小管径风机盘管传热与流阻及噪声特性研究

发布时间：2019-04-13 19:58

【摘要】：风机盘管是中央空调末端产品系列中相对比较成熟的产品之一,随着市场竞争日趋激烈,其成本日渐成为市场关注的重点。管翅式换热器成本占到整机的25%~45%,成为成本降低的瓶颈与突破点。随着技术的发展,小管径化为风机盘管机组成本降低提供了重要机会。当前风机盘管机组主流是采用9.52mm铜管,在保持性能相当的同时,如能采用7mm小管径,将为生产厂家赢得先机。本文对风机盘管管翅式换热器的管径优化设计进行了传热与阻力模拟计算,分析采用7mm小管径替换9.52mm铜管的可行性。通过理论计算分析,得出以下结论:采用7mm小管径管翅式换热器的换热面积与原9.52mm管径机组相当,其全热量、显热量、水压降、风压降的理论计算值均满足实际工程需求,其风压降下降了28%,有利于减少电机能耗。因此从理论计算的全热量、显热量、风压降、水压降等参数上来说,采用小管径7mm是可行的。根据理论模拟计算分析结果,制造了相应的机组进行验证测试,测试结果表明:优化后的机组全热量为优化前机组全热量的98.8%~105.8%;显热量为优化前机组显热量的97.7%~103.2%;风压降测试与计算值基本一致,电机能耗将会减少;机组水压降满足工程应用中盘管水压降不高于60kPa的要求。理论与实测都表明:采用小管径7mm替代9.52mm管径是可行的。针对小管径风机盘管机组产生低频噪声的问题,采取实验测试和数理统计方法,结合仿真分析,得出加强风机、电机座板强度,能有效的改善风机盘管机组的低频噪声。根据研究成果,采用小管径7mm替换9.52mm管径,能满足风机盘机组的传热与流阻特性,铜管用量和铝箔用有显著的下降,幅度高达22%~35%。加强风机、电机座板强度,改善了小管径风机盘管机组低频噪声水平,提升产品品质。从而提高了产品的竞争力。
[Abstract]:Fan coil tube is one of the relatively mature products in the terminal product series of central air conditioning. With the increasingly fierce competition in the market, its cost has become the focus of the market. The cost of tube-fin heat exchanger accounts for 25% / 45% of the whole machine, which becomes the bottleneck and breakthrough point of cost reduction. With the development of technology, small tube diameter provides an important opportunity to reduce the cost of fan-coil unit. At present, the mainstream of fan-coil unit is to adopt 9.52mm copper tube, while maintaining the same performance, if the 7mm tube diameter can be used, it will win the first chance for the manufacturer. In this paper, the heat transfer and resistance of fan-coil tube-fin heat exchanger are simulated and calculated, and the feasibility of replacing 9.52mm copper tube with small diameter of 7mm is analyzed. Through the theoretical calculation and analysis, the following conclusions are drawn: the heat transfer area of the 7mm small diameter tube fin heat exchanger is equal to that of the original 9.52mm tube diameter unit, and the total heat, apparent heat, water pressure drop and wind pressure drop of the heat exchanger meet the practical engineering needs. Its wind pressure drop fell by 28%, helping to reduce motor energy consumption. Therefore, from the theoretical calculation of total heat, apparent heat, wind pressure drop, water pressure drop and other parameters, the use of small pipe diameter 7mm is feasible. According to the results of theoretical simulation and analysis, the corresponding units are manufactured for verification and testing. The test results show that the total heat of the optimized unit is 98.8% / 105.8% of the total heat of the unit before optimization; The apparent heat is 97.7% / 103.2% of that of the unit before optimization, the wind pressure drop test is basically consistent with the calculated value, the energy consumption of the motor will be reduced, and the water pressure drop of the unit will meet the requirement of the water pressure drop of the coil tube not higher than that of 60kPa in the engineering application. Both theoretical and practical results show that it is feasible to use small diameter 7mm instead of 9.52mm pipe diameter. In view of the low-frequency noise produced by small-diameter fan-coil unit, the low-frequency noise of fan-coil unit can be effectively improved by adopting the method of experimental test and mathematical statistics, combining with simulation analysis, it is concluded that strengthening the strength of fan and motor seat plate can effectively improve the low-frequency noise of fan-coil unit. According to the research results, the use of small diameter 7mm instead of 9.52mm pipe diameter can meet the heat transfer and flow resistance characteristics of fan-disk unit. The amount of copper pipe and aluminum foil use have a significant decrease, the range is as high as 22% ~ 35%. Strengthen fan, motor seat plate strength, improve the low-frequency noise level of small-diameter fan-coil unit, improve product quality. Thus improve the competitiveness of the product.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TB657.2

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