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Solar Thermal Final
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Categorization of Glycol System?
Active/Passive
Indirect/Direct
Active
: Pumps
Indirect
: Heat Exchanger
Major Components of Glycol System?
4 total
Collector
Pumps
Heat Exchanger
Storage
Differential Controller
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
Filling Assembly for Glycol system includes which 3 components?
Drain
Check
Fill
Always keep hot side _____. Y?
Clean.
Less heat loss;component lifetime
Always mount pumps Vertically/horizontally?
Vertically
With a tube-n-shell heat exchanger the htf should always be on the inside/outside?
inside
Pros of Glycol System?
Name 3 of 4
Freeze Protection
Less expensive pumps
Smaller pipe
Power and control
Easier to retrofit
Cons of Glycol System?
Name 3 of 4
Will leak eventually
Must be charged
Has lots of moving parts
Must avoid stagnation
How to prevent Stagnation in Glycol System?
Steamback
Vacation Valve
DrainBack systems are catagorized as?
Active/Passive
Indirect/Direct
Active
Indirect
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
Why use a DrainBack System? Name 2?
Can eliminate overheating
Better Performance
--Water heat capacity
Major Components of Drainback?
Collector
DrainBack Tank
Circulating Pumps
Heat Exchanger
Storage
Differential Controller
Minor Components of DrainBack?
Level Meter
Temp Guage
Drawback to Drainback System?
Larger Pumps
Pros of Drainback?
Outperform Glycol
Components last longer
Easy to maintain
Leaks better tolerated
What is static head?
The pressure or height of a liquid
How much psi must there be to lift 30ft of water?
2.31ft/psi
30/2.31= 13 psi
What is Dynamic Head?
Friction between moving fluid and pipes opposes flow
What effects dynamic head in pipes and fluid?
pip material
diameter and length
# of bends
Fluid
: Viscosity
What is total head?
Static head+dynamic head
A pressure gauge on a system with moving liquid will read dynamic or static head?
Reads total head
Dynamic head in a Pressurized system is typically greater or less than static head? What about unpressurized?
Pressurized:
Dynamic > static
Unpressurized:
Static> dynamic
Catagories and uses of collectors?
Low
: Pool heating
Medium
: Hot water, space heating
High
: Utility and commerical
Flat plate collectors utilize what to increase effective area?
absorber plates
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)
Compound Parabolic Concentrator collectors are catagorized by?
Incident angle modifier
Evacuated Tube collectors Pros?
Better for high temp applications
Perform better on cloudy days
easy to install
easily repaired and replaced
Extranalities
Cost or benefit that affects a party that does not choose to be affected by situation
Author
oaboss
ID
272778
Card Set
Solar Thermal Final
Description
Solar Thermal Final Study
Updated
2014-05-04T21:57:40Z
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