Badly designed stables may affect the animals' health, but it is difficult to design a stable with acceptable ventilation rates and indoor comfort without the right tools or guidelines.For the design of animal housing facilities, the authors used the passive building simulation tool QUICK II, extended with a natural ventilation model, and an animal heat generation model.
This paper focuses on the degree of flow enhancement achieved by an atrium which is itself ventilated directly by a low-level connection to the exterior.A theoretical model is designed to predict the steady stack-driven displacement flow along with the thermal stratification in the building due to heat gains in the storey and solar gains in the atrium. Comparison is then made with the results of laboratory experiments
This paper aims at comparing calculated and measured air flow distributions inside a naturally ventilated test room. Wind tunnel trials were carried out in the test room.Separate air flow and thermal modelling programs are used to predict the spatial distribution of the air flow and thermal comfort.
Thanks to an environmental chamber equipped with a displacement ventilation system, neutral height measurements were carried out with the presence of a heated mannequin and other heat sources.The relationship between the neutral height for air distribution and the ventilation load in a room with displacement ventilation was investigated.
A new Adaptive Comfort Standard is included in the recently accepted revisions to Ashrae standard 55. That ACS permits warmer indoor temperatures for naturally ventilated buildings during summer and in warmer climate zones. It is based on the analysis of 21,000 sets of raw data compiled from field studies in 160 buildings located in different climatic zones on the 4 continents.
In that study, Volatile Organic Compounds levels found in two tropical office buildings are analysed. The concentrations have been measured under different conditions of ventilation (normal occupancy with ventilating system working, and with the ventilation system shut down).
A CFD model that incorporates fan-performance characteristics was applied to investigate and compare the air-recirculation performance of the two general designs of unidirectional-flow cleanrooms. For the simulation, typical flow-resistance models of the various components in the air path were used.
In this paper, the airflow characteristics in the outlet region of a generic vortex diffuser are experimentally and numerically investigated. A specific arrangement of tetrahedral and hexahedral cells was used in grid generation: it has been found ideal for the analysis of the room air movement due to an air diffuser.
Corresponding airflow measurements were conducted by using a three dimensional ultrasonic anemometer.
A supervisory control scheme for a sensor based demand-controlled ventilation system is described in this paper. The strategy based on neural network models is used to diagnose the measurement faults of outdoor and supply air flow sensors, and makes the fault-tolerant control of outdoor air flow when faults occur. Tests using that dynamic system simulation have been conducted to validate the strategy.
Starting from models library, a zonal model of an entire building can be constructed by assembling the appropriate modules. A model-generating tool called GenSPARK makes the process automatic. This paper describes how that tool works and give examples of configurations that can be analyzed.
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