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Life cycle assessment of two biologically produced phase change materials and their related products

  • LCA FOR ENERGY SYSTEMS AND FOOD PRODUCTS
  • Published:
The International Journal of Life Cycle Assessment Aims and scope Submit manuscript

Abstract

Purpose

Phase change materials (PCMs) hold considerable promise for thermal energy storage and reduction of temperature swings in building space, and can reduce reliance on fossil fuel sources for both heating and cooling. Previous studies have evaluated the use of PCMs for energy storage and provided some limited information on the embodied energy of the PCM; however, an important factor that has not fully been addressed until now is the environmental impact of preparation of organic PCMs. This study presents life cycle assessments (LCAs) of two organic, biosourced PCMs for their applications, focusing on embodied energy and CO2 emissions.

Methods

Dodecanoic acid produced from palm kernel oil was considered as a PCM for use in a solar thermal water heating application, and ethyl hexadecanoate produced from algae was considered for thermal buffering. The functional units were defined as 1 t of dodecanoic acid PCM and 1 kg of encapsulated ethyl hexadecanoate PCM, respectively. The LCA encompasses all phases in the PCM production: growth and harvesting of the feedstocks, extraction of the oil, treatment of the oil, and separation of singular components. The two PCMs were evaluated in terms of the payback times for their embodied energies and embodied CO2 under a modeled use phase.

Results and discussion

The energy payback time for dodecanoic acid in a solar thermal application was found to be less than 2 years. Although production of dodecanoic acid is a net CO2 emitter, use of this PCM in a solar thermal system can recoup the CO2 of production in less than a year. Ethyl hexadecanoate produced from algae, considered for use in a thermal buffering wallboard product, would require at least 30 years of use before its energy savings would match its embodied energy, mostly due to the drying step in the production of the PCM. However, ethyl hexadecanoate is a strong sequester of CO2 at 7.6 t per ton of ethyl hexadecanoate.

Conclusions

Dodecanoic acid produced from palm kernel oil for use in a solar thermal hot water system appears to be a viable PCM. Its payback time, both for energy and carbon emissions, is under 3 years. On the other hand, the high embodied energy of ethyl hexadecanoate produced from algae gives a prohibitively long payback time for use in domestic thermal buffering applications.

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Acknowledgments

The authors acknowledge support of this work from grants from NSERC (Canada), including scholarships to J.A.N. and P.M.A. from the NSERC CREATE Dalhousie Research in Energy, Advanced Materials and Sustainability (DREAMS) program. J.A.N. also acknowledges an NSERC PGS-M scholarship. We thank Professors Mark Obrovac and Dominic Groulx and Dr. Samer Kahwaji for useful comments.

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Authors and Affiliations

  1. Department of Chemistry and Institute for Research in Materials, Dalhousie University, Halifax, Nova Scotia, B3H 4R2, Canada

    John A. Noël, Paul M. Allred & Mary Anne White

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  1. John A. Noël
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  2. Paul M. Allred
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  3. Mary Anne White
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Correspondence to Mary Anne White.

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Responsible editor: Adisa Azapagic

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Noël, J.A., Allred, P.M. & White, M.A. Life cycle assessment of two biologically produced phase change materials and their related products. Int J Life Cycle Assess 20, 367–376 (2015). https://doi.org/10.1007/s11367-014-0831-1

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  • DOI: https://doi.org/10.1007/s11367-014-0831-1

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