Abstract
PCMs (Phase Change Materials) can be integrated into building envelopes to decrease the building energy consumption, refine the indoor thermal comfort, shift and reduce the peak electricity load due to its relatively large latent heat. In this study, influence of the PCM layer location on the multilayer wall thermal performance is numerically researched in four walls under the climate conditions of Chengdu, China. The results only shows when the phase change of PCM occurs; its latent thermal storage performance can be played and have the significant influence on wall thermal performance. Due to phase change of PCM occurs, the fluctuation amplitudes of inner surface temperature and heat flow are reduced obviously; the temperature peak value is delayed in the phase-change occurred periods. In addition, the PCM layer can reduce inner surface heat flow, especially in summer and transition season, which is in the phase-change occurred periods. The average annual heat flow can be reduced by 8.5% - 11.8%. And when the PCM layer is closer to the wall internal side, the influence of the PCM layer location on the multilayer wall thermal performance is more significantly.
Highlights
With the development of society, demand in thermal comfort of buildings is rising increasingly; the energy consumption is correspondingly increasing. [1] [2]
The simulation has done for the heat transfer of walls integrated with the phase change material (PCM) layer, but inner surface transient temperature and heat flow are only showed in the periods of Aug. 1 - Aug. 7, which donates the summer condition, Apr. 1 - Apr. 7, which donates the transition season condition, and Jan. 1 - Jan. 7, which donates the winter condition
The covering rates of inner and outer surface temperatures are 98.4% and 97.3% for Wall 1 with the PCM layer located in the internal side, 98.4% and 97.3% for Wall 2 with the PCM layer located in the middle and 94.7% and 92.7% for Wall 3 with the PCM layer located in the external side, which shows the solidus and liquidus temperatures of PCM gained from Equations (2)-(3) can guarantee the PCM phase-change occurrence for the different locations of the PCM layer under the phase-change occurrence design period. 3.2
Summary
With the development of society, demand in thermal comfort of buildings is rising increasingly; the energy consumption is correspondingly increasing. [1] [2]. Increasing the filled amount of PCM could make the indoor wall surface temperature fluctuation be significantly smoothed. Most of studies have ignored the influence of phase-change temperature arrange of PCM. Only when the phase change of PCM occurs can the latent thermal storage performance be played, so the reasonable phasechange temperature arrange of PCM is the most important factor. Based on the above analysis, this paper builds four wall models, of which one is a reference subject and other three are the walls integrated with the PCM layer in the different location, and according to the previous studies [6] [7], the optimal phasechange temperature arranges of PCM are proposed for the multilayer walls. The influence of the PCM layer location is numerically simulated on the wall thermal performance which is based on the outer climate condition of Chengdu, China
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