Research On System Optimization And Heat Transfer Characteristics Of The Hybrid System With Radiant Floor Cooling And Dedicated Outdoor Air

Under the background of the global energy crisis,building energy conservation has become the inevitable trend of building development in the world.The hybrid system with radiant floor cooling and dedicated outdoor air was born as a new air conditioning system under the tide of the times.Based on the principle of independent control of temperature and humidity,the hybrid system can not only overcome the shortcomings of traditional air-conditioning system to achieve the purpose of energy conservation,but also play a role in improving indoor air quality.However,the research of the hybrid system has a relatively slow start in China,and there are still some problems in engineering application.The research of this paper can provide solutions to the application problems of hybrid system,and it aims to give theoretical help to its application in domestic engineering.This paper summarizes the causes of indoor thermal environment problems and surface condensation of the floor mainly include two aspects.On the one hand,surface temperature of the floor is too low and the cooling parameters are not correct.On the other hand,inappropriate behavior of residents is also an important reason.In order to improve the indoor thermal environment,orthogonal test was used to analyze the relationship between the air conditioning parameters and condensation temperature,average radiation temperature,PMV,also the work area temperature difference.Select PMV and work area temperature difference as judgment indexes,the optimum design of the system is as follows: surface temperature of the floor is 23.5 ?,air supply temperature is 22 ?,relative humidity of the air supply is 50%,and air supply speed is 0.7m/s.The influence of coil spacing,water supply temperature,decorative layer,interior design temperature and filling layer thickness on the average temperature of floor surface was obtained by ANSYS finite element method.Depending on the sensitivity of the floor surface temperature to each parameter,the optimal scheme of floor design parameters is obtained.The results can provide theoretical support for adjusting surface temperature of the floor during the process of engineering optimization.