Chemistry Building RCx

1. Chemistry BuildingRCx Presenters: Bob Kilgore Matthew McReynolds Brenna Goode

2. Project History

3. The Challenge? PH 1 Starts PH 2 Ends FLOOD

4. Utility & Energy Use 7,945,346 kWh 26% Increase 5,827,190 kWh

5. Utility & Energy Use 40,956 MMbtu 36,467 MMbtu 11% Decrease

6. Utility & Energy Use 46,900 MMbtu 196% Increase 15,828 MMbtu

7. Utility & Energy Use 46,900 MMbtu 26% Difference Due to Excess Flow 37,268 MMbtu

8. Utility & Energy Use How Did Chemistry Compare? PH 1 Starts PH 2 Ends FLOOD Labs21 Benchmark Data

9. Processes Fume Hood Testing Over 250 Hoods Currently Operational • Verify sash velocities at multiple positions • Compared to most recent EHS testing reports • Verify current hood use

10. Processes AHU Testing • Verify actuator extents and mid-point stroke positions • Verify sensor installation and accuracy It’s All about building trust When we can trust the BAS to give us good data, we utilize the trends to analyze the systems for deficiencies and opportunities This is also the basis for a Continuous Commissioning program

11. Findings Improve Averaging Sensor Coverage T T T T Existing Recommended Improvement • Improves sensing and therefore control (adding temp sensors) • Reduces risk of freezing coils (adding freeze stats) It’s pretty cheap insurance!

12. Findings AHU Heat Recovery Control Single point of control for heat recovery creates one satisfied AHU and three unsatisfied AHUs

13. Findings Chilled Water System Investigation • AHU Control Sequences • AHU Coil Capacities • Pumping Capacity • Historical Weather Data

14. Findings Chilled Water System • AHU Control Sequences Reduce Discharge Air Temperature Based on Return/Exhaust Humidity Level. +3°F 50°F 47°F 52°F 55°F

15. Findings Chilled Water System • AHU Coil Capacities Modeling showed Air Handling Units are driven beyond coil capacity. Coils sized for 51.6°F (LAT) @ 89°F / 78°F Program Demands 47°F(LAT) @ 89°F / 78°F Coil Physically can’t meet DAT requirements

16. Findings Chilled Water System • Pumping Capacity Building Chilled Water Users

17. Findings Chilled Water System • Historical Weather data Data From University of Iowa Chilled water Plant PI System

18. Findings • Historical Weather data

19. Findings AHU-NW Discharge Air Temperature Sensor • Discharge air sensor was found to be reporting 5°F high. • Resulting in Cooling Coil being overdriven and Heating Coil Under driven.

20. Findings • Sensor Calibration Northwest AHU chilled water valve was consistently at 100% while the discharge air temperature struggled to maintain set point. Unit is running at approximately 60% full design capacity. Unit is running at approximately 60% full design capacity.

21. Recommendations ECM-11 Fix AHU-NW Discharge Air Temperature Sensor • Recalibrate DAT sensor to read true value of conditioned air. • This measure was implemented during study.

22. Results ECM-11

23. Results ECM-11

24. Recommendations

25. Uncertainty of purpose Unrealistic solutions Overly burdensome implementation Impact on research and instrumentation Impact on the instructional mission User Concerns

26. Recommendations 7 of 13 ECMs required coordination with building users and lab equipment:

27. ECM-4 Discharge Air Temperature set Point Reset • reduce the reheat load: reset the AHU Discharge air set points upward when dehumidification is not necessary • Individual spaces identified • Majority of concerned spaces currently have supplemental cooling systems

29. User Discussion ECM-6/ECM-12 Teaching Lab Occupancy Air Flow Reset • Modify Control Sequence to Reduce Ventilation and hood exhaust Rate Setpoints during Unoccupied Hours • Reduce Minimum Room Airflow to 4 ACH and hood air flow to NFPA minimum

30. User Discussion ECM-6/ECM-12 Teaching Lab Occupancy Air Flow Reset • Minimum Turndown Capabilities of VAV’s • Temperature Control Infrastructure Confirmed through sample of Shop Drawings • Add Controllers (Nae) • Each Room Program Individually Modified • Reviewed Viable Timeframes Winter And Spring Break

31. User Discussion ECM-7 Reduce Minimum Laboratory Ventilation Rate During Occupied Hours • Modify Control Sequence to Reduce Ventilation Rate Setpoints during Occupied Hours in Classroom Laboratories. • Reduce Minimum Room Airflow to 6 ACH

32. User Discussion ECM-7 Reduce Minimum Laboratory Ventilation Rate During Occupied Hours • Minimum Turndown Capabilities of VAV’s • Temperature Control Infrastructure

33. User Discussion ECM-8 Decommission Unused Fume Hoods • This measure identifies the savings potential of decommissioning Individual Fume Hoods Scope Would Include- Shut off the exhaust VAV Terminal at Each hood Fully close hood and Secure sash Visually Identify Hood as being Decommissioned and cannot be used Rebalance Room Airflows to maintain pressure requirements

34. User Discussion ECM-8 Decommission Unused Fume Hoods Five Rooms Identified E124 W100 W105 W109 W147

35. User Discussion ECM-10 Decommission AHU Dehumidification Sequence • Remove program to reset DAT down based on return air humidity. • Impact To Building Occupants: • Building humidity levels may increase from values currently seenwhen mechanical cooling is active (chilled water available). Spaces will remain within standards for thermal comfort.

36. User Discussion Decommission Existing AHU Dehumidification Sequence Impact To Building Occupants: • Building humidity levels may increase from values currently seen. Spaces will remain within standards for thermal comfort. Risks Associated with Implementation: • Areas requiring specific environmental humidity levels may need supplemental dedicated dehumidification equipment.

37. User Discussion

38. User Discussion ECM-13 Reduce Humidification Set Point • Lower humidification set point from 30% to 20% RH • Based on equipment environmental tolerances, this measure was not implemented.

39. Engaged building participants; early and often Free-flow of information Responded quickly to concerns Took time to learn Actual Implementation

40. Questions?

41. Thank You