Application of night cooling to educational buildings looks very promising in mild climates. Night coolingstrategy performance in a school building to be realised in Italy during 2008 has been studied by meansof a commercial CFD code.Due to the symmetry of the building, first a 2D numerical model consisting of a vertical section throughthe three-storey building has been developed. The CFD model includes the solid zone describing theconcrete structure.
The energy penalty associated with the conditioning of large quantities of outdoor air in hot and humidclimates is well known. The problem is even more challenging when the application involved requires100% outdoor air. This is the case in an animal care facility, which houses different species ofanimals that are used for laboratory experiments in the field of life sciences. In such cases, it iscrucial that energy conserving HVAC systems be explored.
Using a passive tracer gas technique, 1 and 2 week averages of local mean ages of air have beenestimated in an occupied detached single family house in mid-Sweden during one year. In this paperthe measurement result is compared with the result of transient simulation of ventilation using theCONTAM program. The simulation shows that the whole-house air change rate is dominated by theinfiltration due to mechanically created pressure difference as long as the outdoor temperaturedifference exceeds approx. 10 C.
The growth of automobile population in Kuala Lumpur is an important issue for car parking spacesespecially commercial buildings. The large multi storey and underground car parks seem to offer goodsolution nowadays. Undeniably, indoor air quality (IAQ) is a vital element in the underground car park. Itis so important due to its effects to the human beings.
With radiant heating, it is possible to set room air temperature lower than when heating withair-conditioning because the human body is heated by a radiation. As room air temperature decreases,heat loss from walls and windows decreases, and so does the ventilation load. It is often said that theradiant heating, such as floor heating saves energy. This study calculates heat flow at the windows andthe walls of a living-room using computational fluid dynamics (CFD).
It is necessary to unsteadily accurately estimate handling and time-related spatial distribution of theindoor environment element in respect of externality meteorological phenomenon and time-varyingmovement of the heating and cooling load in order to carry out the thermal environment design in detail.With the speedup of the recent computer, the unsteady CFD calculation was practically carried out andresults fed back to the environmental design.However, time subtraction interval and convergence decision are appropriately set at the case of theunsteady analysis, and it is necessary to examine
The effectiveness of natural ventilation, i.e. its ability to ensure indoor air quality and passive cooling ina building, depends greatly on the design process.
Use of a portable HEPA filter cleaner in a room is believed to be capable of reducing the risk oftransmission of infectious diseases through removing the particles or large droplets to which pathogensare attached. It is hoped that the portable HEPA filter(s) can increase the effective air change rate (forparticle removal only) in a general ward to the ventilation standard of an isolation ward for emerginginfection diseases when there are insufficient number of isolation wards.
To reduce the concentration of volatile organic compounds (VOCs) and formaldehyde emitted frombuilding materials and furnishings, it has been suggested that new buildings undergo a bake-out.According to the existing studies [3, 4], ventilation during a bake-out is believed to be essential forreducing the concentration of indoor air pollutants. For a practical use of bake-out, several ventilationstrategies such as natural and mechanical ventilation can be considered.
A floor heating, so called ‘Ondol’, is widely used in korea, and it has been known that Ondol provids good thermal environment. [1] However, the impact sound through floor is great and ventilation rate depends on infiltration in rooms where the Ondol is a
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