The Simulation Research Of The Thermal Environment And Dehumidification For Displacement Ventilation With Cooling Ceiling System

The displacement ventilation with cooling ceiling system is an economical, energy-saving and comfortable air-conditioning system. It combines advantage of displacement ventilation system in improving indoor air quality(IAQ) with characteristic of cooling ceiling system in improving thermal comfort, has been attracting extensive attention and application in and abroad.In this article ,indoor thermal environment and the problem of ceiling condensation in the beginning of the system are studied by simulation research for displacement ventilation with cooling ceiling system, simulates and analyses the temperature field and relative humidity field, presents concept of the attached layer of the ceiling, analyses the variation rules of the temperature field and relative humidity field of the attached layer and the working area, calculates and compares the dew point temperature of the two areas, and points out the feasibility of replacing the dew point temperature in attached layer with the working area's.To solve the ceiling condensation in the beginning of the displacement ventilation with cooling ceiling system, this article improves the original operation system as follow: divides the single operation process into initial operating stage and normal operating stage. Studies and analyses the variation rules of the temperature field and relative humidity field for the two stages, presents running time of the displacement ventilation system which runs before the whole system, fits the relationship between dew point temperature in attached layer and system run time of the initial operating stage, and studies variation of the dew point temperature in attached layer for the normal operating stage. Finally, verifies the operability of the improved method by analyzing PMV-PPD indoor .