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Numerical Simulation Researches on Air-Conditioning with Supply Air at Washboard in Office

Author: JiWanQin
Tutor: LeiBo
School: Southwest Jiaotong University
Course: Heating,Gas Supply, Ventilation and Air Conditioning Engineering
Keywords: supply air at washboard airflow organization velocity field temperature field numerical simulation
CLC: TU831
Type: Master's thesis
Year: 2009
Downloads: 12
Quote: 0
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Abstract


In recent years, with the development of production and living standards, air-conditioning systems in buildings has been widely used, in order to improve the comfort in the rooms, engineers pay more attentions to the airflow organization which is one of the most important parts in air-conditioning. Traditional air supply adopt blowing from the top mostly, however, supply air at bottom is favored by engineers at home and abroad with its obvious energy saving effect and improvement of air quality.In this paper, in allusion to an office room with supply air at washboard, adopt the commercial software Fluent to calculate the airflow organization, when the mathematics model was founded, some conditions were taken into account such as outdoor temperature, structure of enclosure, office equipment, occupants indoor and illuminations, for the sake of approaching the real conditions and ensuring feasibility and veracity of simulation. Nervier-Stokes equation is the governing equation of the computation and standard k-εtwo equation turbulent model is employed, take in count of the buoyancy caused by the difference of the temperature, Boussinesq model is used. The finite volume method is used to discretize the computed area. When dealing with the boundary condition in the area near the wall, the wall function is adopted. In addition, the second order upwind differencing scheme is used in the computation. And the SIMPLE algorithm is adopted to compute the energy equation. Obtain the temperature and velocity field of the room at different operating mode, compare the result and summarize.This dissertation analyzes the computational results under two kinds of airflow organization schemes、two kinds of heat sources in details, The distribution characteristics of the temperature field and velocity field are also analyzed and the reasons why the fields are formed are pointed. Furthermore, the dissertation studies the effects of temperature, velocity to the air distributions and thermal comfort. The research results show that discharging air from the top is more easier to realize the satisfactory air distribution; adopting this kind of airflow organization schemes can properly elevate the temperature of supply air; have remarkable energy-saving benefit.Finally, make a potential analysis on engineering application of supply air at washboard.

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