1. Analysis of Chilled Water System Presented by 鴨子

2. Outline Introduction to Chilled Water System Motivation Outdoor Temperature Classification Analysis of Power Consumption for Three Hosts Analysis of Chilled Water Leaving Temperature Conclusion Future Work

3. 賴先生

4. Outline Introduction to Chilled Water System Motivation Outdoor Temperature Classification Analysis of Power Consumption for Three Hosts Analysis of Chilled Water Leaving Temperature Conclusion Future Work

5. Introduction to Chilled Water System

6. NTU CSIE Chilled Water System

8. Specification of Chilled Water System 冰水主機： 187 kW 冰水泵浦： 11.2 kW 冷卻水泵浦： 22.5 kW 區域泵浦 *2 ： 30 kW 冷卻水塔： 7.5 kW Total ： 258.2 kW ( 視在功率 )

9. Power Consumption of Chilled Water System

10. State of Chilled Water System Full load( 全載, 滿載 ) 240RT(refrigeration ton) 380V, 320A (181kW) Light load( 輕載, 基本載 ) 80RT 380V, 130A (72.7kW) Stop( 待機, 停機 ) 0RT 0V, 0A → but it never happened…… 1RT 是將 1 噸 0 ℃的冰溶化為 0 ℃的水 所吸收的熱量 (Kcal/hr or Btu/hr)

11. State of Chilled Water System Example : chilled water leaving temperature 7 ℃ chilled water leaving temperature of next time : 9 ℃ → Full load 6.5 - 9 ℃ → Light load – Full load about 6 ℃ → Stop

12. Electric Meter of NTU CSIE

13. 校園電力監視系統

15. Outline Introduction to Chilled Water System Motivation Outdoor Temperature Classification Analysis of Power Consumption for Three Hosts Analysis of Chilled Water Leaving Temperature Conclusion Future Work

16. Motivation The power consumption of chilled water system takes 40%~50% of all power consumption, but…… 假日 vs. 上課日 : 整天差 571.5 度 假日只比非假日省了 6% 天冷 vs. 天熱 : 整天差 588 度 天冷時只比天熱時省了 6.78% 凌晨 vs. 正常時段 : 一小時平均差 59 度 凌晨時段只比有人時段省了 14.17%

17. Motivation In these cases, we observe that chilled water system makes a big waste and some people feel very cool. We want to adjust the chilled water leaving temperature to save the energy and let everyone feeling comfortable.

18. Outline Introduction to Chilled Water System Motivation Outdoor Temperature Classification Analysis of Power Consumption for Three Hosts Analysis of Chilled Water Leaving Temperature Conclusion Future Work

19. Why Classify the Outdoor Temperature ? Under similar outdoor temperature conditions, comparing the power consumption between two days.

20. Outdoor Temperature Classification Source of Weather’s Data :  台灣大學大氣系  中央氣象局

21. Outdoor Temperature Classification DATA (unit :minute) Max. Min. Avg. temperature of a day Parse_day.cpp Avg. temperature of an hour Parse_hour.cpp Classify.cpp Classification

22. Classify.cpp 24hour Cold : % Mid : % Hot : % threshold : 20, 26 C :1 CM :2 M :3 MH :4 H :5 CH :6 CMH :7 Classification

23. C, M, H :  E.g. : (2, 18, 4) where (C, M, H) →M CMH :  E.g. : (7, 9, 8) where (C, M, H) →CMH CM,MH,CH :  E.g. : (11, 9, 4) where (C, M, H) →CM  E.g. : (11, 0, 13) where (C, M, H) → CH Classify.cpp

24. Weather Classification

25. Outline Introduction to Chilled Water System Motivation Outdoor Temperature Classification Analysis of Power Consumption for Three Hosts Analysis of Chilled Water Leaving Temperature Conclusion Future Work

26. Analysis of Power Consumption for Three Hosts

28. Host_3 (7 ℃ ) Host_1 (7 ℃ ) Host_2 (7 ℃ ) 3/24-3/303/10-3/164/07-4/13 (三)(三) (2)9353(1)9092(1)8922 (四)(四) (1)8821(1)9213(1)9347 (五)(五) (1)8702(2)9258(1)9408 (六)(六) (2)8258(1)8696(2)9061 (日)(日) (1)8110(4)8934(3)9086 (一)(一) (2)8610(3)9506(4)9713 (二)(二) (2)9013(1)9353(1)9541

29. Outline Introduction to Chilled Water System Motivation Outdoor Temperature Classification Analysis of Power Consumption for Three Hosts Analysis of Chilled Water Leaving Temperature Conclusion Future Work

30. Schedule of Chilled Water Leaving Temperature TargetLeaving Temperature Time Host_3 9℃9℃ 4/14( 三 ) – 4/20( 二 ) Host_1 12 ℃ 4/21( 三 ) – 4/27( 二 ) Host_2 9℃9℃ 4/28( 三 ) – 5/04( 二 ) Host_3 9℃9℃ 5/05( 三 ) – 5/11( 二 )

31. Analysis of Chilled Water Leaving Temperature

32. Host_2 (7 ℃ ) Host_2 (7 ℃ ) Host_2 (9 ℃ ) 3/17-3/234/07-4/134/28-5/04 (三)(三) (1)9326(1)8922(2)9268 (四)(四) (2)9365(1)9347(3)8857 (五)(五) (7)9430(1)9408(2)8739 (六)(六) (3)9040(2)9061(4)8295 (日)(日) (3)8931(3)9086(4)8472 (一)(一) (3)9541(4)9713(4)9129 (二)(二) (4)9848(1)9541(4)8652

33. Analysis of Chilled Water Leaving Temperature Host_3 (7 ℃ ) Host_3 (7 ℃ ) Host_3 (9 ℃ ) Host_3 (9 ℃ ) 3/03-3/093/24-3/304/14-4/205/05-5/11 (三)(三) (2)9428(2)9353(2)9050(4)8692 (四)(四) (3)9379(1)8821(1)8764(3)8601 (五)(五) (3)9452(1)8702(1)8584(3)8404 (六)(六) (3)8783(2)8258(3)8296(3)7555 (日)(日) (1)8232(1)8110(3)8355(3)7591 (一)(一) (1)8735(2)8610(4)9077(3)8285 (二)(二) (1)8669(2)9013(3)9358(3)8329

34. Schedule of Local Pump before 4/28( 三 ) 1 館 : auto 2 館 : auto 4/28( 三 )16:30 1 館 : 強制變頻 30%(29gpm) 2 館 : 強制變頻 60%(150gpm) (5/03( 一 )1 館 5F 陳教授反應太熱 ) 5/03( 一 )15:30 1 館 : 強制變頻 40%(46gpm) 2 館 : 強制變頻 50%(96gpm) 5/08( 六 )21:00 1 館 : 強制變頻 60%(80gpm) 2 館 : 強制變頻 50%(80gpm) GPM : Gallon per minute

35. Outline Introduction to Chilled Water System Motivation Outdoor Temperature Classification Analysis of Power Consumption for Three Hosts Analysis of Chilled Water Leaving Temperature Conclusion Future Work

36. Conclusion Host_3 spends less electricity than host_1, host_2 → Increase its work time! Adjusting the chilled water leaving temperature can decrease the cost of electricity. The rotation rate of local pump may have a big influence on chiller system’s cost.

37. Outline Introduction to Chilled Water System Motivation Outdoor Temperature Classification Analysis of Power Consumption for Three Hosts Analysis of Chilled Water Leaving Temperature Conclusion Future Work

38. Current Work From Chiller System - peripherals - chilled water leaving temperature - monitor

39. Future Work From Chiller System - peripherals - chilled water leaving temperature - monitor From User

40. Experiment Seminar Room Teaching Room Professor Room LAB Open the AC controller of all  Seminar Room & Teaching Room  at 6:00am - 8:00am