Sea Water Heat Pump Project

Transcription

1 Sea Water Heat Pump Project Alaska SeaLife Center, Seward, AK Presenters: Andy Baker, PE, YourCleanEnergy LLC Dr. Tara Riemer Jones, Ph.D., President & CEO Darryl Schaefermeyer, Operations Manager REAP Forum Anchorage Museum May 9, 2012

2 YourCleanEnergy LLC - Mission History: Providing clean energy consul4ng (financial evalua4on & design) services to commercial and municipal clients in Alaska since Specialize in sea water heat pump evalua4on & design. Successful clean energy projects are ones that are: Affordable Reliable Safe

3 What Is Emerging Technology? Denali Commission / Alaska Energy Authority Guidelines 1. Test emerging energy technologies or methods of conserving energy; 2. Improve an existing energy technology; or 3. Deploy an existing technology that has not previously been demonstrated in the state.

4 Emerging Technology Challenge

5 Emerging Technology Adoption Emerging technology should be an appropriate fit for the en4ty that will own, operate and maintain the system over design life: First Adopters Early Adopters Alaska SeaLife Center Mainstream Adopters Late Adopters / Reluctant Converts Non- Adopters / Naysayers / Objec4onists

6 Technology Overview Q = Quan4ty of heat produced by heat pump P = Electrical power used by heat pump COP (Coefficient of performance) of expected from ASLC seawater heat pump

7 Sea Water Heat Pump Systems Norway, Sweden & Canada The concept of using heat from seawater for building demands has been employed for nearly 20 years in \ords along the coast of Scandinavia: Stockholm, Sweden = Vartan Ropsten = largest seawater heat pumps on the planet Bodo Norway, pop 41,000, district hea4ng w/44.6f seawater on military base STATOIL Research Centre, Trondheim, Norway, district hea4ng with seawater Vancouver West Conven4on Centre, Downtown Waterfront

8 Technology Fundamentals HOT GLYCOL TO AIR HANDLERS HOT LIQUID EXPANSIO N VALVE COOL LIQUID RAW SEAWATER 120 F 40 F CONDENSOR R- 134a REFRIGERANT IS USED IN HIGH EFFICIENCY ROTARY SCREW COMPRESSOR CHILLERS EVAPORATOR 98 F 36 F WARM GLYCOL FROM AIR HANDLERS VERY HOT VAPOR COMPRESSOR WARM VAPOR CHILLED SEAWATER TO OCEAN

9 Key Technology Component Emerging technology with more efficiency & lower maintenance Single packaged unit can now perform complex heat pump func4ons with high reliability and serviceability Can be operated and supported with automated controls and web based monitoring

10 Expected Technology Performance Month Entering Evaporator deg F Heating MBH (output) kw (input) COP Jan Feb March April May June July August September October November December Worst

11 Water Source vs. Air Source Heat Pumps

12 Heat Pumps Can Provide Viable Option To Oil

13 Alaska SeaLife Center The Alaska SeaLife Center generates and shares scien4fic knowledge to promote understanding and stewardship of Alaska s marine ecosystems.

14 Alaska SeaLife Center Economic Profile of the Center $4.77 million in annual payroll 90 year round employees Largest private employer in Seward, and 11th largest on Kenai Peninsula Year round tourism for South Central Alaska: 160,000 visitors/yr

15 Goals = Reduce Energy Cost & Carbon Emissions Energy Use Profile for the 120,000 sq n Alaska SeaLife Center: Hea4ng loads are large = air handlers, baseboards, duct coils, pavement hea4ng, domes4c hot water Two oil fired boilers plus one electric boiler in plant Hea4ng oil demand can exceed 500 gallons per day in winter and up to 132,000 gallons per year. In 2008 with $5/gallon pricing, annual hea4ng costs reached $463,000.

16 Sea Water Heat Pump Project

17 Resurrection Bay is very deep body of water 900+ ft in large bathtub area Bay is facing due south, receives tremendous solar gain thru summer Bay holds heat because it is not flushed out by ocean currents; tides are mild; some cooling from glaciers and rivers that drain into Bay

18 Seward Sea Water Heat Resource ASLC Raw Seawater Temperatures for Temperature, Degrees F Maximum Monthly Seawater Temperature (F) Average Monthly Seawater Temperature (F) Minimum Monthly Seawater Temperature (F) 36 Jul Aug Sept Oct Nov Dec Jan Feb Mar Apr May Jun Storage of solar heat in Resurrec4on Bay = year round usable heat resource

19 Sea Water Heat Pump Project Summary of Partnerships with Strong Support City of Seward looking to reduce future cost of hea3ng for downtown district Kenai Fjords Na4onal Park looking to reduce cost of hea3ng for future visitor center and administra3on building Alu4iq Pride Shellfish Hatchery also has an exis3ng seawater intake available UAF School of Fisheries & Ocean Sciences - Seward Marine Center also has exis3ng seawater intake available

20 Financial Evaluation - Projected CAPITAL COST: ($713,300 Grant + $120,000 Match) $ 833,300 ANNUAL COST FOR GLYCOL PUMPING: $ 26,000 ANNUAL COST FOR HEAT PUMP ELECTRICITY: $ 63,800 ANNUAL COST FOR O&M: $ 12,000 ANNUAL VALUE OF HEATING OIL SAVED: $ 192,000 NET PRESENT WORTH WITH 20 YR LIFE CYCLE: $ 1,500,000 YEARS TO PAYBACK INVESTMENT: 8.5 YEARS ANNUAL CO2 PRODUCTION AVOIDED: 1.3 million LBS CO2 Electricity cost = start at $0.104/kwh with 4% per year escala4on Hea4ng oil cost = start at $3.84 /gallon with 6% per year escala4on System running with slab heat connected & heat recovery installed

21 Overall System Operator Screen Two 90 Ton Heat Pumps Will Be Used To Supply Air Handlers & Domes4c Hot Water Loads

22 Overall System Operator Screen

23 Actual Installation Heat Pumps Two 90- Ton Heat Pumps One or Two Heat Pump Opera4on

24 Actual Installation Sea Water HX Transfers Heat From Sea Water Into a Glycol Loop That Then Passes Through Heat Pumps

25 Actual Installation Loop Pumps High- Efficiency Circula4on Pumps Move Glycol and Water Through the Heat Pumps

26 Actual Installation Air Handler HX Heat Pumps Warm Up Water Loop to 120 F This Heat is Then Transferred to Air Handler Loop

27 Actual Install Domestic Hot Water HX City Water Entering at 45 F is Pre- Heated Up To 100 F With a Side Loop From Heat Pumps

28 Actual Installation Motor Control Center All Electricity Used For Heat Pumps, Circula4on Pumps, and Controls is Supplied by One MCC

29 System Performance Winter 2011/12 Hea3ng oil savings of 12,000 gallons over previous winter, despite much colder temperatures, record snow fall, and having to run a now oversized boiler for slab heat. Net monthly savings of $15,000 per month in coldest months = December & January Expect to double savings next winter when sidewalk snow melt system is connected, heat recovery is installed, and oil boilers are completely shut off

30 Lessons Learned Winter 2011/12 Heat pumps operate most efficiently when fully loaded Sidewalk snow melt is a large heat load that will be added to heat pump system for winter 2012/13 Exis3ng oil boilers are now too large and expensive to hybridize with heat pumps Original HVAC controls for air handlers and boilers require upgrades to increase benefit of low temperature heat from heat pumps

31 Project Tasks & Timeline Final Design was completed by YourCleanEnergy on November 30, 2010 Equipment installa4on - March - June 2011 Commissioning/start up - July 2011 April 2012 Tes4ng & Data Monitoring Hea3ng Season of Sept 2011 Thru April 2012 Connect Sidewalk Snow Melt To Heat Pumps And Install Heat Recovery System By September 2012

32 Project Status Construc3on completed July 2011, now in tes3ng and commissioning phase Alaska SeaLife Center secured addi3onal funding from M.J. Murdock Charitable Trust to improve the base sea water heat pump system: install heat recovery system that uses waste heat from exhaust fans to pre- heat glycol before entering heat pumps; will increase COP, and the investment will payback in less than 3 years connect the pavement hea4ng system to heat pump system so that further reduc3ons in oil usage will occur in shoulder seasons

33 Sea Water Heat Pump Project Andy Baker, PE YourCleanEnergy LLC Tara Riemer Jones, Ph.D., President & CEO Darryl Schaefermeyer, Operations Manager Your Questions About This Project? Please visit your Alaska SeaLife Center in 2012