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Subcooling Mini-Split Senior Capstone Design

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Presentation on theme: "Subcooling Mini-Split Senior Capstone Design"— Presentation transcript:

1 Subcooling Mini-Split Senior 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:

4 Heat Pump – No Subcooling
Saturated Liquid Line Saturated Vapor Line 𝑸 𝑯 = 𝑸 𝒄𝒐𝒏𝒅𝒆𝒏𝒔𝒆𝒓 𝑸 𝑳 = 𝑸 𝒆𝒗𝒂𝒑𝒐𝒓𝒂𝒕𝒐𝒓 𝑾 𝒊𝒏 = 𝑾 𝒄𝒐𝒎𝒑𝒓𝒆𝒔𝒔𝒐𝒓 Image Source:

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

6 Latent & Sensible Heat Vapor R-410A Condensating is Latent Heat ( ℎ 𝑓𝑔 ) 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?
𝐶𝑂𝑃 𝑛𝑜_𝑠𝑢𝑏𝑐𝑜𝑜𝑙𝑒𝑟 = 𝑄 𝑜𝑢𝑡 𝑊 𝑖𝑛 = 𝑄 𝑐𝑜𝑛𝑑𝑒𝑛𝑠𝑒𝑟 𝑊 𝑐𝑜𝑚𝑝𝑟𝑒𝑠𝑠𝑜𝑟 = 3 𝐶𝑂𝑃 𝑠𝑢𝑏𝑐𝑜𝑜𝑙𝑒𝑟 = 𝑄 𝑜𝑢𝑡 𝑊 𝑖𝑛 = 𝑄 𝑐𝑜𝑛𝑑𝑒𝑛𝑠𝑒𝑟 + 𝑄 𝑠𝑢𝑏𝑐𝑜𝑜𝑙𝑒𝑟 𝑊 𝑐𝑜𝑚𝑝𝑟𝑒𝑠𝑠𝑜𝑟 = 4 𝑾 𝒄𝒐𝒎𝒑𝒓𝒆𝒔𝒔𝒐𝒓 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 Build Subcooler Unit (Jan-Feb 2014) Monitor & Improve!!
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: Image Source:

15 Important Features Micro-Channel Coil Centrifugal Duct Fan

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

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

18 Solid Model


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

21 University Facilities Garage
Image Source:

22 Estimated Cost (With Rebates)
Subcooler Unit Fujitsu 12RLS2 GE GeoSpring Installation Total Capital Cost = $ = $ = $ = $ = $

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

24 Payback Period Equation derived with help from Peter Talmage.

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

26 Payback Period Payback Period* = 24.4 Years

27 Motivation Source: Google Patents


29 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!

30 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!!

31 Thank You For Your Time!

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