室内环境对自然冷源陈列柜冷藏性能影响实验研究

Research on the effect of indoor environment on the refrigeration performance of natural cold display cabinet

通过试验研究的方法,将自然冷源引入冷藏陈列柜,在完全利用室外冷源对陈列柜柜内进行供冷的运行模式下,保持风幕送风速度为1.1m/s,室外送风温、湿度分别为1.0℃、60%,室内湿度为60%不变,调节室内不同的温度,观察柜内食品包温度变化分布,研究陈列柜食品包冷藏特性。实验结果表明：与利用制冷系统供冷的传统陈列柜相比,自然冷源供冷使柜内温度分布均匀性得到很大提升,自然冷源陈列柜1～5层同侧食品包温差不超过1.5℃,但是每层内侧和外侧食品包温差在2.5～3.0℃。在此送风条件下,保证室内温度在22.0℃以下可以满足柜内食品贮藏温度0.0～7.0℃的要求。风幕参数变化规律：随着食品包前端距离的增加相对湿度呈现先增大后减小,最后稳定于和室内湿度相等的趋势。风速和温度呈逐渐减小的趋势,且变化速率不断减小。

The natural cool source was applied to the refrigerated display cabinet,and the experiment was designed to investigate the display cabinet characteristics by observing the temperature change of the food package inside the display cabinet at different indoor temperatures,but same air curtain velocity of 1.1 m/s,outdoor temperature of 1.0℃,outdoor humidity of 60%RH and indoor humidity of 60% RH.The experimental results show that the uniformity of temperature in the display cabinet is greatly improved compared with the traditional display cabinet using refrigeration system.The temperature difference in 1-5 layer food package is less than 1.5℃in the same side of display cabinet with natural cold source,and the temperature difference between the inner and outer side of each layer is between 2.5 ℃ and 3.0 ℃.The storage temperature demand of 0.0-7.0 ℃in display cabinet can be achieved under the condition that the indoor temperature is less than 22.0℃.With the increase of the distance from the front of the food package,the relative humidity increases firstly and then decreases,and finally is stabilized in accordance with indoor humidity.The wind speed and temperature show decreasing trends,and the change rates decrease gradually.