Simulation Analysis On Indoor Thermal Environment Of A Solar House In Winter In Kunming

With the improvement of people's quality of life,the people have not only satisfied with the residence in aspect of indoor living,but began to pursue more comfortable living environment.Good indoor environment can make people feel happy and improve the work efficiency.It is imperative to create a good living environment.So,People pay more and more attention to the human body thermal comfort indicators PMV and thermal comfort dissatisfaction indicator PPD.Among the factors that affect the comfort of the solar house,the air temperature and air velocity are the most important factors in the environmental factors.In this paper,based on the measured data of a solar house in Kunming in winter,the parameters such as air temperature,air velocity and solar irradiance of typical position of solar housed were obtained.Taking the solar house as the research object,the numerical simulation was carried out by computer.Different temperature and velocity of hot air inlet and different air supply conditions were simulated and analyzed,the following conclusions are gained:(1)Under the condition of daytime operation,the simulated ambient temperature is 283 K,the air temperature of roof entrance is 295 K,300K,305 K,the velocity is 1.5m/s,and the analyzing area are two sections,which are 0.1m and 1.1m from the ground.When the wind inlet from above,the overall trend of indoor temperature contour was the north side high than the south.With the gradual increase of solar irradiance,indoor heat gain increased and the indoor temperature gradually increased,it peaked around14:00 p.m.The temperature started to decrease in the area near the south wall of the surface area of 0.1 m from the ground at 16:00 p.m.due to the weakening of the solar irradiance and away from the air inlet,the temperature distribution was beginning to uneven.The surface area of 1.1 m from the ground can continue to accept the solar irradiation of the south wall,the temperature was begun to decline,but the temperature distribution was more uniform.(2)The PMV values for nine points of each section which is 0.1 m from theground and 1.1 m from the ground were calculated.The PMV values of nine measured points are greater than 3 between 8: 00-16: 00 under the two air supply conditions,which was in the overheating state.The temperature in the house has been close to the overheating state while the inlet temperature was 295 K under the solar load model,so,increasing the inlet temperature was not benefit to indoor thermal comfort.The heat transfer and the indoor thermal comfort can be improved by raising the inlet temperature slightly under the case of non-overheating temperature conditions.(3)The comparison of the wind inlet from above and from below was carried out.It is concluded that the wind velocity in the horizontal plane is greatly reduced and the velocity field is even more uniform while the wind inlet from below.The average PMV value was lower and the range of PMV changes was smaller while the inlet from below.The minimum PMV value while the wind inlet was from above was close to the maximum value while the wind inlet was from below at the 0.1m under the inlet temperature was 295 K and 305 K.(4)In this paper,the effective temperature ET* was used as new evaluation criteria.The calculated result indicate that the other position was in the comfort range except the 0.4m and 2.2m.