本文選題：人字形微翅片管 + 漣漪紋管��； 參考：《浙江大學(xué)》2016年博士論文

【摘要】：在過去的幾十年里,強化傳熱技術(shù)有了很大的發(fā)展。強化傳熱技術(shù),能夠提高換熱設(shè)備的效率,減小重量和體積。不過隨著工業(yè)不斷的發(fā)展,對于傳熱技術(shù)的要求也越來越高,需要對強化傳熱技術(shù)進行更多的研究。另外,隨著人們對于環(huán)境問題越來越多的關(guān)注,尋找新一代制冷工質(zhì)來替代有溫室效應(yīng)的制冷劑,也迫在眉睫。本文對光管、人字形微翅片管和漣漪紋管三種銅管進行了實驗研究,銅管的外徑是12.7mm,內(nèi)徑是11.43mm,實驗測量的單管長度是1.9m,換熱工質(zhì)采用R22,R410A和R32三種不同制冷劑。單相實驗采用R22為換熱工質(zhì),制冷劑的飽和溫度為49℃,制冷劑質(zhì)量流速為130-246.8kg/(m2s),熱流量為6.43-14.9kW/m2。實驗結(jié)果表明,光管的單相換熱系數(shù)最低。人字形微翅片管的單相換熱系數(shù)明顯高于光管,為光管的1.16-1.35倍。漣漪紋管的單相換熱系數(shù)最高,是光管的1.75-1.95倍。光管的單相換熱系數(shù)明顯比Gnielinski關(guān)聯(lián)式的預(yù)測值要高出很多,是關(guān)聯(lián)式預(yù)測值的1.24-1.31倍。光管內(nèi)的單相壓降最低,人字形微翅片管的壓降比光管要大,隨著雷諾數(shù)的增大,人字形微翅片管與光管的壓降趨于接近。漣漪紋管的壓降最高,是光管的2.14-2.70倍。漣漪紋管的綜合性能因子是1.34-1.40,說明漣漪紋管的綜合性能是很好的,人字形微翅片管的綜合性能因子是0.91-1.37。冷凝實驗采用R22,R410A和R32為換熱工質(zhì),質(zhì)量流速為56.2-178.5kg/(m2s),熱流密度為9.9-30.4kW/m2。其中R22和R410A的冷凝飽和溫度為47℃,進出口干度分別是0.8和0.2；R32的冷凝飽和溫度為45℃,進出口干度分別是0.8和0.1。光管的冷凝換熱系數(shù)最低,人字形微翅片管的冷凝換熱系數(shù)最高,大約是光管的2.3-3.2倍。漣漪紋管的冷凝換熱系數(shù)大約是光管的1.3-2.0倍。采用光管內(nèi)冷凝換熱關(guān)聯(lián)式對光管實驗結(jié)果進行對比,關(guān)聯(lián)式分別采用：Haraguchi關(guān)聯(lián)式,Shah關(guān)聯(lián)式,Dobson和Chato關(guān)聯(lián)式和Cavallini關(guān)聯(lián)式。對人字形微翅片管內(nèi)冷凝換熱系數(shù)也和關(guān)聯(lián)式進行對比,關(guān)聯(lián)式采用：Kedzierski和Goncalves關(guān)聯(lián)式,Cavallini關(guān)聯(lián)式和Olivier關(guān)聯(lián)式。并且對三種制冷劑的換熱系數(shù)進行對比,分析不同制冷劑的換熱效果。蒸發(fā)換熱實驗采用了三種不同的制冷劑,分別是R22,R410A以及R32,制冷劑的蒸發(fā)飽和溫度選取6℃。其中,制冷劑R22和R410A的進出口干度分別是0.1和0.9,制冷劑R32的進出口干度分別是0.1和0.8。制冷劑的質(zhì)量流速為53.1-140.9kg/(m2s),熱流密度為13.9-36kW/m2。光管內(nèi)蒸發(fā)換熱系數(shù)是最低的。漣漪紋管的蒸發(fā)換熱系數(shù)是最高的,人字形微翅片管的蒸發(fā)換熱系數(shù)介于光管和漣漪紋管之間。采用Wojtan提出的流型分析方法對蒸發(fā)過程的流型進行分析,發(fā)現(xiàn)蒸發(fā)實驗過程處于彈狀流+分層流/波狀流和分層流/波狀流區(qū)域,并沒有達到環(huán)形流的狀態(tài)。另外對光管內(nèi)的蒸發(fā)換熱系數(shù)采用修正的Wojtan關(guān)聯(lián)式和Liu關(guān)聯(lián)式進行對比。人字形微翅片管和漣漪紋管的氣液兩相壓降采用R22為工質(zhì),進出口平均干度是0.55。人字形微翅片管的壓力損失比光管的理論值要高很多,漣漪紋管的兩相壓降最高。人字形微翅片管的壓降和關(guān)聯(lián)式的吻合程度很高。
[Abstract]:In the past few decades, the enhancement of heat transfer technology has developed greatly. The enhancement of heat transfer technology can improve the efficiency of heat transfer equipment and reduce the weight and volume. However, with the continuous development of industry, the demand for heat transfer technology is becoming more and more high. More research on heat transfer technology is needed. In addition, with the environment of people The problem is more and more concerned. It is also imminent to find a new refrigerant to replace the refrigerant with the greenhouse effect. In this paper, three kinds of copper tubes, such as light tube, human shaped micro fin tube and ripple tube, are studied experimentally. The outer diameter of the copper tube is 12.7mm, the diameter of the tube is 11.43mm, the length of the single tube is 1.9m, the heat exchanger uses R22, R410A And R32 three different refrigerants. The single-phase experiment uses R22 as the heat exchanger, the saturation temperature of the refrigerant is 49 C, the mass velocity of the refrigerant is 130-246.8kg/ (M2S). The heat flux is 6.43-14.9kW/m2. experimental results show that the single-phase heat transfer coefficient of the tube is the lowest. The single-phase heat transfer coefficient of the human shaped micro fin tube is obviously higher than that of the light tube, which is the 1.16-1 of the light tube. .35 times. The single-phase heat transfer coefficient of ripple tube is the highest, which is the 1.75-1.95 times of the light tube. The single-phase heat transfer coefficient of the light tube is much higher than that of the Gnielinski correlation formula. It is the 1.24-1.31 times of the correlation prediction value. The single-phase pressure drop in the tube is the lowest, the pressure drop of the human shaped micro fin tube is larger than the light tube, and with the increase of the Reynolds number The pressure drop of the shaped micro fin tube is close to that of the light tube. The pressure drop of the ripple tube is the highest and the 2.14-2.70 times of the light tube. The comprehensive performance factor of the ripple tube is 1.34-1.40, which indicates that the comprehensive performance of the ripple tube is good. The comprehensive performance factor of the human shaped micro fin tube is that the 0.91-1.37. condensation experiment uses R22, R410A and R32 as the heat exchanger. The mass flow rate is 56.2-178.5kg/ (M2S), and the heat flux density is 9.9-30.4kW/m2., and the condensation saturation temperature of R22 and R410A is 47, 0.8 and 0.2, respectively. The condensation saturation temperature of R32 is 45, the dry degree is 0.8 and the 0.1. tube has the lowest condensation heat transfer coefficient, and the condensation heat transfer coefficient of the human shaped micro fin tube is the highest. It is about 2.3-3.2 times of the light tube. The condensation heat transfer coefficient of ripple tube is about 1.3-2.0 times of the light tube. The correlation formula of the light tube is compared with the condensation heat transfer correlation in the light tube. The correlation formula is used for the Haraguchi correlation, the Shah correlation, the Dobson and Chato correlation and the Cavallini correlation. The condensation heat transfer in the tube of the human shaped micro fin tube is used. The correlation formula is also compared with the correlation formula: Kedzierski and Goncalves correlation, Cavallini correlation and Olivier correlation. And the heat transfer coefficient of the three refrigerants is compared and the heat transfer effect of different refrigerants is analyzed. The evaporation heat transfer experiment uses three different refrigerants, R22, R410A and R32, respectively. The evaporation saturation temperature of the agent is 6 degrees centigrade, of which the dryness of the refrigerant R22 and R410A is 0.1 and 0.9 respectively. The mass flow rate of the refrigerant R32 is 0.1 and the 0.8. refrigerant is 53.1-140.9kg/ (M2S). The heat flux is the lowest in the 13.9-36kW/m2. tube, and the evaporation heat transfer coefficient of the ripple tube is the evaporation heat transfer coefficient is the lowest. The evaporation heat transfer coefficient of the human shaped micro fin tube is between the light tube and the ripple tube. The flow pattern analysis method proposed by Wojtan is used to analyze the flow pattern of the evaporation process. It is found that the evaporation experiment process is in the elastic flow + stratified flow / wave flow and the stratified flow / wave flow region, and does not reach the state of the annular flow. In addition, the light tube is not reached. The internal evaporation heat transfer coefficient is compared with the modified Wojtan correlation and Liu correlation. The gas liquid two phase pressure drop of the human shaped micro fin tube and ripple tube adopts R22 as the working medium. The average dry degree of the import and export is the pressure loss of the 0.55. shaped micro fin tube higher than that of the light tube, and the two phase pressure drop of the ripple tube is the highest. The pressure drop of the finned fin tube is highly consistent with the correlation.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：TK124

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