Dissertation > Industrial Technology > Building Science > Housing construction equipment > Air-conditioning, heating, ventilation,and its equipment > Air-conditioning

The Experimental Study on the Performance of Air Supply of Partition-type Task-ambient Air Conditioning in Office Space and the Numerical Simulation of the Airflow Distribution

Author GaoJiaJia
Tutor LiuGang
School Donghua University
Course Heating,Gas Supply, Ventilation and Air Conditioning Engineering
Keywords task-ambient air conditioning partition-type air supply thermal comfort air quailty numerical simulation energy saving
Type Master's thesis
Year 2009
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At present,the traditional air conditioning targets to the whole room as the adjusting object,do it’s best to create a stable thermal environment,this environment targets neutral thermal sensation as the goal.However,long time life in this kind of comfortable environment,the human realized has problems such as sick building.Task-ambient air conditioning(TAC) has gain concern for the comfort,healthy and energy saving.As one type of the TAC system,Partition-type TAC applies to the open office space.As its nozzles located on the partitions among work units are close to the people,so there need more discussion about the comfort of the TAC system.The supply nozzles and the property of the supply air including temperature and volume will effect its thermal environment and energy consuming.Based on the major means of numeric simulation and lab test,this paper studies the airflow distribution and microenvironment assessment of TAC system according to the typical TAC system in office building.Airflow distribution,Thermal comfort and IAQ of work area and other areas in room under the TAC system and when it is running in different seasons and different blowings ways are investigated by CFD commercial software Airpark.A workstation simulating a typical office desk with partition-type TAC system is established in a controlled environment chamber to research the performance of TAC system in transitional seasons.Results from tests are compared to those from numerical simulation which proves the feasibility and the veracity of simulation experiments.The paper surveys the regional office layout and the air-condition classification in modern office buildings,detailedly studies on the control method and the basis of various aspects when TAC system being used,Establishs a mathematical model in accordance with typical office building,calculates the total consumption of chilled water and cooling water,compares the consumption between the TAC system in company with background air conditioning and the traditional system,and finally educes results that the former can be able to reduce energy consumption.Conclussions obtained by test,simulation and model analysis establish stable basis for predicting,analysing and evaluating air distribution of task-ambient air conditioning.

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