PREDICTION AND ITS VALIDATION ON VENTILATION RATE AND AUXILIARY FAN WORK OF A HYBRID VENTILATION SYSTEM WITH WIND FOR MULTIFAMILY DWELLINGS

Salt damage can affect the service life of numerous building structures, both historical and contemporary, in a significant way. Therefore, various conservation methods have been developed for the consolidation and protection of porous building materials exposed to the salt attack. As any successful treatment of salt damage requires a multidisciplinary attitude, many different factors such as salt solution transport and crystallization, presence and origin of salts in masonry, and salt-induced deterioration are to be taken into account. The importance of pre-treatment investigations is discussed as well; in a combination with the knowledge of salt and moisture transport mechanisms they can give useful indications regarding treatment options.Another important cause of building pathologies in buildings is the rising damp and this phenomenon it is particularly more severe with the presence of salts in water. The treatment of rising damp in historic building walls is a very complex procedure. At Laboratory of Building Physics (LFC-FEUP) a wall base hygro-regulated ventilation system was developed. This system patented, HUMIVENT, has been submitted to laboratorial monitoring and to in situ validation and a numerical simplified model was developed to facilitate the practical application. Having in mind the practical application of scientific and technological knowledge from Building Physics to practice, this paper presents the design of the system (geometry, ventilation rate and hygrothermal device), the detailing and technical specification of its different components and information about the implementation in three types of buildings: a church, a museum and a residential building.

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Exposure Assessment in Nail Salons: An Indoor Air Approach

ISRN Public Health ◽

10.5402/2012/962014 ◽

2012 ◽

Vol 2012 ◽

pp. 1-7 ◽

Cited By ~ 13

Author(s):

Cora Roelofs ◽

Tuan Do

Keyword(s):

Carbon Dioxide ◽

Exposure Assessment ◽

Indoor Air ◽

Ventilation System ◽

Ventilation Rate ◽

Self Report ◽

Adequate Ventilation ◽

The Common ◽

Traditional Approaches ◽

Nail Salons

Due to the complexity of the nail salon work environment, traditional approaches to exposure assessment in this context tend to mischaracterize potential hazards as nuisances. For this investigation, a workable “indoor air” approach was devised to characterize potential hazards and ventilation in Boston, Massachusetts area nail salons which are primarily owned and staffed by Vietnamese immigrants. A community-university partnership project recruited salons to participate in a short audit which included carbon dioxide measurements and evaluation of other air quality metrics. Twenty-two salons participated. Seventy-three percent of the salons had spot carbon dioxide measurements in excess of 700 ppm, the level corresponding to a ventilation rate recommended for beauty salons. Fourteen salons (64%) did not have a mechanical ventilation system to provide fresh air and/or exhaust contaminated air. The lack of adequate ventilation is of significant concern because of the presence of potentially hazardous chemicals in salon products and the common self-report of symptoms among nail technicians. Community and worker health may be improved through adoption of recommended ventilation guidelines and reduction in the hazard potential of nail products.

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Comparison of indoor air pollutants concentration in two Romanian classrooms

E3S Web of Conferences ◽

10.1051/e3sconf/20183201023 ◽

2018 ◽

Vol 32 ◽

pp. 01023

Author(s):

Vasilica Vasile ◽

Alina Dima ◽

Elena Zorila ◽

Andrei Istrate ◽

Tiberiu Catalina

Keyword(s):

High School ◽

Indoor Air Quality ◽

Indoor Air ◽

Air Pollutants ◽

Natural Ventilation ◽

Ventilation System ◽

Experimental Campaign ◽

Air Pollutions ◽

Hybrid Ventilation ◽

Indoor Air Pollutants

This paper investigates the air pollutions in space ventilated in two High School classrooms. The analysis consists of comparison of one classroom with hybrid ventilation system and another one stander-by classroom with natural ventilation. Several studies regarding indoor air quality during the experimental campaign have been done for VOC, CO2, CO, other pollutants, keeping monitored for humidity and temperature. The experimental demonstrated that the highest value for CO2 in stander-by classroom is 2691 ppm and in classroom with hybrid ventilation is 1897 ppm, while values for CO are 1.1 / 1.1 ppm and VOC 0.14 / 0.06 ppm, better use hybrid ventilation.

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