A study was made of the time dependence of the emission of organic compounds from a polyamide floor covering with styrene-butadiene-rubber backing in three climate chambers at 23 deg. C and 45% relative humidity. Volatile compounds such as toluene reach a maximum concentration of the gas phase in one hour, decreasing to less than 2% in 60 hours, while less volatile compounds decrease slowly over several months. Observed concentration do not depend on the chamber size, the wall material and air velocity provided the chamber is well mixed and a defined chamber loading is maintained.
In a laboratory chamber experiment, acoustic and thermal fibreglass insulation materials used in HVAC systems were colonized with fungi, which produced odour-giving volatiles. Suggests that these volatiles may be implicated in experience of indoor air quality and sick building syndrome symptoms.
Summarises the results of product analyses and a series of small chamber emissions tests on alkyd paint. Also describes the use of a mass balance approach to evaluate the impact of test variables and to assess the quality of the emissions data.
Hybrid ventilation systems may consist of a combination of natural ventilation for air supply and a mechanical exhaust system. The quality level of thermal comfort is influenced by e.g. the way of air supply, the heating system at the facade and internal heat loads. This article deals with these parameters and their influence on the indoor climate based on research in climatic chambers.
A large-scale model of an attic construction has been built in a climatic chamber. The purpose of the attic test model is to investigate hear transfer-in particular, heat transfer by convection-in loose-fill attic insulation. The influence of a number of factors on heat flows can be investigated using the attic test model; for example, insulation thickness, attic ventilation, ceiling construction, roof slopes, and the quality of installation workmanship. The heat flow through the attic ceiling construction is measured with a metering box.
The paper presents results of interlaboratory comparison on the emission of formaldehyde from mineral wool board. Eleven laboratories took part in these studies. The results showed significant variances between laboratories. The discrepancy was related to the chamber conditions and sampling
The performance of four types of heat-pipe heat recovery unit for naturally ventilated buildings was determined in terms of effectiveness and pressure drop. The effectiveness of the heat recovery units was tested in a two-zone chamber. The pressure loss characteristics of the heat recovery units were determined using computational fluid dynamics (CFD) and experimental measurement. CFD was also used to evaluate the performance of a solar chimney for heat recovery in naturally ventilated buildings.
Models are presented for describing the performance of room air cleaners in removing pollutants from indoor air, particularly the levels of removal that can be achieved in practice. Controlled levels of pollutant were generated in a room environmental chamber, and the performance of a commercial room air cleaner was assessed according to the models. The room environmental chamber was operated in static (sealed) or dynamic (ventilated) modes.