Component failures and system performance degradation in SHW systems due to scaling are common in areas with hard water. It appears that many valve and pump failures on the potable water side are related to scaling, and any scale build-up on heat transfer surfaces will result in performance degradation. Different designs are compared in regard to their susceptibility to problematic scaling. Indirect systems utilizing external and tank wall heat exchangers are compared in regard to the rate of scaling and the consequences of scaling on system performance. The tank wall heat exchanger appears preferable over a doubly pumped external heat exchanger, both in terms of system reliability and resistance to performance degradation.
Designing Solar Hot Water Systems for Scaling Environments
Contributed by the Solar Energy Division of The American Society of Mechanical Engineers for publication in the ASME JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received by the ASME Solar Energy Division, Nov. 2000; final revision, Dec. 2000. Associate Editor: J. Davidson.
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Baker , D., and Vliet, G. (December 1, 2000). "Designing Solar Hot Water Systems for Scaling Environments ." ASME. J. Sol. Energy Eng. February 2001; 123(1): 43–47. https://doi.org/10.1115/1.1350564
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