UVM Central Utility Plant: A Half Century of Growth, Innovation, & Efficiency

Transcription

1 UVM Central Utility Plant: A Half Century of Growth, Innovation, & Efficiency IDEA Campus Energy 2018 Baltimore, MD Presenters: Sal Chiarelli, UVM, Mike Pelletier, UVM, Bill Mahoney, RMF Time: 10:30 AM 11:00 AM March 8, 2018 (Thursday)

2 PRESENTERS Sal Chiarelli Director of Physical Plant University of Vermont Mike Pelletier, PE, CEM Senior Project Engineer University of Vermont Bill Mahoney, PE Mechanical Engineer RMF Engineering

3 Chartered in 1791 Fifth oldest university in New England (after Harvard, Yale, Dartmouth and Brown) Called UVM for Universitas Viridis Montis, Latin for University of the Green Mountains Mascot: Catamount 460-acre campus, 6 million Sq. Ft majors in 7 undergraduate schools and colleges Undergraduate Students: 10,513 Graduate Students: 1,542 Medical Students: 461 1,600 full and part-time faculty

4 EXISTING CAMPUS UTILITIES Electric Distribution from 125 Municipal Utility Services & Gas from Municipal service at 125 points Central Steam Boiler Plant Four 40,000 PPH + One 64,000 PPH Dual Fuel Boilers 200 PSI Steam Delivered Year-Round to 80 Buildings Converted From No. 6 Fuel Oil Backup to No. 2 Low Sulfur Central Chiller Plant Two 1,365 Ton Steam Turbine Drive Centrifugal Chillers Interconnected Satellite Chiller Plants (Absorbers and Electric Chillers) 42F CHW Delivered May Through October (minimal winter load) to 15 Buildings

5 CHW Generation & Distribution Central Chiller Plant Inside Cage Boiler Plant Cooling Towers to North Satellite Chillers Variable Primary & P/S Pumping Radial Feed Distribution Migrating to Being Looped Up to 20 Diameter Direct Buried Pre-insulated Ductile Iron Adding Service to Existing Buildings STEM Residence Hall Satellite Chillers Cooling Towers Central Chillers Satellite Chillers

6 CHILLED WATER CAPACITY NEEDS N+1 Reliability Goal Unreliable Smaller Remote Units Two 1,600 Ton Chillers Potential for Future 3rd New equipment to be located in a physical addition to the Cage Plant

7 A Building Full of UVM History

8 A Building Full of UVM History National Register of Historic Places 1901 Original Construction 1915 Addition Glass Roof Dirt Floor Drill Hall Indoor Track Batting Cage

9 A Building Full of UVM History In 1918, the gymnasium was used as an infirmary during Spanish influenza outbreak.

10 A Building Full of UVM History Early events held inside the Gymnasium Addition included skits, banquets, and Commencement ceremonies. Notice the windows, the dirt floor, and the batting cage nets suspended from ceiling.

11 A Building Full of UVM History After 1962, the vacated Old Gym served as ROTC headquarters, Military Studies department, a testing facility for civil engineering, and a research laboratory for forestry and zoology. In 1974, the west portion of building became the Royall Tyler Theater.

12 s 1980 s 1990 s 2000 s 2010 s 2019 The To improve underground safety storage and efficiency, Boilers tank farm #3 and The was Two and address Board completely 1,360 #4 of deferred ton Trustees steam-driven refurbished. maintenance approved Boilers The York a new chillers #1 Central and Boiler #2 were Heating Completed installed controls Plant inside were a major to upgraded be the controls located Plant Boiler to (in upgrade permit #5 the to convert burning the of natural Plant from gas and Boilers #1 and #2 Boilers #3 and #4 Boiler controls were The underground Boiler #5 To improve safety and Completed a major Two 1,360 ton steamdriven York chillers were Two issues, two 40,000 old a tanks major Two pound gas-fired were project per 40,000 filled hour was with Two undertaken Babcock concrete 40,000 pound Two per the and to space gas-fired convert Wilcox abandoned that upgraded to permit the D 40,000 once inside South type place, held storage pound watertube the Campus tank the east and farm per HTHW section hour A 64,000 equipment). Erie of pound the City pneumatic per A fuel Old 64,000 O oil These Gym. efficiency, type simultaneously, controls pound watertube were per the to more hour first and address steam further O controls ever modern type adding Aalborg Delta to the V water versatility direct tube digital of boiler the controls. Plant. with a upgrade to pound per hour Erie hour Babcock and the burning of natural was completely hour O type Aalborg deferred maintenance issues, convert the Plant from installed inside the Plant three HTHW new system boilers 50,000 City O entirely type also gallon watertube with to tanks steam. dual Wilcox fuel were New D type capability boilers installed steam-driven were gas stations to and were hold fuel installed, oil installed. chillers were 150,000 refurbished. installed and gallons The the two in first State water generation of tube Vermont. boiler 95% with a of guaranteed underground The chillers efficiency a major project was distribution are efficient rating was added to meet the University s pneumatic controls to (in the space that once steam boilers were watertube boilers also simultaneously, tanks were filled 95% guaranteed undertaken to convert the more modern Delta V held the HTHW Gym. of south backup campus installed, boiler and buildings. fuel enough the first with HTHW dual to fuel meet capability equipment because This piping peak part further demand was most inside of adding the laid of to the the building on the out Plant cold energy to with deliver concrete winter was originally used and steam comes efficiency constructed to many rating from was A central excess condensate Also in South 1915 completed Campus campus steam with polishing HTHW a from system glass buildings. a growing major the roof direct boilers system electrical appetite was service for installed steam. upgrade to remove to the impurities Plant. digital controls. equipment). These were generation of were installed. versatility of the Plant. abandoned place, added to meet the entirely to steam. New the first ever steamdriven chillers in the These were underground added days removed distribution when to handle to natural free the up gas increased space supply housed for is other steam an interrupted. indoor needs. demand track that and and resulting three would baseball new otherwise University s batting growing be from cages. wasted. the stations The returning were facility steam installed in has Also been condensate, prior to it being reintroduced as completed a major piping was laid out to 50,000 gallon tanks appetite for steam. south campus buildings. electrical service upgrade State of Vermont. The from the addition deliver steam to of many a new high temperature hot water nicknamed were (HTHW) installed to hold the Cage ever The since. 5 boiler provided much boiler needed feedwater. additional capacity and the HTHW equipment inside the to the Plant. chillers are efficient Kalkin). central campus 150,000 gallons of The 5 th boiler provided Plant was removed to free up because most of the heating This multi-phase system buildings. for multi-year the South project Campus Chilled included residence water the was installation halls initially and backup Athletic piped of boiler 5.3 fuel to Davis much Center, needed flexibility Bailey-Howe, for scheduling Royall Tyler boiler and maintenance and repairs even during space for other needs. energy used comes from enough to meet peak additional capacity excess steam from the miles complex. of new Adding and replacement South Campus underground to The the west central side steam system originally piping was demand more built because on cold Old in 1901 Mill/Lafayette. and the was flexibility converted for The main This multi-phase into boiler the stack multi-year Royall was cold Tyler extended winter months. in height and all the brickwork boilers that would winter days when scheduling boiler project included the otherwise be wasted. the energy original efficient direct buried than keeping piping by the now 1960 s 25 years stand-alone old was boilers natural showing gas supply is Theater. maintenance and was replaced. installation of 5.3 miles of since. interrupted. repairs even during new and replacement severe signs of aging and deterioration. cold winter months. underground steam piping because the original direct The two functions have remained neighbors ever since. The Board of Trustees approved a new Central Heating Plant to be located inside the east section of the Old This part of the building originally constructed in 1915 with a glass roof housed an indoor track and baseball batting cages. The facility has been nicknamed the Cage ever The west side originally built in 1901 was converted into the Royall Tyler Theater. The two functions have remained neighbors ever since. A wind storm in the 1950 s destroyed the original glass roof and a section of the east wall s 1990 s 2000 s These were added to handle the increased steam demand resulting from the addition of a new high temperature hot water (HTHW) heating system for the South Campus residence halls and Athletic operation. complex. Adding South Campus to the central system was more energy efficient than keeping the 1960 s stand-alone boilers in operation. A condensate polishing system was installed to remove impurities from the returning steam condensate, prior to it being reintroduced as boiler feedwater. The main boiler stack was extended in height and all the brickwork was replaced. The condensate polishing system was expanded to handle up to 400 gallons per minute of polished feedwater. Four tanks were installed in parallel fashion so that when one tank is taken off line for backwashing and regeneration, the other tanks can handle the flow s 2010 s 1969 buried piping by now 25 years old was showing severe signs of aging and What will the next 50 years bring? Chilled water was initially piped to Davis Center, Bailey-Howe, Royall Tyler and Old Mill/Lafayette. With the existing chiller capacity maxed out, a major expansion to the system was necessary to provide central cooling for new buildings (STEM complex and central campus residence hall) and buildings undergoing renovation (Votey, Billings and The Plant was expanded by a 7,500 square-feet addition and a new cooling tower enclosure. A new 1500 ton Electric Chiller along with the associated pumps and auxiliary equipment was installed in the new space. Operators now monitor all and Operators now deterioration. monitor all system components performance on virtual display and components on virtual display screens inside the control room. The person standing between two of the 50,000 gallon tanks The person helps standing between two of the The campus continued to 50,000 gallon tanks helps plans were The boilers were give a sense of their size. The campus continued to grow, plans were underway for building a give a sense of their size. underway for building a retrofitted with dual new new student center and The condensate burners to allow polishing the use system A solar panel array was The was boilers expanded were to retrofitted handle up with to 400 dual burners to A student allow solar the panel center use array and of natural was the the gas put demand demand on for central rooftop for central as part air of a conditioning demonstration was of natural gas or low put on rooftop as part of increasing. air conditioning was sulfur No. 6 fuel oil. The The chilled water piping gallons per minute of polished feedwater. a demonstration project. low sulfur Four No. tanks 6 fuel were oil. installed The oil was in needed as a project. backup At As fuel the a source time, result, it increasing. in was the Board the the As a result, largest of Trustees single array approved in the a State plan to The chilled water piping was extended to supply Jeffords Hall, HSRF and oil was needed as a was extended to supply At the time, it was develop the a state-of-the-art the centralized Board of Trustees backup fuel source in Jeffords Hall, HSRF and parallel fashion so that when one tank is largest single array event taken that off line natural for backwashing gas supply was interrupted. Oil was stored in large approved of a Vermont. chilled water plant to meet the Given buildings. plan to the event that natural Given buildings. the State capacity needs for the Davis develop a Center, state-of-the-art and to replace existing inefficient gas supply was Original 1970 s pneumatic New steam and regeneration, piping laid in the pre-cast other concrete of Vermont. underground tanks can trenches, handle tanks the wrapped located flow. on with the south side of Royall Tyler near Morrill centralized Hall. chilled water interrupted. Oil was controls inside the Plant. decentralized plant to meet chillers the capacity in other buildings. metal insulating stored large jacket and sealed Converted in vaults to boilers protect from from No.6 the to No.2 fuel oil and the underground tanks needs were for the Davis underground tanks Original Center, and to replace located on the 1970 s south pneumatic Boilers #1 and #2 controls inside the Plant. Converted boilers from elements. emptied, cleaned and replaced with No. 2 fuel. existing inefficient side of Royall Tyler near were re-tubed No.6 to No.2 fuel oil and decentralized chillers in Morrill Hall. the underground tanks Boilers #1 and #2 were re-tubed other buildings. were emptied, cleaned and A wind storm in the 1950 s destroyed the original glass roof and a section of replaced with No. 2 fuel. the east wall. New steam piping laid in pre-cast concrete trenches, wrapped with metal insulating jacket and sealed in vaults to protect from the elements. screens inside the control room. With an eye towards the future, the addition includes floor space to accommodate another chiller if needed, for meeting the ever-increasing demands for air conditioning our growing campus.

13 Campus Video

14 SITE CONTEXT

15 COOLING TOWER SITING

16 COOLING TOWER SITING

17 PLANT EXPANSION

18 Before After

19 Original Cells Enclosure PLANT EXPANSION LAYOUT New/Future Cells Steam Plant Vault (Below) Chiller Room Existing Chiller Room Pump Room Royall Tyler Theater Cage Boiler Plant Chiller Plant Expansion

20 HVAC

21 Congested Utilities Busy Area Telecomm Backbone Zero Interruptions Vault in Expansion Multiple Relocations Out of Expansion Out of CT Basins Vault below Expansion New Services Municipal Electric Switch STEM Building ROYALL TYLER THEATER CENTRAL HEATING PLANT CHILLER PLANT EXPANSION

22 CHILLED WATER CIRCUIT

23 CONDENSER WATER CIRCUIT ELECTRIC CHILLER ELECTRIC CHILLER ELECTRIC CHILLER

24 PROJECT RESULTS 1,500 ton (0.57 Kw/Ton) electric centrifugal chiller Auxiliaries A future 1,500 ton unit Ultimate installed cooling capacity to 5,730 tons Free cooling system

25 ACCESSIBLE FLOOR TRENCH

26 PLANT FEATURES

27 EXTERIOR

28 OPERATIONS Steam Freeze Protection Concrete Basins and Concrete Collection Trough Free Cooling Standalone OR Series / Upstream of Chiller Electric or Steam Cooling - as Rates Dictate Can Meet Loads as Low as 200 Tons

29 LESSONS LEARNED Control Migration Discuss early and often Rehearse / Walk Thru Contingency Fund Unknown Utilities Existing System Improvements Test pits Clear scope (Level A/B/C) Consider full excavation for busy areas Maintain Records (esp. piping under protective slabs) BED Switch Icing

30 Open House Celebration

31 Community Education Hosted 20 small group tours through the entire Plant 140 attendees 123 scoops of Ben & Jerry's Ice Cream

32 4 th & 5 th Chillers NEXT STEPS Electric Service in place Revisit Steam Space to expand in cooling tower yard Identify space for 5 th chiller Complete CHW Loop & Upgrade Satellite Pumps

33 Thank you Audience Q & A

34 Thank you Audience Q & A Closing Video