EFFECT OF AIRFLOW AND HEAT INPUT RATES ON DUCT EFFICIENCY.

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Description

Reducing the airflow and heat input rates of a furnace that is connected to a duct system in thermal contact with unconditioned spaces can significantly reduce thermal distribution efficiency. This is a straightforward theoretical calculation based on the increased residence time of the air in the duct at the lower flow rate, which results in greater conduction losses. Experimental tests in an instrumented residential-size duct system have confirmed this prediction. Results are compared with the heat-loss algorithm in ASHRAE Standid 152P. The paper concludes with a discussion of possible remedies for this loss of efficiency in existing systems and optional ... continued below

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17 pages

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ANDREWS,J.W. May 28, 2003.

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Description

Reducing the airflow and heat input rates of a furnace that is connected to a duct system in thermal contact with unconditioned spaces can significantly reduce thermal distribution efficiency. This is a straightforward theoretical calculation based on the increased residence time of the air in the duct at the lower flow rate, which results in greater conduction losses. Experimental tests in an instrumented residential-size duct system have confirmed this prediction. Results are compared with the heat-loss algorithm in ASHRAE Standid 152P. The paper concludes with a discussion of possible remedies for this loss of efficiency in existing systems and optional design strategies in new construction.

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17 pages

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  • Other Information: PBD: 28 May 2003

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  • Report No.: BNL--71330-2003-IR
  • Grant Number: AC02-98CH10886
  • DOI: 10.2172/812518 | External Link
  • Office of Scientific & Technical Information Report Number: 812518
  • Archival Resource Key: ark:/67531/metadc734261

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  • May 28, 2003

Added to The UNT Digital Library

  • Oct. 18, 2015, 6:40 p.m.

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  • Nov. 7, 2016, 3:44 p.m.

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ANDREWS,J.W. EFFECT OF AIRFLOW AND HEAT INPUT RATES ON DUCT EFFICIENCY., report, May 28, 2003; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc734261/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.