【摘要】：目前我國正在經(jīng)歷快速的社會經(jīng)濟轉(zhuǎn)型,快速發(fā)展的同時也伴隨著能源的巨大消耗,節(jié)能節(jié)水已成為解決當(dāng)今能源問題的重要途徑,蒸發(fā)式冷凝器作為空調(diào)系統(tǒng)中的重要設(shè)備,其本身存在減少能耗、節(jié)約水資源效果明顯的特點,基于以上原因,本文對蒸發(fā)式冷凝器進(jìn)行研究分析與結(jié)構(gòu)優(yōu)化,采用水平布置蛇形盤管的蒸發(fā)式冷凝器,對機組性能進(jìn)行深入研究分析,主要研究內(nèi)容如下:根據(jù)計算流體動力學(xué)(Computational Fluid Dynamics)中關(guān)于氣-液兩相流的處理方法,采用混合模型(Mixture)多相流模型,為了準(zhǔn)確分析數(shù)值模擬水平布置的蒸發(fā)式冷凝器腔內(nèi)流場變化情況,建立了水平布置蒸發(fā)式冷凝器三維數(shù)學(xué)模型,并分析蒸發(fā)式冷凝器分別在氣相和氣-液兩相時三種不同進(jìn)風(fēng)方式(單面進(jìn)風(fēng)、兩面進(jìn)風(fēng)、側(cè)面進(jìn)風(fēng))對蒸發(fā)式冷凝器內(nèi)部流場的影響,結(jié)果表明:單面進(jìn)風(fēng)遠(yuǎn)離進(jìn)風(fēng)口側(cè)速度在整個區(qū)域較低,此處在拐角處形成渦流,不利于此區(qū)域的的換熱,與單相進(jìn)風(fēng)相比,兩面進(jìn)風(fēng)方式在氣流長度方向上較為對稱,能夠減少管壁和壁面處漩渦的數(shù)量與強度,側(cè)面進(jìn)風(fēng)整體氣流較均勻,但進(jìn)風(fēng)口側(cè)由于風(fēng)速過大,造成液相分布不均,為此進(jìn)行了結(jié)構(gòu)優(yōu)化,并進(jìn)行實驗研究。詳細(xì)的介紹了水平布置蒸發(fā)式冷凝器制冷系統(tǒng)的實驗裝置,該實驗裝置主要為蒸發(fā)式冷凝器制冷系統(tǒng)模擬的驗證提供實驗依據(jù),并為換熱器的性能和結(jié)構(gòu)優(yōu)化進(jìn)行實驗研究。在實驗中,研究不同進(jìn)風(fēng)方式和濕球溫度對水平布置蒸發(fā)式冷凝器機組性能的影響,由實驗結(jié)果分析出側(cè)進(jìn)風(fēng)方式機組的冷凝溫度更低,壓縮機功率消耗更少,這跟模擬分析結(jié)果相吻合,隨后針對實驗和模擬的結(jié)果(液相分布不均的問題)對機組進(jìn)行結(jié)構(gòu)優(yōu)化和性能分析,對水平布置的蛇形盤管安裝不同方式的換熱筋板,并測試了冷卻水噴淋密度、室外空氣干(濕)球溫度、空氣流速及換熱面積等參數(shù)對水平布置蒸發(fā)式冷凝的強化傳熱性能及制冷系統(tǒng)的制冷性能的影響。本課題通過對水平布置蒸發(fā)式冷凝器進(jìn)行數(shù)值模擬和實驗研究,并進(jìn)行有效的結(jié)構(gòu)優(yōu)化,豐富了蒸發(fā)式冷凝器的理論與應(yīng)用研究體系,為進(jìn)一步研究蒸發(fā)式冷凝器性能研究和結(jié)構(gòu)優(yōu)化提供了參考。
[Abstract]:At present, China is experiencing a rapid social and economic transformation, rapid development accompanied by huge energy consumption, energy saving and water saving has become an important way to solve the energy problem. As an important equipment in air conditioning system, evaporative condenser has its own characteristics of reducing energy consumption and saving water resources. In this paper, the evaporative condenser is analyzed and optimized, and the performance of the unit is analyzed by using the evaporative condenser with serpentine coils arranged horizontally. The main research contents are as follows: According to the treatment method of gas-liquid two-phase flow in Computational Fluid Dynamics, mixing is adopted. Mixture multiphase flow model. In order to accurately analyze and simulate the flow field in the chamber of evaporative condenser with horizontal arrangement, a three-dimensional mathematical model of evaporative condenser with horizontal arrangement was established. Three different air inlet modes (one-side air inlet, two-side air inlet and side air inlet) were analyzed when the evaporative condenser was in gas phase and gas-liquid phase respectively. The influence of wind on the flow field in the evaporative condenser is studied. The results show that the velocity at the inlet side of the single-side air inlet is lower than that at the inlet side in the whole region, and the vortex is formed at the corner, which is not conducive to the heat transfer in this region. The quantity and intensity of the air flow in the side air inlet are uniform, but the liquid phase distribution is uneven because of the excessive air velocity at the side of the air inlet. The structure optimization is carried out and the experimental study is carried out. The experimental device of the evaporative condenser refrigeration system with horizontal arrangement is introduced in detail. The experimental device is mainly the simulation experiment of the evaporative condenser refrigeration system. In the experiment, the influence of different air inlet modes and wet bulb temperatures on the performance of evaporative condenser units with horizontal arrangement is studied. The experimental results show that the side air inlet mode has lower condensing temperature and lower compressor power consumption, which is compared with the simulation. The analysis results are consistent. Then the structure optimization and performance analysis of the unit are carried out according to the experimental and simulation results (the problem of uneven liquid distribution). Different heat exchanger ribs are installed on the serpentine coils arranged horizontally. The spray density of cooling water, the dry (wet) bulb temperature of outdoor air, the air velocity and the heat exchange area are tested. The heat transfer enhancement and refrigeration performance of evaporative condenser with horizontal arrangement are studied by numerical simulation and experiment, and the effective structure optimization is carried out, which enriches the theoretical and applied research system of evaporative condenser and further studies the performance of evaporative condenser. It provides a reference for research and structural optimization.
【學(xué)位授予單位】：南京師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB657

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本文編號：2251008