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Title: Measure Guideline: Optimizing the Configuration of Flexible Duct Junction Boxes

Abstract

This measure guideline offers additional recommendations to heating, ventilation, and air conditioning (HVAC) system designers for optimizing flexible duct, constant-volume HVAC systems using junction boxes within Air Conditioning Contractors of America (ACCA) Manual D guidance. IBACOS used computational fluid dynamics software to explore and develop guidance to better control the airflow effects of factors that may impact pressure losses within junction boxes among various design configurations. These recommendations can help to ensure that a system aligns more closely with the design and the occupants' comfort expectations. Specifically, the recommendations described herein show how to configure a rectangular box with four outlets, a triangular box with three outlets, metal wyes with two outlets, and multiple configurations for more than four outlets. Designers of HVAC systems, contractors who are fabricating junction boxes on site, and anyone using the ACCA Manual D process for sizing duct runs will find this measure guideline invaluable for more accurately minimizing pressure losses when using junction boxes with flexible ducts.

Authors:
 [1];  [1]
  1. IBACOS, Inc., Pittsburgh, PA (United States)
Publication Date:
Research Org.:
IBACOS, Inc., Pittsburgh, PA (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office
OSTI Identifier:
1221060
Report Number(s):
DOE/GO-102014-4396
6769
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
residential; Residential Buildings; IBACOS; Building America; flexible ducts; junction boxes; duct sizing; pressure losses in HVAC systems; balancing dampers in HVAC systems; residential HVAC systems; friction rate; equivalent length (ducts); static pressure; available pressure

Citation Formats

Beach, R., and Burdick, A. Measure Guideline: Optimizing the Configuration of Flexible Duct Junction Boxes. United States: N. p., 2014. Web. doi:10.2172/1221060.
Beach, R., & Burdick, A. Measure Guideline: Optimizing the Configuration of Flexible Duct Junction Boxes. United States. https://doi.org/10.2172/1221060
Beach, R., and Burdick, A. 2014. "Measure Guideline: Optimizing the Configuration of Flexible Duct Junction Boxes". United States. https://doi.org/10.2172/1221060. https://www.osti.gov/servlets/purl/1221060.
@article{osti_1221060,
title = {Measure Guideline: Optimizing the Configuration of Flexible Duct Junction Boxes},
author = {Beach, R. and Burdick, A.},
abstractNote = {This measure guideline offers additional recommendations to heating, ventilation, and air conditioning (HVAC) system designers for optimizing flexible duct, constant-volume HVAC systems using junction boxes within Air Conditioning Contractors of America (ACCA) Manual D guidance. IBACOS used computational fluid dynamics software to explore and develop guidance to better control the airflow effects of factors that may impact pressure losses within junction boxes among various design configurations. These recommendations can help to ensure that a system aligns more closely with the design and the occupants' comfort expectations. Specifically, the recommendations described herein show how to configure a rectangular box with four outlets, a triangular box with three outlets, metal wyes with two outlets, and multiple configurations for more than four outlets. Designers of HVAC systems, contractors who are fabricating junction boxes on site, and anyone using the ACCA Manual D process for sizing duct runs will find this measure guideline invaluable for more accurately minimizing pressure losses when using junction boxes with flexible ducts.},
doi = {10.2172/1221060},
url = {https://www.osti.gov/biblio/1221060}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Mar 01 00:00:00 EST 2014},
month = {Sat Mar 01 00:00:00 EST 2014}
}