1 / 29

Energy Saving DDC Control Strategies

Energy Saving DDC Control Strategies. DDC Controls Architecture. Operator Interface Level. SQL Server. BACnet. Ethernet LAN. Building Control Level. BCU. BCU. MP581. AH541. ZN521. CH530. Unit Control Level. VV550. LonTalk. Energy Saving Control Strategies for VAV Systems.

nizana
Download Presentation

Energy Saving DDC Control Strategies

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Energy Saving DDC Control Strategies

  2. DDC Controls Architecture Operator Interface Level SQL Server BACnet Ethernet LAN Building Control Level BCU BCU MP581 AH541 ZN521 CH530 Unit Control Level VV550 LonTalk

  3. Energy Saving Control Strategies for VAV Systems • Optimum Start/Stop • Fan Pressure Optimization • Supply Air Temperature Reset • Demand Controlled Ventilation

  4. Optimum Start/Stop • Lowers system run time • Increases occupancy comfort Tracer Summit Optimal Start

  5. Optimum Start/Stop

  6. Fan Pressure Optimization • Fan Outlet Static Control (Good) • Supply Duct Static Control (Better) • Critical Zone Reset (Best) ASHRAE 90.1 Prescriptive Path

  7. Fan Outlet Static Control sensor locatedat fan outlet static pressure sensor VAV terminal units supply fan

  8. Fan Outlet Static Control Sample Case

  9. Supply Duct Static Control sensor located2/3 down supply duct static pressure sensor VAV terminal units supply fan

  10. Supply Duct Static Control Sample Case

  11. Critical Zone Reset sensor locatedat fan outlet static pressure sensor supply fan VAV terminal units communicating BAS damper positions fan speed

  12. Critical Zone Reset Sample Case

  13. Fan Pressure Optimization fan static pressure fan input power % full-load power control method airflow full load 100% 24,000 cfm [11.3 m3/s] 22 hp [16.4 kW] 2.7 in. H2O [672.5 Pa] part load 18,000 cfm [8.5 m3/s] 60% 2.1 in. H2O [523.1 Pa] 13 hp [9.7 kW] fan outlet supply duct 55% 12 hp [8.9 kW] 18,000 cfm [8.5 m3/s] 1.9 in. H2O [473.3 Pa] optimized 1.5 in. H2O [373.6 Pa] 18,000 cfm [8.5 m3/s] 43% 9.5 hp [7.1 kW]

  14. surge Fan Pressure Optimization duct static pressure control static pressure 1000 rpm 900 rpm potential savings 800 rpm fan-pressure optimization airflow

  15. Fan Pressure Optimization • Advantages • Reduced supply fan energy • Lower sound levels • Reduced risk of fan surge

  16. Supply Air Temperature Reset • Advantages • Lower compressor and reheat energy • Increased economizing time • Disadvantages • May increase fan energy • Increased humidity level • Key to success: • Combine as a balanced approach with fan pressure optimization

  17. Basic Control Model Example SAT Reset, Pressure Optimization, Opt Start

  18. Demand-Controlled Ventilation • Methods of Ventilation: • Fixed Damper position • OA method (min at design) • ASHRAE method (min at worst case) • Flow Control • Ventilation Reset

  19. Demand-Controlled Ventilation • What kind of energy saving should you expect?

  20. Demand-Controlled Ventilation • How do I save more energy? • The right tools • CO2 sensors • Occupancy sensors • TOD schedule • Advantages • Ensures compliance with ASHRAE 62.1 • Reduce outside air during low occupancy • Decreases reheat energy • LEED EQ Credit 1: Outdoor Air delivery monitoring

  21. LEED Credit Possibilities • EA Prereq 1 – Commissioning • EA Prereq 2 – Minimum Energy performance • EQ Prereq 1 – Minimum IAQ performance • EA Credit 1 – Optimize Energy Performance through energy simulation • EQ Credit 1 – Outdoor air delivery monitoring • EQ Credit 2 – Increased Ventilation • EQ Credit 6.2 – Controllability of systems: Thermal Comfort • EQ Credit 7.1 – Thermal Comfort: Design

  22. Chiller Plant Optimization • Chilled Water Reset • Increasing chilled water temp to reduce compressor energy • Increases pumping energy • Plant optimization • Weighing the energy use of CT vs. Chiller vs. Pumps • COP Weight

  23. Chiller Plant Optimization Modeled Example

  24. Energy Management • “Intelligent Building” • Building Dashboards • Demand Control

  25. Energy Management

  26. Energy Management

  27. Retro-Commissioning • The Easiest Energy Saver • Building Operators Changes • How To Stay On Top Of This

  28. Constant Reporting

  29. Thank You! References: Trane Engineering Newsletters http://www.trane.com/Commercial/DNA/View.aspx?i=5 Intelligent Buildings Roadmap (CABA) http://www.caba.org/trm BuildingLogiX Images http://www.buildinglogix.net/ecorate http://energy.buildinglogix.net/blxenergy/index.html

More Related