1. RTF RTUG Update Aug 12, 2010 “The Turn of the Screw” Premium Ventilation Extended Monitoring Reid Hart, PE Associate Director Technical Research Group

2. Premium Ventilation Fan Cycling DCV Research Funded by: Bonneville Power Administration Incentive Partners: EWEB & ETO

3. Premium Ventilation Package Savings – Not Yet Updated DOE2 based analysis

4. Program-wide Savings Distribution The histogram of probability for different savings results based on the full range of baseline influences and combinations: There is a VERY WIDE spread of savings results

5. Significant Ventilation Improvements Fan in “auto” During January, little daytime operation CO 2 concentration almost triple desired After retrofit, highest CO 2 concentration within target limits. Single return air sensor worked for multiple rooms: –Computer lab –Billiard room

6. Excessive CO 2 Peaks Eliminated (peak hour/month) Premium Vent Installation

7. Occurrences View Movement from pre more into desired range

8. Manufacturing Office No significant increase in CO 2 Premium Vent Installation

9. Electronic Controls are as Accurate as a “Screw Turn” Very difficult to adjust accurately –Solid state controllers require a voltage generator during setup to properly adjust DCV setpoints –Matching sensor range and output to the controller is non-trivial Minimums require guesswork Need “Contractor TAB”

10. Thermostats Succeptable to Occupant Setings Continuous fan operation during much of post period

11. Daily Energy Use Patterns Took a cold spell to fix it VSD fan has lower use

12. Its Time for Stand-Alone DDC Its time to let the low cost, 35 year old solid-state economizer controllers go. Just too many wires up on the roof. A combined programmable thermostat with BACnet DDC controller is now here at a reasonable price from multiple manufacturers.

13. DCV Integrated Fan Control (DCV-IFC) Sequence Improvements –Occupancy Sensor based setpoint and ventilation –Duty cycling would circulate air at least every 30 minutes –Stand-alone demand reduction –Allow night flush cooling Advantages of DCV-IFC –Interface with any staged rooftop unit with an economizer, –With the fan off when not needed less damper leakage –Greater savings than VSD power reduction at low speed –Lower cost as no VSDs and associated wiring or motor upgrades are required. –Higher reliability, as electronic economizer (solid-state) controls are replaced with digital logic. –Ventilation monitored and controlled

14. PORTLAND ENERGY CONSERVATION, INC. © California Commissioning Collaborative Questions? Reid Hart 503-961-6142 x324 rhart@peci.org