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.

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 paper presents a stochastic single zone model for a hybrid ventilated building. Wind pressure and stack effect are used to drive air through the enclosure assisted by a fan in case of insufficient natural driving forces. Based on Monte Carlo Simulation, the model calculates the time varying airflow rate considering the random nature of input. An important aspect when considering stochastic models for hybrid ventilated buildings is the control strategy. The airflow in the present model is controlled by a damper and a fan using a PI controller.

This paper investigated design methods of utilising tunnel air for ventilation and prediction methods of distributing state for indoor thermal environment utilizing tunnel air for ventilation in one year in an office building, provided a series of program for design and prediction, and performed verification for a concrete engineering example.

Multizone modelling is a way to determine the air flows in a complex ventilated building subject to internal and external loads. The purpose of this work is to consider and quantify the influence of randomness in the load parameters, which is accomplished by means of a stochastic multizone model. In the first place a deterministic multizone model is applied. The model is capable of predicting air flow and pressure distribution within a building divided into an arbitrary number of zones and flow paths. The air flow is driven by pressure differences due to wind and stack effect.

Electrical energy consumption in the northwest region of the Mexican Republic during the summer, is the highest of the country, due mainly to the use of mechanical refrigeration systems that are used to condition the interior of the housing and other buildings as a rule. It is shown that it is possible to condition the interior of a house by passive means in a hot dry climate during the summer, through the use of massive walls, evaporative cooling and solar radiation shield systems on the roof.

Currently, in the design of new buildings and retrofit of old buildings, attention is turning towards a more integral energy design with focus not only on thermal insulation and airtightness but also on optimal use of sustainable technologies such as natural ventilation. There is a tendency for buildings to be designed in order to utilise the outdoor environment to create an acceptable indoor environment, whenever it is beneficial. Passive ventilation and natural cooling are sustainable energy efficient and clean technologies.

The new office building of the Ministry of Transport at Terneuzen in the Netherlands is a sustainable and energy efficient building with a good indoor environment. The building is constructed of sustainable materials, well insulated, has a good daylight situation and is equipped with a minimum of building services. Passive and natural sources have been utilised as much as possible. An advanced natural ventilation system provides the fresh air and controls the thermal comfort.