This paper deals with measurement of the capture efficiency of REEXS (Reinforced Exhaust System). For the experiment a local exhaust hood was designed with the possibility of working either as a traditional circular exhaust hood or as a REEXS. Experimental measurements were done both for the traditional hood and the REEXS, with the same exhaust flow rate. The results were then compared.The results proved that the main weaknesses of the traditional local exhaust hood can be improved by using REEXS hood.
The aim of that study was to measure the performance of local ventilation for various parameter settings (nozzles and slots REEXS) and to demonstrate the benefit for real working situations.A test cabin was built, to measure the capture efficiency under reproducible cross draughts. Optimised REEXS hoods were used for the experiment : they proved to have a larger capture range compared to the conventional flanged hood. The results were so encouraging that an exhaust installation for 6 welding working places was completed.
The first part of this paper deals with the performance of a ventilated ceiling system. Field measurements were made in a kitchen of a dietitics school in Kyoto practising mass cooking. The kitchen was half equipped with air canopy hoods to compare with the ventilated ceiling system.
A numerical simulation was conducted with CFD in order to understand the trends of the indoor thermal environment of the kitchen.
This thesis was based on numerous experiments operated in a full-size cell in order to study ventilation efficiency and thermal comfort associated with several positions of air inlet and outlet, taking into account different sources of disturbance (heating systems, occupants, etc.).
This paper presents a complete overview of energy and indoor air quality issues related to ventilation. It comments ventilation in standards and in practice and gives information on the human response, health effects, air distribution, ventilation efficiency and different types of ventilation systems.
A personalized ventilation system located underneath the front edge of a desk was tested regarding to its ventilation efficiency using a heated mannequin and tracer gas. The air change effectiveness ranged from 1.4 to 2.7.
The contaminant emission rate is an important parameter describing the potential for materials to affect indoor air quality through the release of volatile organic compounds (VOCs). Emission rates have traditionally been inferred from gas-phase concentration measurements obtained through chamber studies. However, models suggest that the rate at which VOCs are emitted by diffusion-controlled materials may be influenced by ventilation rates.
This study was aimed to analyse the ventilation efficiency and indoor air quality in the conventional kitchens, when porous screens were installed on the transoms. Numerical simulations and laboratory full-scale experiments were carried out in the model kitchen in the Department of Architecture at National Cheng-Kung University. The influences of porous screens on the temperature fields, flow structures and ventilation rates were indicated. The "Tracer-gas Concentration Decay" method was conducted to measure the air exchange rate and the age of air in the model kitchen.
Field measurements were carried out on six office buildings in Taïwan to evaluate ventilation efficiencies on the concentration of formaldehyde and TVOC, as well as the impact of ventilation rates on reducing these concentrations.
The aim of this study is to evaluate different control strategies on ventilation in a bathroom and their efficiency. Comments are given on running time periods as well as reaction of different controls (occupation, CO2/COV, humidity).
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