Adopting Low-cost Alternative for Energy Saving
Energy Saving Potential

This section showcases the energy conservation measures in an ECBC compliant building. The Energy Conservation Measures considered here are ECBC compliant building applied to envelope, Lighting 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: 17 (kWh/m2/annum)
HVAC: 47 (kWh/m2/annum)
EPI of the building (including lighting &
HVAC consumption only): 64 (kWh/m2/annum)

Lighting: 46 (kWh/m2/annum)
HVAC: 117 (kWh/m2/annum)
EPI of the building (including lighting &
HVAC consumption only): 164 (kWh/m2/annum)

   
ENERGY SAVING POTENTIAL: 67%** (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 in a day use building Energy saving potential due to ECBC complaint envelope + Energy Efficient lighting + Energy Efficient HVAC Design with optimum WWR in a 24-hour use building
   

**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 32.2% reduction in the total EPI for day use buildings and 26% for 24-hour use buildings
   
Fig 3: Impact of using efficient HVAC on EPI
   

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 optimum WWR was carried out under this project. The LCC of a day use building case considering 25 yrs 1031 Million Rs and the Pay back is found out to be as less than 2 yrs. The LCC of a 24hr use building case considering 25 yrs 1031 Million Rs and the Pay back is found out to be as less than 1 year.

     
opyright 2010. All rights reserved by HPCB Privacy Policy