The Solar Kegerator

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The Solar Kegerator

• Thermal Fluids II
• Brianna Beconovch
• Nick Azadian
• Lindsay Hardy
• Michael LaBeach

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Solution Requirements

• Run on efficient refrigeration cycle
• Input power gt 50 Watts
• House large amount of liquid
• Keep beverage cool for 4-6 hours
• Environmental no emissions
• Sleek, mobile design wheels, mobile power
  source,
• not cumbersome, no extruding components

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Proposals

• Three Refrigeration Prototypes
• Half Barrel
• Slim Quarter
• Pony Keg
• Three Power Systems
• Photovoltaic (Solar)
• Battery
• Wall
• Refrigeration Cycle
• Vapor compression

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Components
Figure 10 CO2 tank, regulator, keg coupler, and
tubing.
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Assembly
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Assumptions

• An Ideal-Vapor Compression Cycle

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Properties Given

• Converted to absolute pressure

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State Properties
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Power Consumption

• For Given
• Determine electric power consumption

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Assumptions

• Steady state values temperature, heat, volume.
• There is a specific amount of heat entering the
  system.
• Natural convection considered for the interior
  and exterior.
• Constant Material properties.
• Geometry.
• Nominal changes in Thermal Properties of air.

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Thermal Conductivity
Our Thermal Resistance were based off actual
studies conducted by Oak Ridge National
Laboratories of an aging Polyurethane material
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Natural Convection Analysis

• Volume Expansion Coefficient
• Grashof and Prandlt Number to evaluate Rayleigh
  number
• Convective Heat Transfer coefficient

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Analysis While the is Compressor Off
Qdotin
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Analysis While is Compressor ON
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Temperature Vs time
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Homer

• Energy Analysis Program
• Allows analysis for various systems

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Homer (Contd)

• Can analyze various components
• Our System

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Temperature and Load Vs Time
Temperature (K)
Load (kW)
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PV Power over Time
Load over Time
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References

• 1. Çengel, Yunus A., and Turner, Robert H.
  Fundamentals of Thermal fluid Sciences. 2nd
  
• edition. New York McGraw-Hill, 2005.
• 2. Incropera, Frank P., and David P. Dewitt.
  Fundamentals of Heat Transfer. New York John
  Wiley Sons, Inc., 1981.
• 3. K. E. Wilkes, D. W. Yarbrough, and F. J.
  Weaver, Aging of Polyurethane Foam
• Insulation in Simulated Refrigerator Walls,
  International Conference on Ozone
• Protection Technologies, pp.253-262 (1997).
• 4. "Homer." Energy Analysis. 11 Apr 2008
  lthttps//analysis.nrel.gov/homer/gt.
• 5. Young, Robert. Kegerator. 30 Nov 2007
  http//www.micromatic.com/draft-beer- edu/how-to-b
  uild-a-kegerator-aid-115.html.
• 6. Turner, Robert. Air Properties. Engineering
  toolbox. 30 Nov 2007
• http//www.engineeringtoolbox.com/air-properties-
  d_156.html.

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Summary

• Brief Demo
• Questions?
• Comments
• Thirsty?