Thermal Performance Of Hot-water Heating Of Cooking-stove Combined With Thermal Storage Floor In Rural House

In recent years, with the development of economy China rural residential energy consumption continues to grow. And rural energy structure which was based on traditional non commodity energy like straw and firewood has changed to commodity energy such as coal and electricity. But because of low efficiency of heating equipment and single heating mode, the indoor thermal environment in rural areas is not much improved. There are still problems that indoor temperature is too low and night temperature drops too large. China rural areas are rich in biomass and solar energy and other renewable energy sources, so it is very necessary and feasible to develop multi-heat-source complementary integrated heating system in rural areas.In this paper, combined with the previous research on experiment and mathematical model of thermal storage floor, the structure and use temperature of thermal storage floor are analyzed and the experimental and model research of cooking-stove radiator heating system are completed. Finally, a mathematical model of heating system of solar thermal storage floor and cooking-stove radiator is established based on the inner surface temperature of the envelope structure as the boundary. This article has carried out the following specific work:Firstly, the cooking-stove radiator heating system is experimentally studied. Analyzing the cooking-stove’s collecting power of collector and the radiating power of radiator and the heat storage capacity of water and radiator in the system, the unsteady mathematical model of radiator and the model of heat gain of cooking-stove collector are established. Then, the cooking-stove radiator heating system is simulated dynamically and a comparison is made between the results of simulation and experiment.Secondly, the mathematical model of thermal storage floor is improved and the model accuracy has been experimentally verified. The conclusions gotten by analyzing the structure and heating quantity under different supply water temperature of thermal storage floor in the improved mathematical model are as follows. The insulation layer at least 15cm is arranged outside thermal storage body of thermal storage floor except the upper surface. The distances of between buried pipes and the upper surface of thermal storage body is 20cm, and 40cm for the bottom surface. Thermal storage floor is more suitable to be used as the heat radiating end of the supplementary heating, which can use solar heat collector as heat source well.Finally, calculating the indoor air, the mathematical models of solar thermal storage floor system and cooking-stove radiator system are combined into the model of complex heating system of solar thermal storage floor and cooking-stove radiator based on the inner surface temperature of envelop structure as the boundary. Then, the complex heating system is simulated dynamically. Under the same heating capacity, the results of comparison the temperature of complex heating system compared with cooking-stove radiator system show that the addition of thermal storage floor can remain room temperature stable and ensure the room temperature not too low in the early morning. The design of complex heating system is carry out.