Numerical Simulation On Indoor Thermal Environment Of Radiant Floor Cooling With Displacement Ventilation System

In an age of science and technology changes with each passing day,society and economy develops at full speed. The comfort and indoor air quality of air conditioning is also increasingly demanded. As traditional single air conditioning system exposed drawbacks in various aspects, the current air conditioning technology is facing great challenges. As a new type of composite air conditioning system, floor radiant cooling with displacement ventilation compound system learned two respective advantages and filled the defect existing in the system of a single. In the aspects of energy saving, comfortable and beautiful advantages are a attention to the experts and scholars, and it has become a new way of comfort air conditioning. This air conditioning system has been used widely in practical engineering.,it applies not only in the small load room, but also in some of the long-span public buildings.This article adopts the method of numerical simulation to analyze an office room with the use of the composite system in Jinan, from the characteristics of the composite floor radiant cooling with displacement ventilation system. This article focuses on the effect of the indoor thermal comfort office room with the use of the composite under the condition of air conditioning systems in summer. It respectively established the physical model and mathematical model of office room, and calculate the indoor cooling load in the worst case. It designed the design parameters of a typical working condition according to the requirements of comfort, and analysis on the typical working conditions of indoor comfortable effect by using Airpak software simulation. It studied the influence of indoor thermal environment of the hybrid air conditioning system, when the cooling parameters change and analyzed the indoor temperature field, velocity field, the change of relative humidity and thermal comfort index. The results show that the floor temperature, supply air temperature and air speed change will affect the indoor thermal environment. In order to ensure the room a good comfortable effect, composite system and cooling parameters should be controlled in a reasonable range, and on the premise of satisfy the indoor comfort, to minimize the supply air velocity. Results show that the intensity of change will affect the indoor temperature distribution and velocity distribution, in turn, affect the comfort of personnel, and the change of the heat source position has certain influence to the velocity field, but the indoor temperature field change is not obvious.This paper will also be another compound air conditioning system:floor air supply under composite roof radiant cooling system with the compound floor radiant cooling with displacement ventilation system is simulated. Under the premise of floor board air supply and displacement ventilation bear the same load, it analysis the two kinds of compound air conditioning mode of indoor thermal environment. Research shows that:floor board air supply compound roof radiant cooling system is similar to mixing ventilation in terms of indoor temperature distribution and air distribution, and it is worse than the floor radiant cooling-the complex system of displacement ventilation in the aspect of comfort.