RES Technology Transfer Centre in Konstantynów Łódzki
nZEB Example

The building uses all forms of renewable energy sources available in Central Poland: solar energy (both for heating and electricity generation), biomass, wind, and underground heat.

The load-bearing elements of the building are:
▪ foundation: monolithic reinforced concrete slab 30cm made of tight concrete on periporous blocks 35cm thick, with perimeter thermal insulation
▪ external construction walls made of silicate blocks insulated with a 35 cm layer of mineral wool.
▪ internal construction walls made of silicate blocks (class 20 MPa)
▪ ceiling made of prefabricated, prestressed concrete slabs, 20 cm high, with rims on the edges;
▪ partition walls made of silicate blocks
The building façade includes aluminium windows and external doors, meeting the requirements for the frame and glazing U <0.80 W / m2K, with solar radiation energy transmittance for glazing g> 50%. The building is equipped with mechanical supply and exhaust ventilation based on heat recovery units. Ventilation also acts as air heating. There are two groups of rooms in the building: research laboratories and office/training rooms. Separate air handling units were designed for each group of rooms.
The building is equipped with three heat sources:
▪ a ground-air heat exchanger – is responsible for initial heating of the ventilation air, and in summer it is used for passive cooling of the building
▪ three reversible air-to-air heat pumps – proper heating or cooling of the ventilation air
▪ a biomass boiler with a capacity of 22 kW – peak source, used for heating and domestic hot water preparation.
The domestic hot water preparation system is a bivalent system. The main sources are solar collectors: vacuum and flat collectors (4 pcs), operating in separate circuits, periodically supported by a biomass boiler.
Electricity to power the building comes from the power grid, a micro-wind turbine (500W), and an on-grid photovoltaic installation with a capacity of 30 kW. The building is integrated with a BMS and an electric vehicle charging station.

Building owner

Research and Innovation Centre Pro-Akademia

Building type
Project type
Year of construction / major renovation

Construction: 2015
Major renovation: N/A

Total floor area
498.73 m²
Construction U-value

External Walls

0.11 W/m²K


0.08 W/m²K

Floor on the ground

0.06 W/m²K
Windows Uw Uf Ug G

External Windows

0.80 W/m²K N/A N/A N/A
nZEB Parameters

Primary energy consumption: -12 kWh/m2 (plus-energy building)

Building part / RES Technology Transfer Centre / National requirements for nZEB in force since 01/01/2021
External walls / 0.11 / 0.20
Roof / 0.08 / 0.15
Floor on the ground / 0.06 / 0.30
Windows / 0.80 / 0.90

Source: Jaczewski, M. and Firląg, S., 2014. Charakterystyka budynku Centrum Transferu Technologii w obszarze OZE w kontekście wymagań dla standardu pasywnego. Acta Innovations, (13), pp.32-40.


The building hosts training for two target groups of nZEB market: PV installers (training accredited by the Polish Technical Inspection Office – UDT) and students of technical high schools, specialising in RES systems.

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