Heat Pump – No Subcooling Image Source: Saturated Liquid Line Saturated Vapor Line
Heat Pump – With Subcooling Image Source: Qsubcooler Qevaporator_additional All Saturated Liquid After Passing Through EEV
Latent & Sensible Heat
Subcooler Coil Output
What is Coefficient of Performance?
` “Without Subcooling” ` “With Subcooling” COP=3 COP=4 C.O.P. for the Visual Learners
C.O.P. Due to Subcooling At Least 20F Subcooling Needed to be Beneficial
Air Outlet Temperature
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!!
Important Features Centrifugal Duct FanMicro-Channel Coil
Connect Liquid Refrigerant Line Saturated Liquid From Indoor Unit Subcooled Liquid to Outdoor Unit Airstream Flows Over Coil
GE GeoSpring Actuated Louvers 10” Square Duct 8” Round Duct Centrifugal Fan
Combine Together 1. Deliver Heated Airstream to GeoSpring Intake 2. Heated Airstream Will Diffuse Into Garage if GeoSpring is not Running
University Facilities Garage Image Source: https://maps.google.com/maps
Estimated Cost (With Rebates) 1. Subcooler Unit 2. Fujitsu 12RLS2 3. GE GeoSpring 4. Installation 5. Total Capital Cost = $ = $ = $ = $ = $
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”
Payback Period Equation derived with help from Peter Talmage.
Payback Period 1. Price of Electricity=$0.16/kWh* Hours of Operation Per Year** Sources: (* Bangor Hydro ** James LaBrecque)
Payback Period Payback Period* = 24.4 Years
Motivation Source: Google Patents
Motivation 1. THEIR TECHNOLOGY: ADDITIONAL CONDENSER, EXPANSION VALVE, EVAPORATOR, AND COMPRESSOR 2. OUR TECHNOLOGY: ONE ADDITIONAL COIL.
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!
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!!