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

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Presentation on theme: "Subcooling Mini-Split Senior Capstone Design Bangor Hydro Presentation 12/17/13 Samuel Prentiss Matt Strong Bruce Tuttle."— Presentation transcript:

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

2 Tonight’s Points 1. Subcooling Heat Pump 2. Installation & Testing 3. Return on Investment 4. Marketable Product

3 The Heat Pump Cycle Image Source: R-410A Vapor Condenses R-410A Liquid Evaporates R-410A Vapor Compressed R-410A Liquid Expands

4 Heat Pump – No Subcooling Image Source: Saturated Liquid Line Saturated Vapor Line

5 Heat Pump – With Subcooling Image Source: Qsubcooler Qevaporator_additional All Saturated Liquid After Passing Through EEV

6 Latent & Sensible Heat

7 Subcooler Coil Output

8 What is Coefficient of Performance?

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

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 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!!

14 Key Components Image Source: Source: Fujitsu 12RLS2 (1 ton) GE GeoSpring

15 Important Features Centrifugal Duct FanMicro-Channel Coil

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

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

18 Solid Model

19

20 Combine Together 1. Deliver Heated Airstream to GeoSpring Intake 2. Heated Airstream Will Diffuse Into Garage if GeoSpring is not Running

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

22 Estimated Cost (With Rebates) 1. Subcooler Unit 2. Fujitsu 12RLS2 3. GE GeoSpring 4. Installation 5. Total Capital Cost = $ = $ = $ = $ = $

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”

24 Payback Period Equation derived with help from Peter Talmage.

25 Payback Period 1. Price of Electricity=$0.16/kWh* Hours of Operation Per Year** Sources: (* Bangor Hydro ** James LaBrecque)

26 Payback Period Payback Period* = 24.4 Years

27 Motivation Source: Google Patents

28 Motivation 1. THEIR TECHNOLOGY: ADDITIONAL CONDENSER, EXPANSION VALVE, EVAPORATOR, AND COMPRESSOR 2. OUR TECHNOLOGY: ONE ADDITIONAL COIL.

29 Summary 1. Subcooler Unit Increases Heat Pump’s 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!

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!!

31 Thank You For Your Time!


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