hot climates. [ABSTRACT FROM AUTHOR]

In hot dry regions, the building envelope receives abundant solar radiation, which contributes to heat stress and indoor thermal discomfort. To mitigate overheating inside spaces, cooling is the main basic requirement during most of the year. However, due to the harsh climatic conditions, buildings fail to provide passively the required comfort conditions. Consequently, they are fully dependent on-air conditioning systems, which are huge energy consumers. As roofs are exposed to the sun throughout the daytime, they are estimated to be the main source of heat stress. In return, they can contribute significantly to achieve optimum comfort and energy savings when efficient design strategies are used in an early design stage. To examine the potential for cooling load reduction and thermal comfort enhancement by using cooling roof techniques in residential buildings, a study was performed in the city of Biskra (southern Algeria). Accordingly, an in-field measurement campaign was carried out on test-cells during five days in summer. Three different cooling roof techniques were addressed: (a) cool reflective white paint (CR), (b) white ceramic tiles (CT) and (c) a cool-ventilated roof (C-VR). These roofing alternatives were investigated by monitoring both roof surface temperatures and indoor temperatures. Comparative analysis showed that a cool-ventilated roof is the most efficient solution, reducing the average indoor temperature by 4.95 °C. A dynamic simulation study was also performed based on TRNSYS software to determine the best roofing system alternatives in terms of thermal comfort and energy consumption, considering the hottest month of the year. Simulation tests were run on a base-case model representing the common individual residential buildings in Biskra. Results showed that a double-skin roof combined with cool-reflective paint is the most efficient roofing solution. By comparison to a conventional flat roof, meaningful improvements have been achieved, including reducing thermal discomfort hours by 45.29% and lowering cooling loads from 1121.91 kWh to 741.09 kWh. [ABSTRACT FROM AUTHOR]

In hot dry climates, employing passive cooling roofs systems can provide cooling needs with less amount of electrical energy. Furthermore, when focusing on living spaces in terms of indoor thermal comfort and energy performance issues, occupant’s interaction with the building should not be underestimated. Recent studies with occupant-based focus have shown that human behaviour significantly impacts energy consumption, even more than building design. Likewise, understanding occupant’s interactions within buildings plays a key role in enhancing the indoor environment performance. To examine the potential for cooling load reduction and thermal comfort enhancement by using cool roofs in residential buildings, a study was performed. Considering a sample of twelve multi-story houses located in the city of Biskra (southern Algeria), thermal comfort conditions were analysed on the basis of a post-occupancy evaluation (POE) survey and in situ recorded measurements campaign. The POE household survey indicated that out of 43 respondents, 54% perceive indoor thermal conditions as “hot” during summer period, while 79.33% of them operate HVAC device day and night. Using interviews, the study also explores social acceptability toward implementing passive roofing techniques. Results showed that cool roof and cool tiles were the best accepted systems with 100% and 90% voted strongly agree. Furthermore, the potential of thermal comfort and energy-efficiency improvements due to cool roofs was investigated through a dynamic simulation using TRNSYS software. Results indicated that air temperature was reduced by an average of 4.11°C to 3.28°C, and cooling loads have decreased to 508.60kWh/m² and 384.54kWh/m² respectively during the hottest period of summer. Therefore, usercentric satisfaction as a research method would enhance future buildings design. [ABSTRACT FROM AUTHOR]

Post-conflict reconstruction is a major topic in war-torn cities in the Middle East and North Africa region. Rather than being limited to re-establishing pre-conflict conditions, new formats of urban settings may be adopted, both for the design and quality of urban space, as well as for the design and building process. This article proposes a combined top-down and bottom-up design approach, supported by parametric urban design modelling. As sustainable (re-)development of the urban-scape requires coordination across different scales, a top-down approach is partly needed for reasons of coordination. As participatory design processes involving local stakeholders work from the partial to the whole, a bottom-up approach is partly needed for reasons of inclusion. By means of a parametric urban model combining both overview and detail, the two approaches can be combined. This article shows the theoretical framework and, by way of example, applies the model to Fallujah in Iraq as a case study. [ABSTRACT FROM AUTHOR]

Vernacular architecture is suffering all over the world and Egypt is one of the countries where the desert vernacular is facing a great risk of disappearance. The aim of the research is to introduce a methodological approach applying participatory action research (PAR) as a tool to help save the future of the currently deteriorating desert vernacular architecture. The aim was to help prevent further loss of desert vernacular architecture knowledge and to encourage vernacular know-how in becoming a living part of future building practices. To benefit from local know-how, a desert vernacular model house was constructed using PAR methods that engaged the local community throughout the design and building phases. The model house was constructed based on an understanding of desert vernacular architecture as well as of the urban fabric and building technology. The town of Balat in the Western Desert of Egypt was chosen as a location for this research work application. As this is an international problem the research developed several techniques within PAR, applied in a flexible way, giving the opportunity for further application in similar vernacular settlements suffering from similar problems. [ABSTRACT FROM AUTHOR]

The mounting climate change crisis and the rapid urbanization of cities have pressured many practitioners, policymakers, and even private investors to develop new policies, processes, and methods for achieving more sustainable construction methods. Buildings are considered to be among the main contributors to harmful environmental impacts, resource consumption, and waste generation. The concept of a circular economy (CE), also referred to as "circularity", has gained a great deal of popularity in recent years. CE, in the context of the building industry, is based on the concept of sustainable construction, which calls for reducing negative environmental impacts while providing a healthier indoor environment and closing material loops. Both vernacular architecture design strategies and circular economy principles share many of the same core concepts. This paper aims at investigating circular economy principles in relation to vernacular architecture principles in the built environment. The study demonstrates how circular principles can be achieved through the use of vernacular construction techniques and using local building materials. This paper will focus on Egypt as one of the oldest civilizations in the world, with a wide vernacular heritage, exploring how circularity is rooted in old vernacular settlements and how it can inspire contemporary circular practices. [ABSTRACT FROM AUTHOR]