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2 > Status of the implementation

Calculation procedures

The calculation procedures (Article 3) have been adopted by Ordinance on Energy conservation and heat retention of buildings - in force since 1 March 2005 by the Minister of Regional Development and Public Works. These are: › technical requirements for energy conservation and heat retention in buildings;

› methodology for defining annual energy consumption, taking into account: heat losses through the building structures and windows, heat gains of internal sources and solar radiation, climatic data, and other specific requirements for buildings;

› specific requirements and procedures for new and for existing buildings;

› technical rules and norms for design of thermal insulation, including values of the coefficients thermal transmittance;



Climatic zones in Bulgaria.

rules for water vapour penetration, water tightness, air leakage and solar protection during the summer period;

› technical criteria for determination of the main indicators for energy consumption which are different for:

o Residential building - annual energy consumption for heating per 1 m2;

o Non residential building – coefficients of specific transmission thermal losses through the building envelope and elements

o Low temperature non residential building - annual energy consumption for heating per 1 m3.

Table 1. The maximum standard values of the annual heating energy consumed per one cubic

meter volume (Q /max

h

fo, m-1

1

≤ 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1,0

≥ 1,05

(Q /max

h

33,9 36,5 39,0 41,6 44,2 46,7 49,3 51,8 54,4 55,7

Ve ) for

non-residential low temperature buildings.

V e ),

kWh/m3 2

The maximum standard values of the annual heating energy consumed per one cubic meter volume for non-residential low temperature buildings are

defined in Table 1. The values depend on form factor f0 = A Ve . This

/

table is applied for buildings that are heated longer than three months per year with internal air temperature from 12 up to 19 °С, as well as for sport and cultural season heated buildings, heated for three or more months annually, at design internal temperatures higher than 15 °С.

A general description of the calculation method has been made, keeping the basic requirements of the following European standards - EN 832 EN 13 370, EN 13 789 and is given in www.mrrb.government.bg.

Requirements for new buildings

Also on 1 March 2005, the Minister of Regional Development and Public Works adopted the minimum requirements for all new buildings (www.mrrb.government.bg). The requirements come into force for building permits requested after 1 March 2005.

The type and level of requirements are governed by the function of and the type of building - residential buildings and non residential building \education, hospitals, offices, hotels, schools\ and may cover: › Maximum U-value;

(1) The heat conduction coefficient (U) is determined in accordance to Bulgarian БДС EN ISO 6946.

(2) The U values for heated buildings may not be higher than the values shown in Table 2.

› Requirement on average insulation level; › Maximum primary energy consumption per m² of floor area.

EPBD Buildings Platform > P076_EN_Bulgaria-March2008

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