采用并联双制冷系统的立式风冷陈列柜的性能研究

Study on the performance of air-cooled vertical display cabinet with two parallel refrigeration systems

商用冷柜能效新标准(GB26920.2—2015《商用制冷器具能效限定值和能效能级第二部分:自携冷凝机组商用冷柜》)在2017年正式实施,要求商用冷柜进一步节能降耗。本文通过研究商用冷柜的产品特性,对其进行技术改进,提出了一种并联双压缩机制冷系统,并将其应用在商用立式风冷陈列柜上,试验探究并联双压缩机制冷系统对陈列柜性能的影响及降低其耗电量的方法。试验结果表明,通过合理的设计并联双制冷系统,同时对陈列柜毛细管长度及充注量,双压缩机控制策略和风机运行策略3方面进行优化,最终陈列柜在冷冻工况下的耗电量仅有5.4 kW·h/24 h,在冷藏工况下耗电量为1.15 kW·h/24 h,分别是新国标中一级能效规定值的60%和72%。

The new energy efficiency standards for commercial freezers were officially implemented in 2017,and the energy consumption of the commercial freezers needs further reduction.This paper studies the operation characteristics of commercial freezers and obtains technical improvements.A parallel refrigeration system is proposed in the paper and applied to the commercial vertical air-cooled display cabinet to explore the effect of the new system on the performance of the freezer and to obtain the methods of reducing the power consumption.The experimental results show that through the rational design of the parallel refrigeration system and optimizing the control strategy of the compressor and the fan,the power consumption of the display cabinet at the standard freezing and refrigeration test conditions are 5.4 kW·h/24 h and 1.15 kW·h/24 h respectively,which are 60% and 72% of the specified energy consumption measured by the first level energy efficiency according to the new national standard.Thus,the energy saving effect of the parallel refrigeration system is remarkable.