| With the improvement of economic level, the demand of the rural residents has been higher and higher with the thermal comfort of houses. The main way of getting heating is Kang in rural areas. But the existing problems of the traditional Kang cann’t be ignored, such as the nonuniform surface temperature of the Kang, the waste of energy, air pollution and so on. So in order to embody the advantages of the Kang, more innovation and development should be put on the traditional Kang. Two improving methods,adding the heating exchanger equipment on the head of the Kang and using Kang with hot-wall as a new style, have be proposed for the problem of the nonuniform surface temperature of the traditional Kang. At present the most of the improving methods is based on the experiments, which is real but complex. And experiments have to be done repeatedly as one condition changed. Also they are not only in a low efficiency, but also with no wide generality. So it is necessary for us to compile targeted simulation software with for the thermal performance of traditional Kang in the rural.First, the study is aimed at the thermal performance of the traditional Kang. And two methods, Simplifying the boundary conditions of the steady heat transfer and the actual unsteady heat transfer, have been put out through heat transfer, fluid mechanics and mass transfer theory knowledge to do some in-depth analysis and research, to determine the mathematical model of flue gas temperature and Kang surface temperature, the mathematical model of heat storage and heat release and the mathematical model of Kang with internal heat exchanger. Thus the steady state calculation with Simpling boundary conditions has the common using value in engineering practice. So it is pressing to develop the novel Fire Kang to improve energy utilization and make the surface temperature of the Kang to be uniform.Second, the thermal performance of the new style Kang with hot-wall has been studied by two calculation method. Propose the Mathematical model of surface temperature changing and heat storage and release to give the comprehensive evaluation of the thermal performance of the Kang with hot-wall. It is also get that the error of thermal performance of the Kang with hot-wall is in an acceptable range with the two calculation method. The temperature of the Kang with hot-wall has been obviously improved and the utilization of it has been higher.Third, developing the simulation software of the Kang thermal performance, the development of this software greatly simplified the complexity of experiment research. With applicating the database technology, people can choose different fuels, different forms of the Kang, different Kang body materials through the software, and can simulate the hourly temperature of Kang surface, the flue gas temperature in the Kang and heat storage properties of it by entering the different boundary conditions. And determine the best boundary condition to improve the thermal comfort of Fire Kang through the different choices and input. The simulation software of thermal performance of the Kang is very flexible, and it has universality, openness and intuitive.Finally validating software simulation results of the thermal performance of the Kang by the FDS simulation and the experiment. Confirming the thermal performance of the Kang can be exactly simulated by the software mentioned above. This paper contrasts the thermal performance with the conditions of steady and unsteady between the traditional Kang and the Kang with hot-wall. And compiling the software simulation of the thermal performance of the Kang will reduce the complexity of experimental study. |
