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Determination of Optimum Hot-Water Temperatures for PCM Radiant Floor-Heating Systems Based on the Wet Construction Method

Author

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  • Sanghoon Baek

    (Industry Academic Cooperation Foundation, Hankyong National University, 327, Jungang-ro, Anseong-si, Gyeonggi-do 17579, Korea)

  • Sangchul Kim

    (School of Architecture, Hankyong National University, 327, Jungang-ro, Anseong-si, Gyeonggi-do 17579, Korea)

Abstract

Owing to use of mortar, which demonstrates low heat storage and discharge performance, conventional radiant floor-heating systems, based on the wet construction method and hot-water circulation, consume large amounts of energy. This study proposes a new type of radiant floor-heating system that is capable of reducing energy consumption via use of the latent heat of a phase change material (PCM), whereby the phase change, which occurs within, is induced by the thermal energy supplied by hot water. Simulation analyses revealed that hot-water supply temperatures, required to maintain the floor-surface and indoor-air temperatures at the set point using PCM latent heat, were in the range 40–41 °C. At supply water temperatures measuring less than 39 °C or exceeding 42 °C, the latent-heat effect of the phase change of the PCM tended to fail, and the corresponding floor-surface temperature assumed a value different from that corresponding to the set point. By contrast, supply temperatures in the range 40–41 °C resulted in return temperatures measuring approximately 27.4–27.5 °C, which in turn corresponded to an indoor air temperature of 21.6–22.6 °C that was stably maintained within ±0.6 °C of the 22 °C set-point temperature.

Suggested Citation

  • Sanghoon Baek & Sangchul Kim, 2018. "Determination of Optimum Hot-Water Temperatures for PCM Radiant Floor-Heating Systems Based on the Wet Construction Method," Sustainability, MDPI, vol. 10(11), pages 1-19, November.
    • Handle: RePEc:gam:jsusta:v:10:y:2018:i:11:p:4004-:d:179962
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    References listed on IDEAS

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    1. Cheng, Wenlong & Xie, Biao & Zhang, Rongming & Xu, Zhiming & Xia, Yuting, 2015. "Effect of thermal conductivities of shape stabilized PCM on under-floor heating system," Applied Energy, Elsevier, vol. 144(C), pages 10-18.
    2. Barzin, Reza & Chen, John J.J. & Young, Brent R. & Farid, Mohammed M., 2015. "Application of PCM underfloor heating in combination with PCM wallboards for space heating using price based control system," Applied Energy, Elsevier, vol. 148(C), pages 39-48.
    3. Zhou, Guobing & He, Jing, 2015. "Thermal performance of a radiant floor heating system with different heat storage materials and heating pipes," Applied Energy, Elsevier, vol. 138(C), pages 648-660.
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    Cited by:

    1. S. A. M. Mehryan & Kaamran Raahemifar & Leila Sasani Gargari & Ahmad Hajjar & Mohamad El Kadri & Obai Younis & Mohammad Ghalambaz, 2021. "Latent Heat Phase Change Heat Transfer of a Nanoliquid with Nano–Encapsulated Phase Change Materials in a Wavy-Wall Enclosure with an Active Rotating Cylinder," Sustainability, MDPI, vol. 13(5), pages 1-20, March.
    2. Sanghoon Baek & Sangchul Kim, 2019. "Analysis of Thermal Performance and Energy Saving Potential by PCM Radiant Floor Heating System based on Wet Construction Method and Hot Water," Energies, MDPI, vol. 12(5), pages 1-17, March.
    3. Yudi Wang & Guoqiang Xu, 2022. "Numerical Simulation of Thermal Storage Performance of Different Concrete Floors," Sustainability, MDPI, vol. 14(19), pages 1-19, October.
    4. Sanghoon Baek & Sangchul Kim, 2019. "Optimum Design and Energy Performance of Hybrid Triple Glazing System with Vacuum and Carbon Dioxide Filled Gap," Sustainability, MDPI, vol. 11(19), pages 1-17, October.

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