REAL OPERATING COST SAVINGS FROM RETRO- COMMISSIONING OPPORTUNITIES FOR SAVINGS IN ACADEMIC MEDICAL CENTERS

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1 REAL OPERATING COST SAVINGS FROM RETRO- COMMISSIONING OPPORTUNITIES FOR SAVINGS IN ACADEMIC MEDICAL CENTERS Ken L. Hansen P.E. University of Nebraska Medical Center

2 LEARNING OBJECTIVES Understand the motivation and methods for accomplishing retro-commissioning Identify several areas of improved operations by retro-commissioning Identify operating savings from tuning damper and valve controls Identify operating savings from control sensor location and variable speed drive control How to review operating schedules to identify savings How to look at the right parameters to adjust operating algorithms to achieve energy savings ASHRAE is a Registered Provider with The American Institute of Architects Continuing Education Systems. Credit earned on completion of this program will be reported to ASHRAE Records for AIA members. Certificates of Completion for non-aia members are available on request. This program is registered with the AIA/ASHRAE for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product. Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation.

3 ACKNOWLEDGEMENTS I would like to extend my sincere gratitude to the UNMC facility management team, the Omaha Public Power District team, the Bes- Tech engineering team, the RDH engineering team and various mechanical and electrical service teams contributing to the success of these projects and to the success of UNMC s strategic goals.

4 OUTLINE/AGENDA University of Nebraska Medical Center Strategic Energy Plan Goals Retro-commissioning case study in the Michael F. Sorrell Center built in 2008 Hybrid retro-commissioning case study in the University of Nebraska Medical Center Tower 4 inpatient facility Conclusions/Results

5 MICHAEL F. SORRELL CENTER RETRO-COMMISSIONING

6 MICHAEL F. SORRELL CENTER RETRO-COMMISSIONING BUILDING INFORMATION Center for Health Science Education Total floor area: 134,000 square feet Constructed in 2008 Full scale retrocommissioning and optimization for whole HVAC system

7 MICHAEL F. SORRELL CENTER RETRO-COMMISSIONING HVAC INFORMATION One hundred eleven (111) VAV terminal boxes Twenty seven (27) fan powered boxes Eleven (11) fan coil units Two (2) chilled water pumps for each AHU-1 and AHU-2 One (1) steam-hot water heat exchanger Two (2) hot water pumps for terminal reheat

8 MICHAEL F. SORRELL CENTER RETRO-COMMISSIONING BUILDING CHALLENGES Hot and cold complaints on a daily basis Building static pressure issues related to the skywalk connection to Wittson Hall Simultaneous heating and cooling Building chill water pressure issues with the central utility plant Occupied/ Unoccupied control issues

9 MICHAEL F. SORRELL CENTER RETRO-COMMISSIONING SYSTEM HVAC OPTIMIZATION Minimum air flow is dynamically set based on the zone occupancy status The maximum heating airflow is set between 30%-50% of maximum cooling airflow based on zone heating requirement Supply air static pressure is dynamically set Supply fan speed is modulated to maintain SSP set point using VFD power output

10 MICHAEL F. SORRELL CENTER RETRO-COMMISSIONING SYSTEM HVAC OPTIMIZATION (CONT.) Return fan speed is modulated to maintain constant air flow differential between SF and RF to maintain slightly positive building pressure using VFD power output Supply air temperature reset Mixed air temperature reset Economizer is enable when outside air enthalpy is lower than return air enthalpy

11 MICHAEL F. SORRELL CENTER RETRO-COMMISSIONING SYSTEM HVAC OPTIMIZATION (CONT.) Chilled water system pumps The loop DP is reset from minimum to maximum based on the load Pump speed is controlled to maintain loop DP Hot water system The pump speed is controlled to maintain the pump head at its set point The pump head is reset from minimum to maximum based on the load

12 MICHAEL F. SORRELL CENTER RETRO-COMMISSIONING RESULTS Minimal comfort complaints Improved system reliability Energy savings Electricity 1.1 M kwh (66%) Demand 95.9 kw Heating 20,190 Therm (32.5%) Cost savings: $99,724/year utility cost reduction: < 1 year simple payback

13 UNIVERSITY TOWER 4 HYBRID RETRO-COMMISSIONING

14 UNIVERSITY TOWER 4 HYBRID RETRO-COMMISSIONING BUILDING INFORMATION University of Nebraska Medical Center Tower 4 Total floor area: 245,691 square feet Constructed in 1969 Hybrid retrocommissioning and optimization for HVAC system

15 UNIVERSITY TOWER 4 HYBRID RETRO-COMMISSIONING HVAC INFORMATION Twenty (20) dual duct air handling units Numerous pneumatic constant volume terminal boxes Legacy control system for main air handlers Existing actuators and valves past end of useful life 50% of cooling coils in need of replacement Three (3) chilled water pumps

16 UNIVERSITY TOWER 4 HYBRID RETRO-COMMISSIONING BUILDING CHALLENGES Continuous hot and cold complaints daily Building static pressure issues Simultaneous heating and cooling Building low delta T Intensive maintenance costs in patient care and service areas High energy costs

17 UNIVERSITY TOWER 4 HYBRID RETRO-COMMISSIONING SYSTEM HVAC OPTIMIZATION Optimization similar to the Michael F. Sorrell building

18 UNIVERSITY TOWER 4 HYBRID RETRO-COMMISSIONING HYBRID UPGRADES TO MINIMIZE CAPITAL COSTS Installation of VFDs to implement new air flow measurement technologies Installation of hot deck dampers Replace air handling control system Replace 50 % of the cooling coils Replace valves and actuators Repair and re-commission pneumatic boxes Commission the overall system

19 MICHAEL F. SORRELL CENTER RETRO-COMMISSIONING RESULTS Minimal comfort complaints Reduced 4 FTEs : $260,000/year Energy savings Electricity 1.2 M kwh (38%) Demand 102 kw Heating 27,977 Therm (35%) Cooling 585,234 Tonhr Cost savings: $243,079/year utility cost reduction

20 MICHAEL F. SORRELL CENTER RETRO-COMMISSIONING RESULTS Project costs: $1,000,000 Project simple payback based on energy costs: 4.1 years Project simple payback based on energy and labor costs: 2.0 years

21 UNMC ENERGY SAVINGS 2010/2013 RETRO-COMMISSIONING

22 CONCLUSIONS RETRO-COMMISSIONING VARIES BASED ON SPECIFIC ORGANIZATIONAL STRATEGIES AND BUILDING DYNAMICS Depends on available capital and useful life Depends on engineering and building technologies BOTTOM LINE IS RETRO-COMMISSIONING DELIVERS BOTH ENVIRONMENTAL AND FINANCIAL RESULTS

23 KEN HANSEN

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