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Basic school, Voděrady

Client: The Voděrady municipality

An energy audit was performed for the determination of the austerity measures so that the value of energy and financial flows can be determined as well as the specification of energy and financial cost resulting from the implementation of the proposed measures, justified by a set of economic indicators to the extent as determined by the methodology - see Act No.406 / 2000 Sb. (Coll.) and as amended; MPO regulation No.213 / 2001 Sb. (Coll.) issuing the details of energy audit requirements of 14 June 2001 as amended by Regulation no. 425/2004 Sb. (Coll.) of 29 June 2004.

General properties of the building

The buildings of the basic school in Voděrady emerged gradually during the last century. The entire school campus is composed of several units. Dining room areas, junior and senior levels connected by hallways. Currently, there are 100 school children and 22 personnel.

The school is only connected to the NN distribution network, therefore, it was heated by electric storage heaters and hot water heating system, from the heat source of two storage electric heating rooms. Hot water heating is partly centralized and partly provided by the local electric hot water tanks. For the purpose of the project, the basic school is divided into two primary units: SO 01.1-dining room, boiling room, classrooms and SO 01.2-classrooms, locker rooms, SO 01.3-gym, classrooms.

Heat losses – starting status:

Unit SO 01.1 – 105.1kW
Unit SO 01.2 and Unit SO 01.3 – 193.2kW
Total energy consumption – 1256 GJ/year

Proposed austerity measures:

Thermal insulation of perimeter coat
Thermal insulation of roof
Replacing fillings
Thermal insulation of the floor in the gym
New source of heat for heating (heat pump)
New hot water heating (heat pump)
New heat source = air-water heat pumps (split): 2x HP3AW 22 SB for Unit SO 01.1 and 3x HP3AW 30 SB for Units SO 01.2 and SO 01.3.
Heat loss - new status:
Unit SO 01.1 - 74,8kW
Unit SO 01.2 and Unit SO 01.3 - 136,7kW
Estimated total energy consumption - 253 GJ / year
The description of the heat source for Unit SO 01.1


Two heat pumps HP3AW 22 SB (split) were installed in this unit, which are connected to three storage tanks with the capacity of 750 litres. The output from the storage tanks is divided in the bifurcator into individual heating circuits. Two electric boilers with the output of 45 kW and 38 kW were used as a bivalent heat source. Electric boilers are connected in parallel. Hot water heating is provided for by one of the heat pumps through the plate heat exchanger with subsequent reheating in electric storage tank. Heat pumps vaporizers are located on the roof of Unit SO 01.1.

The description of the heat source for Unit SO 01.2 and SO 01.3

Three heat pumps HP3AW 22 SB (split) were installed in these units, which are connected to three storage tanks with the capacity of 750 litres. The output from the storage tanks is divided in the bifurcator into individual heating circuits. Three electric boilers with the output of 45 kW each were used as a bivalent heat source. Electric boilers are connected in parallel. Hot water heating is provided for by one of the heat pumps through the plate heat exchanger with subsequent reheating in electric storage tank. Heat pumps vaporizers are located on the roof of Unit SO 01.2.

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