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Mathematical evaluation of a buried phase change concrete cooling system for buildings

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  • Darkwa, Jo

Abstract

A laminated phase change concrete duct system has been numerically analysed for cooling applications in buildings. The analysis shows that number of transfer units (NTUs) have considerable effect on the thermal performance of the system. For instance the highest factor of phase change material (PCM) melting thickness and surface temperature fraction were achieved with the lowest NTU value of 0.1. In terms of cooling effects, the two scenarios achieved maximum cooling capacities of 12.5Â kW and 25Â kW respectively. However in order to achieve effective thermal response in a mechanically ventilated ductwork system, some form of turbulent flow through surface roughness and configuration would have to be created. Even though the model was developed based on the assumption that the PCM is pure and may melt at a specific temperature the results appear to be a fair representation of what might happen in practise. Experimental validation is however recommended towards commercial and economic evaluation.

Suggested Citation

  • Darkwa, Jo, 2009. "Mathematical evaluation of a buried phase change concrete cooling system for buildings," Applied Energy, Elsevier, vol. 86(5), pages 706-711, May.
    • Handle: RePEc:eee:appene:v:86:y:2009:i:5:p:706-711
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    Cited by:

    1. Darkwa, J. & Su, O. & Zhou, T., 2012. "Development of non-deform micro-encapsulated phase change energy storage tablets," Applied Energy, Elsevier, vol. 98(C), pages 441-447.
    2. Ling, Haoshu & Chen, Chao & Wei, Shen & Guan, Yong & Ma, Caiwen & Xie, Guangya & Li, Na & Chen, Ziguang, 2015. "Effect of phase change materials on indoor thermal environment under different weather conditions and over a long time," Applied Energy, Elsevier, vol. 140(C), pages 329-337.
    3. Joulin, Annabelle & Younsi, Zohir & Zalewski, Laurent & Lassue, Stéphane & Rousse, Daniel R. & Cavrot, Jean-Paul, 2011. "Experimental and numerical investigation of a phase change material: Thermal-energy storage and release," Applied Energy, Elsevier, vol. 88(7), pages 2454-2462, July.
    4. Parameshwaran, R. & Kalaiselvam, S. & Harikrishnan, S. & Elayaperumal, A., 2012. "Sustainable thermal energy storage technologies for buildings: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(5), pages 2394-2433.
    5. Alizadeh, M. & Sadrameli, S.M., 2016. "Development of free cooling based ventilation technology for buildings: Thermal energy storage (TES) unit, performance enhancement techniques and design considerations – A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 58(C), pages 619-645.
    6. 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.

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