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2013 Title 24 Res ACM - DHW. Heschong Mahone Group, Inc. Energy Solutions Nov 20, 2012. MF DHW ACM – 2013 Update. Standard Design Updated – Prescriptive Requirement Distribution: two-loop recirculation with demand control Solar water heating: SF by CZ

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2013 title 24 res acm dhw

2013 Title 24 Res ACM - DHW

Heschong Mahone Group, Inc.

Energy Solutions

Nov 20, 2012

mf dhw acm 2013 update
MF DHW ACM – 2013 Update
  • Standard Design Updated – Prescriptive Requirement
    • Distribution: two-loop recirculation with demand control
    • Solar water heating: SF by CZ
  • Four Components of Hourly Adjusted Recovery Load (HARL)
    • Hourly end use adjusted by in-unit distribution loss
      • HW supply Temp: 135F to 130 F
    • Solar WH – offset hourly end use (not distribution loss)
    • Central recirculation system heat loss
      • Performance of controls
      • Recirculation plumbing designs
      • Branch pipe performance
    • Storage tank surface heat loss – no change
mf dhw acm standard recirc design
MF DHW ACM – Standard Recirc. Design
  • Pipe Heat Loss Model Adapted from PIER Study Results
    • Model validated by field monitoring results
    • Plumbing designs based on field survey (>30 buildings)
  • Standard Design
    • Streamlined piping design base on:
      • # of unit, story, and floor area
    • Two-loop design
      • Smaller pipe size
mf dhw acm proposed design
MF DHW ACM – Proposed Design
  • Use default or User-input Design
    • Recirculation loop represented by 6 pipe sections
  • Default Design
    • Less optimized design than the standard design
      • Slightly longer pipe than the standard design
      • Better than most designs observed in the field
    • One-loop design: Pipe size larger than standard design
  • User-input Design – Pipe surface area validated/adjusted
    • HERS verified dual-loop design – validated by standard design
    • All Others - validated by the default design
mf dhw acm branch pipe
MF DHW ACM – Branch Pipe
  • Branch pipe
    • Between recirc. loops and pipes within units
  • Standard Design Same as Default Design
    • Number of branch  number of unit /floor
    • Pipe length  number of floors
    • Pipe diameter  number of unit served
  • Performance Calculation
    • Pipe heat loss during usage
    • Water/energy for waiting hot water