Building with ECBC compliant envelope. U-value Energy Saving : Potential W/m 2.4% 2 Energy Saving Potential 4.61% Roof. finish.

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1 ECM4 MEASURES 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 low energy design strategies, refer Technical Information Section. ECBC Envelope wall Building Building with with ECBC roof ECBC compliant compliant envelope envelope Building with ECBC compliant envelope glazing Energy Saving Energy Potential Saving 1.85% Potential 1.85% Energy Energy Saving Saving Potential Potential 2.4% 2.4% Energy Saving Potential 4.61% 4.61% U-value Energy : Saving Potential W/m 2 C 1.85% U-value Energy Saving : Potential W/m 2.4% 2 Energy Saving Potential 4.61% C U-value : 2.22 W/m 2 C Wall Wall Wall 230 mm brick 230 mm brick 230 mm brick External External External + 250mm brick + 250mm + brick 250mm brick finish finish finish coba coba coba Internal cement Internal cement Internal cement plaster Internal ceiling plaster plaster + Internal plasterceiling Internal ceiling + + plaster plaster 75mm expanded 75mm polystyrene expanded 75mm expanded polystyrene polystyrene U-Value W/m2/deg U-Value K U-Value Roof Roof U-Value W/m2/deg U-Value K U-Value External External External stone stone stone finish finish finish 75 mm expanded Polystyrene mm mm expanded expanded Polystyrene Polystyrene 250mm RCC 250mm RCC 250mm RCC Glass Glass Glass Double Double glazing glazing glazing U-Value 2.22 VLT W/m2/deg U-Value K 2.22 SHGC-0.25 VLT U-Value 2.22 VLT WWR SHGC % SHGC-0.25 WWR 30% WWR 30%

2 ECM4 MEASURES ECM4 MEASURES ECBC Compliant lighting design Lighting Power Density* L.P.D = 6 W/m 2 Daylight integration Daylight integration Window Wall Ratio (20-30)% The LPD considered is lower than ECBC recommended. ECBC Compliant HVAC Design Chiller AHU Motor Centrifugal water cooled chiller COP = 6.3 or EER = All AHUs designed for variable air volume with temperature based economizer Variable speed drive

3 EPI 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 Lighting: (kwh/m 2 /annum) HVAC: (kwh/m 2 /annum) EPI of the building (including lighting & HVAC consumption only): (kwh/m 2 /annum) 24 hours building Lighting: 46.3(kWh/m 2 /annum) HVAC: 87(kWh/m 2 /annum) EPI of the building (including lighting & HVAC consumption only): 133.3(kWh/m 2 /annum) ENERGY SAVING POTENTIAL: 67.47%** (IN COMPARISON TO CONVENTONAL BUILDING CASE) ENERGY SAVING POTENTIAL: 70.8%** (IN COMPARISON TO CONVENTONAL BUILDING CASE)

4 E nergy use (kwh) 1,600,000 E nerg y us e in B as e c as e and E C B C c ompliant c as e (E nvelope+l P D+HVAC ) 1,400,000 1,200,000 1,000, , ,000 Saving potential 64.5% Saving potential 70.8% 400, ,000 0 Base case (WWR 60% ) E CBC case (WWR 30% ) Base case (WWR 60% ) E CBC case (WWR 30% ) 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 32.2% reduction in the total EPI for day use buildings and 26% for 24-hr use buildings.

5 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 daylight integration and optimum WWR was carried out under this project. The LCC of this case considering 25yrs is 962 Million Rs. The Pay back for incorporating the solar passive design strategies is found out to be as 2 years. The LCC of this case considering 25yrs is 2676 Million Rs. The Pay back for incorporating the solar passive design strategies is found out to be as 1 year.

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