More and more cities are evolving into smart cities, increasing their attractiveness, energy efficiency, and users’ satisfaction. Lighting systems play an important role in the evolution process, thanks to their ability to affect city life at night along with people’s mood and behaviour. In this scenario, advanced lighting design methods such as virtual reality (VR) became essential to assess lighting systems from different points of view, especially those linked with the city users’ expectations. Initially, the review highlights a list of objective and subjective parameters to be considered for the lighting design of three main city areas/applications: roads, green areas and buildings. Besides, the state-of-art in using VR for outdoor lighting design is established. Finally, the Unreal game engine is used to analyse the ability of VR to take into account the lighting parameters, not yet investigated in current literature and to highlight the VR potential for augmenting lighting design. The results confirm the benefit of using VR in lighting design, even if further investigations are needed to establish its reliability, especially from the photometrical point of view.

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A large amount of the Iranian energy demand is related to the building sector, mainly due to its obsolescence. In this paper, a second-skin system has been implemented as a retrofit action for an office building, evaluating the effect of a tensile material as second-skin in terms of primary energy saving, carbon dioxide equivalent emissions, and simple payback period. The analysis was carried out through numerical simulations across a whole year and for four Iranian cities (Tabriz, Teheran, Yazd, and Bandar Abbas) in four different climates (cold, temperate, hot-dry, and hot-wet), and with the building aligned at either north-south or east-west. Moreover, an economic analysis was carried out suggesting different incentive policies to promote building energy refurbishment. The simulation results highlighted a favorable orientation for buildings in Iran, suggesting a guideline for new constructions. Indeed, the best results were achieved for an east-west orientation of the building (up to a primary energy saving of 13.6% and reduction of carbon dioxide equivalent emissions of 45.5 MgCO2,eq, in Yazd), with a decrease of the annual specific total (cooling and thermal) energy demand of 37.9 kWh/m2/year. The simple payback period values were also lower in the east-west orientation than the north-south one.

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Christian church buildings constitute most of the architectural heritage in Italy. In this paper, the case study of the exterior lighting renewal of the Church of “Santa Maria di Piedigrotta”, located in Napoli, is discussed. The lighting project was carried out with the goal of emphasizing the original hierarchies of the building details, that can often be difficult to understand with the current lighting system. The study started with the analysis of the architectural features of the façades and belfry as well as the existing lighting system. In order to allow for the comparison and optimization of the various lighting design solutions, a virtual model of the church was realized in the simulation software DIALuxEvo. In the most suitable concept, both diffused and accent lighting were integrated, allowing for a correct perception of the whole of the façades of Church, thus highlighting its most valuable elements. The results obtained have responded positively to the enhancement and conservation of the historical-artistic works, while also resulting in energy saving. Moreover, the Standards of Law restrictions on “light pollution towards the sky” for historical and monumental buildings have been respected.