Research On Air Distribution Analysis And Optimization Of Air-Conditioning In A Hotel Lobby

The hotel lobby is one of the important functional areas of the hotel.It has the characteristics of large area,high space,complex function and high decoration standard.Therefore,the air-conditioning heat and cold load is relatively large,and the arrangement of the indoor air supply port and the return air outlet is in contradiction with the interior decoration.In this case,the airflow distribution and temperature distribution in the human activity area are prone to be uneven,which reduces the thermal comfort level of the indoor personnel,and reasonable airflow organization can improve the indoor thermal comfort level and reduce the air conditioning energy consumption.In this study,the lobby of a hotel in Yangzhou was taken as the research object.The actual measurement and numerical simulation of the air conditioning system in the winter and summer were carried out,and the problems were pointed out.In this study,the lobby of a hotel in Yangzhou was studied.The condition of winter and summer operation of the air conditioning system in this area was measured and the airflow organization was numerically simulated.The problems were found in measurement and simulation.According to the problems,the improvement of the air flow rate in the active area,the uniformity of temperature distribution and the improvement of thermal comfort were proposed,which has guiding significance for the transformation of the air conditioning system.According to the structural characteristics of the hotel lobby,the temperature and air speed at 1.7m and 2.4m were measured.The numerical model of the hotel lobby was established and numerically simulated by FLUENT.After comparison and verification,the numerical simulation results are in good agreement with the measured data and the simulation results,which shows the reliability of the numerical model and calculation method.Through the analysis of the velocity field and temperature field of the numerical simulation of the original air conditioning case in winter and summer,The results show that the velocity field distribution basically meets the design requirements except for the area close to the air supply opening.It also shows that the temperature field of the human activity area is unevenly distributed.In particular,the temperature of the front service area is lower than other areas and there is a significant temperature difference in the height direction of the area.In summer,the overall temperature of the indoor personnel activity area is lower than the design value.According to the distribution of PMV and PPD,the thermal comfort is poor and the air temperature is low.Seven optimization schemes were proposed for the problem that the hotel lobby has uneven temperature and low average temperature in summer.Schemes 1 to 6 adjust the speed of the air supply opening in the front service area,the air supply angle,the position of air supply opening,and the number of air supply opening to improve the temperature unevenness in the front service area.The results show that the uniformity of the temperature field is closely related to the air supply speed and the air supply angle,and also has a close relationship with the uniform distribution of the air supply opening.When the air supply opening A and B are closed,the temperature uniformity of the front service area is improved.Based on the improvement of temperature uniformity in the lobby,Scheme 7 adjusts the air supply speed and temperature of all air supply opening.The simulation results show that the indoor average temperature in summer increases,the thermal comfort of the human is greatly improved,and the energy consumption of the air conditioning system is also reduced.Compared with the original air conditioning scheme,the indoor average temperature of scheme 7 is increased by 2.6 ?,the temperature unevenness coefficient is reduced to half of the original scheme,and the temperature field is obviously improved.The PMV is between-0.5 and +0.5.The value of PPD was reduced to about 10%,and the human thermal comfort satisfaction was improved.