Energy Audit Baseline & Economic Analysis. Mr. Jirayut Charoenchatchai Manager,Energy Efficiency Div. Bright Management Consulting Co.,Ltd.

Transcription

1 Energy Audit Baseline & Economic Analysis Mr. Jirayut Charoenchatchai Manager,Energy Efficiency Div. Bright Management Consulting Co.,Ltd. Page 1

2 Content Energy Audit Approach Criteria for Data Collection as Baseline Energy Example of Energy Conservation Measures Economic Analysis Page 2

3 Energy Audit Approach Page 3

4 An energy audit is the key to a systematic approach to decision-making in the area of energy management. The primary function of an energy audit is to identify all of the energy streams in a facility in order to balance total energy input with energy use. The four main objectives of an energy audit are as follows: To establish an energy consumption baseline; To quantify energy usage according to its discrete functions; To benchmark with similar facilities under similar weather conditions; and To identify existing energy cost reduction opportunities. (Source : Page 4

5 ASHRAE Level 1 Walk-Through Analysis/Preliminary Audit ASHRAE Level 2 Energy Survey and Analysis ASHRAE Level 3 Detailed Analysis of Capital Intensive Modifications Level 1 Level 2 Brief on-site survey of the building Savings and cost analysis of low-cost/no-cost Energy Conservation Measures (ECMs) Identification of potential capital improvements meriting further consideration More detailed building survey Breakdown of energy use Savings and cost analysis of all ECMs Identification of ECMs requiring more thorough data collection and analysis (Level 3) Level 3 Attention to capital-intensive projects identified during the Level 2 audit More detailed field analysis More rigorous engineering analysis Cost and savings calculations with a high level of accuracy Page 5

6 (Source : Page 6

7 Energy Audit Approach Step 1 : Historical Data Review Step 2 : Quick check of energy index vs standard/benchmarking Step 3 : Explore energy breakdown by major system Step 4 : Walk-through survey to identify energy conservation measures (ECMs) Step 5 : Calculate potential ECMs Step 6 : Recommend next actions Detailed energy audit/ Investment Grade Audit? Implementation? Page 10

8 Energy Audit Approach Step 1 : Historical Data Review Step 2 : Quick check of energy index e.g. Baht/MJ, MJ/ton of production, Load factors Step 3 : Explore energy breakdown by major system Step 4 : Walk-through survey to identify energy conservation measures (ECMs) Step 5 : Calculate potential ECMs Step 6 : Recommend next actions Detailed energy audit? Implementation? Page 11

9 Energy Audit Approach Step 1 : Historical Data Review Step 2 : Quick check of energy index vs standard/benchmarking e.g. Baht/MJ, MJ/ton of production, Load factors etc. Step 3 : Explore energy breakdown by major system Step 4 : Walk-through survey to identify energy conservation measures (ECMs) Step 5 : Calculate potential ECMs Step 6 : Recommend next actions Detailed energy audit? Implementation? Page 12

10 Energy Audit Approach Step 1 : Historical Data Review Step 2 : Quick check of energy index vs standard/benchmarking e.g. Baht/MJ, MJ/ton of production, Load factors etc. Step 3 : Explore energy breakdown by major system Step 4 : Walk-through survey to identify energy conservation measures (ECMs) Step 5 : Calculate potential ECMs Step 6 : Recommend next actions Detailed energy audit? Implementation? Page 13

11 Energy Audit Approach Step 1 : Historical Data Review Step 2 : Quick check of energy index e.g. Baht/MJ, MJ/ton of production, Load factors Step 3 : Explore energy breakdown by major system Step 4 : Walk-through survey to identify energy conservation measures (ECMs) Step 5 : Calculate potential ECMs Step 6 : Recommend next actions Detailed energy audit? Implementation? Page 14

12 Energy Audit Approach Site Energy Flows Page 15

13 Energy Audit Approach Building Energy Flows Page 16

14 Energy Audit Approach Step 1 : Historical Data Review Step 2 : Quick check of energy index e.g. Baht/MJ, MJ/ton of production, Load factors Step 3 : Explore energy breakdown by major system Step 4 : Walk-through survey to identify energy conservation measures (ECMs) Step 5 : Calculate potential ECMs Step 6 : Recommend next actions Detailed energy audit? Implementation? Page 17

15 Energy Audit Approach Step 1 : Historical Data Review Step 2 : Quick check of energy index e.g. Baht/MJ, MJ/ton of production, Load factors Step 3 : Explore energy breakdown by major system Step 4 : Walk-through survey to identify energy conservation measures (ECMs) Step 5 : Calculate potential ECMs Step 6 : Recommend next actions Detailed energy audit? Implementation? Page 18

16 Energy Audit Approach Page 19

17 Energy Audit Approach Step 1 : Historical Data Review Step 2 : Quick check of energy index e.g. Baht/MJ, MJ/ton of production, Load factors Step 3 : Explore energy breakdown by major system Step 4 : Walk-through survey to identify energy conservation measures (ECMs) Step 5 : Calculate potential ECMs Step 6 : Recommend next actions Detailed energy audit? Implementation? Page 20

18 Energy Audit Approach Energy Balance, Mass Balance In = Out + Losses Page 21

19 Energy Audit Approach Step 1 : Historical Data Review Step 2 : Quick check of energy index e.g. Baht/MJ, MJ/ton of production, Load factors Step 3 : Explore energy breakdown by major system Step 4 : Walk-through survey to identify energy conservation measures (ECMs) Step 5 : Calculate potential ECMs Step 6 : Recommend next actions Detailed energy audit? Implementation? Page 22

20 Energy Audit Approach General industries Estimated energy saving (%) Using high-efficiency motor 2-5% Variable Speed Drive adjustment (VSD) 30-50% Boiler Economizer Measure 1-5% Waste heat recovery of air compressor 80% High-efficiency air compressors 5-20% High-efficiency boilers 10-15% Insulation 20-30% Food/steel/paper/non-metal industries Estimated energy saving (%) Usings Heat Exchanger/Regenerator/ 10-50% Recuperator/Recuperative Burner/Regenerative Burner/Waste Heat Boiler Installation of cogeneration system 30-40% Calculated by using Rules of thumb? % saving refer from Case studies? Neglected error from Estimation of energy parameters? Page 23

21 Energy Audit Approach Step 1 : Historical Data Review Step 2 : Quick check of energy index e.g. Baht/MJ, MJ/ton of production, Load factors Step 3 : Explore energy breakdown by major system Step 4 : Walk-through survey to identify energy conservation measures (ECMs) Step 5 : Calculate potential ECMs Step 6 : Recommend next actions Detailed energy audit / Investment Grade Audit? Implementation? Energy Management? Page 24

22 Criteria for Data Collection as Baseline Energy Page 25

23 Criteria for Data Collection as Baseline Energy Energy Usage profiles / Load profiles Operating hours Performance vs load Page 26

24 Criteria for Data Collection as Baseline Energy Page 27

25 Criteria for Data Collection as Baseline Energy Page 28

26 Example of Energy Conservation Measures (ECMs) Page 29

27 Example of Energy Conservation Measures (ECMs) Inefficiency & Waste? Page 30

28 Example of Energy Conservation Measures (ECMs) (Source : Procedures for commercial building energy audit (2 nd Edition), Page 31

29 Example of Energy Conservation Measures (ECMs) Inefficiency & Waste? Page 32

30 Example of Energy Conservation Measures (ECMs) Inefficiency & Waste? (Source : Procedures for commercial building energy audit (2 nd Edition), Page 33

31 Example of Energy Conservation Measures (ECMs) Inefficiency & Waste? (Source : Procedures for commercial building energy audit (2 nd Edition), Page 34

32 Example of Energy Conservation Measures (ECMs) Inefficiency & Waste? (Source : Procedures for commercial building energy audit (2 nd Edition), Page 35

33 Example of Energy Conservation Measures (ECMs) Analyzed energy saving potential Annual Energy and Cost Savings Payback with Incentive Measure Number EEM-1 EEM-2 EEM-3 EEM-4 EEM-5 EEM-6 EEM-7 EEM-8 Measure Description Replace Incandescent Lamps with CFLs Reduce Pressure Setting on Pneumatic Compressor Install VFD on Tenant Condenser Loop Pump to Reduce Flow Install VFD and Implement Demand- Controlled Ventilation for AHU-1 Install CO Sensors and VFD to Control Garage Exhaust Fan Add Hot-Water Resets Control and Install Condensing Boiler Replace Garage HPS Fixtures with LED Fixtures with Integrated Motion Sensor Repair Economizers on All Air Handlers Peak Demand Savings (kw) Electricity Savings (kwh) Gas/Fuel Savings (therms) Total Cost Savings Measure Cost Potential Utility Incentive ,245 - $ 1,906 $ 1,875 $ 545-2,312 - $ 206 $ - $ ,872 - $ 25,188 $ 17,386 $ 13,110-12, $ 2,290 $ 11,136 $ 1, ,948 - $ 8,811 $ 25,616 $ 3,916-44,838 17,203 $ 25,274 $ 102,511 $ 20, ,854 - $ 4,114 $ 29,598 $ 2, ,342 - $ 2,904 $ 12,864 $ 2,511 Measure Life (years) Net Measure Cost IRR (over Life of Measure) NPV* Simple Payback (yr) $ 1, % $ 3, $ - N/A $ $ 4, % $ 200, $ 9,718 20% $ 8, $ 21,700 39% $ 49, $ 81,721 31% $ 261, $ 27,423 12% $ 18, $ 10,354 12% $ 2, Page 36

34 Example of Energy Conservation Measures (ECMs) Q : Are there any ECMs missing.? A : Yes, there is ECM need to be considered during machine being moved or replaced Page 48

35 Example of Energy Conservation Measures (ECMs) Page 49

36 Example of Energy Conservation Measures (ECMs) Page 50

37 Example of Energy Conservation Measures (ECMs) Page 51

38 Economic Analysis Page 52

39 Economic Analysis Simple Payback Period (SPP) Net Present Value (NPV) Internal Rate of Return (IRR) Saving to Investment Ratio (SIR) Total Life Cycle Cost (TLCC) Detailed Cost Analysis to ensure valid economic analysis e.g. installation cost, O&M cost, re-investment cost etc. Page 53

40 Economic Analysis Matrix of Evaluation Criteria Selection: Page 54

41 Economic Analysis Level of Efficiency (1) Efficiency (2) Initial Cost ($) (3) Annual kwh (4) (5) Annual ($) Energy Cost Life ($) -PV (6) Total Life Cycle Cost ($)-PV (7) Net Savings ($) (8) Payback Period (9) SIR 70% (Existing) 0 9, ,041 15,041 0 n/a n/a 75% 300 7, ,678 11,978 3, % 450 7, ,051 11,501 3, % 650 6, ,658 11,308 3, % 800 6, ,500 11,300 3, % 1,000 6, ,382 11,382 3, Page 55

42 Conclusion Page 56

43 Resources Precedures for Commercial Building Energy Audit Energy audit guide A guide to Energy Audit, USDOE Page 57

44 Q&A Thank you for your attention Page 58