Study On The Influence Of Air Conditioning Angle On Indoor Comfort

In today's society,people are increasingly pursuing a healthy,comfortable,ecological,and energy-saving lifestyle.The requirements for indoor comfort are getting higher and higher.Various forms of air conditioners have become the most common choice for improving indoor heat and humidity.The influence of air-conditioning air supply mode and air supply angle on indoor air is directly related to the advantages and disadvantages of indoor comfort.In this paper,the combination of Airpak numerical simulation and field test is used to study the indoor thermal comfort of air-conditioning in an office building.The office is located in Jinan,Shandong Province.The room size is 10.8m?L?×8.4m?W?×3.5m?H?.Three fan coil units are evenly arranged in the east-west direction of the room.The west fan coil unit is a side air supply louver tuyere.The air supply angle can be adjusted;the intermediate card fan coil unit is a four-out air outlet,and the air supply angle can be adjusted;the east side fan coil unit is a diffuser,and the air supply angle is fixed at 45°.First,in order to determine the appropriate air supply angle for each air outlet,each fan coil unit is simulated with different air supply angles when it is separately opened.Under the simulated conditions of the supply air temperature of 28?and the air supply speed of 3 m/s,the west side fan coil unit are operated under conditions 1⁴?the air supply angles are 0°,30°,45°,and 60°?.Simulation,the middle fan coil unit is used for the simulation of working conditions5⁸?the air supply angle is 30°,45°,60°and 90°?,and the east side fan coil unit is only working condition 9?the air supply angle is 45°?.The simulation results show that when the air supply angle of the side air blower coil is 0°or 30°,the air supply air supply distance is far.In the working range of vertical height of 2 meters,the indoor temperature difference and wind speed are small,and the thermal comfort is better.The air supply angle is 45°or 60°;when the air outlet angle of the four air blower coil is 45°,the indoor temperature distribution is relatively uniform and the wind speed is small,and the thermal comfort is better than the air supply angle of 30°,60°or 90°.Secondly,simulate the simultaneous opening of three fan coil units.The simulation process sets the air supply angle of the west side fan coil unit to 0°,the intermediate air conditioner air supply angle to 45°,the east side fan coil unit air supply angle to 45°,the supply air temperature to 26?,and the supply air speed to 3m/s.The results show that in the 2m working area,the indoor temperature distribution is uniform,about 20.1²2.1?,the indoor horizontal temperature difference is less than 1°C,the vertical temperature difference is less than 2?,the indoor wind speed is less than 0.3m/s,and the human unsatisfactory rate is less than 20%,thermal comfort is better.Finally,the actual measurement of the simultaneous opening of the three fan coil units was carried out.During the actual measurement,the air supply air supply angle,temperature and speed are basically the same as the simulated setting conditions.During the actual measurement,the indoor and outdoor parameters are measured by means of temperature and humidity measuring instruments,including indoor temperature,wall surface temperature and indoor CO₂concentration.The results show that in the 2m working area,the indoor temperature is between20.3²1.6?,the indoor horizontal temperature difference is less than 0.5?,and the vertical temperature difference is less than 1.5?.The simulation results of indoor temperature are in good agreement with the measured results.