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Renewable Energy: Films to Increase Solar Collector Efficiency?
- POST a QUESTION or COMMENT about the effect of films on solar collector efficiency
Do light-transmitting, heat reflecting films offer efficiency gains for solar collectors? Use of widow films such as Heat Mirror, 3-M's Scotchtint, or Sungain to boost solar collector efficiency.
This article discusses the question of whether or not thin window films designed to control heat and solar gain can improve the efficiency of solar collectors. Text is reprinted/adapted/excerpted with permission from Solar Age Magazine - editor Steven Bliss.
Photo a rooftop mounted site-built solar collector at page top courtesy of Bob Cheney.
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Light-Transmitting, Heat-Reflecting Films: Should I Use on Solar Collectors?
The question-and-answer article about the indoor use of heat-reflecting window films to increase the efficiency of a solar collector, quotes-from, updates, and comments an original article from Solar Age Magazine and written by Steven Bliss.
Question: Could low-transmission films such as 3M's Scotchtint™ or Heat Mirror™ be used to increase the efficiency of Solar Collectors?
I have heard a lot about light-transmitting, heat-reflecting widow films, such as Heat Mirror™ and 3-M's Scotchtint™. These would seem to be ideal materials for use in solar collector glazings to reduce heat loss. Could these be used in addition to black chrome to improve solar collector efficiency? Are there any solar collector manufacturers using such films in their collectors? - H.M., Bowie MD
Answer:
Low-transmission films such as Scotchtint™ were developed to block solar transmission through window glass into the building interior, avoiding un-wanted heat gain in some buildings. Low-transmission, heat reflecting films would not help solar collector efficiency.
The high-transmission, low-emissivity films such as Heat Mirror™ or 3-M's Sungain™ might boost solar collector efficiencies in some applications, particularly high-temperature collectors in cold climates. In this case, the added insulation value of the film might offset the transmission losses. The actual efficiency gains for the solar collector may still not justify the added expense.
As these products were developed for building glazings (windows), their durability in solar collector applications is in question. The effects of high temperatures, thermal cycling, and high UV exposure on the window glazing film had (in the 1980's) only been studied in a preliminary way. 3M informed us that its Sungain film will become brittle at temperatures above 250 degF., prohibiting its use in some solar collector applications.
While we know of no manufacturer using such films in their solar collectors, we have heard of some experiments in this direction.
Here we include solar energy, solar heating, solar hot water, and related building energy efficiency improvement articles reprinted/adapted/excerpted with permission from Solar Age Magazine - editor Steven Bliss.
Original article: Solar Age Magazine Articles on Renewable Energy, Energy Savings, Construction Practices.
- Q&A on use of Heat Mirror™ or 3-M Scotchtint™ on Solar Collectors - original text. Use your browser's back button to return to this page
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Continue reading at SUNGAIN, FILMS, LOW-E GLASS or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX.
Or see these
Sunspace & Solar Glazing & Shading Articles
- GLASS vs HEAT MIRROR SOLAR GAIN/Loss
- GREENHOUSE DESIGN for SOLAR HEATING
- GREENHOUSE or SOLARIUM INSULATION
- GREENHOUSE / SUNSPACE GLARE
- LOW-E VS QUAD-GLAZING
- SOLAR COLLECTOR FILMS more up to date information about the performance of films to increase solar collector efficiency
- SOLAR GAIN CALCULATION
- SOLAR SHADES & SUNSCREENS
- SOLAR SHADES, LOW-E EFFECTIVENESS
- SPONTANEOUS GLASS BREAKAGE NiS
- SUNGAIN, FILMS, LOW-E GLASS for details about use of Sungain film on windows and window film selection and installation
- SUNSPACE GLAZING for SUNTANNING
- WINDOWS & DOORS, AGE, TYPESour home page for window and door information.
- WINDOW INSULATION OPTIONS
Suggested citation for this web page
SOLAR COLLECTOR FILMS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.
Or see this
INDEX to RELATED ARTICLES: ARTICLE INDEX to SOLAR ENERGY
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Citations & References
In addition to any citations in the article above, a full list is available on request.
- Solar Age Magazine was the official publication of the American Solar Energy Society. The contemporary solar energy magazine associated with the Society is Solar Today. "Established in 1954, the nonprofit American Solar Energy Society (ASES) is the nation's leading association of solar professionals & advocates. Our mission is to inspire an era of energy innovation and speed the transition to a sustainable energy economy. We advance education, research and policy. Leading for more than 50 years. ASES leads national efforts to increase the use of solar energy, energy efficiency and other sustainable technologies in the U.S. We publish the award-winning SOLAR TODAY magazine, organize and present the ASES National Solar Conference and lead the ASES National Solar Tour – the largest grassroots solar event in the world."
- Steve Bliss's Building Advisor at buildingadvisor.com helps homeowners & contractors plan & complete successful building & remodeling projects: buying land, site work, building design, cost estimating, materials & components, & project management through complete construction. Email: info@buildingadvisor.com
Steven Bliss served as editorial director and co-publisher of The Journal of Light Construction for 16 years and previously as building technology editor for Progressive Builder and Solar Age magazines. He worked in the building trades as a carpenter and design/build contractor for more than ten years and holds a masters degree from the Harvard Graduate School of Education. Excerpts from his recent book, Best Practices Guide to Residential Construction, Wiley (November 18, 2005) ISBN-10: 0471648361, ISBN-13: 978-0471648369, appear throughout this website, with permission and courtesy of Wiley & Sons. Best Practices Guide is available from the publisher, J. Wiley & Sons, and also at Amazon.com - Thanks to professional inspector Bob Cheney for the photo of a site-built rooftop solar collector.
- PASSIVE SOLAR DESIGN HANDBOOK VOLUME II [PDF], the Passive Solar Handbook Comprehensive Planning Guide, in a version used by the U.S. Air Force - online version available at this link and from the USAF also at wbdg.org/ccb/AF/AFH/pshbk_v2.pdf [This is a large PDF file that can take a while to load]
- PASSIVE SOLAR HANDBOOK VOLUME III [PDF], the Passive Solar Handbook Programming Guide, in a version used by the U.S. Air Force - online version available at this link and from the USAF also at wbdg.org/ccb/AF/AFH/pshbk_v3.pdf
- The Passive Solar Design and Construction Handbook, Steven Winter Associates (Author), Michael J. Crosbie (Editor), Wiley & Sons, ISBN 978-047118382 or 0471183083
- "PASSIVE SOLAR HOME DESIGN [PDF] ", U.S. Department of Energy, describes using a home's windows, walls, and floors to collect and store solar energy for winter heating and also rejecting solar heat in warm weather.
- SOLAR WATER HEATERS [PDF] , U.S. Department of Energy article on solar domestic water heaters to generate domestic hot water in buildings, explains how solar water heaters work. Solar heat for swimming pools is also discussed.
- HEAT EXCHANGERS for SOLAR WATER HEATING SYSTEMS [PDF], U.S. DOE describes the types of solar water heater heat exchange methods between the sun and the building's hot water supply
- HEAT-TRANSFER FLUIDS for SOLAR WATER HEATING SYSTEMS [PDF] , U.S. DOE, describes the types of fluids selected to transfer heat between the solar collector and the hot water in storage tanks in a building. These include air, water, water with glycol antifreeze mixtures (needed when using solar hot water systems in freezing climates), hydrocarbon oils, and refrigerants or silicones for heat transfer.
- SOLAR WATER HEATING SYSTEM MAINTENANCE & REPAIR [PDF] , U.S. DOE
- SOLAR WATER HEATING SYSTEM FREEZE PROTECTION [PDF] , U.S. DOE,using antifreeze mixture in solar water heaters (or other freeze-resistant heat transfer fluids), as well as piping to permit draining the solar collector and piping system.
- US DOE, SCALING AND CORROSION IN SOLAR WATER HEATING SYSTEMS, U.S. Department of Energy.
- US DOE, ACTIVE SOLAR HEATING SYSTEMS [PDF], U.S. Department of Energy
- US DOE, RADIANT HEATING SYSTEMS, U.S. Department of Energy
- ABSORPTION HEAT PUMPS & COOLERS [PDF] , U.S. DOE
- SOLAR AIR HEATING [PDF] U.S. DOE also referred to as "Ventilation Preheating" in which solar systems use air for absorbing and transferring solar energy or heat to a building
- SOLAR LIQUID HEATING [PDF] U.S. DOE, systems using liquid (typically water) in flat plate solar collectors to collect solar energy in the form of heat for transfer into a building for space heating or hot water heating. The term "solar liquid" is used for accuracy, rather than "solar water" because the water may contain an antifreeze or other chemicals.
- "China Leading Race to Make Clean Energy", Keith Bradsher, The New York Times, 01/31/2010, p1, p10.
- Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the InspectAPedia Bookstore. Also see our Book Reviews - InspectAPedia.
- In addition to citations & references found in this article, see the research citations given at the end of the related articles found at our suggested
CONTINUE READING or RECOMMENDED ARTICLES.
- Carson, Dunlop & Associates Ltd., 120 Carlton Street Suite 407, Toronto ON M5A 4K2. Tel: (416) 964-9415 1-800-268-7070 Email: info@carsondunlop.com. Alan Carson is a past president of ASHI, the American Society of Home Inspectors.
Thanks to Alan Carson and Bob Dunlop, for permission for InspectAPedia to use text excerpts from The HOME REFERENCE BOOK - the Encyclopedia of Homes and to use illustrations from The ILLUSTRATED HOME .
Carson Dunlop Associates provides extensive home inspection education and report writing material. In gratitude we provide links to tsome Carson Dunlop Associates products and services.
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