Model Of Thermal Stability Evaluation Of Heating Buildings And Energy Efficiency Research

In recent years,reducing building energy consumption and improving indoor thermal comfort is a hot topic in the field of building thermal engineering.The research shows that the thermal stability of the building can resist the thermal disturbance inside and outside the room,and can effectively regulate the indoor thermal environment.It is also one of the ways to improve the energy saving effect of the building from the source.In China,with the rise of solar heating building technology and the diversified operation mode of energy-saving building heating,building thermal stability design and its quantitative evaluation of building energy consumption and indoor environment are becoming increasingly prominent.Therefore,it has important theoretical value and engineering application significance to conduct in-depth research on the evaluation methods and energy efficiency of thermal stability of heating buildings.In order to establish a mathematical model for quantitative evaluation of thermal stability of building envelopes with multiple factors,first,the temperature regulating process of heat storage materials and the quantitative mechanism of thermal stability of enclosure structures are analyzed,and the limitations of commonly used thermal stability parameters under internal heat sources are analyzed.Based on the above theoretical research foundation,the thermal stability evaluation model of envelop structure is proposed as the thermal stability evaluation model of enclosure structure.The thermal stability coefficient is obtained by theoretical derivation of the thermal stability coefficient.The model comprehensively considers the structure mode of the enclosure structure,the thermal insulation performance,the heat storage performance,and the influence of the heating operation mode.The proposed model has improved the quantitative evaluation method of thermal stability of heating building envelope.Secondly,in order to evaluate the thermal stability of the heating room,the calculation method of the heat absorption coefficient of the room is determined.It is also suggested that the fluctuating amplitude of room air temperature be calculated theoretically by using the heat absorption coefficient of the room and the non uniform exothermic correction coefficient.The present situation of evaluating thermal stability of rooms based on measured or simulated data is changed.The method of theoretical analysis is used to solve the non uniform exothermic correction coefficient m under different heating operating modes.When the heating is constant heat flow,the value of m is equal to 0.When the heating equipment is intermittently 6h,the value of m is equal to 1.12.When the heating equipment is intermittently 9h,the value of m is equal to 1.32.When the heating equipment is intermittently 12 h,the value of m is equal to 1.52.In addition,a mathematical model for dynamic heat transfer of envelope structure based on ANSYS is established.Based on the measured data of wall thermal stability,the accuracy of the ANSYS based dynamic heat transfer model is verified.The dynamic heat transfer models of 7 kinds of energy-efficient walls with different thermal stability are established by ANSYS,and the thermal response of the wall surface is numerically solved.The influence of different internal surface heat storage coefficient,different thermal resistance and the non uniform exothermic correction coefficient on the thermal stability of the wall is compared and analyzed.It is found that the thermal stability of the wall is significantly affected by the non uniform exothermic correction coefficient and the internal surface heat storage coefficient.The study shows that the thermal stability coefficient of wall can accurately describe the thermal stability of the wall.When the wall thermal stability coefficient is increased from 5 to 10,the maximum temperature fluctuation range is reduced by 2.5 degrees Celsius.Finally,the building model with different thermal stability is constructed,and different heating mode is set,and the meteorological data in Dalian are loaded,and the time-to-time data of building energy consumption and thermal environment are obtained.The energy saving effect and thermal response of rooms with different thermal stability are quantitatively analyzed by simulation results,and the effective compensation thickness of thermal insulation performance to compensate the thermal stability of the room is also proposed.It provides technical reference for improving the energy efficiency level of heating buildings and improving indoor thermal environment.The research shows that the improvement of thermal stability of heating buildings is conducive to improving building energy efficiency and improving indoor thermal environment.In residential buildings,when the heat absorption coefficient P increases by 46%,the maximum heat load is reduced by about 20%,and the total energy consumption during heating is reduced by 16%.In office buildings,when the heat absorption coefficient P increases by 44%,the maximum heat load is reduced by about 30%,and the total energy consumption during heating is reduced by 23%.When the insulation layer of heating residential building and heating office building is insulated by EPS plate,the thermal insulation compensation effect is significant,and the diurnal range can be reduced by about 2 degrees Celsius.The saturation compensation thickness of thermal insulation for thermal stability is 60~80mm.