本文選題：冷藏箱體 + 相變材料　； 參考：《上海理工大學(xué)》2015年碩士論文

【摘要】：將相變材料應(yīng)用到冷藏(車)箱體壁面上,以延緩箱體內(nèi)部空間貨物的溫度上升,是一項新的技術(shù)。冷藏(車)箱體不僅可以用于新鮮果蔬等食品的品質(zhì)儲藏及運輸,也可以應(yīng)用于藥品,如疫苗、血液及胰島素的低溫存儲及運輸。本課題配比了一種適用于冷藏(車)箱體的相變蓄冷材料,它具有合適的相變溫度,符合新鮮果蔬、食品的品質(zhì)冷藏需求及藥品質(zhì)量如血液、疫苗等冷藏要求,具有較高的潛熱,滿足冷藏裝置的儲能要求低,無毒、無害等一系列的特性。同時利用模擬軟件模擬了冷藏箱體的壁面及箱體內(nèi)部的傳熱過程,并按照實際冷藏集裝箱體的比例縮小,搭建了一套半導(dǎo)體制冷系統(tǒng)的冷藏箱實驗臺進(jìn)行試驗研究。1、利用超聲波細(xì)胞粉碎機(jī)的超聲震蕩原理,將正十四烷烴與正十二烷烴按照一定的比例,混合一定的時間,形成了互溶的復(fù)合相變材料。2、利用差示掃描量熱法(DSC)測量了復(fù)合相變材料的熱物性參數(shù),其相變溫度為2.15℃,潛熱值為175J/g,符合新鮮果蔬、食品品質(zhì)及藥品質(zhì)量的冷藏需求。3、利用COMSOL軟件對冷藏箱體的壁面及箱體內(nèi)部的空間進(jìn)行了模擬與分析計算,結(jié)果證明:箱體壁面中相變材料的添加能夠使箱體與外界環(huán)境溫度完全隔離;箱體壁面中添加相變材料能夠減小箱體內(nèi)部溫度的波動,延緩箱體內(nèi)部空間溫度的上升。4、設(shè)計并搭建了具有蓄冷功能的復(fù)合相變材料冷藏箱體實驗裝置。采用半導(dǎo)體制冷系統(tǒng),高密度聚乙烯薄板保溫系統(tǒng)。5、以上海青為例研究葉菜類各部位在是否添加相變材料的冷藏箱體中降溫過程、低溫存儲及復(fù)溫過程中溫度的變化規(guī)律。結(jié)果表明:1)在降溫過程中,相變材料能夠延緩箱體內(nèi)溫度的降低,有利于大葉脈處的水分通過導(dǎo)管的運輸作用及時的送到小葉脈及葉片處,減小了大葉脈與小葉脈及葉片處的溫差,防止葉片的凍傷。2)在低溫存儲過程中,相變材料的固液相變能夠吸收或釋放制冷系統(tǒng)的一部分冷量,減緩上海青各部位之間的溫差波動;3)在升溫過程中,由于相變材料的潛熱儲能,延緩箱體內(nèi)部空間及上海青各部位的溫度上升,在升溫過程中,大葉脈、小葉脈及葉片處一直存在溫差,且溫差出現(xiàn)先增大后減小的趨勢。因此,相變材料在相變過程中利用存儲的冷量使上海青各部位溫差波動減小,增加低溫存儲的時間及減緩升溫,對研究葉菜類果蔬的冷藏保鮮具有一定的應(yīng)用價值與前景。
[Abstract]:It is a new technology to apply phase change material to the wall of the refrigerated (car) box to delay the temperature rise of the space cargo inside the box. Refrigerated boxes can be used not only for storage and transportation of fresh fruits and vegetables, but also for low temperature storage and transportation of medicines, such as vaccines, blood and insulin. In this paper, a phase change storage material suitable for refrigerating (car) box is developed, which has the appropriate phase change temperature, meets the requirements of fresh fruits and vegetables, food quality, cold storage and medicine quality, such as blood, vaccine, etc. It has high latent heat and meets the requirements of low energy storage, non-toxic, harmless and so on. At the same time, the heat transfer process on the wall and inside of the refrigerator is simulated by using the simulation software, and the proportion of the refrigerated container is reduced according to the actual scale. In this paper, a set of refrigerator test bench of semiconductor refrigeration system was set up for experimental study. By using the ultrasonic oscillation principle of ultrasonic cell crusher, n-tetradecane and n-dodecane were mixed for a certain time according to a certain proportion. The thermal properties of the composite phase change materials were measured by differential scanning calorimetry (DSC). The phase transition temperature was 2.15 鈩，

本文編號：1875781