Screening and Degradation Tests of Linear-Polymer Additives for District Heating Applications

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Description

In closed-loop district heating and cooling (DHC) systems, the addition of a friction-reducing additive to the working fluid conveying energy between the energy sources and end users would allow increased load-handling capability (in an existing system) or the use of much smaller pipes and/or pumps (in a new system). As the first step in identifying friction-reducing additives that have a reasonable lifetime at DHC temperatures, two high-molecular-weight linear-polymer additives have been tested at two different temperatures (25.0 C and 87.8 C). The additives are Polyox WSR-301 and Separan AP-273 at 200 wppm in deionized water. Results of capillary tube screening … continued below

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vi, 41 p. : charts

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Choi, U. S.; Cho, Young I. & Kasza, Kenneth Edmund December 1987.

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  • Main Title: Screening and Degradation Tests of Linear-Polymer Additives for District Heating Applications
  • Added Title: ANL (Series)
  • Added Title: Argonne National Laboratory Report ANL-87-49
  • Series Title: Argonne National Laboratory Reports

Description

In closed-loop district heating and cooling (DHC) systems, the addition of a friction-reducing additive to the working fluid conveying energy between the energy sources and end users would allow increased load-handling capability (in an existing system) or the use of much smaller pipes and/or pumps (in a new system). As the first step in identifying friction-reducing additives that have a reasonable lifetime at DHC temperatures, two high-molecular-weight linear-polymer additives have been tested at two different temperatures (25.0 C and 87.8 C). The additives are Polyox WSR-301 and Separan AP-273 at 200 wppm in deionized water. Results of capillary tube screening tests with fresh solutions show that both polymers can give more than 60% friction reduction. However, Separan is effective at high temperatures, whereas Polyox undergoes thermal degradation. Degradation tests in a closed recirculatory flow system show that (1) friction reduction is always accompanied by heat transfer reduction regardless of the hours of shear, (2) Polyox cannot be used in recirculatory systems because it is very sensitive to mechanical degradation, and (3) although Separan does degrade under high flow shear conditions, it does not degrade completely; it achieves a plateau value of friction reduction even under continuous shear. This is an important discovery and implies that Separan is still a good candidate for closed-loop DH systems.

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vi, 41 p. : charts

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  • OCLC: 879335494
  • SuDoc Number: Y 3.AT 7:22/ANL-87-49
  • Report No.: ANL-87-49
  • Grant Number: W-31-109-Eng-38
  • Archival Resource Key: ark:/67531/metadc282848

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  • December 1987

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  • Aug. 4, 2015, 8:33 a.m.

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Thumbnail image of item number 1 in: 'Screening and Degradation Tests of Linear-Polymer Additives for District Heating Applications'.
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Thumbnail image of item number 3 in: 'Screening and Degradation Tests of Linear-Polymer Additives for District Heating Applications'.
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Choi, U. S.; Cho, Young I. & Kasza, Kenneth Edmund. Screening and Degradation Tests of Linear-Polymer Additives for District Heating Applications, report, December 1987; Argonne, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc282848/: accessed June 11, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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