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Minimum requirements

The minimum requirements are defined in the Regulation on efficient use of energy in buildings (since September, 2008). The minimum requirements are expressed in terms of:

› maximum allowed transmission heat losses, ventilation heat losses and/or power of devices for heating (transmission and ventilation) of the building;

› maximum allowed specific cooling load and/or power of cooling system;



requirements for the obligatory installation of RES devices (min. 25% of the total power demand must be covered by the installation of RES systems). The RES requirement is considered to be fulfilled either by the installation of solar collectors for hot water (min. 6 m2/residential unit), the installation of PV panels (min. 5 W/m2 of building) or by the implementation of ice storage for cooling.

It is mandatory to prepare a “list of thermal characteristics of the building”, where the main system characteristics and simplified estimation of energy use is given.

Additional requirements refer to the maximum U values of the building’s envelope and windows (for walls 0,28 W/m2K, partitions between flats 0,90 W/m2K, flat roof 0,20 W/m2K, windows 1,3 W/m2K, doors 1,8 W/m2K) and to the air tightness of the envelope.

A considerable list of requirements refers to the energy efficiency characteristics of installations. Heat recovery in ventilation must be used due to strict requirements for maximum allowed ventilation heat losses. The minimum required rate of heat recovery in ventilation and/or AC systems is 65%. Individual electrical heaters for domestic hot water are not acceptable unless economically reasonable. New buildings must use low temperature heating systems (max 550C), as well as condensing gas boilers. Heating and cooling consumption must be metered per individual unit.

Additional requirements for cooling refer to obligatory shading of the envelope and to efficiency requirements for cooling systems.

Minimum requirements for lighting define the maximum allowed power of lighting devices per building category. Energy saving lamps are obligatory (only 20% of lighting may be covered by incandescent light bulbs).

The minimum requirement for primary energy is expressed in terms of the reference building approach. There is also a minimum requirement for the final energy needed for space heating, for the preparation of domestic hot water, and for space cooling.

The energy indicators (power of HVAC and electrical devices, primary energy for heating, DHW, cooling, AC in kWh/a and in kWh/m3a - kWh/m2a for residential buildings, % of RES using installed power, CO2/a and CO2/m3a) have to be summarized in the “list of thermal characteristics of the building” for the design stage and for the final construction after the building is completed. Fulfilment of the minimum requirements will have to be demonstrated in the designs for the building permit, and after the construction of the building is completed, when applying for permit to use the building.

EPBD Buildings Platform > P141_EN_Slovenia_Nov08

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