This site is supported by GTZ

Pilot project

In summary:

  • Additional wall insulation
  • Improved windows
  • External shading system
  • Ventilation with heat recovery
  • Solar thermal collectors
  • Heat pumps

Integral energy concept for Danila Sherbakivskogo (Sherbakova) 52

Conducted within the framework of the International Climate Initiative of the German Federal Ministry for Environment, Nature Conservation and Nuclear Safety (BMU), the “Energy Efficient Pilot Project” introduces and supports the implementation of energy efficient and resources saving building concepts in Ukraine. The project focuses on applying energy saving measures to a 20-storied domestic building with the aim to make it an exemplary project.

The building is situated on 52, Danila Sherbakivskogo (Sherbakova) Street, near Kyiv city center. It is a compact object with 21 floors and a gross floor area equal to 51 000 m2 (20 upper floors and one basement floor). The four first floors are used as office and commercial areas. The upper floors 4 to 18 have a residential use with a total of 412 accommodation units. The last two floors host offices.

In comparison to the Ukrainian standards, the project building has a better insulation system with a 12 cm layer of polystyrene (heat conductivity: 0.04 W/(m2.K) externally applied to brick walls and 15 cm to concrete walls. Moreover, unlike Ukrainian construction practice, here balconies have been insulated in order to reduce the heat bridge effect and to prevent mold formation. The energy supply of the building is mainly carried out by the city district heating system.

The 16th floor with a living area of 1800 m2 and 26 apartments has been chosen as exemplary one in matters of building physics and energy technologies. The project is aimed at reducing energy consumption by 50% in comparison with buildings recently constructed in Ukraine.

To achieve prospected results, triple-glazed windows with Argon filling, enlarged frames and enforced insulation were hermetically built-in on the 16th floor. It results in achieving an overall R-value of 1,0 m2.К/W. In order to ensure the protection against overheating in summer, automatically controlled external venetian blinds have been installed. Their position depends on the solar radiation, the inhabitant’s intervention being at any time possible by manual overriding with the help of special push-buttons. The highest priority is given to the protection system against bad weather conditions, which automatically hides the venetian blinds to avoid their damage.

In order to reduce the heat losses related to flat ventilation, decentralized ventilation appliances are integrated into the façade walls. This system is fitted in each room, each of them consisting of a fresh air and an exhaust air fan. A plate heat-exchanger decreases ventilation heat losses thanks to a heat recovery rate of 76%. Apart from energy savings, this system provides a higher comfort, because it prevents draught phenomenon and noise caused by open windows and bad indoor air quality due to insufficient air exchange.

In reason of the high insulation level and reduced heat losses rates, the heating systems in flats have been designed taking into consideration a heat load equal to 33 Watts/m2 and adjusted to a lower heat carrier (equal to 60°C) anew. In contrast to the Ukrainian standard, each radiator is equipped with a thermostatic valve, in order to have an individual monitoring of rooms temperature and fully reach the energy saving potential.

The 16th floor heating system and hot water supply will be provided by its own heating central station on the building roof. This system is carried out by three sources of heat supply, in course of priority: 1) Solarthermal units; 2) Exhaust air heat pumps; 3) District heating as back-up.

The solarthermal system consists of a flat-plate collector array with a total area of 90 m2 located on the roof of the building. Thanks to a solar pump and integrated heat-exchangers, these collectors load three solar accumulators installed in parallel, with a volume of 1.500 liters each. Those ones are linked to a 750 liters buffer tank.

Beside the solar system, 4 air-water heat pumps with a total power of 60 kW also feed this buffer tank. The exhaust air going out from the ventilation shaft of the apartments situated below is used as a partial source. The advantage of exhaust air is its higher temperature in comparison to outside air in winter – less energy is required as input to reach the wished output temperature.

The buffer tank is loaded in by the solar installation and exhaust air heat pumps, meanwhile the solar system has the priority on the heat pumps because sun energy is renewable and local electricity isn’t.

As the outside temperature reaches -22°C (the minimum used for the design), the hot water going out from the buffer tank with a temperature of 60°C is warmed up to 65°C by the backup system and allows the sufficient heating of the 16th floor. The backup system consists of a heat exchanger connected to the transfer station of the district heating and provides enough heat also within low outer temperatures.

Besides the heating system, the buffer tank provides heat for the domestic hot water supply. A second backup system, which is connected to the district heating station near the building, assures sufficient domestic hot water temperatures, even if outside temperature is low and solar radiation is little. The warming up of the domestic hot water is carried out by a flowing and storage system with a volume of 1000 l.

For the purposes of recording the exploitation and optimizing features of the system, a comprehensive measuring and metering concept is implemented hereby. It records all relevant heat production and consumption data, as well as important system temperatures and weather data. Especially in order to prove the efficiency of the insulation measures and the ventilation equipment, the heat consumption of the 26 flats on the 16th floor and similar flats on the 15th floor are being recorded for the further purpose of making comparison. Other important monitored values are the respective contributions of solar energy and heat pumps to the supplied heat. For the calculation of the Coefficient of Performance (COP) of the heat pumps, the electricity demand of the heat pumps and circulation pumps is additionally collected. The calculation of the degree of efficiency of the solar thermal collectors is possible thanks to the measurement by a pyranometer of the solar irradiation on the collector surface.

Due to its integrated approach and application of both efficient and renewable energy technologies, as well as monitoring system, exemplary landmark project “Sherbakova 52” is considered to be unique for Ukraine. This project aims to be a considerable boost for the raise of awareness among professionals and consumers in the sphere of energy efficient buildings in Ukraine and Eastern Europe owing to an available opportunity to inspect equipment at any time as well as to receive all necessary information when visiting corresponding seminars and workshops conducted by GIZ.