Condensation and mold problems have been identified as one of the severest IAQ problems in Japan. Especially in the wintertime, moisture condenses on cold wall surfaces where it can cause deterioration of the building materials and mold growth related to allergic symptoms. This paper discusses the possibility of using the CFD method to solve condensation problems.
Firstly, a CFD model for simulating condensation is developed, and then the validity of this model is examined experimentally.
The balance between the energy efficient thermal comfort and Indoor Air Quality (IAQ) in healthcare facilities is the main of this paper. The present paper will present this balance from the viewpoint of the air conditioning design. It was found that the design of the HVAC airside systems plays an important role for the energy consumption optimizations and achieving the optimum IAQ. This paper highlights the importance of the proper airside design on the energy consumption, thermal comfort and IAQ.
The present paper addresses and fosters the factors that affect airflow movement and energy efficiencies in the surgical operating theatres. The present work puts forward analyses for major factors contributing to failure to achieve and attain the optimum Indoor Air Quality (IAQ), and the methods suggested to solve such problem. Appropriate architectural and mechanical engineering recommendations to achieve the optimum hygienic operating theatre are set out in the paper.
For that study, a classroom was modelled and a comparison of the performances of a specific hybrid ventilation system with a traditional mechanical system in terms of thermal comfort, indoor air quality concerning the CO2 concentration and energy consumption was made. The experiment was performed in different French cities, it permitted to draw some conclusions about the potential of such an hybrid system according to the main climate characteristics.
This article is a study of the air quality at a bus terminal. Presence and concentration of indoor air quality indices were determined by field surveys and sampling. Bus emission rates, occupational exposure and ventilation requirements to have a correct indoor air quality were simulated by mathematical model.
The results show that the natural ventilation rates are too low for having a good indoor air quality, and that pollutants emission varies with the temperature.
A survey was carried out in 16 libraries in Modena University (Northern Italy) to assess the indoor exposure to Volatile Organic Compounds. VOCs were present in all the investigated libraries.The conclusion of that study is that no major problems were related to indoor pollution but the identification of the possible sources of contaminants is important, just as a definition of the relationship between indoor and outdoor levels of pollutants : that will take into account the effects of air recycling due to natural ventilation systems.
This paper proposes a space zone model for the calculation of all the airflow parameters based on tracer gas measurements, including flow rates of outdoor air, VAV supply. This approach gives a practical protocol for buildings managers to evaluate the performance of airside systems and determine air-conditioning and ventilation system performance parameters within acceptable errors.
The inhabitants of Central Europe spend more of their time indoors. And indoor pollutants often affect human health more than the outdoor pollutants. This study aims at analysing how the indoor size distributions of submicron and ultrafine particles depends on outdoor distributions.
In the absence of indoor sources, concentrations of particulates are lower than in outdoor concentrations.
An integrated IAQ model has been developed for prediction of Volatile Organic Compounds emission rate of building material and concentration distribution within a material.Experimental data have validated the model predictions. The results of the experiment tallied with the model predictions.
This paper is a review and an exploration of the literature on indoor air quality in schools and the reported health problems related to it.The aim of that review was to identify health symptoms the most commonly reported in schools ;then to sum-up the existing measurement data on ventilation rate, CO2 concentrations and VOCs and biological contaminants in schools ; then sto um-up the information that exists on causal relationship between pollutant exposures and health symptoms in shools.
Login