English

The application of Computational Fluid Dynamics (CFD) for ventilation research and design of ventilation systems has increased during the recent years. This paper provides an investigation of direct description of boundary conditions for a complex inlet diffuser and a heated surface. A series of full-scale experiments in a room ventilated by the mixing principle have been performed for validation of the models. The experimental results include measurements of temperature as well as measurements of velocity and turbulence by Laser Doppler Anemometry (LDA).

The conditioned air is an important element in healthcare applications. One of the main objectives of supplying conditioned air to healthcare facilities is to create proper comfortable combination of temperature, humidity, and air motion as well as to remove airborne bacterial, microorganisms, and air contaminants. So the air distribution must meet specified conditions of air change rates, velocity, pressure, cleanliness, temperature, humidity, and noise level.

In this paper, the distribution features air-conditioning temperature field are discussed with numerical simulation methods for semi-opening large space building. Important influential factors, such as ambient air parameters space characteristics of semi-opening large space building and the method and parameters of air distributing, are presented.

The paper simulates the airflow and temperature fields in a dome Shanghai International Gymnastics Center (SIGC) at one summer day with the computational fluid dynamics (CFD) software PHOENIS. The comparisons of indoor vertical temperature distributions show that the predicted results are in good agreement with the on-site measured ones. And some analyses on the thermal characteristics in the actual dome are carried out.

Natural ventilation can be an effective measure to minimize building energy consumption and to improve indoor air quality. This study focuses specifically on buoyancy-driven single-sided ventilation design using computational fluid dynamics (CFD) techniques. Simulations are performed for a student dormitory under typical conditions of outdoor temperature, cooling load, and opening size by use of an indoor stack model and a combined indoor and outdoor stack model. The simulation results are also compared with semi-analytical solutions.

In this study, the effects of internal partition on ventilation performance in terms of room air change efficiency and ventilation effectiveness were investigated. A model test room was used and the physical test conditions were simulated numerically by using a CFD (Computational Fluid Dynamics) code under isothermal conditions. The test room was ventilated in mixing mode and different partition configurations, including its location, height and gap underneath as well as the contaminant source location, were examined.

A dual-mode demand control ventilation strategy was developed targeting at using in institutional or similar buildings where the number of occupants varies frequently. One occupant-related and one non-occupant-related indoor contaminants were used as the indication signals to control the fresh air intake. The first contaminant is carbon dioxide, which is a good surrogate gas for bio-effluent and the second is radon which is non-occupant-related and had been identified as a major indoor air pollutant in some buildings in the university where this project has been carried out.

Environmental control of basement by heating and dehumidifying the air is widely used in summer. In general, ventilation can make the air more humid. From the point of view of energy saving, it is suggested to exchange humidity and to insulate heat between stale air and fresh air during ventilating basement. To improve the efficient of the exchanging system, the characteristics of heat and mass transfer of membrane device are studied. It is presented that the membrane device exchange system not only can keep the heat but also can remove moisture of the fresh air.

This study utilizes Computational Fluid Dynamics (CFD) and particle tracking procedure to study the effects of ventilation system and ultraviolet germicidal irradiation (UVGI) on minimizing the risk from airborne organism in isolation rooms.

This paper assesses the performance of the ventilation system as applied to a typical patient room using Computational Fluid Dynamics technique (CFD) coupled with the calculation of various ventilation indices.