Abstract In order to optimize structural design and balance heat distribution of the raised floor heating system heated by a burning cave, an unsteady heat transfer process of the raised floor was analyzed and discussed. An unsteady heat transfer model of the raised floor heating system was established to solve the problem of inner natural convection by air coupled with radiation and conduction heat transfer between two floor surfaces by computational fluid dynamics (CFD). Moreover, heating intensity, structural size and position of the heat source (burning cave) impact on the heat transfer performance and heating effect were discussed, which can provide a theoretical basis for parameter matching and structure optimizing. The results indicate that the best position of burning cave is under the center ground of a rural house, where the reasonable heat intensity of the burning cave is about 200 W/m2. The calculated temperatures and velocities are in reasonable agreement with measurements on the model house, which can provide a basic data support for the engineering practice of raised floor heating system.

中文翻译：

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带燃烧室的架空地暖系统传热过程的数值模拟

摘要 为优化燃烧洞穴加热的活动地板采暖系统的结构设计和平衡热分布，分析讨论了活动地板的非稳态传热过程。【摘要】：通过计算流体动力学(CFD)方法,建立了活动地板采暖系统的非稳态传热模型,解决了空气内部自然对流与两层地表之间辐射、传导传热耦合的问题。并讨论了加热强度、结构尺寸和热源（燃烧穴）位置对传热性能和加热效果的影响，为参数匹配和结构优化提供理论依据。结果表明，燃烧洞穴的最佳位置是在农村房屋的中心地面下，其中，燃烧洞穴的合理热强度约为 200 W/m2。计算得出的温度和流速与样板房实测值吻合较好，可为活动地板采暖系统的工程实践提供基础数据支持。