火墙式火炕炕体传热特征及内部烟气流动特性实验研究

Experimental Study on Heat Transfer and Internal Smoke Flow of Hot-wall Kang

火炕是目前我国北方地区解决农村采暖问题、优化能源消耗结构和提高室内热环境的一种有效方式。本文以火墙式火炕为研究对象,采用实验研究的方法,分析了火炕内部烟气温度分布、烟气物理性质、烟气流动特性,以及烟气和火炕本体热量分布,为火墙式火炕的进一步优化设计提供了依据,同时也为低流速下烟气流动换热的研究提供了参考。实验结果表明,火炕内部烟气温度主要分上、下两层,烟气质量流速维持在0.05～0.065kg/s,烟气所带热量的60%～80%传给了炕体本身,炕本体效率可高达80.5%。存在的问题是排烟损失和通过火墙正下方地面的热量损失较多,火墙式火炕的结构有待于进一步的优化。

Kang is an effective appliance for solving the heating problem,optimizing the rural energy structure and improving the indoor environment in northern rural areas.In this paper,taking the hot-wall Kang as the research object,the heat transfer and internal smoke flow performance were experimentally studied.Based on the experimental results,important parameters were analyzed,such as temperature distribution of smoke,physical property of smoke,smoke flow performance,flow and heat distributions of internal smoke and Kang body.Results demonstrated that the smoke temperature was divided into the upper layer and the lower layer,the mass flow rate of smoke during the firing periods was of 0.05～0.065 kg/s,60%～80% of the total heat of smoke was transferred to the Kang body,and the heat efficiency of Kang was up to 80.5%.In addition,it was concluded that there was a lot of heat loss from exhaust smoke and the floor under the hot-wall,therefore,further structure optimization was needed.