Design And Simulation Research On Combined System Of Radiant Ceiling And Desk Task Air-conditioning Based On Evaporative Cooling

The combined system of radiant ceiling and task air–conditioning based onevaporative cooling， high temperature cold water and fresh air are produced withevaporative cooling air condition and respectively transported to room’s radiationterminal and task air–conditioning.Indoor sensible heat are eliminated with radiationend and humidity load are removed by task air–conditioning，This combined systemare classic dedicated outdoor air system，rooms appear the whole environment and thepart environment， the whole environment（ambient area）and the part environment（task area）are separately controlled，and specially stress the task area，Fresh air areimmediately transported to personnel breathing zone，the superior air quality，To solvethe problem that personal control their part environment according to their own needsand improve the satisfaction rate for indoor comfortable，the evaporative coolingtechnical produced high temperature cold water are employed by radiation end，energy saving and environmental friendly.According to the actual of applying evaporative cooling，studying on hybridradiant cooling/heating、task/ambient air–conditioning，this article introduced Thecombined system of radiant ceiling and task air–conditioning based on evaporativecooling，The theories and principles、forms、characteristics、 operational modes andApplication Ranges of this combined system are analysed，This combined system isimmediately control the temperature and the humidity and achieve district, timecontrolling，The high temperature cold water and fresh air which are produced withevaporative cooling air condition are take full used。The rooms are provided new airand everyone sharing the fresh air，and this combined system own better indoor airdistribution than traditional air condition.Build model of desktop task air condition with airpark，and compared with theexisting experimental result，proved airpark mode desktop task air condition isfeasible。simulated result and experimental result are agree，error value within the limits of demand，proved airpark mode desktop task air condition is accurate，thereare three hybrid radiant mode，choice DO mode because of the high speed ofconvergence and high accuracy one by one test.Established model of the combined system of radiant ceiling and taskair–conditioning based on evaporative cooling，simulated indoor temperature field、velocity profile、PMV and PPD. The thermal comfort and indoor air quality of thewhole room and part area are analysed.The simulated results were:1.according to the design procedure of this combined system calculated indoor speedand air volume achieve thermal comfort，the temperature field and velocity profile areuniformity，in the part area’s speed less than0.3m/s，this method of calculation isreasonable.2．After improve the temperature of desktop task air condition and hybrid radiantcooling，the environment of the room aren’t make it worse，however，the temperaturefield and velocity profile more better than changed before，achieve better comfort ofthermal and satisfaction.3. The system of desktop task air conditioning air supply temperature and theradiation roof temperature were improved that reduce the consumption of thiscompound air conditioning system，The evaporative cooling air unit the windtemperature and the high temperature water chiller water temperature were reduced，The adaptability of the area the evaporative cooling were expanded that make theevaporative cooling applied to wider areas.