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Improvement of Thermal Comfort and Efficient Energy Use in Buildings Based on Active-passive Systems for Overheating Reduction

其他書名	Doctoral Dissertation
出版	E. Zavrl, 2023
URL	http://books.google.com.hk/books?id=P_xv0AEACAAJ&hl=&source=gbs_api

註釋As a consequence of global warming, the enery demand for cooling is increasing. A novel active-passive system (APS) with phase change material (PCM) integrated into the substructure of the internal walls and ceiling for cooling is introduced. To ensure sufficient cooling effect of the system during the daytime cycle, the system must solidify completely during the nighttime cycle. To improve the heat transfer of the PCM, a ventilated air gap was placed behind PCM wall and ceiling substructure for free cooling. APS was investigated and designed based on literature review, unstacionary full-scale numerical simulation (building level), experimental investigation, parametric study performed with micro-scale numerical model in CFD and calculation of energy performance and operation cost. First type of scenarios experimentally tested the cooling effect of the PCM during the daytime cycle, determined by the temperature difference between the cell-without and cellPCM. Second type of scenarios experimentally and numerically tested the PCM solidification time during the nighttime cycle. APS decreased the indoor temperatures for by 4.5 °C. The results showed that with the current configuration, the PCM can be sufficiently solidified at inlet temperature of 17 °C. APS system has lower operating costs than G class AC device.