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【生活百科】雪柜变频是潮流  冰冻能力更重要


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变频技术在冷气机(空调)已应用多年,市场大致接受;早几年开始把变频技术应用到雪柜(冰箱)上,是否同样做到节能省钱的效果呢?

变频是改变供电频率,调节负载,从而降低功耗,减小损耗,延长设备使用寿命。以冷气机为例,传统定速空调压缩机依靠不断「开、停」来调整室温,一开一停之间容易造成忽冷忽热,并消耗较多能量。

运用变频控制技术,冷气机可根据环境温度自动选择制热、制冷和除湿运转方式,短时间达到所需要的温度并在低转速、低能耗状态下以较小的温差波动,实现了快速、节能和舒适控温效果。变频冷气机能省电30%以上。

雪柜与空调不同,由于制冷空间不大,能耗也不大,每天才一两度电,功耗只是空调的几分之一甚至更少,所以单纯从节能省钱的角度而言,变频雪柜意义并不太大。

变频技术除了节能优势外,还有控温波动小的优势,雪柜内部温度保持在一个较小的波动范围,理论上对食物的保鲜期限有积极意义,但在实际生活中,控温优势并不十分明显,毕竟一般食物并不会因为较小的温度波动而马上变坏或变差。

选择雪柜还是以制冷方式(参见《雪柜的制冷方式  有霜无霜你话事》)、雪柜容积大小(冷藏与冷冻室的容积比例)、冷冻能力、输入功率等作初步选择

冷冻能力是一个重要参数,指雪柜能将多少公斤的食物,在24小时内从摄氏25度冷冻到-18度(一般肉类的保鲜温度)。容积大的雪柜冷冻能力一般要在12公斤以上。冷冻能力强雪柜温度下降较快,减少压缩机的运转;食物迅速冷冻更能保持新鲜。

至于输入功率,太小会导致雪柜压缩机长时间不停机,“小马拉大车”导致过劳,耗电又缩短雪柜寿命。输入功率可以在雪柜机身背后标签找到。输入功率越大越好,特别是大容积雪柜。比如238L雪柜的压缩机功率只有90W,188L的功率却有110w,这就好比在一个25平方的房子里面装了一台1.5匹的空调,和在另一个15平方房间里面装1.5匹空调的效果对比。

【文:曾凡祥】
曾入住大学及公司宿舍、公共房屋、唐楼、村屋,单栋楼、大型屋苑,略懂家居生活要求。