scholarly journals Assessment of organic compound exposures, thermal comfort parameters, and HVAC system-driven air exchange rates in public school portable classrooms in California

2003 ◽  
Author(s):  
Derek Garth Shendell
Keyword(s):  
Public School ◽  
Organic Compound ◽  
Exchange Rates ◽  
Thermal Comfort ◽  
Hvac System ◽  
Portable Classrooms ◽  
Comfort Parameters ◽  
Air Exchange

The impact of mechanical ventilation operation strategies on indoor CO2 concentration and air exchange rates in residential buildings

2020 ◽  
pp. 1420326X2096076
Author(s):  
Pedro F. Pereira ◽  
Nuno M. M. Ramos
Keyword(s):  
Mechanical Ventilation ◽  
Air Quality ◽  
Exchange Rates ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Residential Buildings ◽  
Ventilation Strategy ◽  
The Impact ◽  
Mechanical Extraction ◽  
Air Exchange

In Portugal, residential buildings commonly have their ventilation strategy changed after commissioning. This occurs due to the building managers' willingness to reduce shared costs with the electricity needed for fan operation. However, this option is not technically supported, and the effects of such a strategy on indoor air quality-related to human pollutants are yet to be quantified. CO2 was monitored in 15 bedrooms and air exchange rates were calculated for each room. The air exchange rate values ranged from 0.18 to 0.53 h−1 when mechanical extraction ventilation was off, and from 0.45 to 0.90 h−1 when mechanical extraction ventilation was on, which represents an average increase of 119%. With the current intermittent ventilation strategy, all rooms remain above 1500 ppm for a given percentage of time, and 12 rooms presenting CO2 concentrations above 2000 ppm. Simulations of theoretical CO2 concentrations, for a non-interrupted mechanical ventilation strategy show that no rooms would accumulate CO2 concentrations above 2000 ppm, and only 25% would present CO2 concentrations above 1500 ppm. Pearson correlations between the monitored CO2 and human and spatial factors identified two relevant parameters. Those parameters correspond to ratios between CO2 generation and floor area ([Formula: see text]), and airflow with CO2 generation ([Formula: see text]). The proposed ratios could be used as ways to optimise ventilation costs and indoor air quality.

Estimating residential air exchange rates in rural Bangladesh using a near field-far field model

2021 ◽  
pp. 108325
Author(s):  
Darpan Das ◽  
Emma Moynihan ◽  
Mark Nicas ◽  
Eric D. McCollum ◽  
Salahuddin Ahmed ◽  
...  
Keyword(s):  
Exchange Rates ◽  
Field Model ◽  
Near Field ◽  
Far Field ◽  
Rural Bangladesh ◽  
Air Exchange

Winter Measurements of Air Exchange Rates Using Tracer Gas Technique and Quantification of Gaseous Emissions from a Naturally Ventilated Dairy Barn

2011 ◽  
Vol 27 (6) ◽  
pp. 1015-1025 ◽  
Author(s):  
M. Samer ◽  
M. Fiedler ◽  
H.-J. Müller ◽  
M. Gläser ◽  
C. Ammon ◽  
...  
Keyword(s):  
Exchange Rates ◽  
Gaseous Emissions ◽  
Tracer Gas ◽  
Air Exchange

scholarly journals A trace gas technique for measuring clothing microclimate air exchange rates

1972 ◽  
Vol 29 (4) ◽  
pp. 378-386 ◽  
Author(s):  
G. W. Crockford ◽  
M. Crowder ◽  
S. P. Prestidge
Keyword(s):  
Exchange Rates ◽  
Trace Gas ◽  
Air Exchange
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