新疆地区水果冷藏太阳能水蒸汽喷射CO_2制冷系统

CO_2 Refrigeration System of Solar Energy Water Vapor Ejector for Fruit Cold Storage in Xinjiang Region

针对新疆地域和生产水果的特点,设计了太阳能热源、水和CO2为工质的水果冷藏制冷系统。通过计算分析得出,CO2循环蒸发温度提高,外界环境温度升高,太阳能辐射强度增加,喷射器引射率提高,系统的耗能减小。外界环境温度每增加1℃,太阳能集热器的面积减小0.5m2,太阳能辐射强度每增加10W/m2,太阳能集热器的面积减小1.2m2,喷射器的引射率每提高0.01,太阳能集热器的面积减小0.8m2。与发生器的热源全部来自电能的系统运行情况相比,吐鲁番地区葡萄冷藏2个月节约运行费用达96.2%,哈密地区哈密瓜冷藏15天节约运行费用约94.4%,库尔勒地区香梨冷藏6个月节约运行费用约41.1%,库车地区白杏冷藏21天节约运行费用约74.2%。设计时应针对使用场所,优化选取设计参数,减少设备初投资。

According to the characteristics of environment and fruit in Xinjiang region, a refrigeration system driven by solar energy for fruit cold storage was designed. This refrigeration system using solar energy as heat source, water and CO2 as working fluid, can provide fit temperature environment needed by different fruit cold storage. By calculation and analysis on this refrigeration system, the results are obtained that the energy-consuming of this refrigeration system reduce as the enhancing of the evaporation temperature of CO2 refrigeration cycle, the temperature of outside environment, the radiant intensity of solar energy and the entrainment ratio of ejector. When the temperature of outside environment increase 1%, the area of solar collector reduce 0.5 m2, the radiant intensity of solar energy increase 10 W/m2, the area of solar collector decline 1.2 m2, and the entrainment ratio of ejector enhance 0.01, the area of solar collector decrease by 0.8m2. By comparing the system driven by solar energy with that driven by full- electricity, the results are obtained that in Turpan area, the system driven by solar energy economizes about 96.2% of running cost for cold storage grape two months long, in Hami area, the system driven by solar energy can achieve a reduction of about 94.4% of running cost for cold storage honey-dew melon about 15 days, and in Korla area, the system driven by solar energy can reduce running cost about 41.1% for cold storage fragrant pear about six months, moreover the running cost consumption of the system driven by solar energy may be reduced about by 74.2% for cold storage white apricot about 21 days in Kuqa. So the design parameters are optimized according to the running condition for reducing cost and saving energy.