Damvent Ltd. is a high-tech company and a recognized leader in Bulgaria and the European Union in the development and production of ventilation and air-conditioning systems of the type Hybrid Integrated Solutions for Fresh Air Treatment with Two-Stage Energy Recovery. The company’s production processes are carried out in its own, functionally distinct facilities located on a site covering 18,000 m². Under the current procedure for improving energy efficiency, the company is applying for the installation of a new thermal insulation system on one of its production buildings, which was commissioned under Occupancy Permit No. DK-07-B/02.07.2010. The building has a reinforced-concrete structure with façades made of polyurethane sandwich panels 60 mm thick, which, due to aging, have become compromised—resulting in significant heat losses during winter and heat gains during summer. These thermal characteristics of the external envelope no longer meet modern energy-efficiency requirements. The proposed measures include: • Installation of a second layer of façade sandwich panels with a thickness of ≥ 60 mm, improving the heat-transfer coefficient from K = 0.37 W/m²K to K = 0.185 W/m²K; • Installation of roof insulation using mineral-wool boards with a thickness of ≥ 100 mm, improving the heat-transfer coefficient from K = 0.32 W/m²K to K = 0.16 W/m²K. We consider the application of insulation to the building absolutely essential for achieving a comprehensive improvement in its energy efficiency. The implementation of these measures will result in over 50% improvement in the building’s overall thermal performance, achieving a total heat-transfer coefficient of K = 0.16 W/m²K compared to the current K = 0.32 W/m²K, and will fully comply with the requirements of the EU Energy Performance of Buildings Directive (EPBD), according to which all new public buildings by 2028, and all other buildings by 2030, must be zero-emission.
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