Case study of an ECBC Compliant, Energy Efficient Building: Aranya Bhawan, Jaipur

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1 Case study of an ECBC Compliant, Energy Efficient Building: Aranya Bhawan, Jaipur Prashant Bhanware (BEEP) 2 nd REGIONAL WORKSHOP ON ECBC IMPLEMENTATION IN STATES March 15 & 16, 2017 Hyatt, Ahmedabad

2 Outline of the Presentation About Indo-Swiss Building Energy Efficiency Project (BEEP) Overview of BEEP charrettes Case study: Aranya Bhawan, Jaipur Learnings 2

3 Indo-Swiss Building Energy Efficiency Project (BEEP) Phase I: Phase II: To assist Government of India in mainstreaming thermally comfortable and energy efficient building design in India 3

4 Indo-Swiss Building Energy Efficiency Project (BEEP) Building Design Design support to large building projects Building Technology Energy Efficient Building Envelope Building Policy Design Guidelines for Residential & Public Buildings Training & Information Trainings, Seminars, Web, 4

5 Energy Efficient Building Design Technical support to18 building projects (IT buildings, hospital, offices, residential complexes, academic institutions,..) >1.4 million m 2 built-up area 25-40% estimated energy savings Hospital Educational campus Residential township World Trade Centre Office & Retail complex Training institute & govt. office 5

6 Energy Consumption Integrated Design Charrette Approach for ECBC Compliance 100% Business As Usual Passive Measures (Orientation, WWR, glazing, Shading, Insulation, natural ventilation, daylight ) Active Measures (Free cooling, ERW, Evap. Cooling, Chiller selection & operation, innovative technologies, ) On-site Renewable Energy Generation Net Energy Minimize heat gain, Maximize Daylight Efficient HVAC & lighting system 6

7 Integrated Design Charrette Approach for ECBC Compliance Integrated Design during Early-Design Phase 7

8 What is Energy Performance Index (EPI)? Renewable electricity Grid Electricity Main Meter Total electricity (kwh/y) DG Electricity Built-up area (m 2 ) Built-up area: Total built-up area excluding the basements used for services and/or parking Source: BEE Star rating for Office Building & BEE Star rating for BPO 8

9 P U B L I C O F F I C E, B E N G A L U R U A R A N Y A B H A W A N, J A I P U R I I I D E M, N E W D E L H I M I X E D - U S E D E V E L O P M E N T, P U N E M I X E D - U S E D E V E L O P M E N T, B E N G A L U R U W O R L D T R A D E C E N T E R ( W T C ), G A N D H I N A G A R P R I V A T E O F F I C E B U I L D I N G, B E N G A L U R U M I X E D U S E D E V E L O P M E N T, N O I D A I N T E R N A T I O N A L T R A I N I N G C E N T R E, P U N E S Y M B I O S I S U N I V E R S I T Y O F A P P L I E D S C I E N C E S, I N D O R E M I T U N I V E R S I T Y, U J J A I N J U P I T E R H O S P I T A L, P U N E EPI of BEEP Charrette Projects: Commercial Buildings ESTIMATED ENERGY PERFORMANCE INDEXES OF CHARRETTE PROJECTS Energy Performance Index (EPI) - kwh/m2.y Before Charrette Energy Performance Index (EPI) - kwh/m2.y After Charrette PUBLIC OFFICE BUILDING PRIVATE OFFICE/IT BUILDING TRAINING EDUCATIONAL INSTITUTE HOSPITAL 9

10 Click to edit Master title style CASE STUDY: ARANYA BHAWAN, JAIPUR 10

11 Jaipur: Climate Jaipur 11

12 Aranya Bhawan Aranya Bhawan is the new office building of the Rajasthan Forest Department in Jaipur, inaugurated in March Built-up area: ~10,000 m 2 (excluding basement parking and service area) Number of floors: Five (G+4) + one basement for parking and services Number of users: ~350 Types of spaces: Offices, museum, library, auditorium, guest rooms 12

13 Aranya Bhawan: Project Timeline December March Design Charrette Construction Technical support by BEEP Inauguration Energy Monitoring Client: Rajasthan Forest Department Executing Agency: Rajasthan State Road Development and Construction Corporation Ltd. (RSRDC) Architects: Mathur, Ugam and Associates 13

14 Aranya Bhawan: Passive Measures Roof Insulation U-value: 0.6 W/m 2.K Wall Insulation Reduction in Glazed Area Double-Glazed Windows U-value: 1.8 W/m 2.K SHGC: 0.24 VLT: 36% U-value*: 0.5 W/m 2.K 14

15 Reduction in Cooling System Size 250 Cooling system size (TR) % reduction Before the charrette After charrette 15

16 Aranya Bhawan: Cooling System Water Cooled Energy Efficient Chiller (using water after waste water treatment) 16

17 Aranya Bhawan: Solar Energy Generation Grid connected rooftop solar PV Capacity: 45 kwp (annual production: ~60,000 kwh) 17

18 Aranya Bhawan Energy Monitoring Detailed monitoring of 2 weeks in Winter (Jan.16) & 2 weeks in Summer (May.16) + Monthly electricity bills for 1 year 18

19 Monitoring results Aranya Bhawan Winter (Nov-Feb) Miscellaneous 4% HVAC 0% Annual Energy Consumption STP 10% Lighting 17% Lighting 6% Office Equipment 69% HVAC 53% Office Equipment 31% STP 3% Miscellaneous 7% Summer (Mar-Oct) Break-up of HVAC energy consumption Lighting 5% AHU 15% HVAC 60% Office Equipment 26% STP 2% CT Fan 4% Condenser Pump 12% Secondary Pump 10% Chiller 54% Miscellaneous 7% Primary Pump 5% 19

20 kwh/m 2.month Electricity Consumption: Simulation & Actual (EPI) Monthly EPI Comparison: Simulated vs. Actual Simulated EPI Actual EPI Actual EPI: 43 kwh/m 2.year BEE 5 star benchmark: 90 kwh/m 2.year May-15 Jun-15 Jul-15 Aug-15 Sep-15 Oct-15 Nov-15 Dec-15 Jan-16 Feb-16 Mar-16 Apr-16 20

21 Aranya Bhawan: Overall Cost and Performance Summary 21

22 ECBC Compliance Buildings applying for ECBC Compliance Meet Mandatory Provisions Prescriptive Method Whole Building Performance Method All building components need to comply the code individually Envelope Trade-off Method Annual Energy Simulation of Whole Building Allows trade-off among envelope components (Wall, Roof & Fenestration) based on total Envelope Performance Factor EPF proposed EPF prescriptive kwh proposed kwh prescriptive Other building components need to comply the code individually 22

23 ECBC Compliance of Aranya Bhawan: Whole Building Performance Method ECBC Prescreptive* Proposed # Opaque Wall U-value (W/m 2.K) Roof U-value (W/m 2.K) Fenestration - SHGC - VLT - U-value (W/m 2.K) LPD ("building area method") (W/m 2 ) HVAC: Centralised system - Water cooled screw chiller (COP) - AHU 4.7 Constant volume Constant volume AHUs + FCUs *Day use office building in Composite climate; Glazing distributed in all 4 sides equally; Baseline model simulated for 0, 90, 180 & 270 degree orientation and average value taken # Same building operation assumptions (thermostat setpoints, schedules, internal gains, occupant loads, etc.); Finalized based on calibrated energy simulation model 23

24 kwh/y ECBC Compliance of Aranya Bhawan 6,00,000 5,00,000 4,00,000 5,13,657 Annual Energy Consumption An ECBC compliant building design: ~20% energy saving 4,04,554 Net Grid Electricity consumption to reduce by 60,000 kwh/y (Estimated generation from 45 kwp SPV system) 3,00,000 2,95,245 2,00,000 1,00,000 - ECBC Prescriptive (Simulated) Proposed (Simulated) Actual (Measured) 24

25 Learnings The approach for energy efficiency/ecbc compliance should always be reducing the demand first through passive measures, use efficient systems with controls and then integrate renewable energy system. Integrated approach at early design stage for energy efficiency results in 20-40% energy savings. Charrettes help in estimating the techno-economics of energy efficiency measures; helping in decision making and identifying acceptable measures for implementation; thus help in achieving ECBC compliance. 25

26 Click to edit Master title style To download BEEP publications, know about BEEP charrettes and to apply for a charrette, please visit THANK YOU!!! 26