FAQ's

FAQ's

Chhattisgarh State Energy Conservation Building code (CGECBC) was drafted by the combined efforts of Chhattisgarh Renewable Energy Development Agency (CREDA) and Energy Conservation Building code (ECBC) cell. This code will set minimum energy efficiency levels for commercial buildings and thus will help in energy saving to a great extent.

These Frequently Asked Question (FAQs) are designed to support building developers and practitioners (energy auditors) understand the newly developed ECBC for Chhattisgarh.


The Energy Conservation Building Code (ECBC) was launched in May 2007 by the Bureau of Energy Efficiency (BEE), Ministry of Power. Its main objective is to establish minimum requirements for energy efficient design and construction of buildings. Recognizing the energy and cost savings of efficient buildings and to help address growing energy needs, the state of Uttar Pradesh is the process to notify ECBC code.

India’s two thirds of the total building stock that will exist in 2030 are yet to be built. New buildings possess a great challenge to meeting its increasing energy demand. ECBC sets minimum energy efficiency levels for commercial buildings, locking in energy savings for years to come, retaining occupant comfort, while combating climate change.

The ECBC is applicable to all buildings or building complexes that have a connected load of 100 kW or greater, or a contract demand of 120 kVA or greater, or having conditioned area of 500 m2 or more and used for commercial purposes. used for commercial purposes. It is applicable for both Government and private buildings. The code is not applicable to Equipment and portions of building systems that use energy primarily for manufacturing processes.

Irrespective of whether one opts for Whole Building Performance (WBP) method or Prescriptive method, the code compliance requires the building to fulfill a set of mandatory provisions. The mandatory requirements are described in CGECBC under sections 3.2.1, 4.2, 5.2, 6.2 and 7.2 of the CGECBC code.

No, ECBC addresses only energy efficiency of buildings. Water and other aspects are generally covered in green building rating systems.

A U value is a measure of heat loss. It is expressed in W/m2k, and shows the amount of heat lost in watts (W) per square meter of material (for example wall, roof, floor etc.) when the temperature (k) outside is at least one degree lower. The lower the U-value, the better the insulation provided by the material.

As per section 5.2.9 of CGECBC, commercial establishments such as hotels, hospitals, guest houses with a centralized system shall have either solar water heating or waste heat recovery system up-to the criteria given in the above section.

The user can find construction material properties from supplier's test certificates. If they are not available with manufacture/vendor/supplier you can refer appendix A of the ECBC for default values.

There are many software/tools available such as eQUEST, OpenStudio, DesignBuilder, IES-VE, Simergy, EnergyPlus etc. eQUEST and EnergyPlus are free tools.

The Indian Society of Heating, Refrigerating and Air Conditioning Engineers (ISHRAE) provide weather data for Indian locations for simulations. Weather files can be downloaded from EnergyPlus website for Indian cities given on the link below.


https://energyplus.net/weather-region/asia_wmo_region_2/IND%20%20

 

No, emergency lighting that is automatically off during normal building operation and is powered by battery, generator, or another alternate power source are exempted.

If the building is eligible for CGECBC, the user submitting the application for construction permission needs to fill in the CGECBC form. This could be the architect, the developer, the third-party assessor or any other citizen users.

No, it is not mandatory. While complying through the prescriptive path, use of permanent shading devices such as overhangs and fins can help to achieve required SHGC. Table 3.4 provide SHGC M-factor adjustment calculation. If you are using whole building performance method then there is no restriction on the SHGC of windows of the proposed building.

There is no partial compliance for CG ECBC. 

No, you can install any type of light fixture. If you are following prescriptive path for compliance you need to meet Lighting Power Density (W/m2 ) requirements based on Building area method or Space by space method. If WBP method is followed, your proposed design annual energy consumption must be lesser than the standard case annual energy consumption.

You can put either over deck or underdeck. For prescriptive path roof U-value needs to be met. In the hot climates, it is preferable to put insulation over deck as stopping heat at source is more effective. 

If you are following Prescriptive or Trade-off path providing cool roof is mandatory. In WBP method it is not mandatory. 

No, you cannot take benefit of shading by trees. Permanent shading devices such as overhangs and fins can be considered. Automated moveable shading system can also be installed. 

No, you can take benefit only if it is automatic shading.

The materials with initial solar reflectance of not less than 0.7 and initial emittance not less than 0.75 such as broken China Mosaic, Heat Reflective paint/tile, etc. can be used.

No. Green roofs cannot qualify as a cool roof. 

Yes. You can use a thermal imager camera to visually check the effectiveness of insulation and you can also find the infiltration through the wall. 

Aluminium conducts energy more readily than timber or uPVC and thus, aluminium products will have a higher U value than timber or uPVC with the same glass. Frame type U-Value (W/m2 . K) Hardwood window 1.9 Aluminium without thermal break 6.6 Aluminium with thermal break (25 mm Polyamide) 2.2 uPVC frame 1.3 

Luminaire in daylighted areas greater than 25 m2 shall be provided with either an automatic or manual control device that can dim/brighten the lights at least by 50%.

ECBC does not provide any requirements for luminance (Lux) levels. You should refer to National Building Code of India.

The Central Government through its Ministry of Non-Conventional Energy Sources provides soft loans for installation of domestic solar water heating systems. These loans are being provided through 7 Nationalized banks and the interest rate on the loans is 5%. The details of the scheme can be obtained from this website under "soft loan programme on solar water heating system”

Domestic solar water heaters work on the principle of thermosyphonic action in which water circulates through the system by virtue of density difference between hot and cold streams. No electricity is required for circulation of water or for any other operation in such systems. However, in case a back up heater is provided to take care of hot water requirement during cloudy days, electricity will be required. 

Typical solar water heaters made using materials as per BIS specifications could last for 15 -20 years depending upon the general upkeep, etc. 

The table below gives approximate likely electricity and money savings for typical 100 liters per day solar water heating systems located in different parts of the country. Likely savings of electricity and money by use of a 100 liters domestic solar water heater (using 2.0 sq.m collector area)

 

Northern Region

Eastern Region

Southern Region*

Western Region*

Expected no. of days of use per year

 

200 days

200 days

250 days

250 days

Expected yearly electricity saving with use of full capacity, kwh

 

950

850

1200

1300

 

Monetary savings at diļ¬€erent prices of electricity, Rs/year

 

Rs. 4/kwh

3800

3400

4800

5200

Rs. 5/kwh

4750

4250

6000

6500

Rs. 6/kwh

5700

5100

7200

7800

* The use pattern and savings for southern region pertains to the typical climate of Bangalore, while those for western region relate typically to Pune climate

ECBC has 5 components. Namely:

  1. Building Envelope
  2. Lighting
  3. Heating Ventilation & Air Conditioning(HVAC)
  4. Service Hot Water (SHW)
  5. Electricity consumption.

Energy optimization of these 5 components are considered together in ECBC to optimize reduce the electricity consumption in the building.

Building envelope consists of anything that separates the interior and exterior of the building. It consists typically of walls, doors, windows, roofs, etc.

You can have the building oriented in such a way to facilitate sufficient daylight and ventilation, thus reducing the dependency on the electrical systems.

By use of insulating building materials, the energy consumption by various electrical devices can be reduced even more.

Usage of high performance/ insulated glasses in the fenestrations according to the climatic conditions of the region and location of the fenestrations 

Yes. With some modifications (of nominal expenses) your structure can be made ECBC compliant.

No. The same lighting system with some modifications can be upgraded to ECBC standards. And furthermore, any alteration in the lighting system will be economical in the long run.

You can change the lighting as per the prescriptive directives of the codes. 

ACs with higher coefficient of performance & EER should be preferred, but it does not mean you need to change your AC. Simple building modifications can result in improved performance.

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