Design On Tubular Cooling Radiation Ceiling And Simulation Study Of Indoor Thermal Environment

This paper introduced a kind of tubular cooling radiation ceiling air-conditioningterminal devices combined with interior decoration. Elaborated on the design ideasand structural feature, established corresponding mathematical model of heat transferand analyzed the influence of the radiation cooling performance for radiation tubebased on different design parameters including tube diameter, water temperature, inletwater velocity. At the same time through the establishment of the numerical model,the indoor thermal environment of a large office was analyzed installed this kind oftubular cooling radiation ceiling combined with dedicated outdoor air system.According to the simulated result of indoor temperature and velocity field distribution,the percent dissatisfied on vertical temperature difference between the head and ankle,drought risk percent, predicted mean vote and predicted percentage of dissatisfiedwere compared and studied. And then the applicable occasions and applicationprospect of this system was proposed.Conclusions are concluded．Firstly, refrigerant temperature rise inside the radianttube was negatively correlated with water temperature and flow velocities, and waspositively correlated with tube diameter. Influence degree declined one by one fromtube diameter, inlet flow velocities to water temperature, Secondly, the numericalsimulation of indoor thermal environment showed: indoor temperature and velocityfield distribution was mainly affected by the layout and form of the fresh air inlet, airvelocity, the external structure, indoor heat source and cold radiant ceiling. Theaffected zone of cold jet flow Located in the room on the length direction1/3to2/3area, width1/2to3/4area for temperature velocity field distribution. Thirdly, basedon the related thermal comfort index analysis results in personnel activity area, mostpeople feel thermal comfort. In addition, in view of strong radiant ceiling coolingcapacity of this kind of tubular cooling radiation ceiling, the indoor overall thermalsensation is cooler, Therefore it shows that the system has great practical potentialcombined with interior decoration ceiling in a large space.