Adopting Low-cost Alternative for Energy Saving
Energy Saving Potential

This section showcases the energy conservation measures in a low energy design building. The Energy Conservation Measures considered here are ECBC compliant building applied to envelope, Lighting and HVAC Design. The overall energy saving potential from the following design strategies are quantified under the project “High Performance Commercial buildings in India”:

  • 1.ECBC Envelope
  • 2.Energy Efficient Lighting Design
  • 3.Energy Efficient HVAC Design

For more information on the ECBC envelope, refer Technical Information Section.

ECBC Envelope

Wall

roof

glazing

U-value : 0.391 W/m2°C

U-value : 0.385 W/m2°C

U-value : 2.22 W/m2°C

ECBC Compliant lighting design

Lighting Power Density*

Daylight integration

Window Wall Ratio

L.P.D = 6 W/m2

Daylight integration

(20- 30)%

ECBC Compliant HVAC Design

Chiller

AHU

Motor

Centrifugal water cooled chiller COP = 6.3 or EER = 21.49

All AHUs designed for variable air volume with temperature based economizer

Variable speed drive

   

Impact of Energy Conservation Measures - 4 design Strategies:

Energy Performance Index of a low energy day use building with above mentioned energy conservation measures is in the following range:

Day use Building

24 Hours use Building

Lighting: 18 (kWh/m2/annum)
HVAC: 39 (kWh/m2/annum)
EPI of the building (including lighting & HVAC
consumption only): 57 (kWh/m2/annum)

Lighting: (kWh/m2/annum)
HVAC: (kWh/m2/annum)
EPI of the building (including lighting & HVAC
consumption only): (kWh/m2/annum)

   
ENERGY SAVING POTENTIAL: 69%** (IN COMPARISON TO CONVENTONAL BUILDING CASE)
ENERGY SAVING POTENTIAL: 66%** (IN COMPARISON TO CONVENTONAL BUILDING CASE)

It is also observed in air-conditioned buildings for both day use and 24 hour-use, ECBC compliant envelope + efficient lighting with daylight integration & optimum WWR has high energy saving potential. Energy simulation engine was used to quantify energy saving potential in a daytime office and 24 hour buildings. The below graphs shows the reduction in energy consumption in a day time and 24 hour-use buildings by adopting low energy strategies;

Fig 1: Energy saving potential due to ECBC complaint envelope + Energy Efficient lighting + Energy Efficient HVAC Design with optimum WWR
   

**Note: The energy saving potential of Energy Conservation Measures (ECM4), is calculated with ECBC complaint envelope + ECBC complaint lighting + ECBC complaint HVAC Design with optimum WWR strategies against Base case (conventional building).

From the graph below it is also observed that by just using efficient HVAC there is 40% reduction in the total EPI for day use buildings.
   
 
   

Life Cycle Cost Analysis:

The Life Cycle Cost Analysis (LCC) of this energy conservation measure by using ECBC complaint envelope, Energy Efficient lighting and Energy Efficient HVAC Design with daylight integration and optimum WWR was carried out under this project. The LCC of this case in day use buildings considering 25 yrs is 1023 Million Rs. The Pay back for incorporating the solar passive design strategies is found out to be as3yrs.

     
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