Solar Thermal Final

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Author:
oaboss
ID:
272778
Filename:
Solar Thermal Final
Updated:
2014-05-04 17:57:40
Tags:
Solar Thermal
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Description:
Solar Thermal Final Study
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  1. Categorization of Glycol System?
    Active/Passive
    Indirect/Direct
    • Active: Pumps
    • Indirect: Heat Exchanger
  2. Major Components of Glycol System?
    4 total
    • Collector
    • Pumps
    • Heat Exchanger
    • Storage
    • Differential Controller
  3. Minor Components of Glycol System?
    7 possible name 5
    • Relief Valves
    • --Pressure ( top)
    • --Temp & Pres. (down low)
    • Check Valve
    • Expansion Tank
    • Filling assembly
    • Tempering Valve
    • T&P Guages
    • Air purge Valve
  4. Filling Assembly for Glycol system includes which 3 components?
    • Drain
    • Check
    • Fill
  5. Always keep hot side _____. Y?
    • Clean.
    • Less heat loss;component lifetime
  6. Always mount pumps Vertically/horizontally?
    Vertically
  7. With a tube-n-shell heat exchanger the htf should  always be on the inside/outside?
    inside
  8. Pros  of  Glycol System?
    Name 3 of 4
    • Freeze Protection
    • Less expensive pumps
    • Smaller pipe
    • Power and control
    • Easier to retrofit
  9. Cons of Glycol System?
    Name 3 of 4
    • Will leak eventually
    • Must be charged
    • Has lots of moving parts
    • Must avoid stagnation
  10. How  to prevent Stagnation in Glycol System?
    • Steamback
    • Vacation Valve
  11. DrainBack systems  are catagorized as?
    Active/Passive
    Indirect/Direct
    • Active
    • Indirect
  12. List 3 of 4 differences between Drainback and Glycol Systems?
    • DrainBack is:
    • Pressurized
    • HTF is inside house when  not circulating
    • Can use distilled water as (htf)
    • larger land sloped pipe
  13. Why use a DrainBack System? Name 2?
    • Can eliminate overheating
    • Better Performance
    • --Water heat capacity
  14. Major Components of Drainback?
    • Collector
    • DrainBack Tank
    • Circulating Pumps
    • Heat Exchanger
    • Storage
    • Differential Controller
  15. Minor Components of DrainBack?
    • Level Meter
    • Temp Guage
  16. Drawback to Drainback System?
    Larger Pumps
  17. Pros of Drainback?
    • Outperform Glycol
    • Components last longer
    • Easy to maintain
    • Leaks better tolerated
  18. What is static head?
    The pressure or height of a liquid
  19. How much psi must there be to lift 30ft of water?
    2.31ft/psi
    30/2.31= 13 psi
  20. What is Dynamic Head?
    Friction between moving fluid and pipes opposes flow
  21. What effects dynamic head in pipes and fluid?
    • pip material
    • diameter and length
    • # of bends
    • Fluid: Viscosity
  22. What is total head?
    Static head+dynamic head
  23. A pressure gauge on a system with moving liquid will read dynamic or static head?
    Reads total head
  24. Dynamic head in a Pressurized system is typically greater or less than static head? What about unpressurized?
    • Pressurized:
    • Dynamic > static
    • Unpressurized:
    • Static> dynamic
  25. Catagories and uses of collectors?
    • Low: Pool heating
    • Medium: Hot water, space heating
    • High: Utility and commerical
  26. Flat plate collectors utilize what to increase effective area?
    absorber plates
  27. Glazing on flat plate collector helps  to reduce heat loss in what 3 ways?
    • Conduction-Warmed air next to risers
    • Convection-Keeps warm air from being replaced by cold
    • Radiation-Allows incident radiation in but does not let reflected radiation out (greenhouse)
  28. Compound Parabolic Concentrator collectors are catagorized by?
    Incident angle modifier
  29. Evacuated Tube collectors Pros?
    • Better  for  high temp applications
    • Perform better on cloudy days
    • easy to install
    • easily repaired and replaced
  30. Extranalities
    Cost or benefit that affects a party that does not choose to be affected by situation

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