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Retrofitting existing Commerical Buildings for Smart Grid


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The Smart Grid is coming! But unfortunately most existing buildings cannot talk with the Smart Grid. Instead, most have pneumatic HVAC controls and lighting circuits that cannot respond to dynamic pricing signals or demand response events. Retrofitting them with conventional technologies is prohibitively costly and disruptive to occupants.

In this session, Harry Sim, CEO of Cypress Envirosystems, will discuss new retrofit solutions that cost up to 80% less, do not disrupt occupants, and have a very good payback.

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Retrofitting existing Commerical Buildings for Smart Grid

  1. 1. Making Dumb Buildings “Smart” Harry Sim CEO, Cypress Envirosystems V4.0 081114
  2. 2. “Smart” Buildings
  3. 3. Typical Existing Buildings Today Pneumatic Thermostats Dial GaugesSteam Traps Standalone Transducers, LED/LCD Displays -80C Freezers Uninterruptible Power Supplies Manual Instrumentation, Not Programmable, No Diagnostics… Equals: Wasted Energy, Higher Downtime, More Labor Required
  4. 4. Why Still So Many “Pneumatic” Buildings?• High Cost – Replace pneumatic piping with electrical wiring – Replace pneumatic actuators with electric actuators – Must go behind walls, above ceilings – Lots of labor – Market rate of $2500 - $3000 per zone for traditional DDC retrofit – Payback of 4-7 years typical• Disruptive to Tenants – Exposure to Potential hazardous/toxic materials (e.g. Asbestos) – Retrofits often happen only when there is tenant churn or other major renovation Most buildings built before 1995 are still pneumatically controlled, or up to 70% of the commercial built environment.
  5. 5. What are the Consequences?• Waste Energy – No zone control for night setback, occupancy override, optimal start/stop – No ability to participate in Auto-Demand response or similar load management strategies – Out of calibration stats do not control temperature correctly• More Labor for Maintenance – Manual calibration of pneumatics – Difficult to troubleshoot with no diagnostics, sensors• Unhappy Tenants – Building manager does not know of problem until tenant calls – Many thermostats set at maximum or minimum – do not function Real Impact to Energy Costs, Maintenance Costs, Tenant Satisfaction
  6. 6. Problem Right Here in Silicon Valley • County of Santa Clara, Social Services Administration • 2 Buildings, each 5 story, built 2000 • Total 300,000 sq-ft • 350 Pneumatic Thermostats, non-communicating • Estimated Demand Response load shed: 200kW • Would like to participate in PG&E Auto-DR program, but challenging with pneumatic thermostats
  7. 7. But Can’t We do Something?!!Silicon Valley Silicon Valley High Tech Built Environment 40 Year Gap in Technology Co-Existing in Same Area
  8. 8. New Technology to Enable Retrofit DDC in 20 Minutes!• Manual Setpoint Control • Remote Wireless Setpoint Control• No Remote Readings • Remote Monitoring of Temp & Pressure• No Diagnostics • Pager/Cell Notification of Excursions• Manual Calibration • Automatic Self-calibration Required • Programmable Temperature Setbacks• Cannot support Demand • Occupancy Override Response strategies • Enables Demand Response strategies • BACnet Interface to BMS • 2yr+ battery life Requires about 20% the cost and 10% of the time compared to traditional DDC Retrofit
  9. 9. Replacement in under 20 minutes
  10. 10. Project Comparison with DDC Retrofit Santa Clara County Government Project
  11. 11. Tapping Utility Auto-DR Incentives• Open A-DR communications link developed by Lawrence Berkeley National Labs.• PG&E Technical Incentive 2009: • $230/kW for equipment and installation • $20/kW for participant incentive • $50/kW for Technical Coordinator Incentives Can Help Pay for Cost of Retrofit
  12. 12. Automating Gauge Reading • Thousands of gauges on Air Handlers, Boilers, Chillers, Heat Exchangers… • Energy Savings Applications e.g. – Compressed Air – ramp down compressor – Audits for current, steam/water pressure, temp, flow • Improved Equipment Uptime via Monitoring – Filter changeouts (measure delta P) – Pumps, compressors, fans (measure delta P) • Reduced troubleshooting cost – Fast non-invasive data gathering/logging/alarming • Safety/Compliance – Avoid difficult to reach or hazardous locations – Monitor exhaust/venting (e.g. Magnehelic gauge) • Reduce labor and consumable costs – Gas Cylinders Non-Intrusive Reader Mounts On Top of Existing Gauge in Minutes…Enables Alarming, Trending, Historization for Process/Asset Monitoring and Troubleshooting
  13. 13. Detecting Steam Trap Leaks • Necessary part of the steam distribution system, usually hundreds of units per site • 15-20% average failure rate; leaks steam • Failed traps lose $5-10K per year • Wireless device clamps on non- invasively and monitors trap health for early detection and resolution. • Typically less than one year payback on investment.Leaking Traps Waste Energy Typical Steam Trap Save Energy and Time Locating Faulty Steam Traps
  14. 14. Connectivity to Existing Automation PC with Browser PC with Browser EthernetBAS Controller Honeywell Building Excel EBI, Wixom, M Solutions Golden V BACnet/IP Tridium Honeywell ECC Important to Work With Existing Automation… Avoid: New Headend, New Software, Retraining of Staff