太阳能复合相变蓄能炕的设计及热性能研究

Design and Thermal Performance Research of Solar Energy Composite Phase Change Energy Storage Kang

为解决我国北方农村冬季采暖过程中能源浪费及环境污染的问题,设计了一种以太阳能为热源,石蜡为相变蓄能材料的蜂窝活性炭-石蜡复合相变蓄能炕采暖系统。在供水温度为40℃的条件下,通过对比试验,分析了纯石蜡蓄能炕、蜂窝活性炭孔密度分别为20,30以及40 PPI的复合蓄能炕的热性能。实验结果表明:新型蓄能炕可以满足人体对于夜间睡眠的热舒适性需求。蜂窝活性炭孔密度为20 PPI的复合蓄能炕升温及降温速度最快,分别为0.35和0.39℃;炕面层温度标准差最低,为0.39℃,比30 PPI的低18.75%,比40 PPI的低23.53%,比纯石蜡的低41.79%;睡眠层平均温度以及炕面热流密度最高,分别为28.10℃和11.88 W/m^(2)。可见蜂窝活性炭的加入有助于提高蓄能炕的热性能,且蜂窝活性炭的孔密度越小,复合蓄能炕的热性能就越好。与传统火炕相比,纯石蜡蓄能炕在经济性方面也占优势。

In order to solve the problems of energy waste and environmental pollution in the heating process of rural areas in northern China in winter,the composite phase change energy storage kang heating system of honeycomb activated carbon and paraffin was designed with solar energy as heat source and paraffin as phase change energy storage material.Under the condition of water supply temperature of 40℃,the thermal properties of pure paraffin energy storage kang and composite energy storage kang with the honeycomb activated carbon pore density of 20 PPI,30 PPI and 40 PPI were analyzed through comparative test.The experimental results show that the new type of energy storage kang can meet the human body′s thermal comfort requirements for night sleep.The composite energy storage kang with the honeycomb activated carbon pore density of 20 PPI has the fastest heating and cooling speeds,which are 0.35℃ and 0.39℃respectively.The temperature standard deviation of 0.39℃ for the kang surface layer of 20 PPI is the lowest,which is 18.75% lower than that of 30 PPI,23.53% lower than that of 40 PPI,and 41.79% lower than that of pure paraffin.The average temperature of 28.10℃ for the sleeping layer and the heat flux density of 11.88 W/m^(2) for the kang surface are the highest respectively.It can be seen that the addition of honeycomb activated carbon helps to improve the thermal performance of the energy storage kang,and the smaller the pore density of the honeycomb activated carbon is,the better the thermal performance of the composite energy storage kang is.Compared with traditional heated brick kang,pure paraffin energy storage kang is also superior in terms of economy.