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Evaluating Low-E Coatings for HET: Performance and Conclusions

This document presents a thorough analysis of Low-E coatings for the HET project, discussing the performance, installation, and long-term maintenance of various coatings, particularly aluminum foil and LO/MIT. Key findings indicate that aluminum foil performed 2-5 times closer to ambient temperatures in most measurements. The study emphasizes the ease of application, durability, and cost-effectiveness of aluminum foil compared to LO/MIT, highlighting maintenance realities and aesthetic considerations. Conclusions recommend aluminum foil as a superior choice for various applications within observatories.

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Evaluating Low-E Coatings for HET: Performance and Conclusions

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  1. Low-E Coatings for HETData & Conclusions2 October 2002John Good

  2. Ambient 9ft. Ambient 86ft. Ambient 9ft. Foil Passing through Louvers? LO/MIT TiO2

  3. Ambient 9ft. Ambient 86ft. Foil Ambient 9ft. Foil LO/MIT Ambient 86ft. TiO2

  4. Ambient 9ft. Ambient 9ft. Ambient 86ft. Ambient 86ft. Foil Passing through Louvers? LO/MIT TiO2

  5. Ambient 9ft. Ambient 86ft. Ambient 9ft. Passing through Louvers? Foil Passing through Louvers? LO/MIT TiO2

  6. LO/MIT Durability Tests Shoe Scuff Finger Nail Scratch

  7. LO/MIT Durability Tests

  8. LO/MIT Durability Tests

  9. LO/MIT Durability Tests Shoe Scuff

  10. LO/MIT Durability Tests

  11. Conclusions ALUMINUM FOIL IS RECOMMENDED COATING: • Performance - Foil • Al Foil stays 2-5 times closer to ambient temperature in 3 out of 4 measurements. • Installation – LO/MIT • Both coatings are easily prepped and applied. • Long Term - Foil • Foil will probably stay cleaner than the soft & rougher surface of LO/MIT. • Adhesion of foil is very good with no de-lamination problems reported by other Observatories. • Assuming the foil ever becomes “heavily oxidized”, it will perform as well as a fresh, clean coating of LO/MIT. • Maintenance - Foil • Recoating of LO/MIT will be a given every 5-7 years. • Multiple layers of gummy coatings. • LO/MIT is a permanent decision. • No other coating can be applied on top of LO/MIT. • Removable only with solvents – power wash won’t do the trick. • Al foil can be be re-laminated. • Much easier if the adhesive lasts since removal of old layer would be difficult. • No problems reported so far. • Aesthetics – Foil • Cost – LO/MIT (both costs are reasonable) • Aluminum Tape: $35-37k • $22k (tape & primer) + Labor (~6-8 man-weeks) + $7k (125ft. Man-lift) + $1.5k (Misc. Supplies). • LO/MIT: $19-21k • $5.5k (paint) + Labor (~6-8 man-weeks) + $7k (125ft. Man-lift) + $1,500 (Misc. Supplies).

  12. DIMM Tower Foundation • Poured last Friday. • 15 tons of concrete. • Good work McDonald Physical Plant!

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