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August 18, 2011 EPA ENERGY STAR National Building Competition Event                     First Unitarian Society           ...
August 18, 2011 EPA ENERGY STAR National Building Competition Event                     First Unitarian Society           ...
August 18, 2011 EPA ENERGY STAR National Building Competition Event                             First Unitarian Society   ...
August 18, 2011 EPA ENERGY STAR National Building Competition Event                           First Unitarian Society     ...
August 18, 2011 EPA ENERGY STAR National Building Competition Event                                First Unitarian Society...
Your Tour Guide● My name is Ken Duvio.● Since 1988, my Facilities Management  background includes many requests by buildin...
"You already have one of those.          Its just not hooked up."● When I first toured, the  Building and Grounds  committ...
The Lower Auditorium (LA):       85 degrees in Feb 2010?www.nfs-llc.com
Lower Auditorium (LA) was at 85 degrees in   February of 2010, set at 68 degrees.  ● First thing I responded to on    site...
The Upper Auditorium (UA)www.nfs-llc.com
Excess UA Heat CyclesCount the pink peaks (always on) and thepurple peaks (with fan turning off and on) www.nfs-llc.com
Motor Starters, Lower and Upper                      Auditorium Fans● In Year 1, we reduced the  motor run time by re-  en...
Heat Won’t Turn Off – Steam Valve Leak● Stage 1 and 2 of the Upper  Assembly Fan, an Air  Handling Unit (AHU)  accounting ...
"You’re lucky if you have control drawings at all."  www.nfs-llc.com
"By tracing and labeling air, electric, heating, return, and sensor  lines and devices, you can map your existing system -...
Outside Air/Return Air Adjustments● As mentioned, we had 50%  OA in the largest space in  deep winter, 25%  Downstairs in ...
Summer, Winter Adjustment● Found some return air  diluting our Free Cooling  operation, thus reducing  efficiency. Correct...
Overheating the Entry Foyer● Steam valve would not  close● Remade leaky control  air connection, replaced  diaphragm● Stil...
Adjusted Thermostats● I found most pneumatic  stats off by 5-8 degrees, and  recalibrated…● Only to discover control air  ...
Adjusted Thermostats● Most of these were just  buried on the highest  setting.● This Danfoss sensor  was hooked up to a  v...
Heating Valve Not Closing, Fan Coil 2● Smaller unit, harder to  figure this one – the  control air just wasn’t  there. Cha...
Heating Valve Wont Open, Fan Coil 1● FC 1 had several urban  legends I heard, including  reports that the steam lines  wer...
Condensate Return Temps● Tracing back from these  thermometers when they’re  showing in excess of 110  degrees (2 were in ...
Steam Traps● Once the leaky control  air lines are remedied;● And the steam valves  that won’t close all the  way are fixe...
Good Filter Maintenance - Economizing● Paper is cheaper than  metal. So is oil.● Note the outside air  dampers open during...
RTU Evaporator and Condensor Coils● These were well maintained  by the contractor.● I have seen MANY cooling  and condense...
Coil Cleaning● The AHU and Fan Coil heating  coils were clean, thus good  filter maintenance.● Here is a condenser coil fo...
Someone’s in the Kitchen● There was a piece of  fiberglass insulation  intermittently jamming  the contactor in the On  po...
Domestic Tap Water Heating● This unit short cycled a lot● Several issues – here’s a model  for all these investigations: w...
Line Timers on Window Units● Staff gets into the act!  Addition of timers to the  window unit power  cords keeps the AC of...
Programmable Thermostats● Basic 7 day, 4 period per day  programmable stats were  added to● LA (also enabling Free  Coolin...
Year 2 Capital Improvements:       Cutout Control, Boiler and Fans● Having established that with  simple repairs and  adju...
Cutout Control, Boiler and Fans:      Trending, Alerts, Internet Access● Alerts set up for Flame  Failure, Low Water, Low ...
Year 2 Capital Improvements:       Cutout Control, Boiler and Fans● On top of that conduit is an  outdoor air sensor. This...
Internet Programmable Controller for         Upper Assembly Fan:  Cutout, setback, scheduling, 2 stage heat, overnight coo...
"A fan in the open window on a cool fall,        summer, or spring night"● It was cheaper to have the  new digital control...
More on the UA Intervention● We went from 24 cycles  a day to 18 on a unit  that accounts for more  than 20% of the  build...
Live Time View of First Unitarian Society Upper Auditorium and Boiler Controls● These are read only,  and password  protec...
Cumulative Cost Savings                          Prepared by Bruce Nelson, PEwww.nfs-llc.com
Electricity Consumption Reduction                      Prepared by Bruce Nelson, PEwww.nfs-llc.com
Gas Consumption Reduction                       Prepared by Bruce Nelson, PEwww.nfs-llc.com
Energy Star Portfolio Manager Tracking                         Prepared by Bruce Nelson, PE  www.nfs-llc.com
Utility Audit RecommendationsThe find and fix work that earned immediate, cumulative and         durable savings was all c...
Other efforts                           ● Unique envelope response to old                             single glazed window...
Loving the Environment● First Unitarian Society of  Minneapolis has saved in the  contract period● 26090 kWh● 113 KW● 1068...
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First Unitarian Society of Minneapolis saves over $16,000 a year with energy-saving measures

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In May 2011, EPA launched the ENERGY STAR National Building Competition: Battle of the Buildings. In its second year, the Biggest Loser-style competition featured teams from 245 buildings across the country in a head-to-head battle to save energy and reduce greenhouse gas emissions. And guess who won in the House of Worship category? The First Unitarian Society of Minneapolis!

This presentation is an overview of their energy-saving measures. You can also read an interview with Bruce Nelson, a member of the congregation, about how they saved all that energy here: http://bit.ly/s3d09X.

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Transcript of "First Unitarian Society of Minneapolis saves over $16,000 a year with energy-saving measures"

  1. 1. August 18, 2011 EPA ENERGY STAR National Building Competition Event First Unitarian Society 900 Mount Curve Avenue Minneapolis, Minnesota 55403
  2. 2. August 18, 2011 EPA ENERGY STAR National Building Competition Event First Unitarian Society 900 Mount Curve Avenue Minneapolis, Minnesota 55403 Building and Grounds Committee for First Unitarian Society approved a performance based contract for classic recommissioning. Projects included: People-Power Find and Fix New Must Be Better
  3. 3. August 18, 2011 EPA ENERGY STAR National Building Competition Event First Unitarian Society 900 Mount Curve Avenue Minneapolis, Minnesota 55403 People-PowerPartnering with our most important resource to manage energy consumption – People. This includes: ● Planners and schedulers of room use to allow use to match occupancy, ● Building staff and Users who can be the caring eyes, ears and hands to observe and curb use (turning off hallway lights when adequate daylighting is present for example), ● Volunteers to help with building envelope issues, addition of timers on line loads, and reporting lighting, energy use, and climate issues.
  4. 4. August 18, 2011 EPA ENERGY STAR National Building Competition Event First Unitarian Society 900 Mount Curve Avenue Minneapolis, Minnesota 55403 Find and Fix● 24/7 fan operation now managed by stats.● Steam valves that never closed all the way were repaired, adjusted.● Elements in steam traps that were leaking were replaced.● Setback reactivated building wide, enhanced by schedule in large areas.● Control air leaks found and remedied reducing run time and heating shutoff issues.● Mixed Air adjustments were managed to occupancy.
  5. 5. August 18, 2011 EPA ENERGY STAR National Building Competition Event First Unitarian Society 900 Mount Curve Avenue Minneapolis, Minnesota 55403 New Must Be BetterAfter the existing systems were made functional and optimized, and savings immediately earned (within the first month), a new use benchmark was the target to beat through any refits, upgrades,modernizations. Many typical replacements and renewals had long term paybacks but adverse short term cash flow effect. An investment in Control additions was made for: ● one AHU that accounted for 20% of the building’s steam/heating use, enabling programmable scheduling and enhanced setback (went from 24 heating cycles a day on an avg 20 degree day to 18 per day on the pneumatic stat – under same OA temps, the unit now cycles avg 12 times per WEEK to warm up Thursday evenings and Sundays). ● a ‘smart’ cutout control for both the boiler (45 degree boiler cutout in Fall-Spring with 68 degree interior override), and main AHU fans (71 degree fan cutout in Summer). 3 year cost recovery predicted, trending at 2 years presently. ● Nocturnal Free Cooling function was added to 2 main AHU areas: thus climate comfort periods in this heating only plant was increased, along with fan run time in the fall-summer-spring. The energy savings would have been greater without this extra fan run time, but climate comes first.
  6. 6. Your Tour Guide● My name is Ken Duvio.● Since 1988, my Facilities Management background includes many requests by building principals to investigate and control energy costs locally, regionally, and nationally. I hold a bachelors degree from Tulane University, and certification in my profession.● I work as a consultant/teacher/technician, thus youll see me on site dressed as appropriate for the Boardroom, Workplace Tenants and Users, roofs, tunnels, ceilings, and equipment rooms.● The following slides offer a look at recommissioning finds, fixes and additions that have reduced energy and fuel consumption at First Unitarian Society of Minneapolis.● The comments are meant for a non technical audience, while providing info to your building technical and operating engineering staff.● I hope this will help to identify and recreate similar energy cost management work at your buildings. www.nfs-llc.com
  7. 7. "You already have one of those. Its just not hooked up."● When I first toured, the Building and Grounds committee was aware that the fans ran 24/7 from October to April.● I was asked initially to see if FUS could purchase some sort of starters to allow the pneumatic stats to turn the fans off and on with the heating (steam) valves.● I’m staring right at the pneumatic starter, original equipment, present on all main AHU’s, jumped out.● Easy fix, reconnected the control air off the stat www.nfs-llc.com branch to the steam valve
  8. 8. The Lower Auditorium (LA): 85 degrees in Feb 2010?www.nfs-llc.com
  9. 9. Lower Auditorium (LA) was at 85 degrees in February of 2010, set at 68 degrees. ● First thing I responded to on site while intending to get the fan starters hooked back up. Custodian mentioned the Cafeteria-Dining-Stage area was over 80 degrees. I thought, ok, we all exaggerate a little… then I walked in and measured 85. ● Blown diaphragm on the actuator, venting control air (compressor running excessively, some valves throughout the building probably not closing all the way) and thus unit was running full heat 24/7. ● Rebuilt the actuator, reseated the valve. $23 part. www.nfs-llc.com
  10. 10. The Upper Auditorium (UA)www.nfs-llc.com
  11. 11. Excess UA Heat CyclesCount the pink peaks (always on) and thepurple peaks (with fan turning off and on) www.nfs-llc.com
  12. 12. Motor Starters, Lower and Upper Auditorium Fans● In Year 1, we reduced the motor run time by re- enabling the existing pneumatic motor starters.● This was just the beginning. Datalogging recorders were showing wild readings from the heating coils, as if they never turned off.● And the outside air intake was running about 50% open in deep winter – imagine those fans running 24/7, blowing a heat cycle in the room to warm it, then blowing 50% of 20 below zero outside air, heating cycle to bring it back up, and repeat… expensive.● Parts costs – zero. Just reconnections, adjustments. www.nfs-llc.com
  13. 13. Heat Won’t Turn Off – Steam Valve Leak● Stage 1 and 2 of the Upper Assembly Fan, an Air Handling Unit (AHU) accounting for up to 20% of the building steam/heat consumption, would not close all the way.● Stage 1 (rear) remedied by a new diaphragm ($23.00 part).● Stage 2 (front) remedied by adjusting the valve stem length in the actuator.● Year 2 Digital Control – Stage 1 valve is primary, 2 opens only as needed to recover – we then ramp back to 50% to complete a heating cycle. www.nfs-llc.com
  14. 14. "You’re lucky if you have control drawings at all." www.nfs-llc.com
  15. 15. "By tracing and labeling air, electric, heating, return, and sensor lines and devices, you can map your existing system - this creates answers, and questions." www.nfs-llc.com
  16. 16. Outside Air/Return Air Adjustments● As mentioned, we had 50% OA in the largest space in deep winter, 25% Downstairs in LA. There were problems with the control air to the dampers… they were not hooked up to ever purge when the AHU shut down (and when the fan runs all the time…)● Some fittings, tubing, elbow grease, line tracing. Note labels in the lines, so techs in the future don’t have to untangle the birdsnest again www.nfs-llc.com
  17. 17. Summer, Winter Adjustment● Found some return air diluting our Free Cooling operation, thus reducing efficiency. Correction to control air pressure to the damper on the ‘cooling’ stage drove this full closed, OA full open. This saves fan run time.● Same but reverse adjustment applies in the winter: enough makeup air during max estimated occupancy (about 15% works, and then the fan shuts off and the OA dampers close to preserve the heating that the unit just performed. www.nfs-llc.com
  18. 18. Overheating the Entry Foyer● Steam valve would not close● Remade leaky control air connection, replaced diaphragm● Still overheating● Off season, pulled the valve assembly and discovered a bad valve seat. Replaced seat and valve stopper.● $40.00 rebuild kit bought on Ebay www.nfs-llc.com
  19. 19. Adjusted Thermostats● I found most pneumatic stats off by 5-8 degrees, and recalibrated…● Only to discover control air leaks to many of the radiator steam valve actuators due to dry rotted plastic tubing● And radiator valve actuator heads that were shattering in my hands, only to learn they weren’t the type rated for steam valve heat! Since construction: wrong actuator heads.● So once all that was fixed (head rebuild parts averaged $15-20 each) the stats were recalibrated again. www.nfs-llc.com
  20. 20. Adjusted Thermostats● Most of these were just buried on the highest setting.● This Danfoss sensor was hooked up to a valve head that was cracked, but dutifully tied back down to it’s seat by stainless steel wire, which had over time stretched and uncoiled at the twist-tie down spots to let the valve stay wide open and consume steam. www.nfs-llc.com
  21. 21. Heating Valve Not Closing, Fan Coil 2● Smaller unit, harder to figure this one – the control air just wasn’t there. Chased the line down with a pressure gauge until I got right up to the valve. Leaking at the seam, rebuilt the head. $15.00 part www.nfs-llc.com
  22. 22. Heating Valve Wont Open, Fan Coil 1● FC 1 had several urban legends I heard, including reports that the steam lines were capped to this unit years ago. Well, sometimes it heated, sometimes not.● The clip that holds the valve stem to the actuator head was undone. The stat was moving it, the steam line was active, it just wasn’t always pulling the valve open.● Ok, you’re looking 14 ft straight up, and wedging yourself 12 inches between hot steam and condensate lines to work on an actuator that’s over your head and horizontal so all the guts go flying across the room and down when it was taken apart. Not fun, but fixable! www.nfs-llc.com
  23. 23. Condensate Return Temps● Tracing back from these thermometers when they’re showing in excess of 110 degrees (2 were in the 220 range) might not always be the easiest thing to do. Shoot the return line from the steam trap in each radiator, down the line a bit if you can, with the IR thermometer.● One hard to find leak was actually the plastic head on a Danfoss valve that had split – another valve that never closed. Steam trap then needed replacement as well. www.nfs-llc.com
  24. 24. Steam Traps● Once the leaky control air lines are remedied;● And the steam valves that won’t close all the way are fixed● And the thermostats are calibrated● It’s time to look at the steam traps to ensure they’re not bleeding steam back into the condensate lines● An IR hand held thermometer can help identify these lines when hard to reach www.nfs-llc.com
  25. 25. Good Filter Maintenance - Economizing● Paper is cheaper than metal. So is oil.● Note the outside air dampers open during a summer day, 67 deg OA, thus we can cool the UA for a function in August without mechanical cooling. Nature cooperates a bit more reliably in Fall and Spring. Mid June through mid August, not much help.● If/When mechanical cooling is implemented, this never goes away: this is Economizer mode, something that I find rarely works properly in many buildings, and results in excessive compressor run time when you could be ‘throwing the windows www.nfs-llc.com (dampers) open’
  26. 26. RTU Evaporator and Condensor Coils● These were well maintained by the contractor.● I have seen MANY cooling and condenser coils on Roof Top Units (RTU’s) clogged with lint and debris nationwide in my travels for a major retailer. Some coils are so clogged they resemble fur coats!● I’ve seen just as many control system boards and sensors that were not hooked up correctly or at all.● This unit is apart for a signal wire to the Dietrich Room programmable stat. www.nfs-llc.com
  27. 27. Coil Cleaning● The AHU and Fan Coil heating coils were clean, thus good filter maintenance.● Here is a condenser coil for one of the kitchen refrigerator/freezers. Cleaning these with a soft brush/vacuum can help all year round.● Caution: When you clean these, TURN THE STAT UP a little – it will cool more efficiently, so less power/run time is needed; OR, you might freeze and ruin food in the big refrigerators and walk in’s. Watch the temps! www.nfs-llc.com
  28. 28. Someone’s in the Kitchen● There was a piece of fiberglass insulation intermittently jamming the contactor in the On position – to the electric hot water heating booster pump for the dishwasher. Not something I expected to find. Just moved back the insulation after removing the excess (power to the unit off of course) www.nfs-llc.com
  29. 29. Domestic Tap Water Heating● This unit short cycled a lot● Several issues – here’s a model for all these investigations: what was the original problem? How many layers of “Fixes” have well meaning technicians added to just get the hot water working?● The Side Arm heat coil had not been de-limed in ages, and the high temp-low flow safety was shutting the pilot and gas valve off.● I found the safety jumped out● And the flow switch for the recirculating motor defeated to ON● And the stat would just run the HWH with only the hi limit switch to cycle things most of the time. But no one thought about the flow safety. Flushed a lot of slag out of the unit, reset the flow switch, reconnected the safety, then de-limed the Side Arm heater. www.nfs-llc.com
  30. 30. Line Timers on Window Units● Staff gets into the act! Addition of timers to the window unit power cords keeps the AC off at night when the school rooms are vacant just in case the faculty forgets to hit the switch. www.nfs-llc.com
  31. 31. Programmable Thermostats● Basic 7 day, 4 period per day programmable stats were added to● LA (also enabling Free Cooling fall-spring-summer damper control)● Dietrich Room (RTU for cooling, small steam valve FC for heating, now the two can’t run at the same time!)● Offices (cooling only, but programmed to recover before the work day starts and shut down after)● Part of the capital work. Refitting a unit to one of these runs anywhere from $300 to $700● SETBACK now programmed in for extended hours, further back than the pneumatic stats would allow. www.nfs-llc.com
  32. 32. Year 2 Capital Improvements: Cutout Control, Boiler and Fans● Having established that with simple repairs and adjustments, use reduction and cost savings are predictable, AND we start putting some of that cost savings in the bank,● THEN we look at ‘improvements’ – but look out, the new performance baseline is in effect. We have to improve on what we’ ve just established, and the improvements have to pay for themselves else they’re just a fancy luxury. www.nfs-llc.com
  33. 33. Cutout Control, Boiler and Fans: Trending, Alerts, Internet Access● Alerts set up for Flame Failure, Low Water, Low Temp, Control Air Out of Range.● Can trend outside air temperature, control air to ensure building wide pneumatic setback is functioning, idle-purge-fuel status, inside temp● Has an inside temp override to enable the boiler and control air system should the inside temp go below 66 degrees – sometimes the 45 degree cutout might lead to inside cooling during long periods at or above 45, with no sunlight. www.nfs-llc.com
  34. 34. Year 2 Capital Improvements: Cutout Control, Boiler and Fans● On top of that conduit is an outdoor air sensor. This is pivotal to the new system.● We have determined that when it’s 45 degrees or warmer, the boiler can shut down. We have a control loop to the UA, LA and FC fans that also disable the fan starters when the AHU’s can’t heat.● In the Fall and Winter, we play with settings ranging from 55 to 72 – when it’s too hot outside to cool the rooms, the fans shut down no matter what the stats are trying to make them do. www.nfs-llc.com
  35. 35. Internet Programmable Controller for Upper Assembly Fan: Cutout, setback, scheduling, 2 stage heat, overnight cooling.● Using Mamac Maverick Stats (designed, and built in Chanhassen).● Hybrid system – these control inexpensive skinner valves to slowly dump control air to the steam valve, opening it after the fan starts, in response to programmed time and temperature.● On line via port forwarding in the router, password protected● Out of range alerts programmed to cell phone, email, etc. www.nfs-llc.com
  36. 36. "A fan in the open window on a cool fall, summer, or spring night"● It was cheaper to have the new digital controller run the outside air and return dampers on control air rather than purchase motorized damper motors; thus, to keep the main building compressor off in the summer, this $60 unit comes on as “stage 1 cooling” to drive the return dampers shut and outside air dampers open at night or whenever the outside air is cool enough to cool inside the building. www.nfs-llc.com
  37. 37. More on the UA Intervention● We went from 24 cycles a day to 18 on a unit that accounts for more than 20% of the buildings steam consumption.● Now, with a 50 degree setback, and the unit only warming up 2 nights each week and for Sunday occupancy,● We have recorded less than 12 cycles FOR AN ENTIRE WEEK for this AHU under the same OA temp conditions!!! www.nfs-llc.com
  38. 38. Live Time View of First Unitarian Society Upper Auditorium and Boiler Controls● These are read only, and password protected, so you can’t do anything to change or effect the settings to the units. It’s safe to look.● These should open in a separate web browser window on your PC, Laptop or PDA:● Boiler Control● Upper Auditorium AHU Control www.nfs-llc.com
  39. 39. Cumulative Cost Savings Prepared by Bruce Nelson, PEwww.nfs-llc.com
  40. 40. Electricity Consumption Reduction Prepared by Bruce Nelson, PEwww.nfs-llc.com
  41. 41. Gas Consumption Reduction Prepared by Bruce Nelson, PEwww.nfs-llc.com
  42. 42. Energy Star Portfolio Manager Tracking Prepared by Bruce Nelson, PE www.nfs-llc.com
  43. 43. Utility Audit RecommendationsThe find and fix work that earned immediate, cumulative and durable savings was all controls centered. www.nfs-llc.com
  44. 44. Other efforts ● Unique envelope response to old single glazed windows and channels that were far from airtight. Winter wind blew right threw them into the spaces we were trying to heat and retain temp in. We sealed gaps in moveable aluminum frame components reachable from the ground with a non toxic, odorless, food grade sealant with a battery powered applicator.www.nfs-llc.com
  45. 45. Loving the Environment● First Unitarian Society of Minneapolis has saved in the contract period● 26090 kWh● 113 KW● 10682 THM● 27 MtCO2e● $9500 ($13000 in the EPA period thus far)● And has achieved● Thms per HDD to 2.6● An Energy Star Portfolio Manager rating increase from 28 to 52 as of August 2011● EUI rating improvement from 160 to 137 www.nfs-llc.com
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