改进型诱导空调系统空调箱传热与冬季气流组织研究

发布时间：2018-01-08 10:15

本文关键词：改进型诱导空调系统空调箱传热与冬季气流组织研究　出处：《浙江理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：建筑能耗随着城市化进程的发展迅速增加,空调系统用能在建筑能耗中所占的比例最大,对于新型空调系统的研究日益受到人们的关注。本文针对一种改进型诱导空调系统,从节能性的角度探究了该系统空调箱内椭圆管翅片换热器的传热过程;从舒适性的角度分析了该系统末端改进型诱导器冬季送风室内气流组织的特征,为该系统的推广及应用提供理论基础。改进型诱导空调系统主要由三部分组成:中温热泵机组、集约型空调箱以及改进型诱导器,该系统集成了大温差供水送风技术、椭圆管翅片换热器高传热性能低阻力特点以及诱导器诱导送风技术,相比于常规的空调系统有明显的节能优势。针对改进型诱导空调系统的空气处理机组——集约型空调箱,在合理简化模型的基础上,运用CFD方法对位于空调箱内部的椭圆管翅片换热器传热过程进行了数值模拟,并与同当量直径的圆管翅片换热器进行比较。研究分析了两种结构换热器综合换热性能的差异、空气侧速度场与温度场的分布特征。结果表明:椭圆管换热器出口平均温度高,尾部的涡流与高温区域小,综合换热性能优于圆管,运用在空调箱中能够减少阻力损失并增强换热,进而提高空调系统的整体效率。增加翅片间距可以提高换热器的综合换热性能,但会增加机组的宽度;翅片厚度对于综合换热性能的影响存在一个最优点,合理地选择翅片厚度可以使得换热性能高的同时节省制造用材;管间距对于换热性能的影响也存在一个最优点,在设计机组内换热器间距时,需考虑到最优点的存在,保证综合换热性能高的同时减小机组的体积及占地面积。该研究为椭圆管在空调箱内的运行效果及性能优化提供指导意见。采用Airpak软件对改进型诱导空调系统的末端诱导器冬季供暖室内气流组织进行了模拟,并通过实验测量的方式验证了模拟的可靠性。研究表明:诱导器在冬季工况下的制热效果不佳,适用性低。尽管室内流场速度小,不会引起吹风感,但室内气流组织呈现上部温度高,下部温度低,垂直方向温差大的特征,影响了人体的舒适性。通过探究不同因素对气流组织的影响,指出增加诱导器送风温度与送风速度可以提高室内人体活动区域的温度;诱导器适用于冬季负荷小、高度低的房间。该研究为改进型诱导空调系统冬季工况的供暖效果提供参考及改进措施。
[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.

【学位授予单位】：浙江理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU831

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