不管我们住在哪里,温室气体排放问题影响到我们所有人。他们的影响对地球的气候有灾难性的影响,造成全球变暖和许多其他不可逆转的环境影响,即使它偶尔是看不见的独立的眼睛。相变材料(PCM)可以在白天丰富时存储和释放热量(例如,来自太阳辐射),晚上使用,或者在寒冷的日子里,建筑物需要加热。因此,建筑物使用更少的能源来加热和冷却,从而降低温室气体排放。因此,这项工作介绍了具有PCM的热活性中密度纤维板(MDF)的研究。MDF适用于室内设计和家具制造。木板是使用松树(PinussylvestrisL.)和云杉(PiceaabiesL.)纤维制成的,脲醛树脂,和PCM粉末,相变温度为22°C,密度为785kgm-3,潜热容量为160kJkg-1,体积热容量为126MJm-3,比热容量为2.2kJkgK-1,导热系数为0.18WmK-1,最高工作温度为200°C。在恢复之前,将木纤维分成两个外层(16%)和一个内层(68重量%)。在整个树脂化过程中,将PCM颗粒单独整合到内层纤维中。垫子是手工制作的。一台液压机(AKE,Mariannelund,瑞典)被用来压板,其操作参数为180°C,20s/mm的标称厚度,最大单位压制压力为2.5MPa。开发了具有PCM添加剂的MDF的五种变体:0%,5%,10%,30%,和50%。根据研究,MOR的分数,MOE,IB,当添加PCM含量时,螺钉拔出阻力(SWR)测试降低,例如,MOE为3176至1057Nmm-2,MOR为41.2至11.5Nmm-2,IB为0.78至0.27Nmm-2。然而,厚度溶胀和吸水率测试的结果表明,PCM颗粒没有表现出明显的吸水能力,保持MDF板的尺寸稳定性。浸泡24h后,随着PCM含量从15.1增加到7.38%,厚度溶胀呈正下降。面板的热特性随着PCM浓度的增加而改善,根据数据。所考虑的所有变化的密度分布都具有一定的U形外观;但是,具有50%PCM含量的版本具有更平坦的形式并且在面板表面上没有明显的层压实。因此,制造的面板的某些机械和物理特性可以通过精心选择的PCM添加来增强。
No matter where we reside, the issue of greenhouse gas emissions impacts us all. Their influence has a disastrous effect on the earth\'s climate, producing global warming and many other irreversible environmental impacts, even though it is occasionally invisible to the independent eye. Phase change materials (PCMs) can store and release heat when it is abundant during the day (e.g., from solar radiation), for use at night, or on chilly days when buildings need to be heated. As a consequence, buildings use less energy to heat and cool, which lowers greenhouse gas emissions. Consequently, research on thermally active medium-density fiberboard (MDF) with PCMs is presented in this work. MDF is useful for interior design and furniture manufacturing. The boards were created using pine (Pinus sylvestris L.) and spruce (Picea abies L.) fibers, urea-formaldehyde resin, and PCM powder, with a phase transition temperature of 22 °C, a density of 785 kg m-3, a latent heat capacity of 160 kJ kg-1, a volumetric heat capacity of 126 MJ m-3, a specific heat capacity of 2.2 kJ kgK-1, a thermal conductivity of 0.18 W mK-1, and a maximum operating temperature of 200 °C. Before resination, the wood fibers were divided into two outer layers (16%) and an interior layer (68% by weight). Throughout the resination process, the PCM particles were solely integrated into the inner layer fibers. The mats were created by hand. A hydraulic press (AKE, Mariannelund, Sweden) was used to press the boards, and its operating parameters were 180 °C, 20 s/mm of nominal thickness, and 2.5 MPa for the maximum unit pressing pressure. Five variants of MDF with a PCM additive were developed: 0%, 5%, 10%, 30%, and 50%. According to the study, scores at the MOR, MOE, IB, and screw withdrawal resistance (SWR) tests decreased when PCM content was added, for example, MOE from 3176 to 1057 N mm-2, MOR from 41.2 to 11.5 N mm-2, and IB from 0.78 to 0.27 N mm-2. However, the results of the thickness swelling and water absorption tests indicate that the PCM particles do not exhibit a substantial capacity to absorb water, retaining the dimensional stability of the MDF boards. The thickness swelling positively decreased with the PCM content increase from 15.1 to 7.38% after 24 h of soaking. The panel\'s thermal characteristics improved with the increasing PCM concentration, according to the data. The density profiles of all the variations under consideration had a somewhat U-shaped appearance; however, the version with a 50% PCM content had a flatter form and no obvious layer compaction on the panel surface. Therefore, certain mechanical and physical characteristics of the manufactured panels can be enhanced by a well-chosen PCM addition.