The goal of the present study was to examine the influence of CO2 concentration in the air ofindoor spaces on human well-being and intensity of mental work. Ten experimental subjectswere used in four experimental conditions with different CO2 concentrations (600, 1500,3000, 4000 ppm). Microclimatic parameters (CO2 concentration, temperature and relativehumidity of the air, surface temperature of walls) were measured.
The impact of dry indoor air on comfort and health in winter was investigated in a crossoverintervention study in two floors of an office building in northern Sweden. The indoor airhumidity (normally 10-20% RH) was raised to 23-24% RH, one floor at a time, using steamhumidifiers. Questionnaires and objective (clinical) measurements were applied.
Indoor air quality is one of the main factors, which affect indoor environment. Through analyzing indoor air quality (IAQ), 9 main factors have been established in this paper, such as temperature, wind speed and relative humidity, and so on. By the adaptive degree of humans physiology and psychology to indoor environment, IAQ is partitioned into 3 grades, that is comfortable, rather comfortable and uncomfortable. By above 3 grades, the limitation scopes of every grade of all factors are given, accordingly.
A 2 × 2 replicated field intervention experiment was conducted in a call-centre providing a national public telephone directory service: outdoor air supply rate was adjusted to be 8 or 80% of the total airflow of 430 l/s (3.5 h-1); and the supply air filt
The German Federal Environmental Agency has published a ‘mould guide’, which aims at harmonizing procedures to investigate and evaluate indoor mould contamination. The policy behind the guide is not to make a health assessment for every individual case ba
We conducted an epidemiological study to examine the associations between indoor climate and office workers’ health and working efficiency. We investigated four office buildings in Massachusetts, USA, beginning May 1997 over 1 year. Ninety-eight participa
A blind intervention study in which air temperature and the outside air supply rate were changed in a 2 × 2 design was carried out in a call centre in Singapore. The reported intensity of headache and difficulty in concentrating were reduced by 19.5% (P
Ozone concentrations were monitored up- and downstream of used filter samples at airflowsof 1.0 and 0.2 l s-1. The ozone concentration in the air upstream of the filters was ~75 ppb,while the concentration downstream of the filter was initially ~35% lower at 1 l s-1 and ~55%lower at 0.2 l s- 1. Within an hour the removal efficiency had decreased to roughly 5% at1 l s- 1 and 10% at 0.2 l s- 1. These filter samples were then placed in either nitrogen or ambientair for 48 h. Afterwards it was found that there was partial regeneration of the filters ozoneremoval capabilities.
This paper will review 6 years of experience in risk communication and meeting workplaceinformation needs about the health effects experienced by people working in sealed buildings.The purpose of this paper is to discuss examples of the kinds of information that theworkplace community is seeking and what answers can or cannot be provided.In the past two decades, there has been a growing concern about potential chronic healtheffects of poor indoor air quality and mould.
There are several factors that affect the hygiene in the surgical operating theatres. The HVACairside system plays an important role to maintain the adequate hygiene level in the operatingtheatres. The present paper displays comparisons between different HVAC airside designs toassess their impact on the surgery staff and patient health and comfort. The present workutilizes a numerical modelling technique to predict local flow field characteristics, heattransfer and air distribution profiles.
Login