![Pg. 21
Detailed Savings at In Depth Sites
Indoor Public Pool Optimization
Site Measure
Annual
Energy
Cost
Savings**
% of
Energy
Cost
Gas
Savings
[therms
]
% of
Gas*
Electric
Savings
[kWh]
% of
Electric*
Measure
Cost
Payback
Period
HP4 Liquid Pool Cover (Engineering Estimate) $1,410 8.5% 590 22% 9,599 7% $1,000 0.7 years
HP4 Liquid Pool Cover (Observed)* $28 0.2% -254 -9% 1,639 1% $1,000 36 years
HP4 Space Temperature Increase—All Year -$2,363 -14.3% -474 -17% -18,893 -14% $0 Never
HP4 Space Temperature Increase—Summer $744 4.5% 76 3% 6,352 5% $0
Immediat
e
SC17 Pool Cover (Engineering Estimate) $2,604 6.8% 4,340 13% 0 0% $2,500 1.0 years
SC17 Pool Cover (Observed) $2,160 5.7% 3,600 11% 0 0% $2,500 1.2 years
SC17
Reduce Outdoor Air Flow and Space
Temperature
$6,644 17.5% 11,074 33% 0 0% $1,500 0.2 years
SC17 Switch to Dedicated Boiler Year-Round $1,316 3.5% 2,194 7% 0 0% $0
Immediat
e
SC23 Control Retrofit (Engineering Estimate) $3,946 11.4% 1,300 6% 28,780 12% $9,000 2.3 years
SC23 Control Retrofit (Observed)* $1,638 4.3% -2,487 -12% 28,453 12% $9,000 5.5 years
FT28 Control Upgrade & Fixes $5,392 5.0% -23,507 -67% 177,242 23% $15,700 2.9 years
FT30
Control Change to Reduce Outdoor Air
and Increase Recovery
$5,623 10.9% 6,613 12% 15,048 9% $3,500 0.6 years](https://image.slidesharecdn.com/poolswebinarceev4livewebinarversion-171115200750/75/Optimized-Operation-of-Indoor-Public-Pool-Facilities-21-2048.jpg)
Uploaded byCenter for Energy and Environment
Optimized Operation of Indoor Public Pool Facilities
This webinar discussed research into optimizing the operation of indoor public pool facilities in Minnesota to save energy. The research characterized over 2,000 indoor pools statewide, conducted in-depth evaluations at 6 sites, and identified key savings opportunities. Statewide, HVAC control upgrades had the largest potential savings. Operational improvements like adjusting temperature and humidity setpoints and installing pool covers could also significantly reduce energy use. The webinar provided recommendations for utility programs and introduced guides developed for pool operators and recommissioning providers.
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Optimized Operation of Indoor Public Pool Facilities
- 1. Welcome Conservation Applied Research& Development (CARD) Webinar
- 2. Optimized Operation ofIndoor Public Pool Facilities Mary Sue Lobenstein R&D Program Administrator marysue.Lobenstein@state.mn.us 651-539-1872 Russ Landry Senior Mechanical Engineer Center for Energy and Environment rlandry@mncee.org 612-335-5863 2
- 3. Webinar Basics •Attendees inlisten-only mode •Type your questions into Question Box •Questions addressed at end •Webinar recorded & archived online •Handout: webinar slide deck Image: Nick Youngson http://www.picserver.org/w/webinar.html 3
- 4. Minnesota Applied Research& Development Fund State Capitol Image: Courtesy Minnesota Department of Administration • Purpose to help Minnesota utilities achieve 1.5% energy savings goal by: • Identifying new technologies or strategies to maximize energy savings; • Improving effectiveness of energy conservation programs; • Documenting CO2 reductions from energy conservation programs. Minnesota Statutes §216B.241, Subd. 1e • Utility may reach its energy savings goal • Directly through its Conservation Improvement Program (CIP) • Indirectly through energy codes, appliance standards, behavior, and other market transformation programs 4
- 5. CARD RFP Spendingby Sector thru mid-FY2017 Multi-sector (21), 25.3% Commercial (36), 37.6% Residential 1 - 4 unit (15), 18.7% Industrial (10),8.6% Multifamily 5+ unit (4), 6.6% Agricultural (6), 3.1% •8 Funding Cycles •Nearly 380 proposals •92 projects funded 5
- 6. OPTIMIZED OPERATION OFINDOOR PUBLIC POOL FACILITIES Russ Landry, PE, LEED®AP Senior Mechanical Engineer This project was supported in part by a grant from the Minnesota Department of Commerce, Division of Energy Resources through the Conservation Applied Research and Development (CARD) program.
- 7. Pg. 7 Optimizing IndoorPublic Pool Facilities Why we took a look | We’ve seen big energy saving opportunities in other facilities with specialized HVAC systems, such as ice arenas. Indoor Public Pool Optimization
- 8. Pg. 8 Optimizing IndoorPublic Pool Facilities Why we took a look | We’ve seen big energy saving opportunities in other facilities with specialized HVAC systems, such as ice arenas. Research Objective | Determine energy cost savings potential from operational improvements and develop guides for operators and recommissioning providers. Indoor Public Pool Optimization
- 9. Pg. 9 Optimizing IndoorPublic Pool Facilities Why we took a look | We’ve seen big energy saving opportunities in other facilities with specialized HVAC systems, such as ice arenas. Research Objective | Develop guides for operators and recommissioning providers & determine energy cost savings potential from improvements. Study Efforts & Findings • Baseline Characterization • Detailed Investigations • Statewide Potential • CIP Program Recommendations • Guides for ReCx & Operators Indoor Public Pool Optimization
- 10. Pg. 10 Baseline CharacterizationEfforts Compiled Summary Information About Facilities • K-12 Schools—statewide—phone survey from B3 benchmarking list and EducationBug • Hospitality—statewide—Explore Minnesota database • Fitness Centers—added up local—listing of locations for each chain • Multifamily—scaled local data—suburban Ramsey county license data extrapolated based on population ratio from 2010 census On-Site Survey of 30 Facilities • Pool count, types & sizes • Facility and equipment information • Operating conditions • Operator interview Indoor Public Pool Optimization
- 11. Pg. 11 Indoor PublicPools in MN: By Count Indoor Public Pool Optimization Small Pools (<2,000 sf) 51% Large Pools (>2,000 sf) 20% Spas 29%
- 12. Pg. 12 Indoor PublicPools in MN: By Area Indoor Public Pool Optimization Small Pools (<2,000 sf) 30% Large Pools (>2,000 sf) 67% Spas 3%
- 13. Pg. 13 Indoor PublicPool Size Distribution Indoor Public Pool Optimization 0% 5% 10% 15% 20% 25% 30% 250 Pool Area LargeSmall LargeSmall Spas
- 14. Pg. 14 Indoor PublicPools & Facilities in MN Indoor Public Pool Optimization 0 200 400 600 800 1,000 Hospitality Multifamily Public School Fitness Center Others
- 15. Pg. 15 Key PoolArea Equipment Indoor Public Pool Optimization Pool Water Heating & Filtering Space Ventilation, Heating & Dehumidification 84 F 55% RH 82 F
- 16. Pg. 16 On-Site Surveys:Equipment • Sand filters & constant speed pumps nearly universal • Gas-fired heating of pool water • 2/3 secondary heat exchanger • 1/3 package pool heater • Dehumidifier with compressor(s) • 2/3 of “large” • All hospitality • Outdoor air only dehumidifcation • 1/3 of “large” • all multifamily • Space heating via boiler coils—all “large” & 1/3 of “small” • Advanced features in “large” pool rooms • Heat recovery ventilation in 1/3 • Dehumidifier heat reclaim for pool water heating designed in ½ Indoor Public Pool Optimization
- 17. Pg. 17 On-Site Surveys:Operating Conditions • HVAC Controls • Problems &/or insufficient understanding • Space temp << recommended --common • Energy Features Often Disabled • Pool cover (1/2 didn’t use) • Compressor heat reclaim for pool water • Pool water pumping • Recirculation rate >> required in most small pools • Significant valve throttling in large facilities (1/4 large & nearly all small) Indoor Public Pool Optimization
- 18. Pg. 18 Optimizing IndoorPublic Pool Facilities Why we took a look | We’ve seen big energy saving opportunities in other facilities with specialized HVAC systems, such as ice arenas. Research Objective | Develop guides for operators and recommissioning providers & determine energy cost savings potential from improvements. Study Efforts & Findings • Baseline Characterization • Detailed Investigations • Statewide Potential • CIP Program Recommendations • Guides for ReCx & Operators Indoor Public Pool Optimization
- 19. Pg. 19 In-Depth Evaluationsat 6 Sites Sites Chosen for Range of Facility Types & Measures Indoor Public Pool Optimization Building Type Dehumidifier Type HVAC Notes Special Item(s) Hospitality Compressor Common Complex System Temperature Imbalance; Combined Electric Heat, Reheat & Outdoor Condenser Multi-Family Outdoor Air Common Direct- Fired Unit Temperature Imbalance; Variable Speed Exhaust School Outdoor Air Likely Excessive Outdoor Air Unused Cover; Temperature Imbalance School Compressor Common Newer Complex System Heat Recovery Ventilation Fitness Compressor Common Older Complex System Heat Recovery Ventilation; Moderately Low Humidity Fitness Outdoor Air Two Units with 100% Outdoor Air; Common Newer Type Overnight Reduction in Ventilation; Heat Recovery Ventilation
- 20. Pg. 20 Key SavingsMeasures Found at 6 In- Depth Evaluation Sites Indoor Public Pool Optimization $0 $2,000 $4,000 $6,000 $8,000 Pool Cover: Low Cost HVAC Control Upgrade: Moderate Cost HVAC Control Setting: No Cost Hospitality School Fitness Center
- 21. Pg. 21 Detailed Savingsat In Depth Sites Indoor Public Pool Optimization Site Measure Annual Energy Cost Savings** % of Energy Cost Gas Savings [therms ] % of Gas* Electric Savings [kWh] % of Electric* Measure Cost Payback Period HP4 Liquid Pool Cover (Engineering Estimate) $1,410 8.5% 590 22% 9,599 7% $1,000 0.7 years HP4 Liquid Pool Cover (Observed)* $28 0.2% -254 -9% 1,639 1% $1,000 36 years HP4 Space Temperature Increase—All Year -$2,363 -14.3% -474 -17% -18,893 -14% $0 Never HP4 Space Temperature Increase—Summer $744 4.5% 76 3% 6,352 5% $0 Immediat e SC17 Pool Cover (Engineering Estimate) $2,604 6.8% 4,340 13% 0 0% $2,500 1.0 years SC17 Pool Cover (Observed) $2,160 5.7% 3,600 11% 0 0% $2,500 1.2 years SC17 Reduce Outdoor Air Flow and Space Temperature $6,644 17.5% 11,074 33% 0 0% $1,500 0.2 years SC17 Switch to Dedicated Boiler Year-Round $1,316 3.5% 2,194 7% 0 0% $0 Immediat e SC23 Control Retrofit (Engineering Estimate) $3,946 11.4% 1,300 6% 28,780 12% $9,000 2.3 years SC23 Control Retrofit (Observed)* $1,638 4.3% -2,487 -12% 28,453 12% $9,000 5.5 years FT28 Control Upgrade & Fixes $5,392 5.0% -23,507 -67% 177,242 23% $15,700 2.9 years FT30 Control Change to Reduce Outdoor Air and Increase Recovery $5,623 10.9% 6,613 12% 15,048 9% $3,500 0.6 years
- 22. Pg. 22 Optimizing IndoorPublic Pool Facilities Why we took a look | We’ve seen big energy saving opportunities in other facilities with specialized HVAC systems, such as ice arenas. Research Objective | Develop guides for operators and recommissioning providers & determine energy cost savings potential from improvements. Study Efforts & Findings • Baseline Characterization • Detailed Investigations • Statewide Potential • CIP Program Recommendations • Guides for ReCx & Operators Indoor Public Pool Optimization
- 23. Pg. 23 Statewide SavingsPotential Indoor Public Pool Optimization # of Applicable Buildings CCF/ Building kWh/ Building MCF Statewide MWh Statewide No Cost Changes* 907 853* 3,878* 77,394* 3,517* HVAC Recommissioning/Audits 2,029 2,545 8,788 516,302 17,832 Liquid Pool Cover 1,394 221 1,453 30,755 2,026 Variable Speed Pool Pumping 907 0 9,789 0 8,879 Total 2,029 2,696 14,163 547,057 28,736 *Values for no-cost changes were not added to the totals because the savings associated with this measure is mutually exclusive with the recommissioning audits (within the same building).
- 24. Pg. 24 Optimizing IndoorPublic Pool Facilities Why we took a look | We’ve seen big energy saving opportunities in other facilities with specialized HVAC systems, such as ice arenas. Research Objective | Develop guides for operators and recommissioning providers & determine energy cost savings potential from improvements. Study Efforts & Findings • Baseline Characterization • Detailed Investigations • Statewide Potential • CIP Program Recommendations • Guides for ReCx & Operators Indoor Public Pool Optimization
- 25. Pg. 25 CIP ProgramRecommendations Indoor Public Pool Optimization Promote Recommissioning/audits with providers guided by new ReCx Guide Develop prescriptive/simple rebate for VSD on pool pump Consider pilot/custom rebate for liquid pool cover with M&V of first few sites Promote use of Operator’s guide by facility staff & contractors
- 26. Pg. 26 Optimizing IndoorPublic Pool Facilities Why we took a look | We’ve seen big energy saving opportunities in other facilities with specialized HVAC systems, such as ice arenas. Research Objective | Develop guides for operators and recommissioning providers & determine energy cost savings potential from improvements. Study Efforts & Findings • Baseline Characterization • Detailed Investigations • Statewide Potential • CIP Program Recommendations • Guides for ReCx & Operators Indoor Public Pool Optimization
- 27. Pg. 27 Highlights ofOperator’s Guide Indoor Public Pool Optimization
- 28. Pg. 28 Highlights ofOperator’s Guide: Optimal Relative Humidity Indoor Public Pool Optimization 20% 30% 40% 50% 60% 70% 0°F 20°F 40°F 60°F 80°F Pool Area Humidity Range Outdoor Temperature Limits of Common Actual RH RH Setpoint Limits
- 29. Pg. 29 Highlights ofOperator’s Guide: Seasonal HVAC Operation Indoor Public Pool Optimization
- 30. Pg. 30 Optimizing IndoorPublic Pool Facilities Key Findings Buildings & Pools Overview • Within Minnesota there are ~2,200 indoor public pools and 900 spas in ~2,000 buildings • Most of the pool area is within the lower number of large pools found in schools & fitness centers • A large number of smaller pools are found in multifamily and hospitality buildings Savings Opportunities • HVAC control upgrades and/or setting changes is #1 potential measure • Variable speed pumping is #2 potential measure • Whether either of these two (or other measures) apply and the amount of savings varies greatly from facility to facility • Liquid pool covers is another, smaller opportunity area that should be explored further Indoor Public Pool Optimization
- 31. Send us yourquestions using GoToWebinar question box Questions? 31
- 32. CARD Project Resources R&DWeb Page (https://mn.gov/commerce/industries/energy/utilities/cip/applied-research-development/) For Reports use CARD Search Quick Link For Webinars use CARD Webinars & Videos Quick Link Webinar Recording & Final Report available in few weeks 32
- 33. Thanks for Participating! UpcomingCARD Webinars: • Nov 29: Performance-based design & procurement in new construction • Dec 7: Ongoing commissioning in out-patient medical clinics • Dec 14: Evaluation of moisture & heat transfer furnace retrofit Commerce Division of Energy Resources e-mail list sign-up If you have questions or feedback on the CARD program contact: Mary Sue Lobenstein marysue.Lobenstein@state.mn.us 651-539-1872 33