The Experiment Research On Different Diffusers Influencing Thermal Comfort In VAV System

Nowadays technological fast development, the energy consumes enlarge increasingly in the industry of the production with the public life, finally,it will appear energy dried up.As we known, air condition conduct and actions are high industry , so it's important to pay attention on this problem.In our environment that initiates economy energy and comfort in 21 centuries. Variable-Air-Volume system is a kind of economy energy systems.it's necessary to research and utility this air-conditioning system With the extensiveapplication of air-conditioning technology, a higher requirement has been put forward not only on the thermal comfort but also in the thermal health on indoor thermal environment. So, this paper combines VAV system and thermal comfort, studies two different diffusers and displacement ventilation system.at the same time, compares their Thermal comfort in dissimilar conditions to find the Thermal comfort area and their the best index.This paper is baesd on a series of experiments.Vary the cold load through changing hot source form and heat quantity formation. At the same time, chang three diffuses in the room. Collect the temperature value and the wind velocity value in each experiment. Making use of the calculator software to dispose experiment dates in order to see their processing, computing several index signs, such as, work area mean temperature,the temperature grads and APDI etc. And take into analysing and comparing their indoor thermal comforts.Under the laboratory condition, the thermal comfort don't have distinct differential with square diffuser in VAV system. And showing its thermal comfort is good enough in this experiment.the exchange rate which satisfy thermal comfort area is from 6.1t/h to 15.9t/h.The thermal comfort of Slot diffuser can improve when its wind flowrate decreases,its exchange rate which satisfy thermal comfort area is from 6.3t/h to 10.1t/h.So slot diffuser can be used in small cold load conditions. However, it isn't meet thermal comfort request if it is used in large cold load conditions. Displacement ventilation has conspicuous heat lamination height and temperaturegrads. Draught Rating is the best index to evaluate its thermal comfort.its exchange rate which satisfy thermal comfort area is from 7.5t/h to 16.8t/h.