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In recent years, the building sector has been turning towards intervening in the existing city building stock. In fact, it is generally accepted that the refurbishment of buildings and urban regeneration based on sustainability must form the axis of reformulation of the building sector. At present, achieving sustainable urban development inevitably involves improving existing buildings, thereby preventing the need for city growth, and for the emptying of established neighborhoods. Furthermore, considering the whole life cycle, the great amount of greenhouse emissions derived from the construction sector is well known; thus, in order to reach a decarbonized society, it is important to provide eco-efficient construction materials and solutions, adding the principles of the circular economy and resource efficiency. Therefore, the theme of this Special Issue is the “Decarbonization and Circular Economy in the Sustainable Development and Renovation of Buildings and Neighborhoods” in response to the objectives not only raised in the Horizon 2020 but by all the people who seek a more sustainable world. This Special Issue of Sustainability focuses on, but is not limited to: • Obtaining an overview of the environmental problems that arise from construction activity, focusing on refurbishment as an alternative to the current crisis in the construction sector, as well as on actions designed to minimize environmental effects on the environment; • Searching for new alternatives to conventional construction solutions that minimize the environmental impact of the construction activity, improve indoor environmental quality of buildings, build or refurbish, always from a rentable and optimal cost in time, and implement a circular economy and an efficient resource and waste management; • Minimizing the consumption of material resources, energy consumption and CO2 emissions in construction and looking for the proper management of construction and demolition waste and the opportunities for their recycling and reuse; • Sustainable planning and urban development, for an ordered and sustainable growth.

vegetal waste --- shredded corn cobs --- sunflower stalks --- green concrete --- mineral wool --- cement mortar --- recycling --- circular economy --- construction and demolition waste --- CO2 emissions --- disaggregated model --- dust --- noise and vibration emission --- environmental impact studies --- foundations and structures --- sustainability --- transportation --- social housing --- major renovation --- nZEB renovation --- cultural value --- condominium --- cool roof --- energy efficiency --- energy saving --- dynamic numerical method --- life cycle assessment --- disinvestment --- popular housing --- rehabilitation works --- sustainable construction --- waste management --- selective demolition --- waste quantification --- nearly zero-energy building --- End-of-Life Cost --- hospitality --- hotels --- sustainable assessment --- BREEAM methodology --- green hotel --- carbon footprint --- assessment tool --- dwelling construction --- cost control --- direct evaporative cooling --- new pad materials --- wet fabric --- saturation efficiency --- pressure drop --- citizen participation --- resilience --- urban regeneration --- bioclimatic refurbishment --- sustainable city --- Seville --- guide --- decarbonisation --- construction --- Circular Design --- circular technologies --- reversibility --- durability --- circular potential --- indicators --- service life --- closed material loops --- decarbonization of construction sector --- refurbishment of buildings --- neighbourhood regeneration --- eco-efficient construction solutions --- construction and waste management --- indoor environmental quality --- resource efficiency

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The energy transition is one of the key approaches in the effort to halt climate changes, and it has become even more essential in the light of the recent COVID-19 pandemic. Fostering the energy efficiency and the energy independence of the building sector is a focal aim to move towards a decarbonized society. In this context, building physics and building energy systems are fundamental disciplines based on applied physics applications in civil, architectural, and environmental engineering, including technical themes related to the planning of energy and the environment, diagnostic methods, and mitigating techniques. This Special Issue contains information on experimental studies in the following research topics: renewable energy sources, building energy analysis, rational use of energy, heat transmission, heating and cooling systems, thermofluid dynamics, smart energy systems, and energy service management in buildings.

LIDAR point clouds --- 3D urban model --- rooftop modeling --- segmentation --- reconstruction --- 3D building --- setting temperature of hot water --- solar cooling --- absorption chiller --- subcooled compression --- hybrid system --- 3D thermography --- thermal imaging --- laser scanning --- integration methodology --- extrinsic calibration --- decoupled acquisition --- heritage conservation --- green roof --- experimental investigation --- thermal performance --- measurements --- simulations --- India --- BIPV/BAPV --- BIPV-Glazing --- JNNSM --- MNRE --- Zero energy-building --- stolen heat --- energy efficiency --- heat metering --- heat accounting --- dynamic simulation --- social housing --- building simulation --- heat cost allocators --- thermostatic radiator valves --- marine renewables --- remote sensing --- offshore wind --- SWOT(strengths, weaknesses, opportunities and threats) analysis --- greenhouse modeling --- energy demand --- thermal screen --- shading screen --- smart rooftop technologies --- solar energy --- urban heat island --- building codes --- energy policies --- 3D roof city model --- urban landscapes

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Buildings account for more than one-third of the global final energy consumption and CO2 emissions. The building sector offers a significant potential in the transition towards the decarbonisation of societies. To achieve this goal, different concepts and implementations of Net-Zero/Positive Energy Buildings and Districts (NZPEBD) have emerged in the last years and are still in progress. This book is the collection of the articles published in the Special Issue “Net-Zero/Positive Energy Buildings and Districts” of the Buildings journal. This reprint includes 17 research articles covering different aspects of Net-Zero/Positive Energy Buildings and Districts planning, technologies, economics, building design and retrofitting, citizen engagement, and collection of energy data.

energy storage --- hydrogen --- power-to-gas --- reversible solid oxide cell --- optimization --- mixed integer linear programming --- MILP --- microgrid --- PV --- peer to peer --- self-consumption --- energy community --- local market --- PVT --- water-based PVT --- techno-economic analysis --- digital mapping --- seasonal thermal energy storage --- waste incineration --- district heating --- waste heat --- energy retrofit --- heat pump --- CO2 emissions --- building stock --- PED --- energy flexibility --- socioeconomic analysis --- regions --- regulation --- renewable energy --- urban environment --- climatic zones --- gaussian mixture model --- Expectation-Maximization --- urban building energy modeling --- data acquisition --- building optimisation design --- Saharan --- cool climate --- genetic algorithm --- low energy buildings --- spatial --- temporal --- energy use --- smart city --- net‐ and nearly‐zero‐energy buildings --- positive energy communities and districts --- renewable energy integration --- energy flexibility in buildings and communities --- simulation and optimization methods --- practical experience from demo sites --- buildings --- construction --- efficient homes --- energy efficiency --- GHG emissions --- homes --- net-zero energy (NZE) --- NZE building technology --- positive energy districts --- citizen --- cities --- participation --- citizen engagement --- stakeholder engagement --- urban energy transition --- bi-directional grid --- urban photovoltaic systems --- energy communities --- agent based modelling --- techno-economic modelling --- market design --- distributed renewable energy --- characterization --- review --- text mining --- nearly zero-energy building --- container building --- building design --- energy simulation --- climate study --- plus energy buildings --- plus energy districts --- energy sharing --- energy trading --- clean energy package --- n/a