Experimental investigation on a vertical display cabinet with central air supply
Experimental investigation on a vertical display cabinet with central air supply
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DOI：
10.1016/j.enconman.2009.05.012
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发表时间：
2009-09
影响因子：
10.4
通讯作者：
Ke-zhi Yu;G. Ding;Tian-ji Chen
中科院分区：
文献类型：
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作者：
Ke-zhi Yu;G. Ding;Tian-ji Chen
陈列柜中空冷器的结霜和除霜通常会导致较大的温度波动，从而增加陈列柜的能耗。建立了中央送风立式陈列柜(VDCCAS)，并与传统的立式陈列柜(CVDC)进行了对比实验。VDCCAS的制冷系统由压缩机、冷凝器、恒温膨胀阀(TEV)和蒸发器组成，独立于机柜，由蒸发器冷却的冷风通过风道送到机柜实现制冷。与CVDC相比，VDCCAS可以方便地控制风幕速度，减小霜量，将除霜周期从6h提高到9h，将除霜周期中的最大产品温升从3.0℃降低到2.0℃。为了达到最低的柜内温度分布，风幕的最佳风速为0.7-0.8m/S，最佳雷诺数为4350-5000。当两个机柜一起工作时，两个机柜的气流比应为1.1-1.2，以保持两个机柜之间的温度平衡。
The frosting and defrosting of air cooler in a display cabinet usually lead to a large temperature fluctuation, thus increase the energy consumption of the display cabinet. In this paper, a vertical display cabinet with central air supply (VDCCAS) is established, experimented and compared with a conventional vertical display cabinet (CVDC). The refrigeration system of the VDCCAS consisting of a compressor, a condenser, a thermostatic expansion valve (TEV) and an evaporator is independent of the cabinet in a VDCCAS, and the cold air cooled by the evaporator is supplied through the air duct to the cabinet to realize refrigeration. Comparing to the CVDC, the VDCCAS can easily control the air curtain velocity, decrease the frost magnitude, increase the defrost cycle from 6h to 9h, and reduce the maximum product temperature rise in the defrost cycle from 3.0°C to 2.0°C. To reach the lowest temperature distribution in the cabinet, the optimum velocity of the air curtain is 0.7–0.8m/s and the optimum Reynolds number is 4350–5000. When two cabinets work together, the airflow ratio of the two cabinets should be 1.1–1.2 in order to keep the temperature balance between the two cabinets.