1 / 22

Seminar Meeting 11/2013

Seminar Meeting 11/2013. Christopher Price Component Level HVAC Control NIST Project. Overview. Motivation Background Cascaded Control Air Volume Systems Hydronic Radiators Future Work. Motivation. DMPC Control Project (NIST) Advanced control algorithms to generate system set points

joanna
Download Presentation

Seminar Meeting 11/2013

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. Seminar Meeting 11/2013 Christopher Price Component Level HVAC Control NIST Project

  2. Overview • Motivation • Background • Cascaded Control • Air Volume Systems • Hydronic Radiators • Future Work

  3. Motivation • DMPC Control Project (NIST) • Advanced control algorithms to generate system set points • Reduced energy consumption and cost through improved efficiency • Full energy savings when components have adequate tracking

  4. Motivation • Where I Fit

  5. Background • Vapor Compression Cycle (2010) Eliot & Rasmussen: On Reducing Evaporator Superheat Nonlinearity

  6. Background • Expansion Valves Capillary Tube Automatic Expansion Valve Thermostatic Expansion Valve http://image.ec21.com/image/zjwanjie/OF0008152543_1/Sell_capillary_tube_with_nut.jpg http://neilorme.com/pics/aev1.jpg http://www.swtc.edu/Ag_Power/air_conditioning/lecture/expansion_valve.png

  7. Background • Hybrid Expansion Valve (2009) Eliot & Rasmussen: Evaporator Superheat Regulation Via Emulation of Semi-Active Flow Control

  8. Cascaded Control • Block Diagram

  9. Cascaded Control Valve Position to Mass Flow Mass Flow to Pressure Mass Flow to Superheat (2009) Eliot & Rasmussen: Evaporator Superheat Regulation Via Emulation of Semi-Active Flow Control

  10. Air Volume Systems • Apply same control idea to air handlers • Two main types: • Constant Volume Systems • Flow rate constant, temperature varied • Variable Air Volume Systems* • Varied flow rate, temperature constant

  11. VAV Systems • Schematic

  12. VAV Systems • Damper Types Parallel Blade Opposed Blade Single Blade 2009 ASHRAE Handbook Fundamentals Arrow United Industries

  13. VAV Systems • Damper Characteristics Parallel Blade Opposed Blade 2009 ASHRAE Handbook Fundamentals

  14. VAV Systems • Traditional PID vs. Cascaded Control

  15. VAV Systems • Simulation Model • Damper Model (2010) Yamakawa: Compensation of Manual Reset for PID Controller

  16. VAV Systems – Traditional PID Control

  17. VAV Systems – Cascaded Control

  18. Hydronic Radiators • Shown cascaded control works for refrigerant and air mediums • Apply control design to water radiator systems • Currently working on validating results from Tahersima 2013 paper

  19. Hydronic Radiators • Equations • Radiator: • Room: • Valve: (2013) Tahersima: Analytical Solution for Stability-Performance Dilemma for Hydronic Radiators

  20. Hydronic Radiators • Motivation (2013) Tahersima: Analytical Solution for Stability-Performance Dilemma for Hydronic Radiators

  21. Future Work • Study the effect of sampling rate on performance of cascaded loop • Proper tuning of cascaded loop control • Application of cascaded control to positive displacement components (fans/pumps) • Alternate control structures (e.g. feed forward control)

  22. Questions?

More Related