无霜冰箱蓄热化霜系统的理论分析及其蓄热材料的实验研究

The Theoretical Analysis of a New Type of Frost-free Refrigerator Thermal Storage Defrosting System and the Experimental Study on its Heat Storage Material

风冷无霜冰箱因其大容积和无霜的优势逐渐占有冰箱主流市场,但现在的电热化霜模式耗电量大,制约了风冷无霜冰箱的发展。提出了一种用于无霜冰箱的新型的蓄热化霜系统,分析了蓄热系统的可行性,提出了整体系统的运行方式,设计了蓄热装置的结构,实验分析了蓄热材料的性能,优选出了一种以石蜡为主的复合相变蓄热材料。整体系统理论上能够回收40-50℃的冰箱冷凝余热,经过10小时的蓄热,可以提供300W的化霜加热功率,并维持20min。

Because of its advantage of large volume and the frost-free, Air-cooled frost-free refrigerators have occupied the main market of refrigerators. But the large power consumption of electric heating up the frost patterns restrict the development of air cooling frost-free refrigerator. In this paper, a new type of frost-free refrigerator thermal storage defrosting system is put forward, the feasibility of the thermal storage defrosting system is analyzed, operation mode of the overall system is put forward, the structure of the heat storage device is designed, the performance of the heat storage material is analyzed experimentally, and a composite phase change material based on paraffin is optimized. In theory, the system can collect the refrigerator condensing heat ranged from 40-50℃. And In 10 hours to complete the accumulation of heat, the system can provide the heating power of defrosting for 300 W, and maintain 20 min.