本文選題：中低溫工況 + 風(fēng)機盤管��； 參考：《天津商業(yè)大學(xué)》2016年碩士論文

【摘要】：食品保鮮行業(yè)的發(fā)展使高溫食品的冷藏環(huán)境得到廣泛應(yīng)用,一般來說,各種農(nóng)產(chǎn)品(瓜、果、蔬菜等)適宜的儲存環(huán)境要求在8-20℃。優(yōu)化和提高冷藏環(huán)境室的設(shè)備性能,對高溫冷藏環(huán)境室的節(jié)能運行意義重大。在實際高溫冷藏室中,人員頻繁作業(yè),直接將制冷劑的末端設(shè)備(如冷風(fēng)機)與人員操作空間相連接,制冷劑充注量大,勢必對人員安全性造成威脅。如果采用載冷劑系統(tǒng)則可以克服上述缺點,減少制冷劑充注量大并避免安全隱患。風(fēng)機盤管是空調(diào)系統(tǒng)中常見的載冷劑換熱設(shè)備,具有價格低廉等優(yōu)勢,如果將風(fēng)機盤管應(yīng)用于高溫冷藏室,勢必會拓展風(fēng)機盤管的使用范圍,同時也解決了高溫冷藏室末端設(shè)備短缺問題。與空調(diào)系統(tǒng)不同,在高溫冷藏環(huán)境室中應(yīng)用的風(fēng)機盤管工作在偏離風(fēng)機盤管標準工況的中低溫工況下。因此,本文將重點研究中低溫工況下風(fēng)機盤管的供冷能力,傳熱性能以及析濕系數(shù)的變化情況,開展高溫冷藏環(huán)境室采用風(fēng)機盤管的理論分析和實驗研究。通過研究干濕工況下風(fēng)機盤管對室內(nèi)空氣的熱濕處理過程,建立中低溫工況下風(fēng)機盤管變工況的數(shù)學(xué)模型,搭建中低溫工況下風(fēng)機盤管系統(tǒng)實驗臺,通過改變載冷劑進口溫度、載冷劑流量和環(huán)境室溫度,對風(fēng)機盤管的供冷能力、焓效率、換熱溫差以及析濕系數(shù)的變化情況進行研究,掌握風(fēng)機盤管在中低溫工況下運行時的性能。研究結(jié)果表明：風(fēng)機盤管的供冷量隨載冷劑進口溫度的變化規(guī)律基本上呈線性關(guān)系,與標準工況相比,室溫18℃供冷量約為標準工況的47.8%-8.7%；室溫15℃供冷量約為標準工況的41.2%-15.9%；室溫12℃供冷量約為標準工況的32.8%-11.9%；維持環(huán)境室溫度、載冷劑流量以及風(fēng)量不變時,載冷劑進口溫度每上升1℃,供冷量約降低5%；維持載冷劑進口溫度,流量以及風(fēng)量不變時,環(huán)境室溫度為18℃、15℃、12℃,室溫每降低3℃時,供冷量依次降低12.9%、9.41%,說明室溫較高的情況下,對供冷量的影響更大；風(fēng)機盤管的焓效率與載冷劑進出口溫度,進出口風(fēng)溫?zé)o關(guān),只與載冷劑流速以及風(fēng)量有關(guān),用焓效率法計算供冷量與實驗值相差在10%之內(nèi),計算結(jié)果精度很高,推薦推廣使用；中低溫環(huán)境室冷風(fēng)比需在2.2-3.5之間,宜選用的載冷劑進口溫度推薦值為：環(huán)境室溫度為12℃時,進口載冷劑溫度為4℃及以下；環(huán)境室溫度為15℃時,載冷劑進口溫度應(yīng)選擇在4℃-7℃；環(huán)境室溫度為18℃時,載冷劑進口溫度應(yīng)選擇在5℃-9℃總體來看,載冷劑進口溫度與流量對風(fēng)機盤管影響很大,為了工程設(shè)計選型方便,根據(jù)實驗測試結(jié)果,擬合出偏離標準工況下的供冷量、進出口溫差、傳熱溫差、全冷量焓效率、顯冷量焓效率、析濕系數(shù)等的性能回歸方程的適用公式：供冷量：載冷劑進出口溫差：傳熱溫差：△tm=0.0511t2.3649twl-1.2496qv-0.1849,相關(guān)系數(shù)為0.90以上全冷量焓效率：εh=1.632Vy0.5191qm0.6114、顯冷量焓效率：εs=1.208Vy0.135qm0.5951,相關(guān)系數(shù)在0.95以上析濕系數(shù)：ξ=0.7450t-0.3712twl0.5913qv0.1160,相關(guān)系數(shù)在0.85以上。
[Abstract]:The development of food preservation industry makes the cold storage environment of high temperature food widely used. Generally, the suitable storage environment of various agricultural products (melon, fruit, vegetable and so on) is required at 8-20. The optimization and improvement of the equipment performance of the refrigerated environment room is of great significance to the energy saving operation of the high temperature refrigerated environment room. The end equipment of the refrigerant (such as the cold fan) is connected directly with the operating space of the personnel, and the refrigerant is filled with large amount, which will threaten the safety of the personnel. If the refrigerant system is used, the disadvantages can be overcome, the refrigerant charge is greatly reduced and the hidden danger is avoided. The fan coil is the common refrigerant exchange in the air conditioning system. The heat equipment has the advantages of low price and so on. If the fan coil is applied to the high temperature cold storage room, it will expand the use range of the fan coil and solve the problem of the terminal equipment shortage in the high temperature cold storage room. The fan coil work in the high temperature refrigerated environment room is different from the standard condition of the fan coil unit. Under the condition of medium and low temperature, this paper will focus on the cooling capacity, heat transfer performance and the change of the humidity coefficient of the fan coil in the low temperature condition, and carry out the theoretical analysis and experimental study of the fan coil in the high temperature refrigerated environment room. In the middle and low temperature conditions, the mathematical model of the fan coil unit is set up, and the experimental platform of the fan coil system is set up in the middle and low temperature conditions. By changing the inlet temperature of the refrigerant, the flow of the refrigerant and the temperature of the environment, the cooling capacity of the fan coil, the enthalpy efficiency, the heat transfer temperature difference and the change of the number of the dehumidification system are studied. The results show that the cooling capacity of the fan coil is basically linear with the changing law of the inlet temperature of the refrigerant. Compared with the standard condition, the cooling capacity at room temperature is about 47.8%-8.7% of the standard working condition at 18 C, the cooling capacity at room temperature is about 41.2%-15.9% of the standard condition, and the cooling capacity at room temperature is about 12. For 32.8%-11.9% of standard operating conditions, when the temperature of the environment, the flow of refrigerant and the air volume are constant, the inlet temperature of the refrigerant is increased by 1 degrees centigrade, and the cooling capacity is reduced by about 5%. When the inlet temperature of the refrigerant, the flow and the volume of the air are kept constant, the temperature of the environment room is 18, 15, 12, and the room temperature decreases by 3 degrees centigrade, and the cooling capacity is reduced by 12.9%, 9.41% in turn. The enthalpy efficiency of the fan coil is not related to the inlet and exit temperature of the refrigerant and the inlet and outlet temperature. The enthalpy efficiency of the fan coil is only related to the flow rate and the air volume of the refrigerant. The enthalpy efficiency method is used to calculate the difference between the cooling capacity and the experimental value of 10%, and the precision of the result is very high and the low temperature environment is recommended. The recommended value of the inlet temperature of the refrigerant for the room cold air is compared with the 2.2-3.5. The inlet temperature of the imported refrigerant is 4 centigrade when the environment room temperature is 12 C, and the inlet temperature of the refrigerant should be selected at 4 C at the temperature of 15 C at the temperature of 4 C, and the inlet temperature of the refrigerant should be selected at 5 C -9 C when the environment room temperature is 18. To see, the inlet temperature and flow rate of the refrigerant have great influence on the fan coil. For the convenience of the design of the engineering design, according to the experimental test results, the applicable formula for the performance regression equation of the cooling capacity, the temperature difference of the import and export, the heat transfer temperature, the total cooling enthalpy efficiency, the sensible cooling enthalpy efficiency, the number of dehumidification system, and so on, is fitted out. The temperature difference of the inlet and outlet of the refrigerant: the heat transfer temperature difference: Delta tm=0.0511t2.3649twl-1.2496qv-0.1849, the correlation coefficient is above 0.90 total cooling enthalpy efficiency: epsilon h=1.632Vy0.5191qm0.6114, the apparent cooling enthalpy efficiency: epsilon s=1.208Vy0.135qm0.5951, the correlation coefficient is above 0.95, the coefficient of wetting coefficient is = 0.7450t-0.3712twl0.5913qv0.1160, and the correlation coefficient is above 0.85.

【學(xué)位授予單位】：天津商業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TB657.2

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