Optimization Design Of Indoor Natural Ventilation In Pit Yard In Western Henan Province

The pit yard in western Henan Province is a kind of residential building with unique style.It has the advantages of low cost,warm in winter and cool in summer,strong earthquake resistance and so on.It is a typical embodiment of harmony and common prosperity between man and nature.At present,there are some problems in the living environment of pit yard,which makes this kind of folk house dying out.The main reason is that the ventilation of the underground courtyard is not smooth,because of poor ventilation,indoor humidity and even mildew,high concentration of air pollutants,which is not conducive to people’s living.Due to poor ventilation,indoor humidity and even mildew,not conducive to people living.In order to solve these problems,improve the comfort of kiln life,and make the pit yard courtyard get more far-reaching development,and retain more living fossils of traditional dwellings for future generations,this paper takes pit yard courtyard in western Henan as the research object,and takes optimizing its indoor natural ventilation as the research purpose,Several effective measures to optimize the indoor natural ventilation of pit yard are put forward to provide better living environment for local villagers living in pit yard.Based on the purpose of the above research,the main work is as follows:1.This paper makes a survey on the indoor thermal environment of two villages in Shanzhou District,Sanmenxia City,western Henan Province.Three of them are selected to test the indoor thermal environment in winter and summer.Through the analysis of the test results,it is known that the indoor natural ventilation of the underground courtyard is not good,but the ventilation demand in winter can be basically met,and the indoor air relative humidity in summer is high,The demand for indoor ventilation is high.2.Combined with the principle of natural ventilation and the current evaluation standard of indoor natural ventilation effect and mechanical ventilation,the evaluation standard suitable for the research object of this paper is selected,so as to carry out quantitative evaluation of indoor ventilation effect before and after the transformation,and at the same time,the simulation software suitable for this paper is determined.3.Taking Qucun pit yard hospital as the calculation object,this paper selects two appropriate theoretical calculation methods to calculate the total ventilation amount required by the comprehensive ventilation of the pit yard hospital in detail,and compares the results of the two calculation methods,and selects the more accurate total ventilation amount required to eliminate the residual humidity as the final calculation result,which provides basic data for the later analysis;At the same time,it calculates the ventilation rate that can be achieved at present.The results show that the ventilation rate of the underground yard is far from the standard of comprehensive ventilation,so it is imperative to improve the indoor ventilation condition.4.Aiming at the situation of poor ventilation and poor indoor air quality in summer,based on the principle of indoor natural ventilation,several ventilation shaft schemes are given for the optimization and transformation of indoor natural ventilation in dikeng hospital.Based on these schemes,SCDM information model is established to simulate and verify the transformation scheme.Firstly,the indoor and outdoor wind environment of each model after transformation is simulated and analyzed,and it is concluded that the transformation scheme proposed in this paper can promote the indoor natural ventilation of pit yard;After that,the best parameters of different types of ventilation shaft are summarized through several simulation verification;On the premise of determining the best parameters of various ventilation shafts,the transformation degree of indoor wind environment of pit yard is calculated respectively.The effect of simple ventilation shaft on improving indoor natural ventilation environment is slightly small,the improvement effect of ventilation shaft with heat collecting plate is obvious,and the ventilation effect of ventilation shaft with chimney effect is general in summer when there is no thermal heat source,The ventilation shaft with no power hood is adopted,which has wide application range and good ventilation effect;In addition,the specific ventilation optimization mode suitable for each functional room is matched.