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2. IEAS/SHC Task 49 “Solar Heat Integration in Industrial Process” . http://task49.iea-shc.org/(2012-2016).
3. Frank, E.; Hess, S.; Zahler, C.,: General requirements and relevant parameters for process heat collectors and specific collector loop components. IEA/SHC Task 49 Technical report (2012).
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5. ISO 9806:2013. Solar energy -- Solar thermal collectors -- Test methods. (http://www.iso.org/iso/home.htm).