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Description
The project is aiming to transform "St. St. Cyril and Methodius” school from a conventional building to a highly efficient building, in which a significant part of the energy is supplied by RES. For this purpose, the implementation of 7 measures are designed, which will allow the building to significantly reduce heat loss through measures on the external enclosing structures. In addition, the replacement of the existing hot water boiler utilizing oil with a highly efficient geothermal installation, consisting of 2 water-to-water heat pump units with a total heating capacity of 360 kW, which will be connected to an external geothermal circuit will be realized. In addition, a PV installation for own needs, a battery energy storage system and a monitoring and management system are envisaged. This will allow over 90% of the energy consumed to be from RES. In this way, the pilot building will reach energy class A +, allowing the building to become a NZEB. The implementation of the project demonstrates and validates an innovative approach for the transformation of conventional buildings into highly efficient ones, which can be replicated by the Municipality and other public buildings. In addition, project management activities, financial audit, construction and author''s supervision, as well as information and publicity are envisaged. The activities and the contribution of the EEA FM to its implementation will be promoted through publicity activities.
Summary of project results
The main objective of the project is to increase energy efficiency by implementing cost-effective energy efficiency measures, which will achieve a significant improvement in the energy performance of the building, as well as its transformation into a building with close to zero consumption. The object of interventions in the current project is the school "St. St. Cyril and Methodius" - the city of Vidin. The school is a monolithic building, consisting of two educational buildings and an administrative block. Since the building was put into operation, no repair work has been carried out on the facade and structure of the building, respectively, there is no thermal insulation laid on them. Heating is carried out with conventional and expensive energy carriers. The school educates 400 students in a two-shift regime and up to 30 staff. It is planned to implement 7 pcs. ESM, through which the building passes into energy class A+ and over 90% of its consumption is from renewable energy. The main objective of the project fully corresponds to the objective of the procedure for implementing appropriate energy efficiency measures, through which the building will meet the conditions of the national definition of a "building with close to zero energy consumption".
1) Thermal insulation of external walls - ECM provides for the installation of external thermal insulation from EPS-F on external walls with a thickness of 10 cm, λ = 0.031 W/mK. On the sides - thermal insulation system of windows - type XPS, δ = 2.0 cm.
2) Thermal insulation on roofs - installation of thermal insulation on the upper part of the attic structure of 12 cm of laminated mineral wool, λn: 0.035, W/mK; installation of graphite thermal insulation plate on the roof structure of a flat roof, EPS 12 cm., λ = 0.030 W/(mK),
3) Replacement of existing metal and wooden doors and windows with PVC with U≤1.4 W/m²K
4) Implementation of a geothermal heat pump installation and HEI using fan convectors - The heat supply of the "St.St. Cyril and Methodius" Secondary School will be carried out by means of 2 pcs. "water-water" heat pump units, with a heating capacity of 160 kW and an electrical capacity of 32 kW/380V. It is planned to connect the primary circuits of the heat pump units to an external geothermal circuit and to implement the so-called "ground-connected geothermal heat pump installation". Closed geothermal sets made of polyethylene pipelines and installed in vertical dry geothermal boreholes will be used to utilize geothermal energy. A total of 40 vertical boreholes are planned, each 100 m deep. Circulation between the geothermal sets and the heat pump units will be carried out with circulation pumps in polyethylene pipelines installed underground, without channels. The geothermal heat pump installation is a modern environmentally friendly technical solution that does not adversely affect the environment. Heating of the premises will be carried out using new fan convectors. The heat carrier supply to the convectors will be provided by a completely new distribution pipe network. The geothermal installation will also be able to be used for cooling the premises during the summer period, and free cooling (so-called "free cooling") will be available for most of the season.
5) LED lighting - it is necessary to redesign the lighting in the building, replacing all incandescent and fluorescent lamps with highly efficient LED energy-saving lighting fixtures and systems.
6) Photovoltaic system for self-consumption - the installation is planned to operate for self-consumption. For this purpose, a 77 kWp PV installation and an energy storage system are planned to be built on the roof of the building, so that unused production can be stored in batteries and the energy can be used during hours without sunlight.
7) Monitoring system - The energy-saving measure provides for the construction of an automation and energy management and monitoring system. The following are planned: control of fan convectors with a seven-day programmer; programmable room thermostats; controller for controlling a heat pump.
The improved energy effieciency affected 503,5 people (242 man and 261,5 women); The reduction of the energy consumption is reported as 1 059,36 MWh/y; the implementation of the project led to 1250 tCO2 reduction annualy.
Summary of bilateral results
Improved bilateral cooperation with interested stakeholders in the field of energy efficiency to present good practices and future development of the city and the municipality in this regard.