The purpose of Eco Niwas Samhita 2021 (Code Compliance and Part-II: Electro- Mechanical and Renewable Energy Systems) (referred to as ‘ENS-C&2’ ) is for code compliance and to provide the minimum requirement(s) for building services, electro-mechanical and renewable energy systems for new residential buildings.
In order to demonstrate compliance with the code, the building shall comply with all of the mandatory requirements along with either of the two approaches
| Building Envelope | Part-1 of the code needs to be followed for compliance with building envelope. Click here to go to Part-1 checklist |
|---|---|
| Power Factor | All 3 phase shall maintain the power factor of 0.97 at the point of connection |
| Energy Monitoring | Residential buildings or residential part of mixed land use building projects ( built on a plot area of >= 500m2) shall monitor the electrical energy use for each of the following separately:
Monitoring Standard Operating Procedure (SOP):
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| Electric vehicle charging system | If an Electric Vehicle Charging Infrastructure is installed in the premise, it shall be as per revised guidelines issued by Ministry of Power for Charging Infrastructure for Electric Vehicles on 1st October 2019, or any subsequent amendments. |
| Electrical system |
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The Elevators installed in the ENS compliant building shall meet the following requirements:
Either hydro-pneumatic pumps having minimum mechanical efficiency of 70% or BEE 5 star rated Pumps shall be installed in the ENS building.
Power transformers of the proper ratings and design must be selected to satisfy the minimum acceptable efficiency at 50% and full load rating. The permissible loss shall not exceed the values listed in the code for dry type transformers and BEE 5-star rating for oil type transformers
All measurement of losses shall be carried out by using calibrated digital meters of class 0.5 or better accuracy and certified by the manufacturer. All transformers of capacity of 500 kVA and above would be equipped with additional metering class current transformers (CTs) and potential transformers (PTs) additional to requirements of Utilities so that periodic loss monitoring study may be carried out.
The Table below gives the component wise distribution of points for each building component to achieve minimum ENS Score
| Components | Minimum Points | Additional Points | Maximum Points |
|---|---|---|---|
| Building Envelope | |||
| Building Envelope | 47 | 40 | 87 |
| Building Services | |||
| Common area & exterior lighting | 3 | 6 | 9 |
| Elevatore | 13 | 9 | 22 |
| Pumps | 6 | 8 | 14 |
| Electrical Systems | 1 | 5 | 6 |
| Indoor Electrical End-Use | |||
| Indoor Electrical | 12 | 12 | |
| Comfor Systems | 50 | 50 | |
| ENS Score | 70 | 130 | 200 |
| Minimum ENS Score Requirement | |
|---|---|
| Project Category | Minimum ENS Score |
| Low rise buildings | 47 |
| Affordable Housing | 70 |
| High rise buildings | 100 |
The code also provides additional 20 points for renewable energy as mentioned in Table below which can be availed after fulfilling the minimum points criteria
| Score for Renewable Energy System Components | |||
|---|---|---|---|
| Renewable Energy System Components | Minimum Points | Additional Points | Maximum Points |
| Solar Hot Water System | 10 | 10 | |
| Solar Photo Voltaic | 10 | 10 | |
| Additional ENS Score | 20 | 20 | |
| 1 | Building Envelope | Opaque construction materials and their thermal properties including thermal conductivity, specific heat, density along with thickness; fenestration U-factors, solar heat gain coefficients (SHGC), visible light transmittance (VLT); overhangs and side fins and operable window area; Note: Construction drawings and specifications shall show all pertinent data and features of the building, equipment, and systems in sufficient detail to permit the authority having jurisdiction to verify that the building complies with the requirements of this code. |
|---|---|---|
| 2 | Building Services | Common area lighting (lamp efficacy for lamps and their controls); pump efficiencies; elevator technologies and their controls; transformer losses; power distribution losses; power factor correction devices; basement ventilation controls; efficiency of charging infrastructure and electric check metering and monitoring system; Note: Construction drawings and specifications shall show all pertinent data and features of the building, equipment, and systems in sufficient detail to permit the authority having jurisdiction to verify that the building complies with the requirements of this code. |
| 3 | Indoor Electrical End Use | Indoor lighting (type, number, and wattage of lamps and ballasts; automatic lighting shutoff, occupancy sensors, and other lighting controls); ceiling fans star labelling; service hot water type and their efficiency; air-conditioners (system and equipment types, sizes, efficiencies, and controls); Note: Construction drawings and specifications shall show all pertinent data and features of the building, equipment, and systems in sufficient detail to permit the authority having jurisdiction to verify that the building complies with the requirements of this code. |
| 4 | Renewable Energy System | System peak generation capacity, solar water heating system; technical specifications, renewable energy zone area. Note: Construction drawings and specifications shall show all pertinent data and features of the building, equipment, and systems in sufficient detail to permit the authority having jurisdiction to verify that the building complies with the requirements of this code. |
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Last Updated : 08/28/2022