| 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，根据冷库使用时间长短，保温层厚度可以在100 mm基础上适当增加。 |
| 关键词: 装配式冷库 工作时间系数 能效 开机时间 停机时间 |
| DOI： |
| Received:March 30, 2017 |
| 基金项目:天津市科技计划项目(14TXGCCX00018) |
|
| Analysis on Working Time Coefficient and Energy Efficiency Evaluation of Small Assembly Cold Storage for Fruit and Vegetables |
|
Zhang Qiuyu, Zang Runqing
|
| (Tianjin University of Commerce, Refrigeration Engineering Research Center of Ministry of Education, Tianjin Refrigeration Engineering Technology Center) |
| Abstract: |
| 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 1.46%. The maximum error between the calculated and experimental values of the working time coefficient was 3.47%, which indicates high precision. As the refrigerating 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 became smaller, and the insulation thickness was increased by 100 mm according to the working time of the cold storage. |
| Key words: assembly cold storage working time coefficient energy efficiency working time stopping time |
