本文關(guān)鍵詞：改進(jìn)型誘導(dǎo)空調(diào)系統(tǒng)空調(diào)箱傳熱與冬季氣流組織研究　出處：《浙江理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 改進(jìn)型誘導(dǎo)空調(diào)系統(tǒng) 集約型空調(diào)箱 橢圓管翅片換熱器 綜合換熱性能 冬季室內(nèi)氣流組織 數(shù)值模擬

【摘要】：建筑能耗隨著城市化進(jìn)程的發(fā)展迅速增加,空調(diào)系統(tǒng)用能在建筑能耗中所占的比例最大,對于新型空調(diào)系統(tǒng)的研究日益受到人們的關(guān)注。本文針對一種改進(jìn)型誘導(dǎo)空調(diào)系統(tǒng),從節(jié)能性的角度探究了該系統(tǒng)空調(diào)箱內(nèi)橢圓管翅片換熱器的傳熱過程;從舒適性的角度分析了該系統(tǒng)末端改進(jìn)型誘導(dǎo)器冬季送風(fēng)室內(nèi)氣流組織的特征,為該系統(tǒng)的推廣及應(yīng)用提供理論基礎(chǔ)。改進(jìn)型誘導(dǎo)空調(diào)系統(tǒng)主要由三部分組成:中溫?zé)岜脵C(jī)組、集約型空調(diào)箱以及改進(jìn)型誘導(dǎo)器,該系統(tǒng)集成了大溫差供水送風(fēng)技術(shù)、橢圓管翅片換熱器高傳熱性能低阻力特點(diǎn)以及誘導(dǎo)器誘導(dǎo)送風(fēng)技術(shù),相比于常規(guī)的空調(diào)系統(tǒng)有明顯的節(jié)能優(yōu)勢。針對改進(jìn)型誘導(dǎo)空調(diào)系統(tǒng)的空氣處理機(jī)組——集約型空調(diào)箱,在合理簡化模型的基礎(chǔ)上,運(yùn)用CFD方法對位于空調(diào)箱內(nèi)部的橢圓管翅片換熱器傳熱過程進(jìn)行了數(shù)值模擬,并與同當(dāng)量直徑的圓管翅片換熱器進(jìn)行比較。研究分析了兩種結(jié)構(gòu)換熱器綜合換熱性能的差異、空氣側(cè)速度場與溫度場的分布特征。結(jié)果表明:橢圓管換熱器出口平均溫度高,尾部的渦流與高溫區(qū)域小,綜合換熱性能優(yōu)于圓管,運(yùn)用在空調(diào)箱中能夠減少阻力損失并增強(qiáng)換熱,進(jìn)而提高空調(diào)系統(tǒng)的整體效率。增加翅片間距可以提高換熱器的綜合換熱性能,但會增加機(jī)組的寬度;翅片厚度對于綜合換熱性能的影響存在一個最優(yōu)點(diǎn),合理地選擇翅片厚度可以使得換熱性能高的同時節(jié)省制造用材;管間距對于換熱性能的影響也存在一個最優(yōu)點(diǎn),在設(shè)計(jì)機(jī)組內(nèi)換熱器間距時,需考慮到最優(yōu)點(diǎn)的存在,保證綜合換熱性能高的同時減小機(jī)組的體積及占地面積。該研究為橢圓管在空調(diào)箱內(nèi)的運(yùn)行效果及性能優(yōu)化提供指導(dǎo)意見。采用Airpak軟件對改進(jìn)型誘導(dǎo)空調(diào)系統(tǒng)的末端誘導(dǎo)器冬季供暖室內(nèi)氣流組織進(jìn)行了模擬,并通過實(shí)驗(yàn)測量的方式驗(yàn)證了模擬的可靠性。研究表明:誘導(dǎo)器在冬季工況下的制熱效果不佳,適用性低。盡管室內(nèi)流場速度小,不會引起吹風(fēng)感,但室內(nèi)氣流組織呈現(xiàn)上部溫度高,下部溫度低,垂直方向溫差大的特征,影響了人體的舒適性。通過探究不同因素對氣流組織的影響,指出增加誘導(dǎo)器送風(fēng)溫度與送風(fēng)速度可以提高室內(nèi)人體活動區(qū)域的溫度;誘導(dǎo)器適用于冬季負(fù)荷小、高度低的房間。該研究為改進(jìn)型誘導(dǎo)空調(diào)系統(tǒng)冬季工況的供暖效果提供參考及改進(jìn)措施。
[Abstract]:Building energy consumption with the development of city urbanization increased rapidly and the air conditioning system can be used in building energy consumption accounts for the largest proportion, for the study of a new air conditioning system has attracted more and more attention. In this paper an improved induction air conditioning system, from the perspective of energy saving air conditioning box elliptic tube heat exchanger heat transfer the process of the system; features from the comfort of the system is improved by the end of winter air indoor air flow organization, to provide the theoretical basis for the popularization and application of the system. The improved induction air conditioning system is mainly composed of three parts: the temperature of heat pump units, intensive air box and improved induction device the system is integrated with large temperature difference water supply technology, elliptical tube fin heat exchanger with high heat transfer performance and low resistance characteristics and inducer induced wind feeding technology, compared to the conventional air-conditioning system is Such significant advantage. For improved induction air conditioning system air handling units - intensive air conditioning box, based on the simplified model, using CFD method for heat transfer process of heat exchanger is simulated in air conditioning box inside the elliptical finned tube, fin and tube diameter and equivalent heat exchanger comparative analysis of two kinds of structure of heat exchanger between the heat transfer performance, the distribution characteristics of velocity field and temperature field of air side. The results show that the elliptic tube heat exchanger outlet average temperature is high, and the high temperature region of small tail vortex, the comprehensive heat transfer performance is better than that of the round tube, can reduce the resistance loss and use enhanced heat transfer in air conditioning box, thus improving the overall efficiency of the air conditioning system. Increasing fin spacing can improve the comprehensive performance of heat exchanger, but will increase the unit width; the fin thickness for the comprehensive heat transfer performance Influence of one of the most advantages of reasonable selection of fin thickness can make the change and thermal performance of high saving manufacturing materials; tube spacing is a most advantages for the effect on the heat transfer performance of the heat exchanger in the design unit in space, need to consider the advantages of existence, to ensure the overall heat transfer performance of high at the same time reduce the unit volume and area. The study provides guidance on the operation effect of the air conditioning cabinet and performance optimization is improved. At the end of the elliptic tube induction air conditioning system for induction heating in winter indoor air distribution is simulated using the Airpak software, and the reliability of the simulation was verified by experimental measurement. Research shows that: the heating effect is induced under winter condition is poor. Although the applicability of low velocity small indoor, will not cause the sense of hair, but the indoor airflow showed the upper temperature high, lower temperature Low temperature characteristics in vertical direction, the effect of human comfort. By exploring the effects of different factors on the airflow, pointed out that the increase is induced by the temperature and velocity of air supply can improve the indoor human activity area is suitable for winter temperature; induced load small, high low degree. This study provided the reference room and the improvement measures for improved induction air conditioning system of the heating effect in winter conditions.

【學(xué)位授予單位】：浙江理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU831

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