小型果蔬装配式冷库工作时间系数与能效评价分析  

Analysis on Working Time Coefficient and Energy Efficiency Evaluation of Small Assembly Cold Storage for Fruit and Vegetables

作　　者：张秋玉 臧润清 

机构地区：[1]天津商业大学冷冻冷藏技术教育部工程研究中心天津市制冷技术工程中心,天津300134

出　　处：《制冷学报》2018年第1期121-126,共6页Journal of Refrigeration

基　　金：天津市科技计划(14TXGCCX00018)项目资助~~

摘　　要：本文对果蔬装配式冷库稳定运行阶段进行实验研究,测试冷库在不同环境温度下的开、停机时间,建立冷库稳定运行阶段开、停机时间和工作时间系数数学模型,运用MATLAB编程计算装配式冷库在不同夹心板厚度和不同制冷系统配置下的工作时间系数。结果表明:开、停机时间数学模型经修正后,开机时间最大误差由11.6%减小到2.78%,停机时间的计算值最大误差由7.91%减小到1.46%,大大提高了开、停机时间计算精度。工作时间系数模型计算值与实验值最大误差在3.47%以内,果蔬装配式冷库稳定运行阶段工作时间系数数学模型具备工程应用精度。相同环境温度下,随制冷系统制冷量的增加,工作时间系数减小幅度越来越小,制冷剂流量界限选择0.012 kg/s较为合适。随库板厚度的增加,工作时间系数减小幅度越来越小,保温体一次投资也相应增加,从经济性角度考虑,对使用时间较短的临时性冷库,保温层厚度按推荐值100 mm即可,冷库使用时间较长时,保温层厚度在100 mm基础上可以适当增加。Experiments were performed over the steady running period of assembly cold storage, and the working and stopping time of the refrigerating unit was tested under different environmental temperatures. A calculation model for the working and stopping time and the working time coefficient were established. MATLAB was used to calculate the working time coefficient of the assembly cold storage under different insulation thicknesses and different refrigeration units. The results show that the maximum working time error decreased from 11. 6% to 2. 78% after the mathematical model was revised, and the stopping time decreased from 7. 91% to 1.4 6 % . The maximum error between the calculated and experimental values of the working time coefficient was 3.47% , which indicates high precision. As the refrig-erating capacity increased, the rate of decrease in the working time coefficient became smaller, and it was found to be appropriate to limit the refrigerant flow to 0. 012 kg/s. Similarly, as the insulation thickness increased, the rate of decrease in the working time coefficient be-came smaller, the initial investment of insulation was also accordingly increased. From an economic point of view, thickness of insulation was recommended for 100 mm for temporary cold storage, and insulation thickness can be increased by 100 mm when cold storage was used longer.

关 键 词：装配式冷库 工作时间系数 能效 开机时间 停机时间 

分 类 号：TB611[一般工业技术—制冷工程] TB657.1