2 Responses to ““What’s wrong with using Rubatex to insulate solar thermal system piping?””


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  1. Steve E.

    As a professional tradesman, I’m so very impressed to your attention to promoting the highest quality installation possible. Now only does this approach bode well to your credibility in the product you make, it also shows an expectation that the end purchaser of the installation deserves peace of mind and confidence that they have the best value for their investment. Using the proper R value insulation and then covering it with an aluminum jacket and sealing it with caulk is high end for any job.

    An excellent article in the October 2011 edition of the ASHRAE Journal, the professional HVAC engineering society, highlighted the quick payback period for properly insulated piping components. You are absolutely right; if the wrong insulation components are installed and fail in short order, the installation begins to cost the customer money in “lost” energy and the dollars saved by are really just wasted. Trust me, nobody wants to spend more money doing the job over again because it wasn’t done right the first time. And I guarantee you, the original installer in these situations isn’t looking for repeat business or recommendations.

    Home run, Dr. Ben.

  2. Dear Dr. Ben
    Your contribution to the development of thermal solar systems and particular to the drain back system is very helpful. Your help is valuable. You are worthy of congratulation to advance your experience all over the world. In Greece the cost of oil is 1.50 €/liter. This cost creates an amortization between two and three years when using solar thermal systems. To improve my experience I would be very grateful if you could inform me the following.
    • What is the thickness of the aluminum covers of rock wool thermal insulation? Are they stuck on the wool insulation, are they rolled in situ and then cover the insulation or they are ready made in the market?
    • The insulation of the vessels you use is a sandwich construction with galvanized steel outside and 2” isocyanurate insulation. How do you roll the plates without cracking? Are the plates readymade in the market? How do you avoid thermal bridges on the door?
    • When the level of the solar collectors is higher than 10 meters that is the height of 1 bar will the siphonage be accomplished?
    • Our collectors have headers 20,5 mm and risers 8,5 mm internal diameter. Will they drain or capillary forces may catch water?
    • In your blogs you say that the pipe slope must be 1” per ft. Is it enough?
    Thank you very much for your valuable assistance.
    C. Oikonomidis
    Civil Engineer

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