本文關(guān)鍵詞： 冷藏商品 運輸包裝 ANSYS FLOTRAN 溫度分布 層次分析法　出處：《陜西科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：國內(nèi)經(jīng)濟的快速增長提高了國內(nèi)消費水平。高價值的水果,蔬菜和海鮮水產(chǎn)品的消費量逐年增高,因此冷藏物品的運輸量也逐年提高,特別是在肉類,果蔬,乳制品,醫(yī)藥領(lǐng)域,冷鏈運輸?shù)钠占俺潭扔l(fā)增強。貨物冷藏運輸中,對于貨物溫度的控制尤為重要,溫度的大幅度變化會影響產(chǎn)品的品質(zhì),造成損失。所以在運輸環(huán)節(jié)中,溫度的控制對于保護商品質(zhì)量起著至關(guān)重要的作用。故研究分析運輸過程中的車廂內(nèi)部和貨物包裝箱的溫度場分布,溫度變化情況,對于商品的運輸包裝具有重要指導(dǎo)意義。 但是冷鏈運輸?shù)倪\費較為高昂,為保持低溫需要消耗大量的能源,制冷系統(tǒng)在運輸過程中消耗40%的柴油。在不損害包裝物的前提下,合理的選擇出制冷溫度與制冷時間與運輸方式,以達到減少能耗,從而降低運輸成本,得出保護包裝物的包裝運輸?shù)淖罴逊桨傅哪康摹?本課題的目標(biāo)旨在降低冷藏商品的運輸包裝成本。本課題以三個方面對此問題進行探討： 本課題總結(jié)了針對冷藏物品包裝的設(shè)計方法,重點分析了在低溫高濕度環(huán)境下的瓦楞紙箱的抗壓強度和堆碼強度,保證了貨物在運輸過程中不受到損壞,降低破損率。為進一步研究瓦楞紙箱抗壓強度奠定了基礎(chǔ),為瓦楞紙箱的設(shè)計起到參考作用。此研究對于冷藏物品的運輸包裝標(biāo)準(zhǔn)化,規(guī)范化有一定的指導(dǎo)意義。 運用傳熱學(xué)原理和流體力學(xué)原理分析了制冷設(shè)備工作時瓦楞紙箱的熱交換過程,理論分析了冷藏車廂及瓦楞紙箱的傳熱過程,建立了瓦楞紙箱的熱平衡方程。利用ANSYS FLOTRAN有限元軟件對冷藏商品在運輸環(huán)節(jié)中熱交換進行耦合場分析,模擬出了冷藏空間內(nèi)部及貨物區(qū)域的溫度場,以及商品自身溫度非線性變化情況。以冷藏車內(nèi)部溫度變化為研究對象,以香梨作為運輸商品,建立車廂溫度場分布的計算模型,模擬不同的風(fēng)機制冷溫度下(0℃和3℃)不同制冷方式貨物的溫度變化情況。結(jié)果表明制冷溫度為3℃,每制冷10分鐘后停止運行15分鐘,在整個運輸過程中制冷設(shè)備工作時間為50分鐘的制冷方式與制冷溫度為0℃,每制冷15分鐘后停止運行20分鐘,在整個運輸過程中制冷設(shè)備工作時間為60分鐘的制冷方式相比,減少1.05×103KJ的能量消耗,能耗降低了27.7%,降低了商品的運輸成本。該研究為合理的選擇制冷溫度及制冷方式及實現(xiàn)減少能源消耗,減少運輸包裝成本提供了依據(jù)。 運用層次分析法建立了針對冷藏物品的運輸方式選擇方案的模型,對指標(biāo)和各個方案并加以分析與計算,得出最優(yōu)的方案,評估結(jié)果是定量化的,直觀的,該評估模型是有效的,客觀的。選擇出合理的方案,降低了商品在流通領(lǐng)域的運輸成本。
[Abstract]:The rapid growth of the domestic economy has raised the domestic consumption level. The consumption of high-value fruits, vegetables and seafood and aquatic products has increased year by year, so the volume of refrigerated items has also increased year by year, especially in meat, fruits and vegetables, dairy products, In the field of medicine, the popularity of cold chain transportation is increasing. In refrigerated transportation of goods, it is particularly important to control the temperature of the goods. A large change in temperature will affect the quality of products and cause losses. The control of temperature plays an important role in protecting the quality of goods, so it is of great significance to study and analyze the distribution of temperature field and the change of temperature in the inside of the carriage and the packing box in the course of transportation, which is of great significance for the transportation and packaging of goods. But the transportation costs of the cold chain are high. In order to maintain the low temperature, the refrigeration system consumes 40% of diesel oil in the process of transportation to maintain a large amount of energy. In order to reduce the energy consumption, reduce the transportation cost and get the best plan to protect the packaging transportation, the refrigeration temperature, the refrigeration time and the transportation mode are selected reasonably. The purpose of this project is to reduce the transportation and packaging cost of refrigerated goods. This paper summarizes the design method of packaging for refrigerated items, especially analyzes the compressive strength and stacking strength of corrugated cartons under low temperature and high humidity, which ensures that the goods will not be damaged in the course of transportation. It lays a foundation for further study on the compressive strength of corrugated cartons and serves as a reference for the design of corrugated cartons. This study has a certain guiding significance for the standardization of transport packaging of refrigerated items. The heat transfer process of corrugated paper box is analyzed by means of heat transfer theory and hydrodynamic principle, and the heat transfer process of refrigerated car and corrugated paper box is analyzed theoretically. The heat balance equation of corrugated paper box is established. The coupled field analysis of heat exchange in transportation of refrigerated goods is carried out by using ANSYS FLOTRAN finite element software, and the temperature field inside the refrigerated space and in the cargo area is simulated. Taking the internal temperature change of refrigerated car as the research object, taking fragrant pear as the transportation commodity, the calculation model of the temperature field distribution of the carriage is established. The results show that the refrigeration temperature is 3 鈩，

本文編號：1495297