Study On Heat Utilization And Operation Adjustment Measures Of Burning Cave Coil Heating

In recent years, with the rapid development of rural residential construction technology in Northeast China and the requirement increase of winter indoor thermal comfort, burning cave heating as a low energy consumption, low cost, comfortable heating mode is gradually break through limitations and it has a far-reaching impact on reducing burden to the rural energy supply in China. At present, burning cave building also rely mainly on private experience and lack of theoretical support, so the traditional burning cave building existing heating floor surface temperature distribution is not uniform cause local overheating; the energy utilization efficiency is low and the heat transmission is not reasonable; fuel smoldering is difficult to control and can not guarantee the heating srability. How to solve the problem burning cave exist reasonably to improve the thermal performance of need for further scientific research in order to provide effective technical support for the popularization and application of burning cave heating technology. In the thesis, the following work was accomplished by both experimental studies and theoretical analysis.Firstly, an experimental study on thermal performance of the new Eco-rural residential and burning cave coil heating system was carried out to comparative analysis of indoor thermal and humid environment and air quality, to understand the floor heating surface temperature field and heat energy utilization mode. The results show that Eco-rural residential mode is accord with the concept of sustainable architecture. Eco-rural residential winter indoor thermal environment and indoor air quality are much better than traditional residential. When the outdoor temperature as low as-16.3℃, burning cave room temperature still can ensure stable at above12℃, but more than90%of temperature is4-10℃in the traditional kang room. Although the initial investment increase by about18%, cost recovery period is short. There are improved in the rationality of heat energy utilization and heating floor uniformity of temperature distribution of burning cave coil heating system. The effect of coupled heating pattern is superior to that of single burning cave pattern (R=0.83).Secondly, a simplified radiation and convection heat transfer model of the burning cave coil heating system experiment device was developed to deal with different surfaces energy distribution at different heights of smoldering surface and from theory to quantify the average percentage of energy of each part of burning cave coil system(ηx=39.36%、ηnb=61.28%). Finally, based on the necessity of adjustment measures of burning cave coil heating system, to determine the main operation parameters of the system and through comparison and analysis of different modes of adjustment, the mode of adjustment limiting oxygen+variable flow is confirmed. Based on burning cave design method proposed by the research group, the burning cave coil heating system is designed. System thermal ventilation equation is set up on the basis of the simplified model and the working principle. Variation of the opening degree of the temperature adjusting plate with outdoor air temperature is determined. When the temperature is-15℃,the opening degree is58.1°.