ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

送風(fēng)風(fēng)速對(duì)蘋果差壓預(yù)冷性能的影響
CSTR:
作者:
作者單位:

作者簡(jiǎn)介:

通訊作者:

中圖分類號(hào):

基金項(xiàng)目:

“十二五”國(guó)家科技支撐計(jì)劃資助項(xiàng)目 (2013BAD19B04) 和歐盟FP7資助項(xiàng)目(PIRSES-GA-2013-612659)


Effect of Air-inflow Velocity on Cooling Efficiency during Forced-air Precooling of Apples
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 圖/表
  • |
  • 訪問(wèn)統(tǒng)計(jì)
  • |
  • 參考文獻(xiàn)
  • |
  • 相似文獻(xiàn)
  • |
  • 引證文獻(xiàn)
  • |
  • 資源附件
  • |
  • 文章評(píng)論
    摘要:

    收后果蔬的及時(shí)預(yù)冷已成為供應(yīng)商一項(xiàng)必備的增值業(yè)務(wù),提高其預(yù)冷均勻性及預(yù)冷速率不僅可以延長(zhǎng)果蔬貨架期、提高預(yù)冷吞吐量,,整體冷鏈物流的經(jīng)濟(jì)效益也可得到直接保證與提升,。以富士蘋果2層瓦楞紙包裝箱為研究對(duì)象,,建立箱體,、襯墊及果品的三維實(shí)體模型,,將果品呼吸熱,、表面蒸發(fā)熱,、冷凝熱及對(duì)流傳熱作為果品區(qū)域內(nèi)部熱源,,利用CFD模擬預(yù)冷過(guò)程中不同送風(fēng)速度下箱體內(nèi)部溫度分布情況,對(duì)比分析不同工況下的冷卻時(shí)間,、瞬時(shí)冷卻速率以及瞬時(shí)冷卻均勻性,,從冷卻時(shí)間與冷卻所需能耗考慮給出較佳的預(yù)冷送風(fēng)速度。研究結(jié)果表明,,當(dāng)送風(fēng)速度超過(guò)2.5m/s時(shí),,其制冷時(shí)間、冷卻速率及冷卻均勻性無(wú)顯著改善,,通過(guò)將果品F6,、S6表層、中心溫度模擬值與實(shí)驗(yàn)值對(duì)比驗(yàn)證得出,,溫度最高偏差不大于1.5℃,,其最大均方根誤差與平均相對(duì)誤差分別為1.179℃和13.6%。該研究為提高蘋果通風(fēng)包裝箱內(nèi)部預(yù)冷均勻性,,選取較佳的送風(fēng)速度,,降低預(yù)冷時(shí)間及減少不必要的預(yù)冷能耗提供了理論參考。

    Abstract:

    To ensure the quality and safety, and extend storage and shelf life of horticultural products across the entire coldchain, a critical step in the postharvest cold chain is rapid precooling after harvest to remove field heat. This work established a threedimensional mathematical model of airinflow and heat transfer for analyzing the aerodynamic and thermal forcedconvection cooling of vented packages simultaneously. A direct model that uses the explicit geometry of stacked products in boxes was developed earlier and was used to study the local and average airinflow through stacks of horticultural products (the package wall, trays and apples). This study is based on an existing twolayer corrugated box for precooling fresh apples. We accounted for the heat of respiration, transpiration, condensation and convective heat flow inside the produce zone. The results show that a reasonable increasing cooling rate and uniformity are obtained with an increase in airinflow velocity to 2.5m/s; any further increase in airinflow velocity simply wastes energy because it leads to a relatively low increase in cooling rate and uniformity. The model was verified by comparing its results to those of experiments. The predicted results were consistent with the measured results. The maximum temperature deviation was less than 1.5℃, and the maximum root mean square error and average relative error for produce temperature were 1.179℃ and 13.6%, respectively. This research thus provides a reliable theoretical basis for improving air-inflow and produce-temperature uniformity and minimizing energy consumption during forcedconvection cooling of produce.

    參考文獻(xiàn)
    相似文獻(xiàn)
    引證文獻(xiàn)
引用本文

韓佳偉,趙春江,楊信廷,錢建平,邢 斌,范蓓蕾.送風(fēng)風(fēng)速對(duì)蘋果差壓預(yù)冷性能的影響[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2015,46(11):280-289. Han Jiawei, Zhao Chunjiang, Yang Xinting, Qian Jianping, Xing Bin, Fan Beilei. Effect of Air-inflow Velocity on Cooling Efficiency during Forced-air Precooling of Apples[J]. Transactions of the Chinese Society for Agricultural Machinery,2015,46(11):280-289.

復(fù)制
分享
文章指標(biāo)
  • 點(diǎn)擊次數(shù):
  • 下載次數(shù):
  • HTML閱讀次數(shù):
  • 引用次數(shù):
歷史
  • 收稿日期:2015-07-09
  • 最后修改日期:
  • 錄用日期:
  • 在線發(fā)布日期: 2015-11-10
  • 出版日期: 2015-11-10
文章二維碼