[New Article] Thermal performance of a dynamic insulation-PCM system in multilayer hollow walls

In China 🇨🇳, most buildings are not insulated, and it seems they won't be insulated soon. 🉐 China does not 👮impose an environmental taxation system on⛽ fossil fuels, and as a consequence, architects and building engineers mainly focus on the energy efficiency of HVAC systems and not the envelope in the 🏗 built environment. Therefore, 🎚dynamic insulation materials can play a role in reducing energy use intensity GHG emissions and improving 💧🩸thermal comfort. Dynamic insulation systems (DIS), based on airflow, are introduced into PCM to form a composite structure and can create a switchable thermal resistance to address this issue.

This paper addresses overheating and energy use issues by introducing a DIS-PCM system to the multilayer hollow wall component in a well-insulated building. It is identified that the multilayer hollow wall system has practicable air space for simultaneously loading DIS and PCM. Whereas PCM has the ability to store extensive thermal energy at almost constant temperatures, and DIS can promote energy storage of PCM via rational modification of thermal resistance.

The result indicates that thermal resistance can be modified by natural convection and 🎱 forced turbulence of air. Forced turbulence case obtains the lowest thermal resistance, orderly followed by natural convection and closed cases. Indoor thermal comfortable temperature can be accurately adjusted according to the air-flowing rate. In conclusion, the novel DIS-PCM system eliminates 🏜️ building overheating issues through its thermal resistance switch in response to various working scenarios, with substantial benefits to the development of latent heat thermal energy storage available for building energy conservation.

📝 Citation: Zhang, Z., Zhang, N., Yuan, Y., Phelan, P. E., & Attia, S. (2023). Thermal performance of a dynamic insulation-phase change material system and its application in multilayer hollow walls. Journal of Energy Storage, 62, 106912.

📢 Read and share the 📄 article. The paper is available in Open Access format: https://lnkd.in/etgbsZQv

This study was conducted under the leadership of Prof. Yanping Yuan, Dr. Zhaoli Zhang and Dr. Nan in collaboration with Pat Phelan and Shady Attia. Thank Zhaoli Zhan, for leading this 🤲collaboration initiative.

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#Dynamicinsulationsystem; #Thermalresistance; #PCM; #adaptivefacade; #Heatdissipationrate; #overheating