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Energy Management with the use of an Intelligent Building Management System

Energy Management with the use of an Intelligent Building Management System. Focus. Basic Concept of Intelligent Building Management System How an intelligent BMS can be applied on Energy Management in large size commercial buildings. Basic Concept of Intelligent Building Management System.

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Energy Management with the use of an Intelligent Building Management System

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  1. Energy Management with the use of an Intelligent Building Management System

  2. Focus • Basic Concept of Intelligent Building Management System • How an intelligent BMS can be applied on Energy Management in large size commercial buildings

  3. Basic Concept of Intelligent Building Management System • What is BMS? (computer?) • Instruments • PC + software • Network • Controller

  4. Building Management System(Past, Present, Future) • Recorder • Information Technology System (ITS) • data monitoring, implementation & transfer • Artificial Intelligent System (ATS) • self-learning, diagnosis

  5. What is the duties of BMS ? • Reporting - information print out • Monitoring - provide message / signal /alarm • Prediction - cooling demand, energy • Control - program, schedule • Diagnosis - analysis

  6. Information Flow in BMS • signal • data • graphic • models • program • Y = mx + c • y = ao + a1x + a2x2

  7. Advantages in using BMS in Building Facilities Management • Operation • Centralize , Program, Automate, Remote • flexible, save operation & maintenance cost • Maintenance • reactive  proactive (monitor, keep checking) • increase services quality level (SQL) • Applicable to Energy Management

  8. Operation ON/OFF equipment by IR-sensor Signal - occupants zoning & scheduling by BMS program ON/OFF/reset output Automation Maintenance Fault identification of VAV boxes Signal - damper position, temperature abnormal data presented in BMS Output - message Manpower saving O&M Examples

  9. Energy Management in Building(how to use BMS in EM?)

  10. What is Energy Management Energy Audit Data Analysis Identify Energy Saving Opportunities Implementation Measurement & verification (M&V) Evaluation

  11. Energy Management & BMS • Energy audit • Data Analysis • Identify saving • Implementation • M&V • Evaluation

  12. Example - 1Chilled Water Supply Temperature Reset (CityPlaza) • CHWST - summer 6.5°C ; winter 7.5 °C • Reset CHWST in according to outdoor condition

  13. Idea

  14. Use of BMS • Data collect & analysis - outdoor temperature, chiller performance, CHW supply & return temperature • Algorithm programmed in BMS • Output - CHW supply temperature reset value • Verify the energy saving from data recorded in BMS

  15. Investment Modify control logic program in BMS Benefit Programmable predictable and verified Fully Automatic negligible additional investment & maintenance cost Investment vs Benefit

  16. Example 2Free Cooling by Outdoor Air (Taikoo Place) • Constant amount of outdoor air intake • Amount of outdoor air intake in according to the air temperature between outdoor & indoor

  17. Idea • Air temperature outdoor < indoor  extra cooling capacity • More Outdoor Air & Less Return Air • Cooler intake air before cooling coil  less cooling demand

  18. Control Strategy • Air temperature Outdoor < Indoor • Adjusting the dampers position of outdoor air and return air

  19. Investment Motorized damper program in BMS Benefit Estimated saving HK$120,000/yr Negligible additional maintenance cost Fully automation Investment vs Benefit

  20. Example 3Carpark Ventilation Control Based on Actual CO level (CityPlaza) • Any air quality problem? • Fans are operated in 2 speed • High speed 7:00 – 23:00 • Low speed 23:00 – tomorrow 7:00

  21. Idea • Installation of CO monitoring system • BMS used to trend the CO conc. profile • EPD requirement vs actual CO conc. (gap) • Possibility to reduce fan speed

  22. Implementation Strategy(Original & 1st trail)

  23. Implementation Strategy(2nd & 3rd trail)

  24. Use of BMS • Data collect & analysis - CO level • Fan schedule programmed in BMS • Output - Fan ON/OFF in high / low speed

  25. Investment Initial cost is HK$560,000 Maintenance cost is HK$42,000/yr Benefit Estimated annual saving is HK$970,000 Automation Health & Acceptable IAQ level Investment vs Benefit

  26. Example 4Optimal AHU/PAU Start Up Time in A/C System

  27. Background • Office Tower A/C hour 08:00-19:00 • AHUs start at 07:00 / 07:30 for pre-cooling • PAUs start with AHU • BMS to control the A/C system

  28. Idea • PAU (Fresh Air) • Office hours usually start at 09:00 • Delay the PAU starting time? • AHU (Cooling) • Office space temp. vary with outdoor temp. • Desire the optimum start up time of AHU to just meet the cool down period?

  29. Average Outdoor Temp at 08:00

  30. Outdoor Temp. 280C 230C 180C Time 07:00 07:25 07:50 AHU Control Strategy

  31. Outdoor Temp. > 18 0C DB Outdoor Temp.  18 0C DB ON ON OFF Time OFF Time PAU (09:00) AHUs (07:00-07:50) PAU/AHUs (07:50) PAU Control Strategy

  32. Use of BMS • Feedback signal • outdoor temperature • Programming in BMS • Output - AHU/PAU start up time

  33. Investment • Hardware - None • Software • BMS contractor to write a program to incorporate into the PAU/AHU control • Initial cost - HK$11,600.00

  34. Benefit • Yearly saving about HK$160,000 • equivalent to 96,000kg CO2 emission for coal-fired power generation • Fully automatic • No O&M cost

  35. Example 5Optimal Static Pressure Reset in Variable Air Volume A/C System 2002 Hong Kong Eco-Business Awards Green Innovative Practice ‘Gold’ Award

  36. CityplazaTaikoo Shing • Built in 1997 • Grade A office with over 50000m2 • HK BEAM -Excellent rating

  37. Schematic Diagram of VAV System P - Pressure sensor , D - Control Damper, VSD - Variable speed Drive

  38. Use of BMS • Feedback signal • 32 nos VAV damper position • Programming in BMS • Output - main duct pressure

  39. Static Pressure Profile Light Load AHU On

  40. Investment • Hardware • added a control unit • Software • BMS contractor to write a program according to designed control logic • Initial cost - HK$69,400.00

  41. Benefit • Yearly saving is about HK$200,000 • equivalent to 120,000kg CO2 emission for coal-fired power generation • VAV boxes re-commissioned • noise reduced at part load • assist in VAV fault diagnosis • Fully automatic

  42. Future Development • Fruitful quality of information • Web base performance • Self learning • fault detection and diagnostic

  43. Thank You!

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