The investigation of the performance of a floor-supply displacement ventilation system with swirl diffusers or perforated panels under a high cooling load situation (90W/m2). Was the objective of this research.Measurements and numerical simulations using a CFD program were carried out to evaluate the performance of the system for a large workshop.That study ranks the impacts of several parameters, such as the air change rate, number of diffusers, and arrangement of exhaust, on the indoor environment

The hybrid ventilation for the independent building has many advantages that are presented in this paper, among them : no recycle ventilation system, reduction of the pollution, energy saving without air quality decreasing.And this type of ventilation system can work with radiant heating (or cooling) .

This paper discusses indoor air quality considerations for office spaces when using VAV system. that provide various supply air rate according to the space loads, especially in multiple spaces, served by a common air handling unit. The ventilation rate procedure and the indoor air quality procedure (the monitoring contaminant concentration method) are used in order to ensure the indoor air quality. A design solution and ventilation control strategy at the fixed outdoor air rate for indoor air quality is provided.

In pharmaceutical laboratory, the discharge of a poisonous gas by the draft chamber with high-speed responsive VAV exhaust device is necessary, but it is then difficult to maintain constant the indoor temperature. The room temperature control characteristics are analysed in that paper using CFD simulations coupled with the zone outlet temperature control simulations.

This paper compares different kinds of supply air jet that produce different air distribution in the same room. Indoor thermal comfort conditions are investigated. Measurements and calculations were made . The results were analyzed and compared to provide some valuable conclusions for application in an air-conditioned room with different kinds of supply outlets..

The aim of the project is to study the technical and physical conditions required to ensure satisfactory ventilation in schools with fan assisted natural ventilation . Analyses of the air flows for different combinations of outdoor climates were made. A model was built, the computer calculations with the program PFS and full-scale measurements in school buildings have allowed the study of the performance of the ventilation system in combination with the building. .

A special stategy must be applied to optimize the ventilation rates required in Korean classrooms. The aim of that study was to identify concentration decay by infiltration in a classroom at recess periods and to suggest proper ventilation rate to improve IAQ in the classroom. Classrooms of three schools were evaluated and the results show many interesting aspects of concentration decay patterns affecting door opening at recess period.

A new ventilation control strategy based on the Multiple Spaces Equation is developed in order to take into account the actual number of building occupants. That strategy is evaluated under steady-state and dynamic conditions of the HVAC system.

Data centers need good air conditioning systems that maintain the temperature around the equipment. The use of VAV variable volume air conditioning in that data centers is The paper focuses on the saving of energy consumption with VAV systems installed in data centers.

For that study , three different ventilation systems for typical single family houses in the Nordic outdoor were compared in order to investigate the resulting energy use and life cycle cost for each of them.The three types of ventilation system are : exhaust ventilation, exhaust and supply ventilation with heat recovery and exhaust ventilation with heat recovery through a heat pump connected to the exhaust air.