The Field and Laboratory Emision Cell (FLEC) was presented for the first time at the Healthy Buildings Conference in 1991. The FLEC is now used worldwide for many different applications that are related to emission testing of building products. Several labelling schemes are now on the market using both the FLEC and more classic climate chambers to fulfil the increasing demand for more indoor environmentally friendly building products.
In order to explain the effect of ventilation systems, the article presents the results of investigations made on a simulation program to calculate the temperature, heat loads, ventilation rates and indoor air quality. The study considered the Japanese daily schedule and the residents behaviour in regard to maintaining comfort. The indicators of indoor air quality were taken to be carbon dioxide, carbon monoxide and formaldehyde concentrations. Three systems were analysed: basic passive ventilation system, a passive stack ventilation system and a mechanical ventilation system.
Describes how a nodal model was developed intended to represent room heat transfer in displacement ventilation and chilled ceiling systems. Precalculated air flow rates were used to predict the air temperature distribution and the division of the cooling load between the ventilation air and the chilled ceiling. A network of ten air nodes is used to separately represent the air movements in the plumes and the rest of the room. Calculation of the capacity rate parameters is done by solving the heat and mass balance equations for each node using measured temperatures.
Simulates a kitchen for a study of indoor air quality. An extractive FTIR technique was used to measure combustion products from unflued combustion from a gas cooker in a ventilated room. On a comparison of the results with those from conventional instruments, the FTIR technique showed good agreement. The study incorporated the obscuring of the spectrum due to the effects of H2O and carbon dioxide and detection limits. The conditions in the room were investigated using CFD.
States that when used with ice storage systems, cold air distribution systems are popular since they require less operating and capital costs. Stresses the importance of a consideration of occupant comfort. The study looked at air circulation and temperature distribution in a room, considering different orientation, velocities and sizes of jet for a given vertical location of air inlet and outlet on opposing walls. A control volume method was used to solve the Navier-Stokes equations and an energy equation in two dimensional rectangular Cartesian coordinates.
In Switzerland, even if the average daily temperature rarely exceeds 25º C during the summer months, more and more cooling plants are being installed in administrative buildings. The CUEPE participated as experts in some realisations that showed (simulat
Discusses methods of overcoming the limitations of algebraic equations with small-scale physical and network flow models, as well as computer-based zone and CFD models.
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