Hot Water Distribution System Model Enhancements

Research output: NRELSubcontract Report


This project involves enhancement of the HWSIM distribution system model to more accurately model pipe heat transfer. Recent laboratory testing efforts have indicated that the modeling of radiant heat transfer effects is needed to accurately characterize piping heat loss. An analytical methodology for integrating radiant heat transfer was implemented with HWSIM. Laboratory test data collected inanother project was then used to validate the model for a variety of uninsulated and insulated pipe cases (copper, PEX, and CPVC). Results appear favorable, with typical deviations from lab results less than 8%.
Original languageAmerican English
Number of pages20
StatePublished - 2012

Bibliographical note

Work performed by Alliance for Residential Building Innovation (ARBI), Davis, California

NREL Publication Number

  • NREL/SR-5500-55203

Other Report Number

  • DOE/GO-102012-3626


  • Alliance for Residential Building Innovation
  • arbi
  • Building America
  • heat transfer modeling
  • hot water distribution systems
  • residential
  • residential buildings
  • simulation models
  • validation


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