Designing Solar Hot Water Systems for Scaling Environments

Research output: Contribution to conferencePaper


Component failures and system performance degradation in solar hot water (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 toproblematic scaling. Indirect systems utilizing external and wrap-around heat exchangers are compared in regard to the rate of scaling and the consequences of scaling on system performance. The wrap-around heat exchanger appears preferable over a doubly pumped external heat exchanger, both in terms of system reliability and resistance to performance degradation.
Original languageAmerican English
Number of pages6
StatePublished - 1998
Event1998 American Solar Energy Society Annual Conference - Albuquerque, New Mexico
Duration: 14 Jun 199817 Jun 1998


Conference1998 American Solar Energy Society Annual Conference
CityAlbuquerque, New Mexico

Bibliographical note

Work performed by University of Texas, Austin, Texas

NREL Publication Number

  • NREL/CP-550-25577


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