The aim of the project is to develop and test a new construction of unglazed photovoltaic-thermal (PVT) collector suitable for mounting on large facades, based on previous research on solar cogeneration (simultaneous heat and power generation). The new PVT collector design will be lighter and of the same strength compared to conventional products on the market, while the new collector design will be modified to maximise thermal and cooling performance (protected by a utility model). The collectors will be designed as part of a standardised prefabricated structural system by an industrial participant in the project. During 2025, the optimised designs of the unglazed PVT collectors will be demonstrated in a real environment at the partner's façade and connected to the existing energy system.