Energy-saving potential of TPV glass integrated into existing and heritage buildings: a case study comparing a typical climate series and an extreme year.

Abstract

Given the urgency of decarbonizing the construction sector and the challenge faced by the built heritage in urban environments and the pressing need to enhance thermal resilience, the integration of renewable energy systems such as photovoltaics can be particularly challenging due to specific restrictions aimed at preserving the aesthetic and architectural value of the heritage buildings. In this context, the integration of transparent photovoltaic glass (TPV) in architectural design can enhance the energy generation capacity of existing buildings. This approach offers a solution that minimizes alterations to the aesthetic appearance of façades and roof, making particularly suitable for heritage buildings. Additionally, it is justified by the necessity of glazing replacement to improve the energy performace of built heritage in use. This particular case study explores the potential of TPV glazing implementation in an existing and listed educational building located in an urban environment in a temperate climate (Cfb) with the goal of maximizing its electricity generation potential and level of self-sufficiency. The study compares the energy performance of the refurbished building using high performance-glazing and TPV technologies currently available on the market, in combination with passive strategies (solar protections and night cooling ventilation), given that the rooftop PV installations are prohibited by heritage conservation regulations of the region. The results evaluate annual energy performance by distinguishing between summer and winter condition, and compares a typical climate year with an extreme year characterized by heatwave events (2022). The analysis addresses the advantages and limitations of TPV implementation in the context of decarbonizing and thermal resilience of listed buildings.