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S ubcooling Mini-Split Senior Capstone Design

S ubcooling Mini-Split Senior Capstone Design. Samuel Prentiss Matt Strong Bruce Tuttle. Bangor Hydro Presentation. 12/17/13. Tonight’s Points. Subcooling Heat Pump Installation & Testing Return on Investment Marketable Product. The Heat Pump Cycle. R-410A Vapor Condenses.

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S ubcooling Mini-Split Senior Capstone Design

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  1. Subcooling Mini-SplitSenior Capstone Design Samuel Prentiss Matt Strong Bruce Tuttle Bangor Hydro Presentation 12/17/13

  2. Tonight’s Points • Subcooling Heat Pump • Installation & Testing • Return on Investment • Marketable Product

  3. The Heat Pump Cycle R-410A Vapor Condenses R-410A Vapor Compressed R-410A Liquid Evaporates R-410A Liquid Expands Image Source: http://www.air-conditioning-and-refrigeration-guide.com/

  4. Heat Pump – No Subcooling Saturated Liquid Line Saturated Vapor Line Image Source: http://www.dc429.4shared.com/doc

  5. Heat Pump – With Subcooling Qsubcooler All Saturated Liquid After Passing Through EEV Qevaporator_additional Image Source: http://www.dc429.4shared.com/doc

  6. Latent & Sensible Heat • Vapor R-410A Condensating is Latent Heat () • Latent Heat is Constant Temperature • Evaporation is Latent • Liquid R-410A Subcooling is Sensible Heat • Sole Effect is Temperature Change • Superheating is Sensible

  7. Subcooler Coil Output

  8. What is Coefficient of Performance? • 3 • 4 • Does Not Change!

  9. C.O.P. for the Visual Learners “Without Subcooling” ` COP=3 “With Subcooling” ` COP=4

  10. C.O.P. Due to Subcooling At Least 20F Subcooling Needed to be Beneficial

  11. Compressor EER

  12. Air Outlet Temperature

  13. Capstone Plan • BuildSubcooler Unit (Jan-Feb 2014) • Install at University Garage (Feb 2014) • 1 ton Fujitsu Mini-Split Heat Pump • GE GeoSpring Hybrid Water Heater • Subcooler Unit • Monitor & Improve!!

  14. Key Components Fujitsu 12RLS2 (1 ton) GE GeoSpring Image Source: http://www.amazon.com Image Source: http://greenenergymaine.com

  15. Important Features Micro-Channel Coil Centrifugal Duct Fan

  16. Connect Liquid Refrigerant Line Airstream Flows Over Coil Saturated Liquid From Indoor Unit SubcooledLiquid to Outdoor Unit

  17. Centrifugal Fan 10” Square Duct 8” Round Duct GE GeoSpring Actuated Louvers

  18. Solid Model

  19. Combine Together • Deliver Heated Airstream to GeoSpring Intake • Heated Airstream Will Diffuse Into Garage if GeoSpring is not Running

  20. University Facilities Garage Image Source: https://maps.google.com/maps

  21. Estimated Cost (With Rebates) • Subcooler Unit • Fujitsu 12RLS2 • GE GeoSpring • Installation • Total Capital Cost = $1000.00 = $1600.00 = $700.00 = $1400.00 = $4700.00

  22. Payback Period • How will The Subcooler Save Money? • By increasing the performance of the Heat Pump! • COP“With Subcooling” > COP “No Subcooling”

  23. Payback Period Equation derived with help from Peter Talmage.

  24. Payback Period • Price of Electricity=$0.16/kWh* • 4817 Hours of Operation Per Year** Sources: (* Bangor Hydro ** James LaBrecque)

  25. Payback Period Payback Period* = 24.4 Years

  26. Motivation Source: Google Patents

  27. Motivation • THEIR TECHNOLOGY: ADDITIONAL CONDENSER, EXPANSION VALVE, EVAPORATOR, AND COMPRESSOR • OUR TECHNOLOGY: ONE ADDITIONAL COIL.

  28. Summary • Subcooler Unit Increases Heat Pump’s COP & EER • University of Maine Facilities Garage • Monitor Installation: • Fujitsu Mini-Split Heat Pump • Geospring Hybrid Water Heater • Subcooler Unit • Improve Design!

  29. Final Marketable Product $$$ • Mass Produce as an Accessory for Heat Pump • Minimal Installation Time for HVAC Technician • Customize Where Heated Airstream is Delivered • Free Heat Is Currently Being Wasted!!

  30. Thank You For Your Time!

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