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Subcooling Mini-Split Senior Capstone Design Bangor Hydro Presentation 12/17/13 Samuel Prentiss Matt Strong Bruce Tuttle Slide 2 Tonights Points 1. Subcooling Heat Pump 2. Installation & Testing 3. Return on Investment 4. Marketable Product Slide 3 The Heat Pump Cycle Image Source: http://www.air-conditioning-and-refrigeration-guide.com/ R-410A Vapor Condenses R-410A Liquid Evaporates R-410A Vapor Compressed R-410A Liquid Expands Slide 4 Heat Pump No Subcooling Image Source: http://www.dc429.4shared.com/doc Saturated Liquid Line Saturated Vapor Line Slide 5 Heat Pump With Subcooling Image Source: http://www.dc429.4shared.com/doc Qsubcooler Qevaporator_additional All Saturated Liquid After Passing Through EEV Slide 6 Latent & Sensible Heat Slide 7 Subcooler Coil Output Slide 8 What is Coefficient of Performance? Slide 9 ` Without Subcooling ` With Subcooling COP=3 COP=4 C.O.P. for the Visual Learners Slide 10 C.O.P. Due to Subcooling At Least 20F Subcooling Needed to be Beneficial Slide 11 Compressor EER Slide 12 Air Outlet Temperature Slide 13 Capstone Plan 1. Build Subcooler Unit (Jan-Feb 2014) 2. I nstall at University Garage (Feb 2014) 1 ton Fujitsu Mini-Split Heat Pump GE GeoSpring Hybrid Water Heater Subcooler Unit 3. Monitor & Improve!! Slide 14 Key Components Image Source: http://www.amazon.comImage Source: http://greenenergymaine.com Fujitsu 12RLS2 (1 ton) GE GeoSpring Slide 15 Important Features Centrifugal Duct FanMicro-Channel Coil Slide 16 Connect Liquid Refrigerant Line Saturated Liquid From Indoor Unit Subcooled Liquid to Outdoor Unit Airstream Flows Over Coil Slide 17 GE GeoSpring Actuated Louvers 10 Square Duct 8 Round Duct Centrifugal Fan Slide 18 Solid Model Slide 19 Slide 20 Combine Together 1. Deliver Heated Airstream to GeoSpring Intake 2. Heated Airstream Will Diffuse Into Garage if GeoSpring is not Running Slide 21 University Facilities Garage Image Source: https://maps.google.com/maps Slide 22 Estimated Cost (With Rebates) 1. Subcooler Unit 2. Fujitsu 12RLS2 3. GE GeoSpring 4. Installation 5. Total Capital Cost = $1000.00 = $1600.00 = $700.00 = $1400.00 = $4700.00 Slide 23 Payback Period 1. How will The Subcooler Save Money? 2. By increasing the performance of the Heat Pump! 3. COP With Subcooling > COP No Subcooling Slide 24 Payback Period Equation derived with help from Peter Talmage. Slide 25 Payback Period 1. Price of Electricity=$0.16/kWh* 2. 4817 Hours of Operation Per Year** Sources: (* Bangor Hydro ** James LaBrecque) Slide 26 Payback Period Payback Period* = 24.4 Years Slide 27 Motivation Source: Google Patents Slide 28 Motivation 1. THEIR TECHNOLOGY: ADDITIONAL CONDENSER, EXPANSION VALVE, EVAPORATOR, AND COMPRESSOR 2. OUR TECHNOLOGY: ONE ADDITIONAL COIL. Slide 29 Summary 1. Subcooler Unit Increases Heat Pumps COP & EER 2. University of Maine Facilities Garage 3. Monitor Installation: Fujitsu Mini-Split Heat Pump Geospring Hybrid Water Heater Subcooler Unit 4. Improve Design! Slide 30 Final Marketable Product $$$ 1. Mass Produce as an Accessory for Heat Pump 2. Minimal Installation Time for HVAC Technician 3. Customize Where Heated Airstream is Delivered 4. Free Heat Is Currently Being Wasted!! Slide 31 Thank You For Your Time!