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Techno-Economic Assessment of an Air-Multiple PCM Active Storage Unit for Free Cooling Application

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  • Muriel Iten

    (Low Carbon and Resource Efficiency, R&Di, Instituto de Soldadura e Qualidade, 4415491 Grijó, Portugal)

Abstract

A latent energy storage (LES) unit is presented in this paper for free space cooling and ventilation application. The unit includes multiple phase change materials (PCM) to advance the thermal performance of common LES units. It is composed by metallic rectangular panels containing commercial paraffins with melting temperatures ranging among 20 °C and 25 °C and surrounded by air channels. The average cooling load of the unit corresponds to approximately 1 kW over 8 h. It fulfils the peak ventilation cooling load during summer of an office building in Portugal. The study provides a techno-economic analysis and the environmental benefits of the LES technology compared to a traditional air conditioning (AC) unit for the cooling and ventilation of an office building. During daytime, the air-multiple PCM unit allows reducing the energy consumption by nearly 200 kWh. The full charging of the PMs during nighttime, requires significant energy consumption due to the high air flowrate demand for full solidification. The competitiveness of such units can be achieved by introducing fins into the panels, allowing double the energy savings. In an overall perspective, the unit presents several benefits such as lower initial cost and reduced maintenance requirements (non-use of refrigerants and batteries) that also allows better personal health issues when related to traditional ACs.

Suggested Citation

  • Muriel Iten, 2021. "Techno-Economic Assessment of an Air-Multiple PCM Active Storage Unit for Free Cooling Application," Sustainability, MDPI, vol. 13(23), pages 1-10, November.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:23:p:12936-:d:685480
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    References listed on IDEAS

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    1. Iten, Muriel & Liu, Shuli & Shukla, Ashish, 2018. "Experimental validation of an air-PCM storage unit comparing the effective heat capacity and enthalpy methods through CFD simulations," Energy, Elsevier, vol. 155(C), pages 495-503.
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