Statybos techninis reglamentas STR 2.01.01(6):2008 – Energy Saving and Heat Retention Standards
Statybos techninis reglamentas STR 2.01.01(6):2008, titled Esminis statinio reikalavimas „Energijos taupymas ir šilumos išsaugojimas“ (Essential Requirement: Energy Saving and Heat Retention), is a mandatory technical regulation issued by the Ministry of Environment of the Republic of Lithuania. Approved by Order No. D1-131 on March 12, 2008, this statute defines one of the six essential requirements for buildings as stipulated under the Law on Construction of the Republic of Lithuania. It serves as the primary regulatory framework for energy efficiency in the built environment, aligning national standards with European Council Directive 89/106/EEC regarding construction products.
The regulation governs the design and construction of buildings and their engineering systems, including heating, ventilation, and cooling. It applies to all participants in the construction process, including architects, structural engineers, and contractors, as well as municipal planners and state supervisory institutions. The document establishes technical indicators for indoor climates and defines the performance characteristics required for construction products and building envelope components. It incorporates a structured approach to energy regulation through specific methods of assessment, ranging from individual product requirements to total energy consumption modeling.
The following sections detail the core technical indicators, regulatory methods, and specific product requirements defined within the document's framework to ensure buildings maintain thermal integrity and minimize energy expenditure during their service life.
Basic Technical Indicators for Energy Efficiency
Section IV of the regulation identifies the primary technical indicators related to energy use. Buildings and their engineering systems must be designed to minimize energy consumption while accounting for local climatic conditions and occupant needs.
- Space Heating: Requirements for maintaining thermal energy within indoor spaces.
- Space Cooling: Energy parameters for cooling systems and heat gain prevention.
- Humidity Regulation: Control of indoor air moisture levels.
- Hot Water Preparation: Energy efficiency in domestic hot water systems.
- Ventilation: Standards for natural and mechanical air exchange.
Methods of Regulation and Assessment
Chapter V defines five distinct methods (penki būdai) for regulating energy saving and heat retention. These methods provide the basis for compliance verification during the design and construction phases.
- Method 1: Establishing requirements for individual construction products used in the building envelope, including thermal resistance and vapor permeability.
- Method 2: Setting technical requirements for building parts and engineering system components, such as walls, roofs, boilers, and fans.
- Method 3: Determining performance characteristics for the entire building or its engineering systems, including air permeability and total thermal loss.
- Method 4: Establishing energy power requirements for the building, such as annual energy consumption for heating and cooling based on internal heat gains.
- Method 5: Setting energy power requirements for the supplied engineering systems to evaluate their efficiency and source characteristics.
Requirements for Construction Products and Engineering Systems
The regulation mandates specific performance characteristics for materials and equipment. According to Chapter VII and the associated tables, products must be evaluated based on their thermal and mechanical properties.
- Table 1 (Product Characteristics): Includes density, thermal conductivity (šilumos laidumas), specific heat, and water vapor diffusion resistance.
- Table 2 (Envelope Elements): Covers thermal transmittance, air permeability (laidumas orui), and solar energy transmittance.
- Table 3 (Engineering Equipment): Details nominal efficiency and power consumption for boilers, heat pumps, heat exchangers, and ventilation units.
Frequently Asked Questions
What is the primary objective of STR 2.01.01(6):2008?
The regulation specifies the essential building requirement for energy saving and heat retention to ensure buildings and their engineering systems use minimal energy relative to climatic conditions and occupant needs.
Which EU directive is this regulation aligned with?
It is aligned with the principles of the European Council Directive 89/106/EEC regarding construction products (SPD).
What are the five methods of energy regulation mentioned in the document?
The five methods range from setting requirements for individual products and building parts to evaluating the energy performance of entire systems and the total energy consumption of the building.
What factors determine energy consumption according to this regulation?
Energy use is determined by the external environment, internal climate requirements, building design decisions, construction product characteristics, and the operation and maintenance of the building.
Are there specific requirements for boilers and heat pumps?
Yes, Table 3 specifies characteristics such as nominal efficiency, energy consumption without load, and efficiency coefficients at various load levels (20%, 40%, 60%, 80%).
How are construction product characteristics expressed?
They are expressed through design values specified in regulatory documents, calculated design values, measured values, or values declared by the manufacturer.
What constitutes 'normal use' of a building under this regulation?
It refers to the combination of preventive and other measures intended to ensure the building meets its intended purpose throughout its service life, including maintenance and repairs.
Who is responsible for complying with these regulations?
Compliance is mandatory for all construction process participants, state supervisors, and municipalities involved in the design and oversight of building projects in Lithuania.
