Prediction of polymer tube life for solar hot water systems: A model of antioxidant loss

Gur Mittelman; Jane H Davidson; Susan C Mantell; Yan Su

doi:10.1016/j.solener.2007.10.002

Prediction of polymer tube life for solar hot water systems: A model of antioxidant loss

Gur Mittelman
, Jane H Davidson
, Susan C Mantell
, Yan Su

Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

25 Scopus citations

Abstract

The successful use of polymer components in solar hot water systems requires an understanding and method of predicting material degradation in water. The relevant degradation mechanism is oxidation. Degradation from oxidation can be delayed through the use of antioxidant additives. However, once the antioxidants have been depleted, oxidation of the polymer and subsequent loss of mechanical integrity occur rapidly. In this study, antioxidant loss from polymer tubes is modeled. Dimensional analysis and results of the model show the rate of antioxidant loss is controlled by diffusion through the polymer. The diffusion time scale is dictated by the tube wall thickness. Antioxidant concentration profiles and depletion rates are presented for three representative tube geometries and temperatures of 293 and 333 K. The time to deplete 90% of the antioxidant is on the order of 1000-10,000 h.

Original language	English (US)
Pages (from-to)	452-461
Number of pages	10
Journal	Solar Energy
Volume	82
Issue number	5
DOIs	https://doi.org/10.1016/j.solener.2007.10.002
State	Published - May 2008

Bibliographical note

Funding Information:
The authors gratefully acknowledge the financial support of the National Renewable Energy Laboratory, the US Department of Energy, the University of Minnesota Initiative for Renewable Energy and the Environment and the University of Minnesota Supercomputing Institute.

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

Antioxidant
Diffusion
Polymer
Solar
Water

Publisher link

10.1016/j.solener.2007.10.002

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title = "Prediction of polymer tube life for solar hot water systems: A model of antioxidant loss",

abstract = "The successful use of polymer components in solar hot water systems requires an understanding and method of predicting material degradation in water. The relevant degradation mechanism is oxidation. Degradation from oxidation can be delayed through the use of antioxidant additives. However, once the antioxidants have been depleted, oxidation of the polymer and subsequent loss of mechanical integrity occur rapidly. In this study, antioxidant loss from polymer tubes is modeled. Dimensional analysis and results of the model show the rate of antioxidant loss is controlled by diffusion through the polymer. The diffusion time scale is dictated by the tube wall thickness. Antioxidant concentration profiles and depletion rates are presented for three representative tube geometries and temperatures of 293 and 333 K. The time to deplete 90\% of the antioxidant is on the order of 1000-10,000 h.",

keywords = "Antioxidant, Diffusion, Polymer, Solar, Water",

author = "Gur Mittelman and Davidson, \{Jane H\} and Mantell, \{Susan C\} and Yan Su",

note = "Funding Information: The authors gratefully acknowledge the financial support of the National Renewable Energy Laboratory, the US Department of Energy, the University of Minnesota Initiative for Renewable Energy and the Environment and the University of Minnesota Supercomputing Institute.",

year = "2008",

month = may,

doi = "10.1016/j.solener.2007.10.002",

language = "English (US)",

volume = "82",

pages = "452--461",

journal = "Solar Energy",

issn = "0038-092X",

publisher = "Elsevier Ltd",

number = "5",

}

TY - JOUR

T1 - Prediction of polymer tube life for solar hot water systems

T2 - A model of antioxidant loss

AU - Mittelman, Gur

AU - Davidson, Jane H

AU - Mantell, Susan C

AU - Su, Yan

N1 - Funding Information: The authors gratefully acknowledge the financial support of the National Renewable Energy Laboratory, the US Department of Energy, the University of Minnesota Initiative for Renewable Energy and the Environment and the University of Minnesota Supercomputing Institute.

PY - 2008/5

Y1 - 2008/5

N2 - The successful use of polymer components in solar hot water systems requires an understanding and method of predicting material degradation in water. The relevant degradation mechanism is oxidation. Degradation from oxidation can be delayed through the use of antioxidant additives. However, once the antioxidants have been depleted, oxidation of the polymer and subsequent loss of mechanical integrity occur rapidly. In this study, antioxidant loss from polymer tubes is modeled. Dimensional analysis and results of the model show the rate of antioxidant loss is controlled by diffusion through the polymer. The diffusion time scale is dictated by the tube wall thickness. Antioxidant concentration profiles and depletion rates are presented for three representative tube geometries and temperatures of 293 and 333 K. The time to deplete 90% of the antioxidant is on the order of 1000-10,000 h.

AB - The successful use of polymer components in solar hot water systems requires an understanding and method of predicting material degradation in water. The relevant degradation mechanism is oxidation. Degradation from oxidation can be delayed through the use of antioxidant additives. However, once the antioxidants have been depleted, oxidation of the polymer and subsequent loss of mechanical integrity occur rapidly. In this study, antioxidant loss from polymer tubes is modeled. Dimensional analysis and results of the model show the rate of antioxidant loss is controlled by diffusion through the polymer. The diffusion time scale is dictated by the tube wall thickness. Antioxidant concentration profiles and depletion rates are presented for three representative tube geometries and temperatures of 293 and 333 K. The time to deplete 90% of the antioxidant is on the order of 1000-10,000 h.

KW - Antioxidant

KW - Diffusion

KW - Polymer

KW - Solar

KW - Water

UR - https://www.scopus.com/pages/publications/41949121550

UR - https://www.scopus.com/pages/publications/41949121550#tab=citedBy

U2 - 10.1016/j.solener.2007.10.002

DO - 10.1016/j.solener.2007.10.002

M3 - Article

AN - SCOPUS:41949121550

SN - 0038-092X

VL - 82

SP - 452

EP - 461

JO - Solar Energy

JF - Solar Energy

IS - 5

ER -

Prediction of polymer tube life for solar hot water systems: A model of antioxidant loss

Abstract

Bibliographical note

UN SDGs

Keywords

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