Study On Design Of Capillary Air-conditioning System

While energy-saving, environmental protection and health issue have become .the direction of today's HVAC word, researchers, engineers and manufactories put more and more attention to this target. Capillary plane radiation air-conditioning system, which based on the independent temperature-humidity control, has overcome the inherent disadvantages of conventional air-conditioning, not only use of natural cold source and industrial waste heat efficiently, but also can provide a good thermal environment.Based on the analysis of research status of radiation air-conditioning at home and abroad, issues about energy-saving design, cool load simulation, radiant asymmetry and ventilation system(including both Displacement Ventilation, Dedicated Outdoor Air-conditioning System) are anglicized and simulated by CFD. Finally, through experiment to further verify the reliability of numerical simulation results provided a theoretical and practical basis for its application.Firstly, based on value and extending condition of capillary air-conditioning system, and china's climate subarea condition, analysis the Usage of this system and has given corresponding air-conditioning schemes.Started with the capillary phylogeny secondly, summed up capillary plane radiation air-conditioning system applying condition in Europe, North America and Chinese project and analyzed system compose and their characteristic. Then, discussed the composition, working principle and advantages of the capillary plane radiation air-conditioning system. And used the exergy analysis and thermodynamics second laws when heating and cooling. Drawn the conclusion that capillary plane radiant heating system could put important effect on chiller system, transport system and chilled water system.Thirdly, takes radiation asymmetry as the breakthrough point, compared with conventional air-conditioning, when have the same comfort, came to the conclusion that indoor calculated temperature of the capillary radiation air-conditioned room is lower when heating in winter and is higher when cooling in summer than traditional air-conditioned room, and premises and heat transfer principle behind this change. Then use CFD technology to simulate quantity of heat in asymmetric long wave radiation, and have revealed the radiation asymmetry effect to the human body quantitatively. Through three project examples finally, analysis effect degree of this change to the load of air-conditioning system.Fourthly, taken the mission that wind system bears as starting point, and studied the characteristic and relevance Europe and America design specifications about two kinds of ventilation system (DV and DOAS), which could be used with capillary system to dehumidification. Then set up a physical model and use CFD technology to simulation study about temperature field, velocity field, PMV and PPD in the air-conditioned room with capillary plane radiation air-conditioning system.Finally, experimental study was also carried out in rooms with capillary plane radiation air-conditioning system located in Qingdao. Tested outside air temperature, indoor air temperature, relative humidity and heat flux in a test room. Through data analysis, we can see it met the requirements of thermal comfort., and the time for the capillary mat to warm up is 15minites. The hole system could be more energy-saving if change the underground pipes of ground source heat pump to capillary mat system.This subject is a sub subject of development project of science and technology in Shandong, which is "key technology research and demonstration of capillary plane radiation air-conditioning system" (Number:2008GG30006005).