Study On Heat Storage And Release Rule Of Agricultural House Floor And Its Influence On Indoor Thermal Environment In Hohhot Area

The climate characteristics of cool summer and cold winter in severe cold regions make the demand for winter heating of farm houses in this region high,and the energy source for heating is often fossil fuels or electric energy.Effectively reducing the use of fossil fuels for farm houses in winter has become an important issue of concern in northern regions.The climate characteristics of cool summer and cold winter in severe cold regions make the demand for winter heating of farm houses in this region high,and the energy source for heating is often fossil fuels or electric energy.Effectively reducing the use of fossil fuels for farm houses in winter has become an important issue of concern in northern regions.It is worth noting that this area is rich in solar energy throughout the year.Concrete floors in farm houses,solar radiation as energy source and floor as energy carrier can effectively solve the above problems and improve the poor indoor thermal stability of farm houses in the north.Therefore,this paper takes concrete floor as the research object to study the influence of floor heat storage and release law on the indoor thermal environment of rural houses in Hohhot area.It is worth noting that this area is rich in solar energy throughout the year.Concrete floors in farm houses,solar radiation as energy source and floor as energy carrier can effectively solve the above problems and improve the poor indoor thermal stability of farm houses in the north.Therefore,this paper takes concrete floor as the research object to study the influence of floor heat storage and release law on the indoor thermal environment of rural houses in Hohhot area.Firstly,the evaluation standard of floor heat storage and release is established and the research method of the subject is determined.Through the analysis of the whole process of floor heat storage and release,the evaluation index of floor heat storage and release and the index of floor operation ability are established,and the evaluation index of indoor thermal environment is established.By analyzing the parameters satisfying each index,the research method-numerical simulation is obtained.Using the numerical simulation method,the simulation software and numerical model are selected and established,which lays a foundation for the subsequent simulation.Second,the physical model and related boundary conditions and initial conditions are established.Taking the rural house in Hohhot area as the prototype of this study,on the basis of the minimum consumption of simulation resources,the two-dimensional model of the room and the floor is established according to the requirements of numerical simulation,and the discrete results meet the requirements.The boundary conditions and initial conditions of the model are set.The error between the two models and the experimental results is less than5%,which can be used as the basic model for subsequent simulation.Third,the law of floor heat storage and release under different factors is studied.Taking input temperature,concrete material,water flow rate and filling layer thickness as variables,the heat flux and temperature change of the floor within 10 h of heating are simulated,and the heat storage of the floor under the four factors is calculated.The optimal variables of each factor are obtained by analyzing the calculation results.The input temperature is 46℃,the filling layer material slag concrete,the water flow rate is 0.3m/s,and the thickness of the filling layer is 50 mm.After verification,it is found that the fitting degree of the floor fitting curve is good,which can be used as the basis for subsequent simulation.Fourthly,the influence of floor operation mode on indoor thermal environment and the optimization of floor operation are studied.The external disturbance is loaded on the room model,and three conventional operation modes of the floor are established to obtain the change law of the indoor thermal environment after 10 h of floor operation.Through the analysis of indoor temperature,indoor heat load and the calculation of indoor fire dissipation,the following conclusions are obtained: the conventional operation mode cannot guarantee the demand for heat in the intermittent period,and the indoor temperature is easy to be lower than 16℃.Therefore,the original operation mode was optimized,considering the cooking activities of residents in the agricultural house from 11:00 to 12:00 in the morning.The results show that the optimized floor can better meet the needs of residents.This paper provides an effective solution to the problem of poor indoor thermal stability of rural houses in the north in winter,improves the living environment quality of rural houses,meets the basic needs of residents for the living environment,and reduces the use of nonrenewable resources in rural houses,which is of great significance for further realizing the national green development concept.