农业工程学报2019，Vol.35Issue(17)：233-239,7.DOI:10.11975/j.issn.1002-6819.2019.17.028
基于温度场模拟的大花洞火炕烟道构造形式优化设计
Flue form optimization design of large complexity kang based on temperature field simulation
摘要
Abstract
With economic development and living standard improving in China, the demand by people in rural areas for thermal conformity of indoor facilities in their homes has also increased. This has become one of the main targets in rural revitalization in the country. In rural grassland areas in northern China, brick-bed (Kang) has been widely used by farmers and herdsmen as an integrated system for sleeping and heating in winter. Different kangs exist in different areas, but most of them are built with experiences and lack of temperature uniformity, giving rise to uncomfortable sleeping and poor thermal efficiency. Effectively combining natural and existing conditions to make the kang more thermally comfortable and energy efficiency is hence a key issue but has been overlooked. This paper aims to address this gap by re-designing the pathways of the smoke and flue gas in the kang using CFD software ANSYS. The smoke wall and the guide were re-set based on the principle of "front and rear guide" in that the smoke walls should make the distribution of the smoke flow improve thermal conformity and thermal efficiency. We compared two re-designed kangs and simulated the distribution of the flue gas temperature in each using ANSYS. The results show that, compared with the traditional kang, the design I reduced the exhaust smoke temperature by about 10 ℃ and increased the coverage of high-temperature flue gas in the proximity of the kang plate by about 55%. These combine to improve the temperature uniformity. For the design II, the associated reduction in the temperature and increase in high temperature coverage was 20 ℃ and 40% respectively. In summary, the flue optimization in the both designed kangs improved the spatial distribution of the smoke flow and thermal efficiency, compared to the traditional one; they also increased the temperature of the flue gas in the vicinity of the raft and adsorbed more heat of the high-temperature flue gas to the slab, thereby increasing the temperature of the slab and reducing smoke loss. All these show that the new designs significantly improved the thermal efficiency of the kang, in which the flue gas can get into the chimney flue and the kang panel through thermal absorbing and storing. They also enhance the release of the flue gas heat to improve thermal conformity within a wide range of high temperature. ANSYS is a tool that can be used to improve design of thermal-efficient kang.关键词
温度/流场/优化/大花洞火炕/烟道形式优化/热效率/ANSYS流场模拟Key words
temperature/flow field/optimization/large complexity kang/flue form optimization/thermal efficiency/ANSYS flow field simulation分类
建筑与水利引用本文复制引用
张杰,陈丽珠,王伟栋..基于温度场模拟的大花洞火炕烟道构造形式优化设计[J].农业工程学报,2019,35(17):233-239,7.基金项目
国家自然科学基金项目(51668051) （51668051）
国家自然科学基金项目(51868060) （51868060）
