SOLAR2012_0451_presentation

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					 Geyser Pump Modeling for
  Solar Hot Water Heater
System Design Optimization
          Lucas Witmer
        LWitmer@psu.edu

              Qi Zhang
           Susan Stewart
       Jeffrey R. S. Brownson
                Overview

 Introduction
 Solar Water Heating Systems
 Critical Parameters and Equations
 Engineering Equation Solver (EES) Results
 TRNSYS Results
 Discussion and Conclusion
 Acknowledgements
Solar Water Heating Systems (SWHS)


 2-types of SWHS
   Active
     Mechanical energy input
      for pump
   Passive
     Natural Convection
     Cost and Energy Efficient
Solar Flat Plate Panel
How can we move water
 to a higher elevation
     without using
    electric pumps?
Thermosyphon
          Geyser Pump System


 Bubble pump
  coffee maker
     http://dai.ly/fXinRv
            Critical Parameters


   Diameter of tube
   Numbers of tubes
   Liquid mass flow rate
   Surface tension
            Important Equations


 Momentum Equation +
  Conservation of Mass
            L Do V1
                2
    H 
            D 2V2
 Drift flux model-Void
  Fraction


 de Cachard & Delhaye
  Correlation
   Drift Velocity – Vgj
   Distribution Parameter - Co
 Two-Phase Flow Patterns


                           Transformation Equation




As Temperature Increase
Flow Rate Regime Map
EES Results
EES Results (continued)
TRNSYS Model & Results
TRNSYS Results (continue)
TRNSYS Results (continue)
   Conclusion/ Future Study


 Benchmarking TRNSYS against data
 Important parameters
  Diameter
  Pressure of the System
  Numbers of lift tubes


 TRNSYS Results for longer time period
      Acknowledgements


 Coauthors
  Ms. Qi Zhang
  Dr. Susan Stewart
  Dr. Jeffrey Brownson
 Sunnovation – Geyser Pump SWH
  System Company
Questions?

				
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posted:11/20/2012
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