CAJ | 학술논문

为掌握液氮充注式果蔬气调保鲜运输箱能耗规律，该文分析了运输箱的传热传质过程及其能耗构成，在分别研究了气调过程、制冷过程和加湿过程的基础之上建立了液氮充注式果蔬气调保鲜运输箱能耗模型，并对所建能耗模型进行了试验验证。研究结果表明，液氮充注式果蔬气调保鲜运输箱能耗主要由气调能耗、制冷能耗和加湿能耗构成；根据能耗模型所得的理论能耗与试验能耗基本一致，平均相对误差为11.86%±4.29%；根据能耗模型所得的理论液氮消耗量与试验液氮消耗量基本一致，平均相对误差为11.60%±3.51%；液氮充注气调过程消耗较少能耗即可产生较大的附加制冷总量，并且气调附加制冷总量与箱体气调体积有关，在该验证试验中理论液氮充注气调附加制冷总量所占理论制冷总量的比例达22%左右。该研究为液氮充注式果蔬气调保鲜运输装备优化以及果蔬保鲜运输节能提供参考。
위장악액담충주식과소기조보선운수상능모규률，해문분석료운수상적전열전질과정급기능모구성，재분별연구료기조과정、제랭과정화가습과정적기출지상건립료액담충주식과소기조보선운수상능모모형，병대소건능모모형진행료시험험증。연구결과표명，액담충주식과소기조보선운수상능모주요유기조능모、제랭능모화가습능모구성；근거능모모형소득적이론능모여시험능모기본일치，평균상대오차위11.86%±4.29%；근거능모모형소득적이론액담소모량여시험액담소모량기본일치，평균상대오차위11.60%±3.51%；액담충주기조과정소모교소능모즉가산생교대적부가제랭총량，병차기조부가제랭총량여상체기조체적유관，재해험증시험중이론액담충주기조부가제랭총량소점이론제랭총량적비례체22%좌우。해연구위액담충주식과소기조보선운수장비우화이급과소보선운수절능제공삼고。
China is a country that produces and consumes large amounts of fruits and vegetables. During fresh-keeping transportation, energy consumption rises with the increase of traffic volume of fruits and vegetables. The fresh-keeping transportation container with controlled atmosphere by liquid nitrogen injection is an advanced and efficient equipment for transporting fruits and vegetables. However, there is little research on the energy consumption regulations of this kind of fresh-keeping transportation container so this article puts forward a research method. Fresh-keeping transportation with controlled atmosphere by liquid nitrogen injection for fruits and vegetables keeps the temperature, relative humidity, and oxygen volume fraction of the transportation container in a state of relative balance, which could meet the demand for fruit and vegetable fresh-keeping. However, due to the influence of heat transferring towards the container, cold consuming of electrical appliances, cold consuming of fruits and vegetables, heat transferring by door opening, aperture heat leaking, container pre-cooling, and solar radiation in transportation, the equilibrium states of fresh-keeping environment in the container is broken. In addition, heat and mass transferring between the inside and outside of the container has begun. At this time, the fresh-keeping equipments started to keep the equilibrium states of fresh-keeping environment, and then energy consumption was generated. The fresh-keeping equipments of controlled atmosphere fresh-keeping transportation container by liquid nitrogen injection consist of refrigeration, humidification, and controlled atmosphere system, and the energy consumption generated from these three equipments. Finally, the energy consumption model was established based on the analysis of the heat and mass transfer and energy consumption in refrigerating, humidifying, and injecting. After the energy consumption model was set up, the verification experiment was carried out using litchi as testing material and was based on fresh-keeping transportation platform with controlled atmosphere by liquid nitrogen injection for fruits and vegetables. The fresh-keeping transportation platform can adjust the temperature, relative humidity, and oxygen volume fraction in the container automatically and intelligently through refrigeration, humidification, and controlled atmosphere system, creating a suitable fresh-keeping environment for the litchi. Results indicated that the energy consumption was mainly composed of the controlled atmosphere energy, refrigerating energy consumption, and humidifying energy. The theoretical energy consumption obtained through the energy consumption model was basically consistent to the experimental energy consumption with the average relative error of 11.86%±4.29%. The theoretical liquid nitrogen consumption value was basically consistent to the experimental liquid nitrogen consumption mass with the average relative error of 11.60%±3.51%. The total refrigerating capacity from the controlled atmosphere process was associated with the controlled atmosphere volume of the container. What’s more, by consuming less energy, the controlled atmosphere could produce a large total refrigerating capacity that accounted for about 22% of the total theoretical refrigerating capacity in the experimental verification. This research provides a reference for optimizing the equipments of controlled atmosphere transportation by liquid nitrogen injection and saving energy of fruits and vegetables during fresh-keeping transportation.