Study On Indoor Comfort Optimization Of Ultra-Low Energy Consumption Building In Cold Area Based On Natural Ventilation

With the continuous improvement of life quality,people’s requirements for the living environment are also rising.At the same time,under the national "double carbon" strategy,Ultra-low energy consumption building which can decrease energy conservation and create comfortable environment have been vigorously promoted in China.According to the characteristics of the weather and site conditions,Ultra-low energy consumption building is suitable for the maximum reduction of energy consumption requirements such as building heating,air conditioning,lighting,and provides a comfortable indoor environment with minimal energy consumption by improving the efficiency of energy equipment and systems and making full use of renewable energy through passive building design.However,the development of Ultra-low energy consumption building in China is still in its infancy,and there are few studies focusing on the impact of natural ventilation on the indoor thermal comfort.Based on this,this paper conducts a study on the impact of natural ventilation on the indoor thermal comfort of Ultra-low energy consumption building.(1)In view of the Ultra-low energy consumption building which have been operated in Zhengzhou,the indoor air temperature,relative humidity,wind speed and black ball temperature of different rooms of office buildings and residential buildings are studied under different working conditions.Using PMV-PPD and CIHB values and other evaluation indicators for analysis,the results show that the predicted heat sensation of the three characteristic rooms is slightly cooler in the office building during the transition season under the natural ventilation conditions;the human body feeling of the three characteristic rooms is warmer and more comfortable in the summer high humidity season under the working conditions of natural ventilation at night;the human body of the first and second floors of the residential building feels comfortable for residential buildings in the summer high humidity season under the working conditions of natural ventilation at night.(2)Software simulation analysis of natural ventilation are carried out,the simulation data is compared with the measured data of the same location measurement point to verify the reliability of the model.On the basis of the calibration model,four different factors including outdoor temperature,indoor initial temperature,inlet air velocity and window opening were selected for simulation and analysis.The simulation results turn out that the outdoor temperature has the greatest influence on indoor thermal comfort,followed by inlet air velocity,window opening,and indoor initial temperature,and window opening has a certain impact on the distribution of indoor thermal comfort.(3)Combined with the influencing factors obtained by the simulation,an intelligent window’s opening linkage control method suitable for Ultra-low energy consumption building is proposed from the perspective of optimizing indoor thermal comfort.Based on the indoor and outdoor environment parameters under typical working conditions,the optimized window’s opening degree is calculated by the method,which shows that the window opening based on the method can effectively improve indoor comfort compared with the unregulated opening through simulation analysis.Finally,a natural ventilation strategy suitable for the building to improve indoor comfort is given based on the local climatic conditions.In summary,this paper studies the impact of natural ventilation on the thermal comfort of Ultra-low energy consumption building in cold regions,which can provide a certain reference for creating a more comfortable indoor environment.