Decree No. 264 / 2020 Coll.
Decree on the energy performance of buildings
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Order
Effective from 01.09.2020
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264
DECLARATION
of 29 May 2020
on the energy performance of buildings
The Ministry of Industry and Trade provides pursuant to § 14 (4) of Act No. 406 / 2000 Coll., on Energy Management, as amended by Act No. 165 / 2012 Coll., Act No. 318 / 2012 Coll., Act No. 310 / 2013 Coll., Act No. 131 / 2015 Coll. and Act No. 3 / 2020 Coll., ("the Act ') for the implementation of § 7 (7) and § 7a (6) of the Act:
Subject matter
This decree implements the relevant provisions of the European Union1) and provides for
(a) the cost-optimal level of energy performance requirements for new buildings, major changes in completed buildings, other than major changes in completed buildings and nearly zero-energy buildings;
(b) the method for calculating the energy performance of the building;
(c) a model for assessing the technical, economic and environmental feasibility of alternative energy supply systems;
(d) a model for setting recommended measures to reduce the energy performance of the building;
(e) the design and content of the licence and the manner in which it is processed; and
(f) the location of the licence in the building.
Basic concepts
For the purposes of this decree:
(a) a reference building of the same type, of the same geometric shape and size, including glazed surfaces and parts, the same orientation to the world parties, shielding of surrounding buildings and natural obstacles, the same internal structure and with the same typical use and the same climate data considered as the building under assessment, but with reference values for the characteristics of the building, its structures and its technical systems;
(b) the typical use of the building by the usual use of the building in accordance with the conditions of the indoor and outdoor environment and operation laid down for the purposes of calculating the energy performance of the building;
(c) outdoor air, air in adjacent non-heated spaces, adjacent soil, adjacent building and, in the case of an assessment of the whole part of the building, another neighbouring zone;
(d) a residential zone containing apartments and spaces fulfilling the functions of home roads and home furnishings for such apartments, with the exception of a garage in a residential building or in a residential part of a building of another purpose;
(e) natural ventilation based on the principle of temperature and pressure difference between internal and outdoor air;
(f) forced ventilation by mechanical equipment;
(g) a mass or phenomenon energiser which may be used to produce mechanical work, heat or to control chemical or physical processes;
(h) calculated energy consumption, to be determined from the energy requirement to ensure typical use of the building, including the efficiency of the technical systems, in the case of fuel consumption, energy consumption is related to fuel calorific value;
(i) the auxiliary energy required for the operation of the technical systems;
(j) primary energy from non-renewable energy sources which has not undergone any transformation process;
(k) technology of equipment whose energy consumption is not included in the total energy delivered to the evaluated building and is not part of the technical systems of the building;
(l) waste heat from thermal energy technology, which is produced as a by-product of the transformation and final consumption of energy in connection with the operation of the technology and which can be used as an energiser for partial energy supplied if the production of that heat energy has not been included in the total energy supplied to the evaluated building;
(m) an envelope of the integrated part of the building of all the heat exchange structures at the border of the integrated part of the building, which are exposed to an adjacent environment which consists of outdoor air, adjacent soil, internal air in the adjacent unheated space or adjacent building or adjacent zone of the building not falling into the whole part of the building;
(n) an interconnected set of buildings, technical systems of buildings, technologies and energy generation and management facilities located on land or land adjacent to each other; individual plots of land may be separated from each other by, for example, infrastructure, special purpose roads, watercourses or railways; the external borders of the land or sets of land form the boundaries of the site,
(o) a building zone or part thereof with similar characteristics of the indoor environment, the use regime and the composition of the technical system of the building according to the Czech technical standard governing the calculation of heating and cooling needs (2);
(p) the system boundary of the construction surface of the building, which continuously covers the volume of the whole part of the building in application of the rules of the Czech technical standard governing the energy performance of the building 8),
(q) electricity generation for the own consumption of the electricity generation plant under the Energy Act located on the site and intended for the production of electricity for consumption on the premises.
Energy performance indicators of the building and their determination
(1) The energy performance indicators of the building are:
(a) primary energy from non-renewable energy sources per square metre of energy-related area;
(b) the total energy delivered per year per square metre of energy-related area;
(c) partial energy supplied for technical heating, cooling, forced ventilation, humidity adjustment, hot water preparation and lighting of the inner space of the building per year per square metre of energy-related area;
(d) the average coefficient of heat transfer;
(e) heat transfer factors for individual structures on the system boundary;
(f) the effectiveness of the technical systems.
(2) The values of the energy performance indicators of the evaluated building and reference building are calculated on the basis of the project documentation and in accordance with the methodology for assessing the energy performance of the building as set out in Annex 5 to this Decree. In the case of completed buildings, the input data for the calculation shall be in accordance with the current building technical condition of the building.
(3) For the calculation of the values of the energy performance indicators of the reference building, the values of the building parameters, building elements and structures and technical systems of the building referred to in Annex 1 to this Regulation and the parameters of typical use of the building based on the optimum level of sound indoor environment, indoor air quality and thermal comfort shall be used.
(4) The calculation of the total energy delivered and the partial energy supplied for the technical heating, cooling, forced ventilation, humidity adjustment, hot water preparation and lighting of the interior of the building shall be carried out in accordance with the procedure laid down in Section 4.
(5) The calculation of primary energy from non-renewable energy sources shall be carried out in accordance with the procedure set out in Section 5.
(6) The calculation of the average heat transfer coefficient and heat transfer factors of individual structures at the system border shall be carried out according to the Czech technical standard for the calculation methods of thermal protection of buildings 2).
(7) The calculation of the efficiency of the technical heating systems, cooling, forced ventilation, humidity adjustment, hot water preparation and lighting of the interior of the building shall be carried out according to the relevant Czech technical standards.
(8) Where electricity from the production of the own-account electricity placed on the premises is also supplied to the evaluated building, the electricity thus supplied may also be taken into account in the calculation of the energy performance indicators of the assessed building; In such cases, the energy performance calculation rules set out in Annex 6 to this Decree shall apply for the calculation of the energy performance values of the assessed building.
Calculation of supplied energy
(1) The value of the energy delivered is the sum of the calculated energy consumption and auxiliary energy. The calculation of the values of the total energy delivered and of the partial energy delivered shall be carried out at a time interval (hereinafter referred to as the "calculation step ') of the calculation of not more than one month and per zone. In buildings or zones with cooling, moisture treatment or electricity production, the calculation shall be made by a step of not more than one hour.
(2) The total value of the energy delivered shall be determined by the sum of the values of the energy delivered. The calculation of the total energy delivered shall also include the determination of the total energy delivered by energy carriers.
(3) The value of the sub-supplied heating energy is determined as the sum of the calculated consumption of heating and auxiliary energy for the operation of the technical heating system according to the Czech technical standard for the calculation of heating and cooling energy needs (3) and the Czech technical standard for thermal systems in the buildings (4), using typical building usage values based on the optimal level of sound indoor environment, indoor air quality and thermal comfort.
(4) The value of the partial energy supplied for cooling shall be determined as the sum of the calculated energy consumption for cooling and auxiliary energy for the operation of the technical system for cooling according to the Czech technical standard for the calculation of the energy needs for heating and cooling (3) using the values of typical use of buildings. The energy supplied for heating swimming pool water and hot water for the operation of wellness is included in the total energy balance of the building when these plants are located inside the envelope of the building.
(5) The value of the partial energy supplied for forced ventilation shall be determined as the sum of the calculated energy consumption for the transport of the air needed to ensure the required air exchange in the internal environment and auxiliary energy for the operation of the technical system for forced ventilation according to the Czech technical standard for building ventilation 5) using the values of typical use of buildings based on the optimal level of sound internal environment.
(6) The value of the partial energy supplied to adjust the humidity shall be determined as the sum of the calculated energy consumption to adjust the humidity and auxiliary energy to the operation of the technical system to adjust the humidity to the Czech technical standard for ventilation of buildings 5) using the values of typical use of buildings.
(7) The value of the partial energy supplied for the preparation of hot water shall be determined as the sum of the calculated energy consumption for the preparation of hot water and auxiliary energy for the operation of the technical system for the preparation of hot water according to the Czech technical standard for thermal systems in buildings governing the efficiency of the systems for the preparation of hot water6) using the values of typical use of buildings.
(8) The value of the partial energy supplied for the illumination of the interior of the building shall be determined as the sum of the calculated energy consumption for the illumination of the interior of the building and the auxiliary energy for the operation of the technical system for the illumination of the interior of the building according to the Czech technical standard for the energy evaluation of buildings governing the energy requirements for the illumination of the interior of the building (7), using the values of typical use of buildings based on an optimal level of sound internal environment. For zones where the user decides on the energy performance of the interior lighting, the values applicable to the reference building shall apply.
(9) In calculating the value of the energy supplied, the following rules shall apply:
(a) the part of the energy supplied shall not be counted for the generation of electricity or heat supplied outside the building;
(b) the energy supplied by a building which draws energy from a source outside that building without the use of a distribution or thermal energy supply system under the Energy Act shall be accounted for in the production and distribution of energy from that source to the building;
(c) the energy supplied is also included in the building in technical systems located in accordance with Section 5 (2) (a) of the produced and used energy of solar radiation, wind, water and geothermal energy, excluding heat pumps;
(d) the supplied energy is also part of the supplied energy when the heat pump is used. This shall be calculated as the difference between the energy needs supplied by the heat pump and the calculated energy consumption of the heat pump,
(e) energy to illuminate the inner space of the building, forced ventilation, humidity adjustment and hot water preparation used in spaces without a modified internal environment, if they are part of the building;
(f) in zones with unspecified functional applications where the installation of one or more heating systems, cooling systems, forced ventilation, humidity adjustment, hot water preparation and lighting of the building's internal space is decided upon after completion of the construction, typical use values according to the Czech technical standard governing the energy performance of the building (8) shall be used for the intended use of these premises. If the proposed systems are not defined by their technical parameters in the project documentation, the values applicable to the reference building shall be used for them. The installation of heat-carrier distributions without the simultaneous installation of a source and appliances is not considered a proposed technical system of the building.
Calculation of primary energy from non-renewable energy sources
(1) The value of primary energy from non-renewable energy sources for the rated building is calculated as the sum of the product of the values of the energy supplied determined in accordance with Section 4, in the breakdown by energy-carriers and the relevant primary energy factors from non-renewable energy sources listed in Annex 3 to this Decree.
(2) When calculating the value of primary energy from non-renewable energy sources of the evaluated building, account may be taken of:
(a) energy produced for its use in the rated building by technical systems located within the system boundary of the rated building, on the rated building, on the land immediately adjacent to the building, on the premises or on ancillary buildings of the type of shelter for parking, fencing, supporting walls or reinforced areas serving the rated building;
(b) the electricity produced by the technical systems referred to in (a) up to its use
1. in the evaluated building,
2. outside the rated building by supplying it to the electricity system; or
3. outside the rated building by its delivery to the premises in accordance with Annex 6 to this Decree;
(c) heat and cold produced in the local heat and cold supply system, provided that the evaluated building is connected to it; in this case, the calculation shall be carried out in accordance with the methodology set out in Annex 5 to this Decree;
(d) heat and cold produced by the technical systems referred to in (a) and supplied to the heat supply system, up to a maximum of the value of the total energy delivered in the evaluated building.
(3) Electricity produced by the technical systems referred to in paragraph 2 (a) shall be included in the calculation of the value of primary energy from non-renewable energy sources of the evaluated building only for one building or, if the electricity supplied pursuant to Paragraph 3 (8) for several buildings is taken into account, in accordance with the rules set out in Annex 6 to this Decree.
(4) The energy referred to in paragraph 2 (b) shall be counted at each step of the calculation.
(5) Primary energy from non-renewable energy sources for the reference building is calculated
(a) multiplying the calculated values of energy consumption and auxiliary energy for each technical system by the primary energy factors of non-renewable energy sources by the types of consumption listed in Table 4 of Annex 1 to this Decree; and
(b) by reducing the value of primary energy from non-renewable energy sources determined in accordance with point (a) by the value shown in Table 5 of Annex 1 to this Decree.
Energy performance requirements for buildings set at cost-optimal level
(1) The energy performance requirements of an almost zero-energy building and for a nearly zero-energy building as from 1 January 2022, as determined by calculation at the cost-optimal level, are met if the values of the energy performance indicators of the assessed building referred to in Article 3 (1) (a), (b) and (d) do not exceed the reference values of the energy performance indicators for the reference building.
(2) The energy performance requirements for a greater change in the completed building and for a change other than a major change in the completed building, as determined by calculation at the cost-optimal level, are met if:
(a) the values of the energy performance indicators of the evaluated building referred to in Article 3 (1) (a) and (d) are not higher than the reference values of those energy performance indicators for the reference building;
(b) the values of the energy performance indicators of the assessed building referred to in Article 3 (1) (b) and (d) are not higher than the reference values of those energy performance indicators for the reference building; or
(c) the value of the energy performance indicator of the evaluated building for all new and changed building elements of the envelope of the building referred to in Section 3 (1) (e) is not higher than the reference value of that energy performance indicator set out in Table 2 of Annex 1 to this Decree; and
(d) the value of the energy performance indicator of the assessed building for all changed technical systems of the building referred to in § 3 (1) (f) is not lower than the reference value of that energy performance indicator set out in Table 3 of Annex 1 to this Decree.
(3) In cases of a change in a completed building where the total energy-related area is extended to at least two and a half times the original total energy-related area, the requirements for the whole building referred to in paragraph 1 shall be met. In other cases, the requirements for the whole building referred to in paragraph 2 shall be met.
(4) For the purposes of Paragraph 2 (1) (s) of the Act, the rate of change in the total area of the envelope of the building is determined for the purpose of the amendment of the completed building.
Assessment of the technical, economic and environmental feasibility of alternative energy supply systems
(1) The technical feasibility of alternative energy supply systems is the technical possibility of installing or connecting an alternative energy supply system. If the alternative energy supply system is not technically feasible, its economic and environmental feasibility shall not be assessed.
(2) Economic feasibility means achieving a simple return on investment in an alternative energy supply system shorter than its lifetime (9). In the case of a thermal energy supply system, the economic feasibility of that alternative system is to achieve a simple return period for investment in a new non-alternative energy supply system that is or is to be used in the building longer than the lifetime of this new non-alternative energy supply system.
(3) Environmental feasibility means the installation or connection of an alternative energy supply system without increasing the amount of primary energy from non-renewable energy sources compared to the current or proposed state.
(4) The assessment of the technical, economic and environmental feasibility of alternative energy supply systems is part of the licence protocol, the model of which is set out in Annex 4 to this Decree.
Model for setting recommended measures to reduce the energy performance of the building
(1) The licence shall include the setting of recommended measures to reduce the energy performance of a building in the form of a set of appropriate measures to reduce the energy performance of a building containing at least one alternative energy supply system, where it has been assessed as technically, economically and ecologically feasible in accordance with Section 7.
(2) A set of appropriate measures to reduce the energy performance of the building is proposed to achieve the primary energy indicator from non-renewable energy sources
(a) classification classes particularly cost-effective in the case of construction of a new building or class of savings in existing buildings classified below that level; and
(b) an improvement of at least one classification grade for existing buildings meeting the austerity class.
(3) The set of appropriate measures to reduce the energy performance of the building consists of technically feasible measures in order to respect the efficiency of the spent resources in terms of operating costs and the quality of the internal environment of the buildings. For a set of appropriate measures to reduce the energy performance of a building, economic feasibility may not be achieved at the time of processing of the licence.
(4) The effect of a set of appropriate measures to reduce the energy performance of the building shall be evaluated on the basis of the saving of heating demand, the total energy supplied and the primary energy from non-renewable energy sources, including the synergistic effects of the sub-measures.
(5) The determination of a set of appropriate measures to reduce the energy performance of the building is part of the licence protocol, a model of which is set out in Annex 4 to this Decree.
Model and contents of the licence
(1) The card consists of a protocol and a graphical representation.
(2) The licence protocol shall contain:
(a) identification of the building;
(b) information on the total energy supplied and its annual operation;
(c) information on primary energy from non-renewable energy sources;
(d) the balance of heat flows;
(e) information on the envelope of the building,
(f) information on the technical systems of the building;
(g) a set of appropriate measures to reduce the energy performance of the building and use alternative energy supply systems;
(h) an overview of the compliance with the requirements under Section 6;
(i) a source where information can be obtained to enable the proposed measures to be implemented to reduce the energy performance of the building, to determine the costs of implementing these measures and their financing; and
(j) identification of the energy specialist, his signature and date of drawing up of the licence.
(3) The model of the licence is set out in Annex 4 to this Decree.
(4) Graphic representation of the licence
(a) is the same for a building with almost zero energy consumption, a building with almost zero energy consumption from 1 January 2022, a larger change in the finished building, other than a larger change in the finished building and for the sale and lease of the building or its integrated part;
(b) include the classification of a building in the classification classes of the energy performance of a building (hereinafter referred to as the classification class);
(c) is placed symmetrically on a white background of A4 format in height using standard font fonts in accordance with the model set out in Annex 4 to this Decree;
(d) contain the energy performance indicators of the building in relation to the energy reference area.
(5) Classification classes A to G, whose verbal expression and values for their upper limit are set out in Annex 2 to this Decree, shall be determined for the total energy supplied, the primary energy from non-renewable energy sources, the partial energy supplied and the average coefficient of heat transmittance, and shall be used in the graphical representation of the pass referred to in Annex 4 to this Decree.
(6) The boundaries of the classification classes referred to in paragraph 5 shall be determined from the reference value of the classified energy performance indicator of the ER building, which shall be determined uniformly for the reference conditions specified for the nearly zero-energy building as from 1 January 2022 in Annex 1 to this Decree. In case of modification of the completed building, construction of a building with almost zero consumption and sale or rental of the existing building, the same scale of classification classes as for a building with almost zero energy consumption shall apply from 1 January 2022.
(7) If there are only residential zones in the rated building, the cooling sub-energy classification class shall not be determined. In other cases, when determining the classification class for partial energy supplied for cooling, partial energy delivered for cooling in the residential areas of the rated building shall not be considered.
(8) Where energy from an area referred to in § 3 (8) is taken into account, the protocol for the certification of the balance of primary energy from non-renewable energy sources shall contain the area processed in accordance with Annex 7 to this Decree in the form of an annex to the Protocol.
Conditions for the location of the licence in the building
The graphical representation of the licence in the version set out in Annex 4 to this Decree shall be placed on the surface of the outer wall of the building immediately adjacent to the public entrance to the building or the area of the vertical wall in the entrance space within the building adjacent to that entrance in the cases provided for in Section 7a (1) (d) of the Act.
Repeal
They shall be deleted:
1. Decree No. 78 / 2013 Coll., on the energy performance of buildings.
2. Decree No. 230 / 2015 Coll., amending Decree No. 78 / 2013 Coll., on the Energy Performance of Buildings.
Efficacy
This Regulation shall enter into force on 1 September 2020, with the exception of the third sentence of Article 4 (1), which shall take effect on 1 January 2023.
Minister:
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Příloha č. 1
Annex No 1 to Decree No 264 / 2020 Coll.
Parameters and values of the reference building, benchmarks for new and changed building elements of the building envelope and benchmarks for new and modified technical systems of the building
(1) The parameters and values of the reference building are set in such a way as to ensure the cost-optimal level of energy performance of buildings and building elements, calculated for their expected economic life cycle in accordance with the comparative methodological framework (1), with a view to achieving an optimal level of sound internal environment, indoor air quality and thermal comfort.
(2) The parameters and their values in Tables 1, 4 and 5 of this Annex characterise the reference building for demonstrating the requirement to evaluate the whole building. For parameters affecting the calculation of the energy performance of a building for which reference values are not set, the values corresponding to the proposed building shall be used.
(3) Tables 2 and 3 of this Annex specify the parameters and their benchmarks for new and modified building envelope elements and for new and modified building technical systems within the framework of the change of the completed building for demonstrating requirements only the characteristics of these elements as referred to in Article 6 (2) (c).
(4) The reference value of the average heat transmittance coefficient of the Uem building, R is determined according to the relationship
| Uem,R = ∑ HT,R,j / ∑ Aj + fR.∆Uem,R | (1) |
where
HT, R, j is the reference specific heat flow through the heat exchange design of the building envelope, in W / K, as determined in accordance with paragraph 5;
The surface of the first heat exchange structure of the envelope of the building with reference specific heat flow through HT, R, j > 0, in m2, determined from external dimensions;
fR the reduction factor of the required baseline average heat transmittance coefficient in accordance with Table 1 of this Annex;
ITEM, R reference value of the mark-up on the influence of thermal bonds, in W / (m2.K), according to Table 1 of this Annex.
(5) The reference specific heat flow through the heat exchange design of the HT, R building envelope shall be determined according to the relation
| HT,R,j = Aj . UR,j.bj | (2) |
for floor structures on earth in zones with a θim > 5 ° C, the reference fixed specific heat flow shall be HT, R, j at least
| HT,R,min,j = Aj . UR,j.(θim – 5) / (θim – θe) | (3) |
where UR, j is the reference value of the heat transmittance coefficient of the building envelope, in W / (m2.K), determined in accordance with paragraph 6;
bj the temperature reduction factor of the above-mentioned heat-exchange structure of the building envelope, non-dimensional, determined according to ČSN 73 0540-2, with the lowest permissible value being 0;
θim prevailing design internal temperature in the zone adjacent to the first heat exchange construction of the building envelope, in ° C, according to ČSN 730540-2;
high design temperature of outdoor air in winter, in ° C, according to ČSN 730540-3.
(6) The reference value of the heat transmittance coefficient of the first heat exchange design of the cover of the UR building, j shall be determined by:
(a) for the construction of an envelope of a building in a zone operated as a freezer or cold store according to the relationship
| UR,j = UN,j | (4) |
where the UN, j is the required heat transmittance coefficient of the first heat exchange structure of the building envelope, in W / (m2.K), determined for the design internal temperature in the adjacent zone according to ČSN 14 8102, the required value for the apertures shall be used plus 30% for the perimeter walls;
(b) for the construction of a building envelope in other zones according to the relationship
| UR,j = fR . e1.UN,20,j | (5) |
Not more than
| UR,j,max = fR . e1.(UN,20,W + 0,4 – AW/AF) | (6) |
where e1 is the coefficient of the type of zone adjacent to the heat-exchange design of the envelope of the building, which shall be determined by:
(a) for zones with a θim from 18 ° C to 22 ° C inclusive as:
| e1 = 1; | (7) |
(b) for other zones such as:
| e1 = 16 / abs (θim – 4); nejméně však 0,75 a nejvýše však 1,75; | (8) |
UN, 20j required heat transmittance coefficient of the first heat exchange structure of the building envelope, in W / (m2.K), determined for the predominant design internal temperature of the θim at an interval of 18 ° C - 22 ° C including according to ČSN 73 0540-2, except for light circumferential casing, for which opaque fillings the required standard value UN, 20 according to ČSN 73 0540-2 for the outer wall and for transparent fillings the required standard value UN, 20 according to ČSN 73 0540-2 for the filling of the aperture in the outer wall;
UN, 20, W required value of heat transfer coefficient for opening filler in the outer wall, in W / (m2.K), determined for the predominant design internal temperature of 20 ° C according to ČSN 73 0540-2;
AW total area of vertical transparent heat exchange structures of the envelope of the building in contact with outdoor air, in m2, determined from external dimensions;
AF total area of vertical transparent and opaque heat exchange structures of the envelope of the building in contact with outdoor air, in m2, determined from external dimensions,
with a vertical design of a design the deflection of which does not exceed ± 30 ° from the vertical plane.
(7) The procedure laid down in paragraphs 4 to 6 also applies to the whole part of the building.
(8) The power consumption of the SFPah fan for a specific working point at each step of calculating the energy performance of the building to determine the energy consumption of its operation shall be calculated using the formula:
| SFPahu,set / SFPahu,max = 1,0547 + (-2,5576) . r + 3,6314 . r2 + (-1,1285) . r3 | (9) |
(9) The ratio of the transported volume to the rated fan capacity r shall be calculated as:
| r = Vahu,set / Vahu,max | (10) |
where:
The balance, set is the average volume of air transported behind the calculation step (hour) for a given fan in m3 / hour.
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Regulation Information
| Citation | Decree No. 264 / 2020 Coll., on the Energy Performance of Buildings |
|---|---|
| Regulation Type | Order |
| Author | - |
| Collection | Code of Laws |
| Date of Promulgation | 05.06.2020 |
|---|---|
| Effective from | 01.09.2020 |
| Effective until | - |
| Status | Valid |
The regulation text is for informational purposes only.
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