【摘要】：隨著果蔬產(chǎn)業(yè)的不斷發(fā)展,人們對(duì)果蔬的需求量及其品質(zhì)要求同步增加。果蔬難儲(chǔ)藏,易腐爛,保鮮庫(kù)能有效減少果蔬儲(chǔ)藏過(guò)程中的損失。為了確定果蔬保鮮儲(chǔ)藏的最佳環(huán)境條件,實(shí)現(xiàn)果蔬儲(chǔ)藏后仍能保持最佳品質(zhì),結(jié)合沈陽(yáng)市科技計(jì)劃項(xiàng)目"寒富蘋果的可移動(dòng)式自動(dòng)測(cè)控與預(yù)報(bào)儲(chǔ)藏保鮮庫(kù)的研發(fā)"的內(nèi)容,本文對(duì)實(shí)際保鮮庫(kù)進(jìn)行數(shù)值模擬計(jì)算分析,并設(shè)計(jì)了適合保鮮庫(kù)的無(wú)線溫濕度監(jiān)控系統(tǒng),以寒富蘋果為對(duì)象進(jìn)行了儲(chǔ)藏試驗(yàn)研究,研究?jī)?nèi)容與結(jié)論如下。(1)果蔬保鮮庫(kù)保鮮技術(shù)、數(shù)值模擬技術(shù)及無(wú)線監(jiān)控系統(tǒng)現(xiàn)狀分析。在對(duì)果蔬保鮮庫(kù)保鮮技術(shù)發(fā)展現(xiàn)狀分析的基礎(chǔ)上,對(duì)數(shù)值模擬及溫濕度無(wú)線監(jiān)控系統(tǒng)的技術(shù)進(jìn)行研究,提出采用數(shù)值模擬與溫濕度無(wú)線監(jiān)控系統(tǒng)技術(shù)相結(jié)合的方法,改善果蔬保鮮庫(kù)的儲(chǔ)藏環(huán)境,提升果蔬儲(chǔ)藏品質(zhì)。(2)保鮮庫(kù)結(jié)構(gòu)設(shè)計(jì)及數(shù)值模擬分析。在對(duì)保鮮庫(kù)結(jié)構(gòu)設(shè)計(jì)的基礎(chǔ)上,對(duì)庫(kù)體內(nèi)三種不同蘋果箱擺放方式的速度場(chǎng)進(jìn)行模擬分析,得到不同位置不同方向的二維速度矢量圖。結(jié)果表明:蘋果箱之間前后間隔3cm,左右間隔5cm的擺放方式,庫(kù)內(nèi)氣流分布均勻且有大回流漩渦,有利于保鮮庫(kù)庫(kù)內(nèi)降溫,并可以有效散失蘋果箱內(nèi)因蘋果呼吸作用而產(chǎn)生的熱量。(3)保鮮庫(kù)無(wú)線溫濕度監(jiān)控系統(tǒng)設(shè)計(jì)。設(shè)計(jì)基于nRF24L01+無(wú)線通信模塊的溫濕度監(jiān)控系統(tǒng),系統(tǒng)包括監(jiān)測(cè)控制單元、數(shù)據(jù)傳輸單元及上位機(jī)監(jiān)控單元,軟件設(shè)計(jì)采用模塊化編程思想,實(shí)現(xiàn)主程序調(diào)用各模塊的子程序。通過(guò)硬件系統(tǒng)的設(shè)計(jì)及軟件系統(tǒng)編程,能夠?qū)崿F(xiàn)保鮮庫(kù)溫濕度環(huán)境參數(shù)的無(wú)線準(zhǔn)確監(jiān)控。除了主要的溫濕度監(jiān)控功能,還實(shí)現(xiàn)在保鮮庫(kù)庫(kù)外就可觀察庫(kù)內(nèi)的溫濕度數(shù)據(jù),減少了操作人員對(duì)保鮮系統(tǒng)內(nèi)部的干擾,方便操作人員觀察庫(kù)內(nèi)溫濕度數(shù)據(jù)。(4)保鮮庫(kù)系統(tǒng)運(yùn)行及保鮮品質(zhì)驗(yàn)證。將從沈陽(yáng)農(nóng)業(yè)大學(xué)寒富蘋果科研基地采摘的寒富蘋果,按照數(shù)值模擬的結(jié)果進(jìn)行合理擺放,并運(yùn)行無(wú)線溫濕度監(jiān)控系統(tǒng),進(jìn)行系統(tǒng)運(yùn)行效果測(cè)定試驗(yàn)和保鮮品質(zhì)試驗(yàn)。結(jié)果表明:與溫濕度記錄儀測(cè)得的溫濕度數(shù)據(jù)比較,無(wú)線溫濕度監(jiān)控系統(tǒng)下的溫濕度最大誤差分別為±0.2℃和0.4%,溫濕度能控制在要求的誤差范圍內(nèi),滿足實(shí)際儲(chǔ)藏要求;保鮮庫(kù)保鮮系統(tǒng)運(yùn)行10周后,寒富蘋果的平均失重率為1.9%,果皮和果肉色差分別增長(zhǎng)11%和8%,整體咀嚼性及果肉咀嚼性分別下降了18.59%和21.53%。說(shuō)明該保鮮庫(kù)系統(tǒng)長(zhǎng)期運(yùn)行狀態(tài)穩(wěn)定,寒富蘋果經(jīng)儲(chǔ)藏后,蘋果品質(zhì)較好。
[Abstract]:With the development of fruit and vegetable industry, the demand and quality of fruit and vegetable are increasing. The storage of fruits and vegetables is difficult to store and easy to rot, and the storage can effectively reduce the loss of fruits and vegetables during storage. In order to determine the best environmental conditions for preservation and storage of fruits and vegetables, and to keep the best quality of fruits and vegetables after storage, the contents of Shenyang's scientific and technological project, "Research and Development of movable automatic Control and Prediction Storage Storage of Cold Rich Apple", were introduced. In this paper, the numerical simulation and analysis of the actual storage storehouse are carried out, and the wireless temperature and humidity monitoring system suitable for the storage storehouse is designed, and the storage experiment is carried out with the cold rich apple as the object. The research contents and conclusions are as follows: (1) the preservation technology of the fruit and vegetable preservation storehouse. Numerical simulation technology and wireless monitoring system status analysis. Based on the analysis of the current situation of preservation technology in fruit and vegetable storage, the technology of numerical simulation and wireless monitoring system of temperature and humidity is studied, and the method of combining numerical simulation with wireless monitoring system of temperature and humidity is put forward. Improving the storage environment and improving the storage quality of fruits and vegetables. (2) structure design and numerical simulation analysis. On the basis of the structural design of the storage room, the velocity field of three different apple boxes in the storage room was simulated and analyzed, and the two-dimensional velocity vector diagram with different positions and different directions was obtained. The results showed that the arrangement of 5cm between the apple boxes was 3 cm, and the airflow distribution was uniform and there was a large backflow whirlpool in the storage, which was beneficial to the cooling of the storage. And it can effectively lose the heat produced by apple respiration in the apple box. (3) the design of wireless temperature and humidity monitoring system. The temperature and humidity monitoring system based on nRF24L01 wireless communication module is designed. The system includes monitoring control unit, data transmission unit and host computer monitoring unit. The software design adopts modular programming idea to realize the main program calling each module subroutine. Through the design of hardware system and the programming of software system, the wireless and accurate monitoring of temperature and humidity environment parameters can be realized. In addition to the main functions of temperature and humidity monitoring, we can also observe the temperature and humidity data in the storage outside the storehouse, thus reducing the interference of the operators to the preservation system. Convenient operators to observe the temperature and humidity data. (4) Storage system operation and quality verification. According to the results of numerical simulation, the apple picked from the scientific research base of Hanfu apple of Shenyang Agricultural University will be arranged reasonably, and the wireless temperature and humidity monitoring system will be run, and the system operation effect and fresh-keeping quality test will be carried out. The results show that compared with the temperature and humidity data measured by the temperature and humidity recorder, the maximum error of temperature and humidity under the wireless temperature and humidity monitoring system is 鹵0.2 鈩，

本文編號(hào)：2174947