Presenters: Bob Kilgore Matthew McReynolds Brenna Goode CHEMISTRY BUILDING RCX

Project History

The Challenge? PH 1 Starts PH 2 Ends FLOOD

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

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

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

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

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

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

AHU Testing It’s All about building trust Verify actuator extents and mid-point stroke positions Verify sensor installation and accuracy 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 Processes

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

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

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

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

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

Chilled Water System Pumping Capacity Building Chilled Water Users Findings

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

Historical Weather data

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. 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. Findings Unit is running at approximately 60% full design capacity.

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. Recommendations

Results ECM-11

Results

Recommendations

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

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

reduce the reheat load: reset the AHU Discharge air set points upward when dehumidification is not necessary ECM-4 Discharge Air Temperature set Point Reset Room NumberSpace Use Description Teaching Laboratory W254Lab Equipment Room W76Lab Analytical Room W182Research Lab W174Research Lab E127A-1Core Collegiate Lab W290AClassroom Projection Room E236Electrical Closet W338Lab Computer Server Room W344 Class Lab Preparation Room W428 W444Classroom Laboratory E303Research Lab (Dry) E309Research Lab (Dry) W436Collegiate - Special Procedures Individual spaces identified Majority of concerned spaces currently have supplemental cooling systems

ECM-6/ECM-12 Teaching Lab Occupancy Air Flow Reset User Discussion 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

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

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

ECM-8 Decommission Unused Fume Hoods This measure identifies the savings potential of decommissioning Individual Fume Hoods Scope Would Include- 1.Shut off the exhaust VAV Terminal at Each hood 2.Fully close hood and Secure sash 3.Visually Identify Hood as being Decommissioned and cannot be used 4.Rebalance Room Airflows to maintain pressure requirements User Discussion

ECM-8 Decommission Unused Fume Hoods Five Rooms Identified E124W100W105W109W147E124W100W105W109W147 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 seen when mechanical cooling is active (chilled water available). Spaces will remain within standards for thermal comfort. User Discussion

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. Decommission Existing AHU Dehumidification Sequence User Discussion

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

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

Questions?

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