空气—空气全热交换器的性能研究及结构优化

发布时间：2018-01-31 11:51

本文关键词： 全热交换器交换芯材导热性能透湿性能气流分布均匀性结构优化　出处：《青岛理工大学》2013年硕士论文　论文类型：学位论文

【摘要】：在经济发展和全球性能源危机的双重因素下，人们一方面对室内空气品质的要求提高，另一方面又大力提倡节能减排，所以在暖通空调领域，就形成了节约能源和改善室内空气质量的矛盾；全热交换器作为解决这个矛盾的理想设备之一，具有广阔的应用前景，备受国内外的关注。为提高国内全热交换器产品的热回收效率，进而提高产品的市场竞争力，本文针对国内市场一种常见板翘式全热交换器，从芯体通道构型到全热交换芯材再到整体结构进行了系统深入的研究，主要工作及结论如下：（1）本文采用数值模拟的方法研究了芯体通道构型、翅片二次换热面对交换效率的影响。结果表明：对于板翘式全热交换器，应考虑波纹板所形成的二次换热面，且正三角形流道较其他通道构型性能更佳；并且采用高导热翅片材料可以有效的提高全热交换器的交换效率。（2）本文使用热线法测量设备，结合设计制作的芯材热质交换性能测试实验装置，对芯材的导热性能及湿扩散性能进行了研究，并结合SEM图，分析了微观结构对芯材吸湿行为的影响，，结果表明：芯材的含水率影响芯材的导热系数，同时发现内部结构整齐，有纳米孔口，且空隙分布均匀的芯材有良好的透湿性能；研究结果为高效导热透湿膜的设计提供了依据。（3）采用实验与数值模拟相结合的方法研究了芯体迎风面气流分布对换热效率的影响。研究发现，全热交换器在实际的应用过程中，由于入口段结构不合理产生漩涡、回流等现象，使得芯体迎风面的气流分布是不均匀的，且这种不均匀性会降低全热交换器的换热效率；这也表明优化全热交换器流道结构来改善芯体迎风面的气流分布均匀性对换热效率的提高也极为重要。（4）本文建立了全热交换器综合测试实验台，并根据前文的分析，提出了全热交换器的结构改进思想，并在实验台上对改进方案做了对比分析，结果表明：这种新型全热交换器结构能够有效的提高换热效率。本文对全热交换器的研究提出了一些新思路，为其优化设计提供了理论参考，对全热交换器的进一步发展具有重要的指导意义。
[Abstract]:In the dual factors of economic development and global energy crisis, people on the one hand to improve indoor air quality, on the other hand, vigorously promote energy conservation and emission reduction, so in the field of HVAC. The contradiction between saving energy and improving indoor air quality is formed. As one of the ideal equipments to solve this contradiction, total heat exchanger has a broad application prospect and has attracted much attention at home and abroad. In order to improve the heat recovery efficiency of domestic total heat exchanger products and improve the market competitiveness of the products, this paper aims at a kind of common plate tilting type total heat exchanger in the domestic market. The main work and conclusions are as follows: (1) the structure of the core is studied from the core channel configuration to the total heat exchange core material and then to the whole structure. The main work and conclusions are as follows: In this paper, the effects of core channel configuration and finned secondary heat transfer on the exchange efficiency are studied by numerical simulation. The results show that: for plate tilting type total heat exchanger. The secondary heat transfer surface formed by the corrugated plate should be considered, and the triangular channel has better performance than other channels. And the exchange efficiency of total heat exchanger can be improved effectively by using high heat conduction finned material. In this paper, the thermal conductivity and wet diffusion properties of the core materials are studied by using the hot-wire measuring equipment and the heat and mass exchange test equipment designed and made, and the SEM diagram is combined. The effect of microstructure on moisture absorption behavior of core material is analyzed. The results show that the moisture content of core material affects the thermal conductivity of core material. The core with uniform void distribution has good moisture permeability. The results provide a basis for the design of high efficiency heat and moisture permeable film. (3) the effect of the air flow distribution on the heat transfer efficiency on the upwind surface of the core is studied by using the method of experimental and numerical simulation. It is found that the total heat exchanger is in the practical application process. Due to the phenomenon of vortex and reflux in the inlet section, the airflow distribution on the upwind surface of the core is not uniform, and the heat transfer efficiency of the whole heat exchanger will be reduced by the inhomogeneity. It also shows that it is very important to optimize the flow channel structure of total heat exchanger to improve the uniformity of air flow distribution on the upwind surface of the core for the improvement of heat transfer efficiency. In this paper, the comprehensive test bench of total heat exchanger is established, and according to the analysis above, the idea of structure improvement of total heat exchanger is put forward, and the improved scheme is compared and analyzed on the test bench. The results show that the new structure of total heat exchanger can effectively improve the efficiency of heat transfer. In this paper, some new ideas are put forward for the research of total heat exchanger, which provides a theoretical reference for its optimal design, and has important guiding significance for the further development of total heat exchanger.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU83

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