Numerical Simuation And Experimental Research Of Temperature And Humidity In Air-conditioned Room

Heating,ventilation and air conditioning(HVAC)system is a system that helps to control indoor air temperature,humidity and air quality.It is responsible of air conditioning and is one of the most important systems in modern buildings.With the rapid development of science and technology and the continuous progress of society,the requirement of resident for indoor environment are increasing.It is becoming more and more important to analyze and study the influencing factors of indoor thermal and humid environment of ventilated room,and to optimize the air conditioning supply scheme.The purpose of this paper is to study the air distribution ? temperature and humidity distribution in the air conditioning room,to explore a more effective air conditioning scheme for control of indoor temperature and humidity,and to provide theoretical foundation and practical experience for construction of a safe and comfortable indoor environment.In this paper,a physical model of common indoor air-conditioning ventilation system is studied by numerical calculation method and model experiments.A 1/10 scale model of general air-conditioning room is designed and established,based on which an experimental platform for monitoring temperature and humidity was constructed,in order to collect temperature and humidity data under several operating conditions.CFD simulation software was utilized to explore the distribution of temperature and humidity and air flow in the model under different air supply temperature,humidity and wind speed.The influence of physical properties of air conditioning on indoor thermal and humid environment was obtained.Comparing the results of numerical calculation and experiment,it is found that the results of calculation and experiment fit well,and the error is controlled in an acceptable range(temperature < 1 ?,relative humidity < 5%),which proves the reliability for the calculation model.The paper also establishes a numerical calculation model for operating conditions with indoor heat and humidity sources,and simulates the temperature and humidity distribution under different air supply modes(the same side up-supply-down-return,the same side up-return-down-supply,the different side up-supply-down-return and the opposite side up-return-down-supply).By comparing the simulation results,the general rule of enhancing indoor heat dissipation and humidification effect is discussed.Finally,a numerical calculation model is established for the refrigeration and heating conditions of general-sized air conditioning rooms.The indoor environment is simulated under different air supply modes and different cold return air ratios.The temperature-humidity control effects of different air supply modes under refrigeration or heating conditions are discussed,and the application of secondary return air system to improve the air conditioning effect is verified.At the same time,according to the requirement of indoor humidification in winter,the effects of local humidification and centralized humidification are compared,and the optimum scheme of humidification based on domestic humidifier and secondary return air system is put forward with advantages of low energy consumption and better humidification effect,which provides technical basis for maintaining the stability of indoor thermal and humid environment and reducing energy consumption.