| People spend most of their lives indoors.Indoor thermal comfort has a certain impact on people’s health.A comfortable environment can stimulate human work and learning efficiency.Due to the unreasonable use of air-conditioning equipment in the past,people have reduced their adaptability to the external environment,which is harmful to health.At the same time,the unreasonable use of air-conditioning equipment has caused the increase of energy consumption.Using outdoor fresh air to adjust indoor thermal environment to a relatively comfortable state is conducive to people’s physical and mental health and reduce energy consumption.Our country is a big energy country,but also a big energy’ consumption country.The energy consumption is rising.Saving energy is our responsibility and obligation.For indoor thermal comfort research,it is conducive to the regulation of indoor thermal comfort,so that the indoor is in a comfortable state,which can stimulate the working efficiency of the human body,and is conducive to human learning and work;at the same time,the comfortable indoor environment is conducive to the physical and mental health of the human body,to meet the human need to close to the comfortable life of nature.In order to study the influence of indoor ventilation on thermal comfort,and to use the natural environment reasonably to reduce the energy consumption,a classroom in a university teaching building in the northern city of Shenyang was selected as the research object.In the transition season,the indoor temperature distribution shows that the temperature of the middle side and the inner side is higher than that of the outer side,the highest temperature is 23.6℃,and the lowest temperature is 23.1℃;in the transition season,the indoor wind speed distribution shows that the middle side is higher than the two sides,the highest wind speed is 0.1 m/s,and the minimum wind speed is 0.03m/s.In order to analyze the distribution of wind field and temperature field more intuitively,we use fluent software to build the model,draw the velocity vector diagram and temperature distribution diagram.According to the comparison between the measured data and the simulated data,the maximum relative error of the temperature in the transitional season is 3.4%,and the minimum relative error is;the maximum relative error of the wind speed in the transitional season is 50%,and the minimum relative error is 0.The maximum relative error of indoor temperature in summer is 1.9%,and the minimum relative error is 0.4%;the maximum relative error of indoor wind speed in summer is 33.3%,and the minimum relative error is 0.Finally,the thermal comfort of indoor thermal environment is calculated by PMV-PPD formula,and the regulation and control of indoor thermal comfort are analyzed.The field measurement and simulation results show that the indoor temperature distribution in the transition season and summer basically shows that the lower temperature is slightly lower than the upper temperature,and the wind speed on both sides is slightly higher than that in the middle.Through the comparison of the measured results and the numerical simulation results,it is found that the relative error of temperature in summer is small,and other errors are within the acceptable range.According to the calculation results of indoor thermal comfort,it can be seen that the actual measurement and calculation results of transition season conditions PMV are between 0.4 and 0.7,while the actual measurement and calculation results of summer conditions PMV are between 0.4 and 0.63,the PMV of transition season conditions calculated by the numerical simulation results is between 0.28 and 0.64,and the PMV of summer conditions is between 0.39 and 0.65;the PP of transition season conditions and summer conditions calculated by the measured results D is between 8%and 15%,the PPD calculated by numerical simulation results is between 7%and 14%in the transition season and summer conditions,which is within the range required by the actual situation in China,i.e.-1.0<PMV<1.0;PPD<0.26.It is concluded that the indoor thermal environment in summer and transition season is in a comfortable state.Finally,the indoor ventilation model is optimized to increase the number of indoor ventilation windows.Through the simulation calculation,the indoor PMV is less than 0.5 and the PPD is less than 10%in the transition season and summer,and the absolute value of indoor PMV is closer to 0 and the PPD is closer to 5%compared with the measured simulation results.The indoor thermal environment becomes more comfortable.On this basis,changing the air inlet temperature and air flow speed,it is concluded that when the external environment temperature is below 30℃,the indoor air flow speed should be controlled between 0.2m/s and 0.25m/s,at this time,the indoor thermal environment is in a comfortable state. |
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