分段化霜在家用分体空调上的应用研究

The application research on subsection defrosting in domestic split air conditioners

分别采用热气旁通和空气融霜两种方法对分段化霜进行试验研究。试验结果表明:分段除霜能在化霜的同时保持室内的持续供热,室内温度波动较逆循环化霜小;热气旁通分段化霜在室外0/0℃工况下可连续运行四个化霜周期,且化霜效果较好;空气融霜分段化霜在室外2/1℃工况下可连续运行四个化霜周期,且化霜效果较好;过冷管在几个化霜周期后存在结冰现象,难于化干净,因此分段除霜不适合用在有过冷管的换热器上,但可作为一种辅助的化霜方式,用于提高制热能力和能效比。

The methods of hot vapor bypass and ambient air defrosting were used to experimental study on subsection defrosting. The experimental results showed that： subsection defrosting could keep the room heating continuously and the indoor temperature fluctuation smaller than reverse-cycle defrosting; hot vapor bypass subsection defrosting could continuously run for four defrosting cycle under the condition of outdoor 0/0℃,and the defrosting effect was better; ambient air defrosting subsection defrosting could continuously run for four defrosting cycle under the condition of outdoor 2/1℃,and the defrosting effect was better; the undercooling tube would be freezed after several defrosting cycles, and the ice was hard to melt, so subsection defrosting disagreed with the heat exchanger with undercooling tube, but could be used as an auxiliary method for improving the capacity and COP.