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SOLAR ENERGY SYSTEMS
AIR CONDITIONING & HEAT PUMP SYSTEMS
AIR LEAK MINIMIZATION
AIR LEAK SEALING PROCEDURE
AIR SEALING STRATEGIES
BIOGAS PRODUCTION & USE
EVAPORATIVE COOLING SYSTEMS
FLOOR POURED FINISH ON CONCRETE SLABS
FLOOR RADIANT HEAT Mistakes to Avoid
FRAMING DETAILS for BETTER INSULATION
FRAMING DETAILS for DOUBLE WALL HOUSES
FRAMING METAL STUD PERFORMANCE
FREEZE-PROOF A BUILDING
FROST HEAVES, FOUNDATION, SLAB
GREEN BUILDING CONSTRUCTION CODES GUIDES
GREENHOUSE DESIGN for SOLAR HEATING
GREENHOUSE / SUNSPACE GLARE
HEAT LOSS in BUILDINGS
HEAT LOSS DETECTION TOOLS
HEAT LOSS INDICATORS
HEAT LOSS PREVENTION PRIORITIES
HEAT LOSS R U & K VALUE CALCULATION
HEAT LOSS RATE CALCULATIONS
HEATING SMALL LOADS
HOUSEWRAP INSTALLATION DETAILS
HUMIDITY LEVEL TARGET
INSULATION IDENTIFICATION GUIDE
INSULATION LOCATION - WHERE TO PUT IT
LEED GREEN BUILDING CERTIFICATION
LEED Building Designation & IAQ
RADIANT SLAB FLOORING CHOICES
RADIANT SLAB TUBING & FLUID CHOICES
ROOF VENTILATION SPECIFICATIONS
ROOF ICE DAM LEAKS
SHEATHING, FOIL FACED - VENTS
SOLAR ENERGY SYSTEMS
SWEATING (CONDENSATION) on PIPES, TANKS
THERMAL EXPANSION of HOT WATER
THERMAL EXPANSION of MATERIALS
THERMAL IMAGING, THERMOGRAPHY
THERMAL MASS in BUILDINGS
THERMAL TRACKING & HEAT LOSS
VAPOR BARRIERS & CONDENSATION in BUILDINGS
VAPOR BARRIERS & HOUSEWRAP
VAPOR CONDENSATION & BUILDING SHEATHING
VENTILATION in BUILDINGS
WIND ENERGY SYSTEMS
WIND TURBINES & LIGHTNING
WINDOWS & DOORS
WINTERIZE A BUILDING
This article discusses the relative efficiency of different types of solar collectors, including a comparison of the effectiveness of Unglazed flat plate solar collectors, single glazed flat plate solar collectors, double glazed flat plate solar collectors, conventional stationary solar collector, evacuated flat plate solar collector, advanced stationary solar collector, tracking parabolic trough solar collectors.
Graph of solar collector type efficiency curves (solar collector efficiency is on the vertical axis) at page top and accompanying text are reprinted/adapted/excerpted with permission from Solar Age Magazine - editor Steven Bliss.
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Comparing the Efficiency of Tracking, non-Tracking Solar Collectors & Flat-Plate vs Evacuated-Tube Solar Collectors
What is the percent difference in solar energy collecting efficiency between tracking and non-tracking solar collectors?
What is the percent difference in solar energy collection efficiency between flat-plate and evacuated-tube solar collector arrays?
-- Michael Jackson, Alliance OH
The accompanying graph, from a publication of Canada's National Research Council, shows solar collector efficiency curves for three kinds of flat plate solar collector, two types of stationary concentrating solar collector, and a tracking parabolic-trough concentrating solar collector.
Solar collector efficiency is shown on the left vertical axis in the graph.
As you can see, differences in solar collector efficiency depend on the temperature range in which the solar collectors will be operating.
Unless you plan to use the solar collectors for high-temperature applications and are willing to pay for more complex solar equipment that will produce higher efficiencies, you may be better off with less expensive stationary flat-plate collectors.
(See "Rising Hopes for Vacuum Tube Solar Collectors", Solar Age 6/82.)
Below we include references to additional and current solar collector efficiency studies at Solar Collector Efficiency Study
The question-and-answer article about efficiency differences among different types of solar collectors provides historical solar collector efficiency data from the 1980's and, quotes-from, updates, and comments an original article from Solar Age Magazine and written by Steven Bliss.
The link to the original Q&A article in PDF form immediately below is provided by the above expanded/updated online version of this article.
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