Seasonal thermal performance analysis of glazed window filled with paraffin including various nanoparticles

Abstract

Summary A two‐dimensional heat transfer model was proposed to numerically investigate the effect of enriching phase change material (PCM) with different kinds of nanoparticles on thermal performance of glazing windows in different seasons of the year. The results were presented in terms of liquid fraction of PCM, inner surface temperature and temperature difference between interior and exterior surfaces of glass window, and their occurrence times. The results showed that adding nanoparticles into PCM can promote the melting and solidification processes, extend the total time of PCM being in the liquid state, and raise the internal surface temperature of glass. However, in summer season, the internal surface temperature decreases and the total melting time respectively reduces by 7 and 1.5 minutes by introducing TiO2 and ZnO nanoparticles into PCM. Furthermore, the introduced nanoparticles do not have the same effect on the thermal performance of the window unit. While the inner surface temperature decreases by 0.82 K in summer by addition of TiO2 to PCM, it increases by 0.84 K in transition season and 0.89 K in winter season by utilizing ZnO nanoparticles. Although the nano‐PCM remains in the solid state in winter, the existence of nanoparticles can still increase the inner surface temperature.

Review on phase change materials and application in building energy saving

“…It shows that phase change temperatures of paraffin waxes, water, and mixtures of water and salt are matched to the temperature range for building energy efficiency so that they are utilized as the most common types of PCMs. Different types of PCMs have different advantages [3][4][5][6].…”

Single and Hybrid Nanofluids to Enhance Performance of Flat Plate Solar Collectors: Application and Obstacles

“…NFs have proved an essential enhancement in the heat transfer of many thermal applications and showed excellent results in solar collector applications [15][16][17]. The most commonly used conventional fluids as a base fluid in NFs are dispersed water, ethylene glycol, a mixture of water and ethylene glycol and, engine oil and paraffin [18][19][20][21]. The types of NPs used to prepare NFs can be made from different materials, as listed in Table 1 [22].…”

Applying artificial neural networks to predict the enhanced thermal conductivity of a phase change material with dispersed oxide nanoparticles

“…13 Many researchers have extensively investigated enhanced TC of PCMs containing various nanostructured materials such as metallic nanoparticles, 14,15 carbon-based nanomaterials, [16][17][18] and oxide nanoparticles. [19][20][21] Table 1 demonstrates the list of some recent studies [22][23][24][25][26][27][28][29][30][31][32][33] on enhanced TC of PCMs with dispersed oxide nanoparticles and reports the TC enhancement for all nanoparticle loadings and temperatures. As shown in Table 1, some discrepancies can be found between various references due to materials, preparation methods, and measurement techniques.…”