David Podorson’s scientific contributions

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Publications (1)


Figure 1. Network Switches in an Embedded Data Center. ........................................................ 20 Figure 2. Flow of Electricity from the Data Center to the PoE Devices. ..................................... 21 Figure 3. Center of Energy and Environment Minneapolis Offices in the Colonial Warehouse Building. ................................................................................................................................... 28 Figure 4. Monitoring Equipment in the CEE Electrical Panel. ................................................... 29 Figure 5. Ethernet Cables Leading from Network Switch to PoE Lights. ................................... 29 Figure 6. Packet Power Cable and Onset HOBO Datalogger. .................................................... 30 Figure 7. Light Measurements Were Performed in Each Cubicle. .............................................. 31 Figure 8. Signify Ledalite PoE Luminaire and Legacy T8 Fixtures. ........................................... 31 Figure 9. Floor Plan and Photo of the PoE and Legacy Lighting Systems in the CEE Administrative Office. .............................................................................................................. 32 Figure 10. Original AC-Powered Workstation (left) and the ThinLabs PoE All-in-One Quad Core Computer (right). .............................................................................................................. 33 Figure 11. Original AC-Powered Thin Client with Two External Monitors. .............................. 34 Figure 12. PoE Thin Client with AC-Powered Two External Monitors. ..................................... 34 Figure 13. South View Middle School. ...................................................................................... 35 Figure 14. Electrical Panel at SVMS. ........................................................................................ 36 Figure 15. Floor Plan of the PoE and Control Lighting Systems in the SVMS Classrooms. ....... 37 Figure 16. Classroom with Pre-Renovation T8 Fluorescent Lamp Fixtures................................ 38 Figure 17. Room A211 with PoE 2x2 Troffers. ......................................................................... 38 Figure 18. Room A212 with AC-Powered 2x4 Troffers............................................................. 39 Figure 19. Using the Light Meter Station to Measure Light levels in the SVMS Classrooms. .... 39 Figure 20. Light and Power Measurements of the Edina SVMS Line Voltage and PoE Classrooms. .............................................................................................................................. 40 Figure 21. Power use profiles for each system over a typical day in winter and spring. The winter profile is for January 15th, 2019. The spring profile is for April 16th, 2019. .............................. 41 Figure 22. Breakdown of non-effective and effective power at different lighting levels in a PoE system. ...................................................................................................................................... 42 Figure 23. Comparison of average monthly power use for each classroom during illuminated and dark periods. ............................................................................................................................. 42 Figure 24. 10Zig PoE Thin Client Workstation in the SVMS Media Center. ............................. 43 Figure 25. The Intel Compute Stick (left) and Chromebox Workstations (right) in the SVMS Media Center. ........................................................................................................................... 43 Figure 26. Intel Compute Stick on the SVMS Media Center Workstation. ................................. 44 Figure 27. Chromebox on the SVMS Media Center Workstation............................................... 44 Figure 28. DMTS Offices with Original 2x4 T8 Fluorescent Troffers. ....................................... 45 Figure 29. DMTS Offices with Ubiquiti Light Panels at Uniform (left) and User Specified (right) Brightness. ................................................................................................................................ 45 Figure 30. DMTS Closed Office Cree 2x4 Troffers. .................................................................. 46 Figure 31. The Sinclair Hotel in Fort Worth, TX. ...................................................................... 48 Figure 32. Floor Plan of a King Suite and Double Queen Guest Rooms in the Sinclair. ............. 49 Figure 33. Interior of Sinclair Hotel Guest Rooms, Double Queen and King Rooms, Respectively. ............................................................................................................................ 50 Figure 34. Sinclair Guest Room Bathroom with SmartMirror and Digital Shower System. ........ 50
Figure 4. Monitoring Equipment in the CEE Electrical Panel.
Figure 5. Ethernet Cables Leading from Network Switch to PoE Lights.
Figure 6. Packet Power Cable and Onset HOBO Datalogger.
Figure 7. Light Measurements Were Performed in Each Cubicle.

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The Demonstration of Power over Ethernet (PoE) Technologies in Commercial and Institutional Buildings
  • Technical Report
  • Full-text available

April 2023

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206 Reads

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Robert Lysholm

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David Podorson

Power over Ethernet (PoE) technologies are currently ubiquitous in offices in the form of phones, access points, and IP security cameras. They are systems that are familiar to and managed by on-site IT staff. As low voltage DC-power capabilities have increased with the advancement of IT network switches within offices, PoE devices are now being integrated across additional building systems, including lighting, computers, and HVAC controls. The connection of PoE devices to network switches offers the opportunity for energy monitoring and management to be performed through IT network management software. Data and results from technology validations of PoE equipment remain very limited. This lack of information hinders expansion of PoE as an energy management strategy as its benefits and challenges have been insufficiently quantified in real-world scenarios. This final report presents the findings of a DOE/State of Minnesota-funded project that demonstrated and assessed the energy and non-energy benefits of Power over Ethernet (PoE) technologies at six sites: two offices, three schools, and a hotel. The goals of the demonstrations were to: (1) assess the receptiveness of commercial and institutional markets to these new technologies, (2) demonstrate the feasibility of PoE technologies within standard design/construction practices and commercial codes, (3) assess the energy and cost savings opportunities of these technologies, (4) provide energy management opportunities where not typically available, and (5) formulate approaches to spur adoption of these technologies in the marketplace.

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