發(fā)布時(shí)間：2019-06-25 16:24

【摘要】：微通道換熱器是一種借助特殊微加工技術(shù)以固體基質(zhì)制造的可用于進(jìn)行熱傳遞的三維結(jié)構(gòu)單元。當(dāng)前關(guān)于微通道換熱器的確切定義,比較通行、直觀的分類是由Mehen-dale.s.s提出的按其水力當(dāng)量直徑的尺寸來劃分。通常將水力當(dāng)量直徑小于l mm的換熱器稱為微通道換熱器。本論文在ANSYS仿真的基礎(chǔ)上,通過對(duì)已有產(chǎn)品進(jìn)行建模,首先對(duì)單根管與傳統(tǒng)大管徑進(jìn)行溫度場(chǎng)與流場(chǎng)的模擬對(duì)比,準(zhǔn)確找出微通道換熱器在換熱方面的優(yōu)勢(shì),再分別對(duì)微通道單根管、三根管、雙排六根管的情況進(jìn)行溫度場(chǎng)以及流場(chǎng)模擬,分析管與管排列方式對(duì)對(duì)流換熱的影響,最后結(jié)合已有試驗(yàn)裝置進(jìn)行試驗(yàn)驗(yàn)證。結(jié)果顯示:冷凝器對(duì)流換熱系數(shù)試驗(yàn)與模擬的結(jié)果始終保持在20%的誤差以內(nèi),而蒸發(fā)器的對(duì)流換熱系數(shù)試驗(yàn)與模擬的結(jié)果由于受到冷凝水這部分熱阻的影響,誤差控制在30%以內(nèi),由上可以得出模擬結(jié)果具有一定的參考價(jià)值。對(duì)微通道換熱器進(jìn)行變工況分析,通過選擇不同冷凝風(fēng)機(jī)風(fēng)量模擬出微通道的對(duì)流換熱系數(shù),通過計(jì)算得出COP峰值,找出最佳狀態(tài)點(diǎn),并將其定為最佳工作狀態(tài)點(diǎn)。通過以上的分析計(jì)算得出結(jié)論:COP最大值點(diǎn)取值為7.4785,根據(jù)風(fēng)機(jī)電機(jī)輸入功率計(jì)算式反推得出,當(dāng)迎面風(fēng)速為3.39m/s時(shí),此時(shí)制冷系統(tǒng)的COP達(dá)到一個(gè)峰值。最后,分別選取該微通道換熱器與傳統(tǒng)換熱器做兩器進(jìn)行系統(tǒng)性能試驗(yàn)可以得出:在總體積方面,微通道換熱器室內(nèi)機(jī)和室外機(jī)占用體積相比傳統(tǒng)換熱器(帶翅片)分別減少了97.5%和98.7%,而就銅管所消耗的體積來講,微通道換熱器相比傳統(tǒng)換熱器蒸發(fā)器和冷凝器分別減小55.8%和23.9%,從經(jīng)濟(jì)角度出發(fā),蒸發(fā)器和冷凝器經(jīng)濟(jì)花費(fèi)分別減少了23.22元和19.44元。由此可見,該微通道換熱器在工程應(yīng)用中經(jīng)濟(jì)效益與體積優(yōu)勢(shì)明顯。
[Abstract]:The microchannel heat exchanger is a three-dimensional structural unit that can be used for heat transfer in a solid matrix by means of special micromachining techniques. The exact definition of the microchannel heat exchanger is currently more accessible and the visual classification is divided by the size of its hydraulic equivalent diameter as proposed by Mehen-dale. s. s. A heat exchanger having a hydraulic equivalent diameter of less than l mm is commonly referred to as a microchannel heat exchanger. On the basis of the ANSYS simulation, by modeling the existing products, the simulation and comparison of the temperature field and the flow field of the single pipe and the traditional large pipe diameter are compared, the advantages of the micro-channel heat exchanger in the heat exchange are accurately found, and the single pipe and the three pipes of the micro-channel are respectively used for the micro-channel heat exchanger, The temperature field and the flow field simulation are carried out in the case of the two rows of six tubes, and the effect of the tube and tube arrangement on the convection heat transfer is analyzed. Finally, the experimental verification is carried out in combination with the existing test device. The results show that the results of the experiment and simulation of the convection heat transfer coefficient of the condenser are always within 20% of the error, and the experimental and simulation results of the convection heat transfer coefficient of the evaporator are within 30% due to the influence of the thermal resistance of the condensed water. It can be concluded that the simulation results have a certain reference value. The variable working condition of the microchannel heat exchanger is analyzed, and the convection heat transfer coefficient of the microchannel is simulated by selecting the air volume of different condensing fans, and the COP peak value is calculated, the optimal state point is found, and the optimal working state point is determined. Through the above analysis, it is concluded that the maximum value of COP is 7.4785. According to the calculation formula of the input power of the fan motor, the COP of the refrigeration system reaches a peak when the head-on wind speed is 3.39 m/ s. in that end, the system performance test of the micro-channel heat exchanger and the conventional heat exchanger is respectively selected to obtain the conclusion that, in terms of the total volume, the occupied volume of the micro-channel heat exchanger indoor machine and the outdoor unit is reduced by 97.5% and 98.7%, respectively, compared with the occupied volume of the outdoor unit, In terms of the volume consumed by the copper tube, the micro-channel heat exchanger is 55.8% and 23.9%, respectively, compared with the traditional heat exchanger evaporator and the condenser, and the economic cost of the evaporator and the condenser is reduced by 23.22 and 19.44 yuan respectively from the economic point of view. It can be seen that the micro-channel heat exchanger has obvious economic benefit and volume advantage in the engineering application.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TK172

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