Energy Conservation Building Code for residential buildings 2017 (DRAFT DUE TO BE FINALISED IN 2019)

Last updated: 23 July 2019

The code aims at limiting heat gains/loss from building envelope and for ensuring adequate natural ventilation and day lighting.

To limit the heat gain/loss from the building envelope, the code specifies:

• Maximum value of Residential Envelope Transmittance Value (RETV) for building envelope (except roof) applicable for four climate zones1, viz. Composite Climate, Hot dry

Climate, Warm-humid Climate and Temperate Climate.

• Maximum value of thermal transmittance of building envelope (except roof) for Cold Climate zone (Uenvelope,cold)

• Maximum value of thermal transmittance of roof for all climate zones

To ensure adequate natural ventilation, the code specifies

• Minimum Openable window-to-floor area ratio (WFRop)

To ensure adequate day-lighting, the code specifies

• Minimum Visible Light Transmittance (VLT) for the non-opaque building envelope components

The code is applicable to all residential use building projects built on plot area ≥ 250 m2

. The

type of building projects includes, but not limited to:

• Group housing projects2

: Building unit or units constructed or to be constructed with

one or more floors having more than two dwelling units having common service

facilities where land is shared and commonly used by the dwelling units, and the

construction is undertaken by one agency.

• Mixed Land Use Building projects3

: With buildings partly used for non-residential uses

and partly for residential use.

• Multi-dwelling unit building on residential plots.

Development and Implemented Authority: Bureau of Energy Efficiency (BEE), Ministry of Power, Government of India with support from USAID ECO II Project

Compliance Path Description: A building complies with the Code using the Prescriptive Method if it meets the prescribed minimum (or maximum) values for envelope components (section 4.3), comfort systems and controls (sections 5.3, 5.4 and 5.5), and lighting and controls (section 6.3), in addition to meeting all the mandatory requirements.

Insulation Energy Requirements: Refer to Subsection A1.1 for calculations on the thermal resistance of walls and roofs.

Total energy use: The ECBC uses an Energy Performance Index (EPI) which is compared to the EPI of a reference building to assess the energy performance.

Compliance Path Description:

Whole building performance method: A building complies with the Code using the Whole Building Performance (WBP) Method when the estimated annual energy use of the Proposed Design is less than that of the Standard Design, even though it may not comply with the specific provisions of the prescriptive requirements.

Building Envelope trade-off method: Building Envelope Trade-off Method may be used in place of the prescriptive criteria of sections 4.3.1, 4.3.2 and 4.3.3. A building complies with the Code using the Building Envelope Trade-off Method if the Envelope Performance Factor (EPF) of the Proposed Building is less than or equal to the EPF of the Standard Building, calculated as per section 4.3.5, in addition to meeting the prescriptive requirements for comfort systems and controls (sections 5.3 and 5.4), and lighting and controls (section 6.3), and all the mandatory requirements (sections 4.2, 5.2, 6.2 and 7.2).

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End uses covered
  • Building end-uses
  • Building systems
  • Space heating
  • Space cooling
  • Ventilation
  • Water heating
  • Lighting
  • Interior lighting
  • Building vintage
  • Existing buildings
  • New buildings