本文選題：風(fēng)冷冷水機(jī)組 + 氣流組織�。� 參考：《長(zhǎng)沙理工大學(xué)》2014年碩士論文

【摘要】：近年來(lái),隨著高層高端建筑與大型城市綜合體的大量涌現(xiàn),中央空調(diào)系統(tǒng)的布置也變得更為復(fù)雜�？照{(diào)冷熱源和空調(diào)送風(fēng)系統(tǒng)是中央空調(diào)系統(tǒng)的重要組成部分,它們的合理設(shè)計(jì)與布置對(duì)空調(diào)系統(tǒng)的使用效果、室內(nèi)空氣品質(zhì)和節(jié)能有著重要的意義。然而,目前空調(diào)冷熱源和空調(diào)送風(fēng)系統(tǒng)的設(shè)計(jì)與布置普遍采用經(jīng)驗(yàn)的方法,造成空調(diào)冷熱源與空調(diào)送風(fēng)系統(tǒng)不能很好達(dá)到設(shè)計(jì)要求。本文首先對(duì)風(fēng)冷冷水機(jī)組群自然排風(fēng)情況下設(shè)備層內(nèi)氣流組織進(jìn)行了數(shù)值模擬,結(jié)果表明風(fēng)冷冷水機(jī)組設(shè)備層內(nèi)的氣流分布較紊亂,室外氣流不能順暢地進(jìn)入設(shè)備層,且風(fēng)冷機(jī)組的高溫排風(fēng)出現(xiàn)返混現(xiàn)象,嚴(yán)重地影響著風(fēng)冷冷水機(jī)組的換熱性能。其次,針對(duì)自然排風(fēng)情況下風(fēng)冷冷水機(jī)組設(shè)備層氣流組織的不足,提出采用“有組織排風(fēng)”的方法改進(jìn)設(shè)備層內(nèi)的氣流組織情況的優(yōu)化設(shè)計(jì)方案,并數(shù)值模擬了優(yōu)化方案下風(fēng)冷冷水機(jī)組設(shè)備層內(nèi)氣流組織分布,并比較了“有組織排風(fēng)”優(yōu)化方案與“自然排風(fēng)”方案,結(jié)果表明優(yōu)化方案下風(fēng)冷冷水機(jī)組設(shè)備層內(nèi)的氣流組織情況有所改善,風(fēng)冷冷水機(jī)組群的高溫排風(fēng)在排風(fēng)管和排風(fēng)箱的組織下順利排到室外,有效地阻止了高溫排風(fēng)的返混,同時(shí),室外的氣流也能夠順利地進(jìn)入設(shè)備層內(nèi),確保風(fēng)冷冷水機(jī)組能夠高效穩(wěn)定的運(yùn)行。最后,以辦公室標(biāo)準(zhǔn)層全空氣空調(diào)送風(fēng)系統(tǒng)為研究對(duì)象,對(duì)空調(diào)送風(fēng)管和末端的速度、壓力和出口流量進(jìn)行了數(shù)值模擬,模擬結(jié)果表明辦公室標(biāo)準(zhǔn)層變風(fēng)量全空氣空調(diào)系統(tǒng)的送風(fēng)系統(tǒng)設(shè)計(jì)較合理,送風(fēng)支管內(nèi)速度和壓力分布較均勻,末端各個(gè)風(fēng)口送風(fēng)量偏差較小。但通過對(duì)各末端設(shè)備所負(fù)責(zé)區(qū)域的出口送風(fēng)量和設(shè)計(jì)要求的送風(fēng)量比較分析,發(fā)現(xiàn)東西兩側(cè)的空調(diào)機(jī)組在末端設(shè)備風(fēng)閥全開的情況下各區(qū)域的送風(fēng)量均不能滿足設(shè)計(jì)要求。因此,建議空調(diào)系統(tǒng)實(shí)際運(yùn)行時(shí),減小送風(fēng)量偏大區(qū)域內(nèi)末端設(shè)備的閥門開度,確保各送風(fēng)口送風(fēng)量的均勻性。本文的研究結(jié)果對(duì)空調(diào)系統(tǒng)方案的優(yōu)化具有重要的指導(dǎo)意義,同時(shí)對(duì)其它同類大型建筑的空調(diào)系統(tǒng)設(shè)計(jì)具有借鑒意義。
[Abstract]:In recent years, with the emergence of high-rise high-end buildings and large-scale urban complexes, the layout of central air-conditioning systems has become more complex. Air conditioning cooling and heating sources and air supply system are important parts of central air conditioning system. Their reasonable design and arrangement are of great significance to the use effect of air conditioning system, indoor air quality and energy saving. However, at present, the design and arrangement of air conditioning cooling and heating sources and air supply systems of air conditioning generally adopt the method of experience, which results in the air conditioning cold and heat sources and air supply systems can not meet the design requirements well. In this paper, the airflow distribution in the equipment layer of air-cooled chillers is numerically simulated under the condition of natural exhaust air flow. The results show that the airflow distribution in the air-cooled chillers' equipment layer is more disordered, and the outdoor airflow can not enter the equipment layer smoothly. The backmixing of high temperature exhaust air of air-cooled chillers seriously affects the heat transfer performance of air-cooled chillers. Secondly, aiming at the shortage of airflow organization in the air cooled chiller under natural exhaust, the paper puts forward an optimized design scheme to improve the airflow distribution in the equipment layer by using the method of "organized exhaust air". The airflow distribution in the air cooled chiller layer under the optimized scheme is numerically simulated, and the optimization scheme of "organized exhaust air" and the "natural exhaust air" scheme are compared. The results show that the airflow organization in the equipment layer of air-cooled chillers has been improved, and the high-temperature exhaust air of air-cooled chillers has been successfully discharged outdoors under the organization of exhaust pipes and exhaust boxes, which effectively prevents the backmixing of high-temperature exhaust air. At the same time, the outdoor air flow can enter the equipment layer smoothly, to ensure the air-cooled chillers can run efficiently and stably. Finally, the velocity, pressure and outlet flow rate of the air supply duct and the end of the air conditioning system are numerically simulated, taking the air supply system of the standard layer of the office air conditioning system as the research object. The simulation results show that the design of the air supply system of the office standard layer VAV total air conditioning system is more reasonable, the velocity and pressure distribution in the air supply branch pipe is more uniform, and the deviation of the air supply volume at the end of each tuyere is relatively small. However, through the comparative analysis of the outlet air supply volume and the design requirement of each terminal equipment, it is found that the air supply volume of the air conditioning units on both sides of the east and west sides can not meet the design requirements under the condition that the air valves of the end equipment are all open. Therefore, it is suggested that the valve opening of the terminal equipment in the large air supply area should be reduced when the air conditioning system is in operation, so as to ensure the uniformity of the air supply volume of the air supply outlets. The results of this paper are of great significance to the optimization of air conditioning system scheme and to the design of other similar large buildings.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU83

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 郜義軍;韓宗偉;李先庭;石文星;;提高風(fēng)冷冷凝器換熱能力的措施[J];廣州大學(xué)學(xué)報(bào)(自然科學(xué)版);2011年04期

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本文編號(hào)：2040133