This paper presents a summary based on 3 articles published in 2005 by the authors about the quantitative influence of indoor climate on productivity.Illness or sick leave prevalence vs. ventilation rate is shown from a model taking into account particles in indoor air. Results are compared with those of other bibliographical sources.Results also concern workers performance as a function of ventilation rate, perceived air quality or indoor temperature.Other date are mentioned about the relationship between sick building syndrome symptoms on occupants performance.
A numerical simulation and experimental measures were made on a prototype specially built for that study of a new system of air distribution inside an hospital railway coach.For the air injection into the carriage, high-induction terminal, in particular micro-jets terminal has been employed. Simulations are in adequacy with values obtained with the experimental measures on the prototype.
For that study, a mathematical analysis is applied graphically and quantitatively to investigate the multiple steady state behavior of combined buoyancy and wind driven natural ventilation system.The necessary conditions for that multiple steady states to exist are investigated along with the impact of initial conditions on the final state of the system.
This paper focuses on the methods for an efficient use of upper openings in large space buildings in Shanghai International Gymnastics Stadium. A huge improvement of the energy saving is due to the use of natural ventilation.The results of the approach may instruct the design of the thermal environment and the effective operation of air-conditioning systems in large space buildings.
Urgently, bio-hazardous air cleaners had been developed in Taiwan hospital to control the Severe Acute Respirator Syndrome (SARS).The building up and the fuming gas decontamination of bio-hazardous air cleaners are illustrated in this paper along with the retrofitting of the HVAC system of respiratory isolation room.
To protect the workers from stress with radiation heat in workshops, a study of the environment thermal state has been carried out. A local air supply to the workplace was provided through an air shower located either above the workplace or close to its floor. Operating measurements of thermal conditions were made along with an evaluation by using the WBGT(wet bulb globe temperature) index.The results of measurements and flow visualization show that the upper air shower is more suitable than the lower one.The optimum local air supply for hot workshops has been designed.
The vortex ventilator (VV) is a new concept of local exhaust ventilation system. In this paper the capture characteristics of the vortex ventilator are evaluated with both respect to the capture efficiency and to the capture velocity.3D CFD simulations are performed along with experiments using the tracer gas method with SF6.Comparison with the simple suction is made. The results of the VV are presented.
In this paper, the numerical methods are first validated by experiments, then a seated computational thermal manikin (CTM) is used to carry out the parameters study of Personalized Ventilation .The modeling outcome shows that in a stagnant environment, the human body is enclosed by the thermal plume and its intensity is affected by the room air temperature.To tear away the thermal plume at the windward side of the human body, a uniform airflow in the horizontal level with a O,2 m/s speed is strong enough.
For that study, experiments are conducted to develop a new breathing ventilator using the concept of alternating-current (AC) ventilation. That ventilator is composed of a reversible fan and a thermal storage medium. In order to obtain the air change efficiency of a room by AC ventilation, numerical simulations are performed .
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