Characteristics Of Hot Air Supply In Winter For Domestic Air Conditioners Based On Jets Attached To Corners

At present,mixed ventilation is still a commonly used air distribution form in domestic air-conditioning.There is a common problem that the indoor vertical temperature gradient is too high when household air conditioning is used for heating in winter.In addition,the unreasonable air flow organization also reduces the ventilation energy utilization rate.Professor An-gui Li’s research group has been conducted long-term research and practice on the air curtain ventilation airflow organization for many years.The author intends to apply the attached jet to the heating of domestic air conditioners in winter,and explore the characteristics of the hot air supply of the domestic air conditioners based on the attached jet at the corners in winter.The purpose of this article is to explore the possibility of using jets attached to the corners of a household air-conditioning heating system in winter.Based on the preliminary research of the research group,the influence factors such as the air supply height,horizontal position of air outlet as well as height of air outlet are analyzed by numerical simulation,and some indexes are adopted to estimate the thermal environment.The influence of the obstacles of the bed,wardrobe,and bedside table on the heating effect of the wall attachment was compared with the empty room.Based on the measurement conditions of the mixed and attached ventilation heating,the heating effect of the three ventilation modes was analyzed.The effect of wall length on hot air ventilation with jet attached to the corner was explored.The results showed that,the position of the air inlet affects the temperature distribution.When the air supply height is 1.2m,the axis temperature decay is slow,the distance in the horizontal direction is long,and the heating effect is good.As for the air outlet,it is better to be set at the farthest distance from the air inlet.Then,despite theexistence of obstacles such as beds,wardrobes,bedside cabinets,the average temperature and speed values,vertical temperature gradients,and ADPI values ??in the work area all meet the standard requirements,the temperature distribution is uniform,and the obstacles increase the temperature distribution to a certain extent uniformity.In addition,the vertical temperature difference and temperature non-uniformity coefficient of the attached wall heating are the smallest,and the ventilation efficiency was the largest;the ADPI value of the vertical wall attached heating was the largest and meet the requirements;the ADPI of the wall attached heating and mixed ventilation heating didn’t meet the requirements.The effect of the wall length on the hot air delivered by the jet attached to the corner of the wall is mainly in the plane parallel to the wall surface and the horizontal plane,and has little effect on the plane perpendicular to the wall surface;regarding the plane parallel to the wall surface,the hot air diffusion distance and the attenuation of the axis velocity with the wall length Shorten and decrease;as for the horizontal plane,the wall length mainly affects the temperature distribution,and has little effect on the change of the velocity field in the plane.The area covered by hot air diffusion decreases with the shortening of wall length,but the average temperature in the covered area is higher,which is consistent with energy conservation.This study initially explored the influencing factors and heating effects of the attached jet home air conditioner in winter in the corner,and provided a design reference for the application of the attached jet to the domestic air conditioner in winter.