An innovative and potentially energy efficient approach to ventilating and cooling buildings is represented by hybrid ventilation. Discusses the application of hybrid ventilation strategies to building design in the USA.
States that 80% or more of infiltration is due to the many imperfections designed into the building envelopes. Discusses the problem and the role of ANSI/ASHRAE Standard 62-1999.
Many occupants of a Swedish office building reported symptoms typical of sick building syndrome (SBS). A questionnaire was constructed to rate occupants'
This study discusses the results of site measurement and surveying for IEQ in several of Shanghai's multi-storey buildings. It shows that there is no connection between data from objective measurements and surveys of office workers in questionnaires. Indeed in some cases the results were completely contradictory.
This study investigates the viability and cost effectiveness of natural ventilation in Istanbul. A typical high-rise office building was used for the investigation together with detailed local weather data including average temperature, wind speed and wind directions for each month of an average year. Data and methods provided by ASHRAE is used to calculate the air pressure at a particular window taking into account wind speed and direction, outside temperature, height and the building's location. The study uses a simple computer program to do this.
The effectiveness of personalized ventilation based on air movement around a room's occupant largely depends on the supply air terminal device or ATD. Five different ATDs were tried and compared. A normal office workplace with a desk and mounted ATDs was simulated in a climate chamber. An office worker was simulated by a breathing thermal manikin. Tests were performed at various air temperatures of 26C and 20C and personalized air temperatures of 20, 23 and 26C provided by the ATD. The flow of personalized air was increased from less than 5 L/s up to 23 L/s.
Many buildings in Austria experience poor indoor climate states and critical states of their construction. Possible causes of the high moisture content of indoor air might be bad ventilation or high moisture content of the buildings because of rising damp or weathering. Retrofitting is needed to increase indoor climate comfort levels. It is essential when designing the retrofitting to understand and predict the influences of different actions on the building's indoor climate and behaviour.
In an office renovate one year previously, a study of perceived air quality, sick building syndrome symptoms and subject performance was made. Thirty one female college age subjects were exposed to the conditions in the same office with an outdoor airflow of 280 m3/h and 45 m3/h. The subjects assessed perceived air quality and SBS symptoms while performing simulated work. Formaldehyde and VOC measurements were much higher in the room with lower ventilation rate, though no significant difference was noted in odour intensity.
Considers how ventilation provision affects the indoor air quality in tropical climates, and the energy aspect. Describes a series of research projects aimed at obtaining a detailed database of IAQ, ventilation and energy measurements, carried out in Singapore in the mid to late nineties. Obtained the overall energy consumption of a dedicated air handling unit that served the zones in which the relevant IAQ and ventilation measurements were done. Presents the results for five air conditioned buildings in Singapore.
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